Vietnam Journal of Catalysis and Adsorption

RESEARCH PAPER

Corrected Proofs

Sử dụng chất mang rắn tẩm chất lỏng ion aliquat cho quá trình thu hồi Pt từ dung dịch clorua
Using aliquat 336 impregnated solid carriers for platinum recovery from chloride solution

Uông Thị Ngọc Hà1,2,3, Bùi Thị Lệ Thủy4, Phạm Công Ngọc5, Nguyễn Khắc Duy4, Tăng Khắc Vinh6, Vũ Khắc Tuấn7, Nguyễn Văn Vinh4

1 Viện Công nghệ Hoá học, Viện Hàn lâm Khoa học và Công nghệ Việt Nam
2 Học viện Khoa học và Công nghệ, Viện Hàn lâm Khoa học và Công nghệ Việt Nam
3 Đại học Y Dược TPHCM
4 Đại học Mỏ Địa chất
5 Trường THPT chuyên ĐH Sư Phạm Hà Nội
6 Trường THPT chuyên Lê Hồng Phong, TP. Hồ Chí Minh
7 Công ty TNHH Samsung Display Việt Nam, Khu Công nghiệp Yên Phong, Bắc Ninh, Việt Nam.

ABSTRACT
Six sorbents formed by impregating ionic liquid (IL) aliquat 336 on different solid carriers such as SiO2-100, SiO2-60, Al2O3, Al-HMS, and amberlite XAD-4 and amberlite XAD-7 exchange resins were used to recover platinum from chloride solution with high yield (over 99%). The influence of some factors such as structure of solid carriers, the content of ionic liquid loading (% pore volume), and molar ratio IL/Pt on platin sorption was investigated. The Pt recovery yield reached 96% when molar ratio of IL to platinum of 10 and IL loading of 20% pore volume. The sorption capacity of sorbents with different VIL/Vpor ratio and IL/Pt ratio was also investigated. The results of investigation of influence of some factors and of maximum sorption capacity show that the molar ratio of IL to platinum of 10-10.5 and VIL/Vpor ratio of 50% should be used for Pt recovery process from chloride solution.

RESEARCH PAPER

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Khảo sát cấu trúc và tính chất phân tử của 2,4,4’-triclobiphenyl & các sản phẩm hydrodeclo hóa bằng phương pháp phiếm hàm mật độ
Molecular structures and properties of 2,4,4’-trichlorobiphenyl & its hydrodechlorination products: density functional theory calculations

Nguyễn Quang Thắng1,2, Nguyễn Thị Phương2, Đinh Văn Thức2, Trần Đức Hùng2, Nguyễn Trọng Nghĩa3This email address is being protected from spambots. You need JavaScript enabled to view it., Nguyễn Hồng Liên3

1 Viện Công nghệ mới, Viện Khoa học và Công nghệ Quân sự
2 Viện Hóa học Môi trường quân sự - Binh chủng Hóa học
3 Viện Kỹ thuật Hóa học - Trường ĐHBK Hà Nội

ABSTRACT
Polychlorinated biphenyls (PCBs) are in a toxic group chemical for health and environmental. The structural parameters and molecular properties of PCB-28 and its hydrodechlorination products in gas phase and solvent including toluene, acetone, ethanol, methanol were investigated by the quantum computational method at B3LYP/6-31+G(d) level of theory. The DFT results show that the solvent polarity has an effect on structural parameters and molecular properties. When dielectric constant of solution increase, the C-Cl bond lengths, muliken charges of C atom in the C-Cl bond increase; while C-Cl vibrational frequencies, molecule energies, muliken charges of Cl atom decrease. The results may be usedful for theoretical and experiemental studies of PCB hydrodechlorination reaction.

RESEARCH PAPER

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Nghiên cứu tính chất và khả năng khử O2 của hệ màng đơn lớp hai cấu tử porphyrin trên bề mặt đơn tinh thể Cu(100)
Study on properties and oxygen electroreduction of self-assembled binary monolayer of porphyrins deposited on single crystalline Cu(100)

Nguyễn Phi Hùng1This email address is being protected from spambots. You need JavaScript enabled to view it., Huỳnh Thị Tuyết Nhung2, Nguyễn Lê Tuấn2, Phan Thanh Hải2, và Huỳnh Thị Miền Trung2This email address is being protected from spambots. You need JavaScript enabled to view it.

1 Viện Khoa học giáo dục , Trường Đại học Quy Nhơn, 170 An Dương Vương, TP. Quy Nhơn, Bình Định
2 Khoa Khoa học tự nhiên, Trường Đại học Quy Nhơn, 170 An Dương Vương, TP. Quy Nhơn, Bình Định

ABSTRACT
A combination of cyclic voltammetry (CV), linear sweep voltammetry (LSV) and in-situ electrochemical scanning tunneling microscopy (EC-STM) was employed to characterize the electrochemical response, morphology and surface structure at the molecular level as well as the electrocatalytic activity of self-assembled binary monolayer of two different porphyrin molecules electrodeposited on Cu(100) electrode. Individual phorphyrin compound locates in separated domains. The mixed domain of both was not observed. Based on the LSV results, this self-assembled binary monolayer enables enhancement the oxygen electroreduction to hydro peroxide (H2O2). This finding opens a new avenue to improve the efficiency of the oxygen electroreduction making use such binary organic molecular self-assemblies.

RESEARCH PAPER

Corrected Proofs

Nghiên cứu hoạt tính của chất xúc tác Co/Al-MCM-41 cho phản ứng chuyển hóa hydropolymer hóa ethylene
The catalytic activity of Co/Al-MCM-41 catalyst for conversion of ethylene–hydropolymerization

Trương Quốc Hưng1This email address is being protected from spambots. You need JavaScript enabled to view it., Nguyễn Quang Minh2, Đào Quốc Tùy2

1 Khoa Kỹ Thuật Tổng hợp - Trường Cao Đẳng kỹ nghệ Dung Quất
2 Bộ Môn Công Nghệ Hữu cơ – Hóa dầu, Viện Kỹ thuật Hóa học - Trường Đại Học Bách Khoa Hà Nội

ABSTRACT
In this paper, MCM-41 modified by Al was used as supporter to investigate the conversion of ethylene – hydropolymerization into liquid fuel in the presence of synthetic gas (CO and H2). The catalyst samples contain Co: 5%Co/Al-MCM-41, 7.5%Co/Al-MCM-41, 10%Co/Al-MCM-41 were designed as: 5CAM, 7.5CAM 10CAM, respectively. All the catalysts wrere exposed under certain proportion of C2H4/CO/H2 at mild condition (190 °C and atmospheric pressure). The results show that, liquid hydrocarbons were formed in the naphtha, kerosel and diesel fractions for all 3 catalysts (5, 7.5 and 10CAM). Amazingly, the formation of some alcohol, ring-compounds was observed for 7.5CAM.

RESEARCH PAPER

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Nghiên cứu động học hấp phụ Pb(II) trong dung dịch nước của vật liệu cacbon nano ống biến tính bằng phương pháp oxi hóa

Nguyễn Đức Vũ Quyên1This email address is being protected from spambots. You need JavaScript enabled to view it., Trần Ngọc Tuyền1, Hồ Văn Minh Hải1, Đặng Xuân Tín1, Bùi Thị Hoàng Diễm1, Hồ Thị Thùy Dung2

1 Khoa Hóa, Trường Đại học Khoa học, Đại học Huế
2 Trường Cao đẳng Y tế Huế 

ABSTRACT
In the present study, the carbon nanotubes (CNTs) modified by the oxidation are used as Pb(II) adsorbent from aqueous solution with the oxidant of the mixture containing nitric and sulfuric acids. Pb(II) adsorption ability of modified CNTs (ox-CNTs) is investigated at different temperatures with different initial concentrations of Pb(II). The adsorption reaches equilibrium state after 80 min. Effects of pH and adsorbent dosage to Pb(II) removal are surveyed. Chemisorption nature is proved and well described by pseudo-second-order kinetic model. Low activation energy of Pb(II) adsorption implies that the adsorption quickly occurs and is a diffusion-controlled process. Ion exchange mechanism of Pb(II) sorption onto ox-CNTs is clarified.

RESEARCH PAPER

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Ảnh hưởng của lượng nguồn cacbon đến cấu trúc và tính chất hấp phụ xanh metylen của vật liệu cacbon mao quản trung bình được tổng hợp bằng phương pháp khuôn mẫu cứng
Effects of amount of carbon source on structure and methylene blue adsorption of the mesoporous carbon materials synthesized by hard template method

Nguyễn Thị Hồng Hoa1This email address is being protected from spambots. You need JavaScript enabled to view it., Đặng Tuyết Phương2

1 Đại học Khoa Học – Đại học Thái Nguyên
2 Viện Hóa học, Viện KH&CN Việt Nam

ABSTRACT
In this work, mesoporous carbon materials have been synthesized by hard template method using mesoporous silica SBA-15 as templates, sucrose as carbon source with different number of impregnation. The synthesized materials were characterized by XRD and N2 sorption – desorption methods. The obtained results indicated that synthesized carbon material with two of impregnation has the highest surface area (1126 m2/g), largest pore volume (1.31 cm3/g) and highest methylene blue adsorption capacity (155.53 mg/g).

RESEARCH PAPER

Corrected Proofs

Ảnh hưởng của tỉ lệ khối lượng đến hoạt tính quang xúc tác của composite g-C3N4/ZnS
Influence of weight ratio to the photocatalytic actvity of g-C3N4/ZnS composite

Nguyễn Thị Việt Nga1, Nguyễn Văn Kim2This email address is being protected from spambots. You need JavaScript enabled to view it.

1 Khoa Sư phạm, Trường Đai học Quy Nhơn
2 Khoa Tự nhiên, Trường Đai học Quy Nhơn

ABSTRACT
The g-C3N4/ZnS composites materials were synthesized by amounts of g‐C3N4 and ZnS and dispersed in water under stirring for 48 hour. The final product was gathered using a centrifuge, washed with absolute ethanol and ultra‐pure water several times, and then dried in a vacuum oven at 70 °C. The as-prepared samples were denoted as g-C3N4/ZnS-w, where w is weight ratio of ZnS:g-C3N4 and equals 1, 1.5 and 2. The obtained materials were characterized by X-Ray Diffraction (XRD), Energy-dispersive X-ray (EDX) and Ultraviolet–Visible Diffuse Reflectance Spectroscopy (UV-Vis-DRS). The photocatalytic activity of g-C3N4/ZnS-w samples was assessed by degradation of methylene blue in aqueous solution under visible light. Among them, g-C3N4/ZnS-1.5 exhibited the best performance. The mechanism of decomposition of methylene blue was studied by using quenchers, which demonstrated that hydroxyl radicals (OH) are the main factors of the photocatalytic process. Effect of initial pH was also investigated.

RESEARCH PAPER

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Nghiên cứu tổng hợp g-C3N4 pha tạp oxy dùng làm chất xúc tác quang
Study on synthesis of oxygen-doped g-C3N4 as a photocatalyst

Nguyễn Phạm Chí Thành1, Trần Doãn An1, Nguyễn Văn Phúc2, Nguyễn Tấn Lâm1, Hồ Văn Ban1, Nguyễn Phi Hùng1, Võ Viễn1,2This email address is being protected from spambots. You need JavaScript enabled to view it.

1 Khoa Hóa, Trường Đại học Quy Nhơn,
2 Viện nghiên cứu ứng dụng khoa học và công nghệ, Trường Đại học Quy Nhơn.

ABSTRACT
As a fascinating conjugated polymer, graphitic carbon nitride (g-C3N4) has attracted much attention as a metal-free and visible-light-responsive photocatalyst in the energy and environmental application. However, pure g-C3N4 performs a poor photocatalytic activity since various limitations, such as fast recombination rate of photo-induced charge carriers, weak visible light harvesting as well as low specific area study. This study reports on the modification of g-C3N4 by O-doping, in which, the materials were prepared by heating urea (treated previously by H2O2) at 550 ºC for 1h, which were denoted as x-OCN where x is the volume (mL) of H2O2 (30% solution) per 10 g urea (x = 20, 40, 60 ). The obtained materials were characterized by IR, XRD, UV-Vis DRS, XPS and SEM, which demonstrated that oxygen-doped g-C3N4 has been successfully synthesized. Photocatalytic activity of g-C3N4 and x-OCN was assessed by the degradation of Rhodamine B (RhB) in visible light range. Among the x-OCN samples, 40-OCN is the best one with efficiency of 94%, 1.77 times higher than pure g-C3N4.

RESEARCH PAPER

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Nghiên cứu lựa chọn chu trình hấp phụ thay đổi áp suất (PSA) 4 bước và 6 bước cho thiết bị tạo khí N2.
A study on the selection of the effective cycle base on 4 – step and 6 – step pressure swing adsorption processes for nitrogen gas production

Phạm Văn Chính1, Lê Quang Tuấn1, Nguyễn Tuấn Hiếu2, Vũ Đình Tiến3This email address is being protected from spambots. You need JavaScript enabled to view it.

1 Viện Hóa học Vật liệu, Viện KH&CN quân sự 
2 Viện Công nghệ, TCCNQP 
3 Trường Đại học Bách khoa Hà Nội

ABSTRACT
Pressure swing adsorption (PSA) is a technology used to separate some gas species from a mixture of gases under pressure according to the species’ molecular characteristics and affinity for an adsorbent material. It is mainly used in chemical and petrochemical processes as well as the steel industry, for example to recover hydrogen (H2) from coking or conversion gases, or to separate oxygen (O2) and nitrogen (N2) from air. The choice of a suitable operating cycle is in fact critical, and a wide range of different cycles have been proposed to optimize different aspects of overall process. The 6-step cycle was selected on the basis of a study comparing two popular cycles of Skarstrom and Berlin by experiment on the nitrogen gas generator. This pilot system was researched, fabricated and installed at Institute of Technology - The General Department of Defense Industry - Vietnam for simulation, optimization and scale up.

RESEARCH PAPER

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Tổng hợp vật liệu từ tính bằng phương pháp thủy nhiệt từ nguồn thải rơm rạ ứng dụng xử lý thuốc nhuộm xanh methylen
Synthesis of magnetic material derived from rice straw by hydrothermal carbonization for removal of methylene blue

Nguyễn Ngọc Bích1,3This email address is being protected from spambots. You need JavaScript enabled to view it., Nguyễn Đình Thành2,3

1 Trung tâm Phân tích Hóa học, Đại học Đồng Tháp
2 Viện Khoa học Vật liệu Ứng dụng Thành phố Hồ Chí Minh, Viện Hàn lâm Khoa học và Công nghệ Việt Nam
3 Học viện Khoa học và Công nghệ, Viện Hàn lâm Khoa học và Công nghệ Việt Nam

ABSTRACT
Rice straw, an agricultural waste, was successfully converted into novel magnetic carbon composites by low temperature hydrothermal carbonization. Firstly, rice straw (RS) is pretreated with KOH aqueous solution in stainless-steel autoclave that was Teflon lined and heated at 120 °C for 4 h, the resulting liquid is used to synthesize a black liquor-derived porous carbon. Then, magnetic carbon (MC) is carbonized at 180 °C for 14 h by the hydrothermal method. The obtained samples had a high magnetization (28,1 emu/g) and good adsorption capacity for methylene blue (MB) (qmax = 104,17 mg/g), which promised to become a potential adsorbent.

RESEARCH PAPER

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Nghiên cứu quá trình hấp phụ của một cột sử dụng vật liệu hấp phụ sàng phân tử các bon CMS-240 để tách khí nitơ
Study the adsorption process of a column using CMS-240 carbon molecular sieves adsorbent for nitrogen gas separation
Phạm Văn Chính1, Lê Quang Tuấn2, Nguyễn Tuấn Hiếu3, Vũ Đình Tiến4This email address is being protected from spambots. You need JavaScript enabled to view it.

1 Viện Hóa học Vật liệu, Viện KH&CN quân sự
2 Viện Hóa học Vật liệu, Viện KH&QS
3 Viện Công nghệ, TCCNQP
4 Trường Đại học Bách khoa Hà Nội

ABSTRACT
The component of carbon molecular sieve (CMS) is carbon. CMS takes the appearance of cylindrical black solid, contains countless 4 angstrom fine pores, it can be used to separate air into nitrogen and oxygen. In industry, CMS can concentrate nitrogen from air with PSA systems. CMS products have the character of large nitrogen yield capacity; high nitrogen recovery. It can meet the requirement of all types of PSA nitrogen systems. This paper describes the results of the study the carbon molecular sieves CMS-240 and the adsorption process of a adsorption column in nitrogen gas generator using pressure swing adsorption. This equipment was fabricated and installed at Institute of Technology of the General Department of Defense Industry for simulation and optimization research.

RESEARCH PAPER

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Nghiên cứu ảnh hưởng của dạng ion bù trừ điện tích khung mạng đến khả năng giữ axit 12- phosphotungstic trên vật liệu Al-SBA-15 và ứng dụng làm xúc tác cho phản ứng tổng hợp chất tạo hương Fructon.
Study the effect of framework compensation ion type on 12-phosphotungstic acid immobilizability over Al-SBA-15 and its application in Fructone fragrancy synthesis

Do Van Cuong1, Truong Thi Hanh2, Do Ngoc Mai1, Nguyen Thi Nhiem1, Doan Thi Hai1, Le Thi Hoai Nam1 and Tran Quang Vinh1,3,This email address is being protected from spambots. You need JavaScript enabled to view it.

1 Viện Hóa học, Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 18 Hoàng Quốc Việt, Cầu Giấy, Hà Nội, Việt Nam
2 Đại học Hàng Hải Việt Nam, 484 Lạch Tray, Lê Chân, Hải Phòng, Việt Nam
3 Học viện Khoa học và Công nghệ, 18 Hoàng Quốc Việt, Cầu Giấy, Hà Nội, Việt Nam

ABSTRACT
12-phosphotungstic acid (HPA) heterogeneous catalyst was immobilized on Al-SBA-15 support over different compensation ions (NH4+ and Cs+) created by ion-exchange method. The presence, content of HPA and its effect on the support structure were characterized by EDX, FTIR, XRD, BET and TPD-NH3 methods. The results showed that HPA could be immobilized on Al-SBA-15 support up to 24.28 wt.% over NH4+ and 23.16 wt.% over Cs+. Both HPA/Al-SBA-15 catalysts showed very high acidity. By using Cs+, HPA could be immobilized better than by using NH4+ via the left HPA content inconsiderably decreased after five washing times with ethanol-water mixture. In Fructone synthesis, both catalysts showed high catalytic activity with high ethyl acetoacetate conversion. Moreover, HPA/Al-SBA-15 catalysts showed good catalytic stability after five reaction cycles with slightly decreasing of activity. Especially, the HPA/Al-SBA-15 in which HPA was immobilized over Cs+ ion showed better catalytic stability in comparison to that over NH4+ ion.

RESEARCH PAPER

Corrected Proofs

Nghiên cứu chế tạo vật liệu MIL-53(Fe)@TiO2 ứng dụng xử lý nước thải dệt nhuộm
Study on MIL-53(Fe)@TiO2 process to treat wastewater of dyes

Nguyễn Thị Hoài PhươngThis email address is being protected from spambots. You need JavaScript enabled to view it., Trương Ngọc Tuấn, Trần Văn Chinh

Viện Hóa học - Vật liệu, 17 Hoàng Sâm, Nghĩa Đô, Cầu Giấy, Hà Nội

ABSTRACT
In this study, iron benzenedicarboxylate framework@titanium dioxide (MIL-53(Fe)@TiO2) composites have been synthesized from precursors of ilmenite. As-prepared composite materials were characterized by XRD, SEM, EDX and TGA techniques, UV-VIS Diffuse Reflectance. 

RESEARCH PAPER

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Công nghệ chế tạo vật liệu mang năng lượng dùng làm liều phóng đạn cao xạ 23mm kiểu ZU-23
Manufacturing technology of energy materials used in the charge of 23mm ammunition weapon type ZU-23

Phạm Quang Hiếu1This email address is being protected from spambots. You need JavaScript enabled to view it., Phạm Văn Toại1, Chu Chiến Hữu2, Nguyễn Ngọc Hải1, Bùi Anh Thức1, Nguyễn Minh Tuấn1, Phạm Kim Đạo1

1Viện Thuốc phóng Thuốc nổ, Tổng cục Công nghiệp Quốc phòng,192 Đức Giang, Long Biên, Hà Nội
2 Viện Hóa Học Vật liệu, Viện KH&CN Quân sự

ABSTRACT
Now, with the development of domestic military science in our country, many high-energy materials such as propellants have been stably produced, some of our special propellant still need to be imported abroad. Including propellant 5/7SFL for the 23 mm artillery cartridge ZU-23, this is a phlegmatized propellant. In this article, the authors will present the technology for the production of semi-finished propellants (before phlegmatization) on the Z production line and this domestic domestication technology, which will make it possible to discharge for the 23-mm cartridge mentioned above.

RESEARCH PAPER

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Chế tạo và xác định các đặc trưng nano perovskit LaFe1-xMnxO3 (0≤ x ≤1) làm vật liệu hấp phụ xử lý ô nhiễm môi trường nước
Preparation and characterization of LaFe1-xMnxO3 perovskites (0≤ x ≤1) nano scale as an adsorbent to treat water pollution

Vũ Thế NinhThis email address is being protected from spambots. You need JavaScript enabled to view it., Phạm Ngọc Chức, Lưu Minh Đại

Viện Khoa học vật liệu, Viện Hàn lâm Khoa học và Công nghệ Việt Nam

ABSTRACT
The nanoparticle crystals of perovskite oxides LaFe1-xMnxO3 was prepared by the PVA (polyvinyl alcohol) gel combustion method to determine the adsorption capacity of Pb2+, Cd2+, Fe3+ ions from solution was investigated. Characteristics of fabrication materials are determined by the X-ray diffraction (XRD), scanning electron microscopy (SEM) and Brunaure-Emmet-Teller (BET), vibration sampling magnetometer (VSM), point of zero charge (PPZC) measurements. The results showed that the single crystalline form of perovskite oxides LaFe1-xMnxO3 was formed by the formation of a solid solution between perovskite LaFeO3 and perovskite LaMnO3 with all x (0 ≤ x ≤ 1) values. The results of the adsorption capacity show that the perovskite with the formula LaFe0.7Mn0.3O3 gives the best performance for Pb2+ ions and the perovskite with the formula LaFe0.7Mn0.3O3 gives the best performance for Cd2+, Fe3+ ions. The values saturation magnetization of LaFe1-xMnxO3 perovskite from 6.5 emu.g-1 to 12.0 emu.g-1.

RESEARCH PAPER

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Adsorption characteristics of tryptophan onto nanosilica synthesized from rice husk

Thi Sim Hoang1, Thu Thuy Bui1, Thi Dung Le2, Tien Duc Pham1,This email address is being protected from spambots. You need JavaScript enabled to view it.

1 Faculty of Chemistry, VNU – University of Science, Vietnam National University – Hanoi, 19 Le Thanh Tong, Hoan Kiem, Hanoi, Vietnam
2 Basic Science Faculty- College of Artillery Officer Training, Thanh Mi, Son Tay, Hanoi, Vietnam

ABSTRACT
The present study investigated adsorption of amino acid Tryptophan (Trp) on nanosilica (SiO2). Nanosilica which was successfully synthesized from rice husk, was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Transmission electron microscopy (TEM), and zeta potential measurements. Some effective conditions affect to the adsorption of Trp onto nanosilica such as pH, ionic strength, adsorbent dosage, adsorption time were systematically studied. Adsorption of Trp onto nanosilica increased with increasing pH because the higher negatively charged SiO2 surface is obtained at high pH. Maximum adsorption capacities of Trp onto nanosilica were achieved with adsorption time 180 min, pH 10 and adsorbent dosage 10 mg/mL and ionic strength 50 mM KCl. Adsorption of Trp onto nanosilica increased with increasing salt from 0 to 50 mM KCl. Nevertheless, adsorption of Trp was independent on the ionic strength at higher than 50 mM KCl. Based on the change in surface charge by zeta potential measurement and adsorption kinetics, we confirm that the adsorption of Trp on nanosilica was controlled by both electrostatic and non-electrostatic interactions.

RESEARCH PAPER

Corrected Proofs

Góp phần nghiên cứu sự phân hủy axit oxalic sử dụng quang xúc tác TiO2
Contributing to the study of oxalic acid degradation using TiO2 photocatalyst

Phan Thị Hương Quỳnh1, Nguyễn Thị Thảo1, Trịnh Thị Huyền Trang1, Phạm Đức Chinh1This email address is being protected from spambots. You need JavaScript enabled to view it., Nguyễn Thị Thu Trang2, Nguyễn Minh Tân1

1 Viện nghiên cứu và ứng dụng phát triển các hợp chất thiên nhiên (INAPRO), Trường Đại học Bách khoa Hà Nội
2 Viện Công nghệ môi trường, Viện Hàn lâm Khoa học và Công nghệ Việt Nam

ABSTRACT
This study focused on studying the effect of catalytic concentration and UV intensity on oxalic acid decomposition by by photocatalyst using TiO2. Langmuir-Hinshelwood kinetic model was used to monitor the rate of degradation of oxalic acid by TiO2 and UV. The results showed that when conducting the reaction to decompose oxalic acid at 25 °C; 0.5 g/l TiO2 concentration and UV intensity of 100 W/m2, the apparent reaction rate constant kapp= 0.025 minutes-1.

RESEARCH PAPER

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Tổng hợp nanocomposite γ-Fe2O3@HAp-CD bằng phương pháp xanh và đánh giá hoạt tính xúc tác cho quá trình tổng hợp dẫn xuất phenacyl
Green synthesis of γ-Fe2O3@HAp-CD nanocomposite and its application for the synthesis of phenacyl derivatives

Phạm Xuân Núi1This email address is being protected from spambots. You need JavaScript enabled to view it., Nguyễn Thị Hoa1, Phạm Thị Ngân1, Phạm Đức Trọng1, Nguyễn Thị Phương Lan2, Ngô Hà Sơn1

1 Trường Đại học Mỏ - Địa chất
2 Khoa Khoa học cơ bản, Trường Đại học Kinh tế Kỹ thuật Công nghiệp

ABSTRACT
Nano-hydroxyapatite (HAp) is being widely investigated for various applications in medical engineering and nanocomposite for transformation reaction. The present work describes an efficient procedure for the synthesis of phenacyl derivatives employing a novel, green and magnetically retrievable nanocomposite via the grafting of β-cyclodextrin moieties on the magnetic hydroxyapatite surface, γ-Fe2O3@HAp-CD. The structure and composition of nanocomposite were performed by different method and analyzed by Infrared Spectroscopy (FT-IR), Field Emission Scanning Electron Microscopy (FE-SEM), X-ray Diffraction (XRD) and Vibrating Sample Magnetometery (VSM). Our results indicate that conjugation with β-CD improves the catalytic activity for the synthesis of phenacyl derivatives.

RESEARCH PAPER

Corrected Proofs

Nghiên cứu tổng hợp xúc tác đa oxit (Cu-Mn) mang trên chất mang alumin monolith bằng phương pháp plasma corona ứng dụng cho phản ứng oxi hoá CO tại nhiệt độ thấp
Preparation of multi-oxide (Cu-Mn) supported on alumina monolith catalyst by corona plasma method for CO oxidation reaction at low temperature

Bùi Bằng Việt1This email address is being protected from spambots. You need JavaScript enabled to view it., Nguyễn Võ Kỳ Duyên1,2, Phạm Hữu Thiện1

1 Viện Khoa học Vật liệu Ứng dụng - Viện Hàn lâm Khoa học và Công nghệ Việt Nam, 1A Thạnh Lộc 29, Phường Thạnh Lộc, Quận 12, Hồ Chí Minh
2 Học viện Khoa học và Công nghệ, 18 Hoàng Quốc Việt, Nghĩa Đô, Cầu Giấy, Hà Nội

ABSTRACT
In this study, multi-oxide catalysts (Cu-Mn) were prepared by corona plasma and wet impregnation methods. Characteristics of catalysts are determined by modern physicochemical methods such as: Infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermal analysis by thermal weighing (TGA - Thermogravimetric Analysis), observing the surface with transmission electron microscopy (TEM). All catalysts are determined to be active for the treatment of emissions through the oxidation of CO in the gas phase. The results showed that the use of corona plasma method for smaller particle size, uniform dispersion and higher specific surface area when compared with the wet impregnation methods. The activity of catalyst prepared by corona plasma method is also 20-25% higher than wet impregnation method.

RESEARCH PAPER

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Tổng hợp vật liệu quang xúc tác Al-MCM-41 chứa titanium cho phản ứng chuyển hóa dibenzothiophene trong nhiên liệu
Synthesis of photocatalytic material of Al-MCM-41 containg titanium and its application for conversion of dibenzothiophene from model fuel

Trần Thị Hoa1,2This email address is being protected from spambots. You need JavaScript enabled to view it., Phạm Xuân Núi3, Nguyễn Bá Mạnh4, Đặng Tuyết Phương4

1 Học viện Khoa học và Công Nghệ, Viện Hàn lâm Khoa học và Công nghệ Việt Nam
2 Trường Đại học Công nghiệp Việt Trì
3 Trường Đại học Mỏ - Địa chất, 18-Phố Viên, Phường Đức Thắng, Bắc Từ Liêm, Hà Nội
4 Viện Hóa học, Viện Hàn lâm Khoa học và Công nghệ Việt Nam
 
ABSTRACT
Mesoporous TiO2/MCM-41 nanocomposites were synthesized successfully by combining the sol-gel method and hydrothermal treatment, using titanium isopropoxide (TTIP) and Di Linh bentonite as precursors of Ti and Si, respectively. The synthesized materials were well characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), UV-visible diffuse reflectance spectroscopy (UV-Vis/DRS). The photocatalytic activity was evaluated by the photodegradation of dibenzothiophene (DBT) under both UV. TiO2/MCM-41 catalyst exhibited high catalytic activity for the oxidative desulfurization (ODS) of DBT reaching 89.16% conversions at 70 °C after 5  h under UV. The significant enhanced degradation of DBT over TiO2/Al-MCM-41 might be due to the synergy effects of high surface area of Al-MCM-41, well-distributed TiO2 anatase, and reduced electron-hole recombination rates due to the dispersion of Al-MCM-41.

RESEARCH PAPER

Corrected Proofs

Nghiên cứu chế tạo vật liệu lai porphyrin@TiO2-graphen và ứng dụng làm chất xúc tác quang cho phân hủy phẩm màu công nghiệp
Fabrication of porphyrin@TiO2-graphen hybrid materials and investigation of photocatalytical behavior toward RhB degradation

Bạch Xuân Hiếu1, Trương Ngọc Tuấn2, Lê Hải Khoa3, Nguyễn Thị Hoài Phương2, Nguyễn Thị Hồng Phượng1, Đặng Trung Dũng1, Trần Xuân Tùng4, Trần Văn Chinh2, Lã Đức Dương2,This email address is being protected from spambots. You need JavaScript enabled to view it.

1 Viện Kỹ Thuật Hóa học, Đại học Bách Khoa Hà Nội
2 Viện Hóa học - Vật liệu, Viện Khoa học và Công nghệ Quân sự
3 Viện Kỹ thuật nhiệt đới, Viện Hàn Lâm Khoa học và Công nghệ Việt Nam.
4 Hanoi Amsterdam high school

ABSTRACT
Quá trình chế tạo vật liệu cấu trúc nano porphyrin@TiO2-graphen được thực hiện theo phương pháp tự tổng hợp với sự có mặt của chất hoạt động bề mặt. Cấu trúc nano của vật liệu thu được đã được khảo sát bằng các kỹ thuật phân tích phổ UV-VIS, phổ nhiễu xạ tia X và SEM. Vật liệu tổ hợp porphyrin@TiO2-graphen bao gồm sự phân bố đồng đều của các hạt TiO2 với kích thước 15-30 nm và các thanh nano porphyrin kết tụ có chiều rộng 50-60 nm và chiều dài khoảng vài trăm nm trên bề mặt của graphen. Ứng dụng của vật liệu tổ hợp 3 thành phần cấu trúc nano porphyrin@TiO2-graphen trong quá trình quang xúc tác phân hủy chất ô nhiễm Rhodamin B đã được báo cáo, trong đó TiO2 và các khóm kết tụ porphyrin đã lần lượt thể hiển hoạt tính trong vùng ánh sáng UV và vùng ánh sáng khả kiến và kêt quả thu được vật liệu tổ hợp với hoạt tính cao. Cơ chế quang xúc tác có thể của quá trình quang xúc tác phân hủy RhB bằng vật liệu porphyrin@TiO2-graphen cũng đã được thảo luận.

RESEARCH PAPER

Corrected Proofs

Tổng hợp và đánh giá tính chất của hỗn hợp bột xúc tác IrxRu(1-x)O2 bằng phương pháp Adam cho phản ứng thoát ôxy trong điện phân nước màng trao đổi proton
Synthesis and characterization of IrxRu(1-x)O2 mixed nanocatalysts for the oxygen evolution reaction in PEM water electrolysis by Adam method

Phạm Hồng HạnhThis email address is being protected from spambots. You need JavaScript enabled to view it., Đỗ Chí Linh, Phạm Thi San, Nguyễn Ngọc Phong
Viện Khoa học vật liệu, Viện Hàn Lâm Khoa học và Công nghệ Việt Nam

ABSTRACT
Developing anodic material has been played an important role in PEMWE technology. In this study, we report characterization of mixed metallic oxides with different composition IrxRu(1−x)O2 (x = 1, 0.9, 0.8, 0.7, 0.6, 0.5 and 0) synthesized by the Adams method as anodic electrocatalysts for PEMWE. The mechanisms of the thermal decomposition process of precursors to form mixed metallic oxide powders were studied by means of thermal gravity analysis (TGA), X-ray diffraction (XRD) while transmission electron microscopy (TEM) were used to evaluate the crystallographic structure, morphology and size of catalyst particles. The surface reactivity and stability of these oxides was investigated by electrochemical methods including cyclic voltammetry (CV) and anodic polarization in solution of 0.5 M H2SO4. Based on the given results, the IrxRu(1−x)O2 (x = 0.7) compound was found to be more active than pure IrO2, more stable than pure RuO2. With an Ir0.7Ru0.3O2 anode (the total noble metal loading of 4 mg.cm-2) and a 20% Pt/C cathode (the total noble metal loading of 1 mg.cm-2), the potential of water electrolysis was 1.618 V at 1 A.cm-2.

RESEARCH PAPER

Corrected Proofs

Tổng hợp và đánh giá đặc trưng cấu trúc vật liệu graphitic carbon nitride g-C3N4

Đinh Thị Thúy Hằng1,2, Nguyễn Thị Thu1, Nguyễn Thị Ngọc Quỳnh3, Nguyễn Minh Phương1, Lê Thanh Sơn1, Nguyễn Đình Bảng1, Nguyễn Thanh Bình1This email address is being protected from spambots. You need JavaScript enabled to view it.

Trường Đại học Khoa học Tư nhiên, Đại học Quốc gia Hà Nội
2 Trường Đại học Hàng Hải Việt Nam
Trường Đại học Công nghiệp Việt Trì

ABSTRACT
The carbon graphitic nitride was synthesized at different temperature, in the range of 450-650°C. All obtained materials were characterized by diffraction of X-Ray (XRD), Infrared spectrometry (IR), Ultraviolet-Visible diffusive reflectance (UV-DRS). The XRD and IR results showed the formation of g-C3N4 phase only form 500°C to 650°C. At higher temperature calcinations, the g-C3N4 decomposed in gases. The UV-DRS spectra indicated the reduce of band gapenergy, from 2.75 to 2.54 eV, when increasing the temperature calcination. The catalytic test evaluation was carried out by degradation of Methylen blue (MB) and Rhodamin B (RhB).The obtained results showed the best degradation yield of MB on g-C3N4 550 (84.2%) and the one of RhB on g-C3N4 600 (~100%).

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