Vietnam Journal of Catalysis and Adsorption

Tổng hợp chất hoạt động bề mặt không ion alkanolamide từ dầu ăn đã qua sử dụng 
Synthesis of alkanolamide nonionic surfactant using used cooking oil

Trần Thị Thanh Ngọc¹, Nguyễn Thanh Nhật², Bùi Tấn Nghĩa^{3 This email address is being protected from spambots. You need JavaScript enabled to view it.}

ABSTRACT

In this paper, alkanolamide nonionic surfactants were achieved by amidation of the methyl esters with ethanolamine at 140 ℃, in 2 h in which methyl esters were synthesized by alkali catalyzed transesterification of the waste cooking oil, using methanol to oil molar ratio of 6:1. Additionally, to enhance surface-active property of the surfactants, C=C couple bonds in long chain alkyl of methyl esters were epoxidized by HCOOH/H₂O₂ before amidation. The obtained surfactants were characterized by Fourier transform infrared (FT-IR) and nuclear magnetic resonance (NMR). Furthermore, properties of the surfactants including surface tension, foamability and emulsifying power were also investigated. The results of this study showed that the waste cooking oil can be a potential source of cheap and suitable raw material for synthesis of surfactants.

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Chế tạo than sinh học từ bã mía và răm mảnh vụn gỗ keo dùng cho tổng hợp xúc tác axit rắn
Preparation of bio-char from Acacia Sawdust and Sugarcane bagasse for Solid acid Catalyst Fabrication

Lê Quang Diễn^{This email address is being protected from spambots. You need JavaScript enabled to view it.}, Nguyễn Trung Thành, Nguyễn Thành Long, Nguyễn Thị Nhi, Nguyễn Minh Châu, Nguyễn Hoàng Chung

Viện Kỹ thuật Hóa học, Đại học Bách Khoa Hà Nội

ABSTRACT

Acacia Sawdust and Sugarcane bagasse are the most popular biomass from paper industrial and agricultural waste in Vietnam. In this study, biochar was prepared from both of materials by carbonization. At optimized conditions as temperature of 450-500 °C for 40-45 minutes, yield of bio char was 31-33%. After carbonization, catatysts were prepared from obtained carbon material by sunfonation. The physical properties and morphologies of bio-char were characterized by BET, SEM, respectively. The acid density was characterized by TPD-NH₃.

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Cố định enzyme glucose oxidase lên vật liệu từ tính cấu trúc core-shell Fe₃O₄NP@SiO₂ và thử hoạt tính xúc tác của nó 
Immobilization of glucose oxidase onto core-shell structure materials Fe₃O₄NP@SiO₂ and testing it’s catalytic activity

Hoàng Ngọc Ánh Nhân¹, Nguyễn Bá Trung^{1,This email address is being protected from spambots. You need JavaScript enabled to view it.}

¹ Khoa Y Dược, Đại học Đà Nẵng

ABSTRACT

This work demonstrates herein a method to fabricate magnetic nano enzyme in a form of core-shell structure denoted as Fe₃O₄NP@SiO₂-GOx. The core Fe₃O₄NP was synthesized from the mixture of Fe²⁺ and Fe³⁺ in alkaline medium using co-precipation method, which was coated with SiO₂ and then functionalized with (3-aminopropyl) triethoxysilane (APTES). Afterward, Glucose oxidase (GOx) was chemically immobilized onto amine-functionalized Fe₃O₄NP@SiO₂ using glutaraldehyde as a cross-linking agent. Physical characterization by Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), magnetic saturation, transmission electron microscopy (TEM), and thermal gravimetric analysis (TGA) showed that Fe₃O₄NP@SiO₂-GOx are spherical with diameter in the range of 17 ÷ 28 nm, magnetic saturation value of 34.2 emu/g, catalytic activity of 125 µmol.g^-1phút^-1 for glucose oxidation, ease of separation from the reaction mixture by applied magnetic field.

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Hoạt tính của xúc tác CuO biến tính bởi B cho phản ứng oxy hóa chọn lọc propylene thành acrolein
Study on catalyst based on CuO modified with Boron applied for selective oxidation of propylene to acrolein

Phạm Thị Mai Phương^{1 This email address is being protected from spambots. You need JavaScript enabled to view it.}, Vũ Quốc Quân², Lê Minh Thắng²

¹ Viện Tiên tiến Khoa học và công nghệ, Trường Đại học Bách Khoa Hà Nội
² Viện Kỹ thuật hóa học, Trường Đại học Bách Khoa Hà Nội

ABSTRACT

This work studied on catalysts based on CuO modified with Boron for the selective oxidation of propylene to acrolein. These catalysts were prepared by precipitation with the addition of Boron from 4- 7 wt.%. XRD, BET techniques were applied to characterize the catalyst. The catalytic activity tests were carried out on micro-line reactor system connected with GC online with detector TCD. It was found that the catalyst CuO - 7% Boron was the best because of the highest rate of acrolein formation but the least rate of propylene consumption.

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Tổng hợp, đặc trưng và khảo sát khả năng hấp phụ của vật liệu H-δ-MnO₂
Synthesis, structural characterization and adsorption capacity of H-δ-MnO₂

Đặng Thị Tố Nữ^{1,This email address is being protected from spambots. You need JavaScript enabled to view it.}, Nguyễn Thị Mỹ Duyên¹, Cao Văn Hoàng¹, Nguyễn Thị Liễu¹, Nguyễn Phi Hùng^1,2

¹ Khoa Hóa, Trường Đại học Quy Nhơn

² Việnnghiên cứu sư phạm và khoa học giáo dục (IPES), Trường Đại học Quy Nhơn, 170 An Dương Vương, Quy Nhơn, Bình Định.

ABSTRACT

The H-δ-MnO₂ material was synthesized through proton exchange for K-containing δ-MnO₂ (K-δ-MnO₂) nanoparticles prepared bysolid-state reaction. The obtained materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS),transmission electron microscopy (TEM), and nitrogen adsorption−desorption measurements (BET). The effects of contact time, initial pH, adsorbent dosage and initial concentration of dye were investigated. The adsorption of methylene blue (MB) as a model organic pollutant on the obtained material, is also followed by Langmuir and Freundlich adsorption isotherm. The high adsorption capacity of H-δ-MnO₂ for MB (qmax = 185.5 mg/g) shows this material can be used as an effective adsorbent for dye wastewater treatment.

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