- Details
- Published on 23 September 2020
Photocatalytic degradation of Rhodamine-B under visible light region by ZnO nanoparticles loaded on activated carbon made from longan seed biomass
Nguyễn Văn Hưng1This email address is being protected from spambots. You need JavaScript enabled to view it., Bùi Thị Minh Nguyệt1, Bùi Thị Thùy Linh1, Nguyễn Hữu Nghị1, Nguyễn Thanh Tươi1, Nguyễn Anh Tiến2, Lê Lâm Sơn3
1Trường Đại học Đồng Tháp, 783-Phạm Hữu Lầu, Phường 6, TP. Cao Lãnh, Tỉnh Đồng Tháp
2 Trường Đại học Sư phạm TP. Hồ Chí Minh
3Trường Đại học Khoa học, Đại học Huế
ABSTRACT
In the present study, the synthesis of ZnO/LSAC through pyrolysis of the carbonized material prepared from longan seed, zinc acetate in alkaline medium. The obtained materials was characterized by means of XRD, SEM, TEM, BET and UV-Vis-DRS. The XRD patterns of ZnO/LSAC nanocomposites were assigned to wurtzite structure of ZnO with crystallite size about 15 to 30 nm. SEM and TEM observations showed the spherical ZnO particles formed on the activated carbon. The band gap energy and specific surface area of ZnO/LSAC were found to be 2.79 eV and 294.4 m2/g, respectively. The photocatalytic activities of the prepared materials were evaluated for the degradation of Rhodamine B (RhB) dye. The removal of RhB was found to be pH dependent, and the optimized removal efficiency reached to 93.75% and the mineralization level was over 84,09% at initial RhB concentration of 40 mg.L-1 and pH 7 following 120 min under visible-light illumination. The kinetic studies showed the decolorization of RhB followed pseudo first-order kinetics with the rate constant were determined kapp = 1.67×10-2 min−1.
