Please use this identifier to cite or link to this item: https://dspace.ctu.edu.vn/jspui/handle/123456789/103780
Title: Visible light photocatalytic degradation of organic dyes using W-modified TiO₂/SiO₂ catalyst
Authors: Nguyen, Van Hung
Bui, Thi Minh Nguyet
Nguyen, Huu Nghi
Vo, Thang Nguyen
Thai, Vu Binh
Nguyen, Thi Thanh Tu
Nguyen, Nho Dung
Dinh, Quang Khieu
Keywords: W-modified TiO₂
Silica
Organic dyes
Photocatalytic degradation
Issue Date: 2021
Series/Report no.: Vietnam journal of Chemistry;Vol.59, No.05 .- P.620-638
Abstract: In the present study, the synthesis of W-modified TiO₂/SiO₂ composite and its catalytic activity in the visible light region is demonstrated. The W-modified TiO₂/SiO₂: composite was obtained from the hydrolysis of a mixture containing titanium (IV) oxysulfate, ammonium metatungstate, and SiO₂, powder in an alkaline medium. The obtained materials were characterized by using X-ray diffraction (XRD), Fourier transformation-infrared spectroscopy (FT-IR), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray elemental mapping observation, nitrogen adsorption/desorption isotherms, photoluminescence spectra (PL), and ultraviolet visible diffusive reflectance spectroscopy (UV-Vis DRS). In this material, W-modified TiO₂ nanoparticles of about 3-5 nm were highly dispersed on the silica network. Both W-modified TiO₂ and W-modified TiO₂, decorated on the SiO₂ substrate significantly promoted the visible light absorption of the material. The photocatalytic activity of the prepared catalyst was assessed through the photodegradation of Methylene blue, Rhodamine-B, Methyl orange, and Congo red dyes under visible light illumination. It was found that the kinetic and equilibrium data of the photocatalytic process fitted the modified Langmuir-Hinshelwood model well. Recyclable studies have shown that the catalyst still retained its original activity after the third cycle.
URI: https://dspace.ctu.edu.vn/jspui/handle/123456789/103780
ISSN: 2525-2321
Appears in Collections:Vietnam Journal of Chemistry

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