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Synergistic interactions of Cu and N on surface altered amorphous TiO2 nanoparticles for enhanced photocatalytic oxidative desulfurization of dibenzothiophene

Hitam, C. N. C. and Jalil, A. A. and Triwahyono, S. and Ahmad, A. and Jaafar, N. F. and Salamun, N. and Fatah, N. A. A. and Teh, L. P. and Khusnun, N. F. and Ghazali, Z. (2016) Synergistic interactions of Cu and N on surface altered amorphous TiO2 nanoparticles for enhanced photocatalytic oxidative desulfurization of dibenzothiophene. RSC Advances, 6 (80). pp. 76259-76268. ISSN 2046-2069

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Abstract

Amorphous TiO2 (AT) nanoparticles were prepared by a simple sol-gel method and subsequent incorporation with copper (5-20 wt%) via an electrochemical method in the presence of a supporting electrolyte, tetraethylammonium perchlorate (TEAP), was used to synthesize CuO/TiO2 (CAT) catalysts. The physicochemical properties of the catalysts were studied by XRD, N2 adsorption-desorption, TEM, FTIR, XPS, ESR and UV-Vis DRS. Photocatalytic testing on the oxidative desulfurization of dibenzothiophene (DBT) under UV and visible light irradiation demonstrated that the CAT catalysts were active under both conditions. It was found that Ti3+ surface defects (TSD), oxygen vacancies (Vo), CuO, Ti-O-N/O-Ti-N and Ti-O-Cu bonds played an important role in photooxidation. The TSD, Vo, CuO, N 1s and Cu 2p states in the CAT catalysts acted as electron trappers to hinder electron-hole recombination. In addition, these TSD, Vo, N 1s and Cu 2p species also contributed to the lowering of the CAT band gap, which enabled photooxidation to be carried out in the visible light region. The photooxidation followed a pseudo-first order Langmuir-Hinshelwood model with adsorption being the controlling step.

Item Type:Article
Uncontrolled Keywords:Catalysts, Copper oxides, Desulfurization, Electrolytes, Energy gap, Inorganic compounds, Light, Nanoparticles, Oxygen vacancies, Photooxidation, Sol-gel process, Sol-gels, Synthesis (chemical), Titanium dioxide, Adsorption desorption, ELectrochemical methods, Electron-hole recombination, Langmuir-Hinshelwood models, Oxidative desulfurization, Physicochemical property, Supporting electrolyte, Synergistic interaction, Surface defects
Subjects:T Technology > TP Chemical technology
Divisions:Chemical Engineering
ID Code:74331
Deposited By: Widya Wahid
Deposited On:29 Nov 2017 23:58
Last Modified:29 Nov 2017 23:58

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