Preparation of TiO2/g-C3N4 composites and their application in photocatalytic oxidative desulfurization

被引:158
作者
Wang, Chao [1 ]
Zhu, Wenshuai [1 ]
Xu, Yehai [1 ]
Xu, Hui [1 ]
Zhang, Ming [1 ]
Chao, Yanhong [1 ]
Yin, Sheng [1 ]
Li, Huaming [1 ]
Wang, Jianguo [2 ]
机构
[1] Jiangsu Univ, Sch Chem & Chem Engn, Zhenjiang 212013, Peoples R China
[2] Qidong Municipal Environm Protect Bur, Qidong 226200, Peoples R China
关键词
TiO2/g-C3N4; Photocatalytic oxidation; Desulfurization; ULTRA-DEEP DESULFURIZATION; GRAPHITE-LIKE C3N4; VISIBLE-LIGHT; MOLECULAR-OXYGEN; CARBON NITRIDE; IONIC LIQUIDS; SELECTIVE ADSORPTION; ROOM-TEMPERATURE; DIESEL FUEL; DUAL COCATALYSTS;
D O I
10.1016/j.ceramint.2014.03.156
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Photocatalysts with different mass ratios of TiO2/g-C3N4 were prepared by a two-step method. The composites were characterized by X-ray powder diffraction (XRD), scanning electron microscope (SEM), Fourier Transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflection spectra (UV-vis DRS) and thermogravimetric (TG). The XRD result revealed that TiO2 existing in the TiO2/g-C3N4 sample was amorphous. The photocatalytic oxidation activity of the samples was evaluated by photoxidation of dibenzothiphene (DBT). Reaction conditions, such as the amount of hydrogen peroxide (H2O2) and TiO2 loading, were investigated in detail. The results showed that the removal of DBT could get to 98.9% under optimized conditions after 2 h at room temperature. The oxidation reactivity of the different sulfur compounds was found to be in the order of DBT > benzothiophene (BT) > n-dodecanethiol (RSH). Further studies showed that DBT and its derivatives were converted to the corresponding sulfone, which could be extracted by the polar solvent. Moreover, the mechanism of photocatalytic oxidation of DBT by TiO2/g-C3N4 was proposed based on the present experimental results. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码:11627 / 11635
页数:9
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