Preparation of TiO2/g-C3N4 composites and their application in photocatalytic oxidative desulfurization
Preparation of TiO2/g-C3N4 composites and their application in photocatalytic oxidative desulfurization
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TiO2/g-C3N4复合材料的制备及其在光催化氧化脱硫中的应用
DOI：
10.1016/j.ceramint.2014.03.156
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发表时间：
2014-09-01
影响因子：
5.2
通讯作者：
Wang, Jianguo
中科院分区：
文献类型：
--
作者：
Wang, Chao;Zhu, Wenshuai;Wang, Jianguo
采用两步法制备了不同质量比的TiO 2/g-C3 N4光催化剂。采用X射线粉末衍射（XRD）、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）、紫外-可见漫反射光谱（UV-vis DRS）和热重分析（TG）等手段对复合材料进行了表征。XRD结果表明，TiO 2/g-C3 N4样品中的TiO 2为非晶态。以二苯并噻吩（DBT）为氧化物，考察了样品的光催化氧化活性。反应条件，如过氧化氢（H2 O2）的量和TiO 2负载，进行了详细的研究。结果表明，在优化条件下，室温下反应2 h，DBT的去除率可达98.9%。不同硫化物的氧化活性顺序为DBT >苯并噻吩（BT）>正十二烷硫醇（RSH）。进一步的研究表明，DBT及其衍生物被转化为相应的砜，可被极性溶剂萃取。在此基础上，提出了TiO 2/g-C3 N4光催化氧化DBT的机理。(C)2014 Elsevier Ltd和Techna Group S.r.l. All rights reserved.
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.