Improved performance of surface functionalized TiO2/activated carbon for adsorption-photocatalytic reduction of Cr(VI) in aqueous solution
Improved performance of surface functionalized TiO2/activated carbon for adsorption-photocatalytic reduction of Cr(VI) in aqueous solution
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DOI：
10.1016/j.mssp.2015.05.034
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发表时间：
2015-11-01
影响因子：
4.1
通讯作者：
Wu, Junming
中科院分区：
文献类型：
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作者：
Fu, Xiaofei;Yang, Hanpei;Wu, Junming
采用溶胶-水热法制备了活性炭负载二氧化钛（TiO 2/AC）。采用硝酸和氯化亚砜对所制备的TiO 2/AC进行表面改性，并在改性后的TiO 2/AC上进行二乙烯三胺的表面修饰。采用透射电子显微镜、傅立叶变换红外光谱、X射线光电子能谱、X射线衍射、BET吸附等手段对材料进行表征，并通过去除水中Cr（VI）评价了其吸附-光催化还原活性。结果表明，TiO 2颗粒均匀地沉积在活性炭表面，二乙烯三胺通过酰胺键共价接枝到TiO 2/AC表面。二乙烯三胺功能化的TiO 2/AC（TiO 2/AC-DETA）通过静电、配位和氢键作用对Cr（VI）表现出良好的吸附性能。结果表明，TiO 2/AC-DETA光催化剂对Cr（VI）的还原活性显著提高，这主要归因于Cr（VI）在AC表面的富集，以及AC与TiO 2之间通过C-O-Ti键形成的致密异质结紧密接触导致Cr（VI）和光生电子的界面快速转移. (C)2015爱思唯尔有限公司版权所有。
TiO2 coated on activated carbon (TiO2/AC) was synthesized by a facile sol-hydrothermal preparation. The as-prepared TiO2/AC was modified by sequential treatment of nitric acid and thionyl chloride, followed by surface attaching of diethylenetriamine. The obtained materials were characterized by transmission electron microscopy, Fourier transform-infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, BET adsorption, and their adsorption-photocatalytic reduction activities were evaluated by the removal of aqueous Cr(VI). The results showed that TiO2 particles were homogeneously deposited on the surface of activated carbon, and diethylenetriamine was grafted covalently onto the surface of TiO2/AC through amide linkage. The diethylenetriamine-functionalized TiO2/AC (TiO2/AC-DETA) exhibits high adsorption capability for Cr(VI) through electrostatic, coordinative and hydrogen bonding interactions. The significant enhancement of photocatalytic activity of TiO2/AC-DETA for reduction of Cr(VI) was observed, which was mainly attributed to the enrichment of Cr(VI) onto the surface of AC and successive fast interfacial transfer of Cr(VI) and photogenerated electrons resulted from the intimate contact between AC and TiO2 through dense heterojunctions by forming of C-O-Ti linkages. (C) 2015 Elsevier Ltd. All rights reserved.