可循环使用的Sn-TiO2/聚噻吩纳米杂化材料用于可见光下降解有机污染物

采用改进的溶胶-凝胶法在低温制备了Sn-TiO2/聚噻吩纳米杂化材料(SPNH)，运用X射线衍射(XRD)、扫描电镜、X射线光电子能谱(XPS)、红外光谱(IR)、紫外-可见光漫反射光谱(UV-DRS)和BET比表面积分析对所制样品进行了表征。 XRD结果证实聚噻吩(PTh)对TiO2晶相结构没有影响。 IR和UV-DRS结果表明，在掺杂的金属氧化物与PTh的纳米杂化和结合过程中， PTh表面与金属氧化物之间存在相互作用(类似核壳结构)。 XPS结果显示，纳米杂化材料中存在Sn4+以及PTh与TiO2各自所含的元素。催化剂表面吸附污染物结果发现， SPNH的吸附容量高于Sn-TiO2纳米粒子(STN)。在可见光下降解有机污染物硝基苯(NB)和孔雀绿(MG)的反应中， SPNH表现出比单纯STN更高的光催化活性和稳定性。由于STN上存在聚噻吩，使得样品表面吸附NB(24%)和MG(21%)的能力增加，从而导致更高的光催化收率。考察了该光催化剂在可见光下重复使用5次时的光催化活性，未见PTh的消耗和降解。这些高光催化活性的SPNH材料有望在工业水净化中用作光催化剂。

Recyclable Sn-TiO2/polythiophene nanohybrid material for degradation of organic pollutants under visible-light irradiation

A Sn-doped TiO2/polythiophene nanohybrid (SPNH) was synthesized by a modified sol–gel process at low temperature. The prepared catalyst was characterized by X-ray diffraction (XRD), infrared (IR) spectroscopy, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible (UV?Vis) diffuse reflectance spectrophotometry (UV-DRS), and Brunau-er-Emmett-Teller surface area analysis. The XRD results confirmed that polythiophene (PTh) had no effect on the crystal structure of TiO2. IR spectra and UV-DRS indicated that an interaction occurs between the interface of PTh and metal oxide in SPNH, and doped metal oxide nanoparticles were incorporated into PTh to form a core-shell structure. XPS analysis confirmed the presence of Sn4+and respective elements of PTh and TiO2 in SPNH. SPNH displayed higher adsorption capacities for pollutants than Sn-doped TiO2 nanoparticles (STN). In addition, SPNH exhibited higher photocata-lytic activity and stability than STN towards the degradation of organic pollutants nitrobenzene (NB) and malachite green (MG) under visible-light irradiation. Because of the presence of PTh on STN, there was an increase in the adsorption of NB (24%) and MG (21%) on the surface of SPNH, which led to a higher photocatalytic yield. The recyclability of the photocatalytic activity for the photocatalyst was examined by about five runs and not found any depletion or degradation of PTh under visible light irradiation. The high photocatalytic activity of SPNH makes it an attractive can-didate as a photocatalyst for industrial water purification.