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

doi:10.1016/S1872-2067(15)60944-5

催化学报 ›› 2015, Vol. 36 ›› Issue (10): 1668-1678.DOI: 10.1016/S1872-2067(15)60944-5

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

M. Ravi Chandra^a, T. Siva Rao^a, B. Sreedhar^b

a 安得拉邦大学化学学院无机和分析化学系, 维萨卡帕特南530003, 印度;
b 印度化学技术研究所无机和物理化学部, 海得拉巴500007, 印度

收稿日期:2015-02-23 修回日期:2015-06-22 出版日期:2015-09-26 发布日期:2015-09-26
通讯作者: T. Siva Rao. 电话: +91-7702110459; 电子信箱: sivaraotvalluri.16@gmail.com

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

M. Ravi Chandra^a, T. Siva Rao^a, B. Sreedhar^b

a Department of Inorganic & Analytical Chemistry, School of Chemistry, Andhra University, Visakhapatnam 530003, India;
b Inorganic & Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500007, India

Received:2015-02-23 Revised:2015-06-22 Online:2015-09-26 Published:2015-09-26

摘要/Abstract

摘要：

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.

关键词: 锡, 二氧化钛, 聚噻吩, 纳米杂化材料, 硝基苯, 孔雀绿, 可见光, 光催化, 可循环使用性

Abstract:

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 Brunauer-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 photocatalytic 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 candidate as a photocatalyst for industrial water purification.

Key words: Tin, Titanium dioxide, Polythiophene, Nanohybrids, Nitrobenzene, Malachite green, Visible light, Photocatalysis, Reusability

M. Ravi Chandra, T. Siva Rao, B. Sreedhar. 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[J]. 催化学报, 2015, 36(10): 1668-1678.

M. Ravi Chandra, T. Siva Rao, B. Sreedhar. Recyclable Sn-TiO₂/polythiophene nanohybrid material for degradation of organic pollutants under visible-light irradiation[J]. Chinese Journal of Catalysis, 2015, 36(10): 1668-1678.

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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

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

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