物理化学学报 >> 2016, Vol. 32 >> Issue (2): 551-557.doi: 10.3866/PKU.WHXB201511304

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Bi2Sn2o7的不同水热法制备及其可见光光催化除As(Ⅲ)性能分析

庄建东1,*(),田勤奋1,刘平2   

  1. 1 福建农林大学材料工程学院, 福州 350002
    2 福州大学化学学院,能源与环境光催化国家重点实验室, 福州 350002
  • 收稿日期:2015-10-06 发布日期:2016-01-30
  • 通讯作者: 庄建东 E-mail:jdzhuang113@163.com
  • 基金资助:
    国家自然科学基金(21303244);福建农林大学杰出青年基金(XJQ201419)

Bi2Sn2o7 Visible-Light Photocatalysts: Different Hydrothermal Preparation Methods and Their Photocatalytic Performance for As(Ⅲ) Removal

Jian-Dong ZHUANG1,*(),Qin-Fen TIAN1,Ping LIU2   

  1. 1 College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, P. R. China
    2 State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, P. R. China
  • Received:2015-10-06 Published:2016-01-30
  • Contact: Jian-Dong ZHUANG E-mail:jdzhuang113@163.com
  • Supported by:
    the National Natural Science Foundation of China(21303244);Outstanding Youth Fund of Fujian Agriculture andForestry University, China(XJQ201419)

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摘要：

利用微波和普通水热法合成出了具有可见光响应的Bi2Sn2o7纳米光催化剂,并用X射线衍射(XRD)、氮气吸脱附、紫外-可见漫反射光谱(UV-Vis DRS)、扫描电镜(SEM)、透射电镜(TEM)、电子顺磁共振谱(ESR)、X射线光电子能谱(XPS)等技术对样品的晶相、比表面积、光吸收性能、形貌、光催化活性物种等结构与性质进行了系统表征,比较微波水热Bi2Sn2o7(MH-BSo)与普通水热Bi2Sn2o7(TH-BSo)形貌和微结构,并考察两者在可见光光照下光催化氧化As(Ⅲ)的性能差别。实验结果表明, MH-BSo具有更细小的粒径和更大的比表面积,而在可见光照射下, MH-BSo样品比TH-BSo样品具有更好的As(Ⅲ)的光催化氧化能力(可达98.7%)。此外,对Bi2Sn2o7纳米光催化剂氧化去除As(Ⅲ)的光催化机理进行初步探索,结果表明超氧自由基(o2-•)和空穴(hVB+)是主要起作用的中间反应活性物种。

关键词: 锡酸铋, 微波水热法, 普通水热法, 可见光催化, As(Ⅲ)氧化

Abstract:

Bi2Sn2o7, synthesized through different hydrothermal routes (the microwave hydrothermal method (MH-BSo) and the traditional hydrothermal method (TH-BSo)), was used for photocatalytic removal of arsenic from aqueous solution. The as-synthesized Bi2Sn2o7 products were characterized by X-ray diffraction (XRD), N2 sorption-desorption, UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), transmission electron microscopy (TEM), electron spin resonance (ESR), X-ray photoelectron spectra (XPS), and electrochemistry technology. Under visible light irradiation, the MH-BSo sample exhibited a higher photocatalytic activity (up to 98.7%) than that of the TH-BSo sample during the oxidization of arsenite (Aso3)3-. The active species, o2-• and hVB+, were identified as the primary active species responsible for As(Ⅲ) oxidation. In addition, a possible mechanism for the photo-oxidation of As(Ⅲ) over Bi2Sn2o7 is proposed.

Key words: Bi2Sn2o7, Microwave hydrothermal method, Traditional hydrothermal method, Visible-light photocatalysis, As(Ⅲ) oxidation