江汉大学学报(自然科学版) ›› 2019, Vol. 47 ›› Issue (1): 41-45.doi: 10.16389/j.cnki.cn42-1737/n.2019.01.007

• 生物化学与环境化学 • 上一篇    下一篇

不同碱液调节pH 水热制备钨酸铋及其光催化性能研究

鲁珍,王亚珍*,刘晓烨,何丹   

  1. 江汉大学 化学与环境工程学院,湖北 武汉 430056
  • 出版日期:2019-02-28 发布日期:2019-02-25
  • 通讯作者: 王亚珍
  • 作者简介:鲁珍(1987—),女,实验师,硕士,研究方向:水环境污染、环境化学。

Preparation and Photocatalytic Activity of Bi2WO6 Catalyst by Hydrothermal Method with pH Adjusted by Different Alkali Liquor

LU Zhen,WANG Yazhen*,LIU Xiaoye,HE Dan   

  1. School of Chemical and Environmental Engineering,Jianghan University,Wuhan 430056,Hubei,China
  • Online:2019-02-28 Published:2019-02-25
  • Contact: WANG Yazhen

摘要: 以硝酸铋(Bi(NO33·5H2O)和钨酸钠(Na2WO4·2H2O)为原料,分别以NaOH 和NH3·H2O为pH 调节剂,采用水热法制备Bi2WO6催化剂,通过X 射线衍射(XRD)、扫描电镜(SEM)、紫外-可见吸收光谱(UV-Vis)和比表面积(BET)对催化剂进行表征,分析了使用不同碱液调节pH对催化剂晶型、形貌、吸光性和比表面积的影响。结果表明,使用NaOH调节pH制备的Bi2WO6结晶度更好,片状结构规则,紫外-可见光吸收边发生红移,能隙带较小,为2. 88 eV;使用NH3·H2O调节pH 制备的Bi2WO6比表面积大于NaOH 调节pH制备的Bi2WO634%。在λ >400 nm 的可见光区降解罗丹明B 模拟废水的结果表明,NaOH 调节pH 制备的Bi2WO6光催化效率更高,NH3·H2O调节pH制备的Bi2WO6光催化效率相对较低。

关键词: 钨酸铋(Bi2WO6), 水热法, 光催化降解

Abstract: The Bi2WO6 catalyst was prepared by hydrothermal method with (Bi(NO33·5H2O)and (Na2WO4·2H2O) as raw materials,using NaOH and NH3·H2O as pH regulator,respectively. The properties of the catalyst were investigated by XRD,SEM,UV-Vis,and BET tests,the effects of different alkali liquor on crystal form,morphology,absorbency and specific surface area of the catalyst were analyzed. The results indicated that the samples using NaOH to adjust pH had better crystal form,regular sheet structure and smaller energy band gap with 2.88 eV because of UV-Vis absorption edge red-shift. The specific surface area of the sample using NH3·H2O was 34% bigger than using NaOH. According to degradation of simulated wastewater of Rhodamine B in the visible region of λ > 400 nm,the results showed that the photocatalytic efficiency of Bi2WO6 with pH regulated by NaOH was higher,while using NH3·H2O was relatively lower.

Key words: bismuth tungstate(Bi2WO6), hydrothermal method, photocatalytic degradation

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