高等学校化学学报

高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (8): 1812.

• 研究论文 • 上一篇    下一篇

磷钨酸均相光催化还原降解水中偶氮染料酸性大红3R

李克斌1,赵锋1,魏红2,张涛1,王勤勤1   

  1. 1. 西北大学化学与材料科学学院, 合成与天然功能分子化学教育部重点实验室, 西安 710069;
    2. 西安理工大学, 西北水资源与环境生态教育部重点实验室, 西安 710048
  • 收稿日期:2010-12-28 修回日期:2011-05-20 出版日期:2011-08-10 发布日期:2011-07-19
  • 通讯作者: 李克斌 E-mail:kebinli@sohu.com
  • 基金资助:

    国家自然科学基金(批准号: 51009115)、陕西省教育厅科学研究计划项目(批准号: 09JK757)、西北大学研究生创新基金(批准号: 09YSY21)和陕西省科技计划项目(批准号: 2010JQ5008)资助.

Photocatalytic Reductive Degradation of Acid Red 3R by Posphotungstic Acid

LI Ke-Bin1*, ZHAO Feng1, WEI Hong2, ZHANG Tao1, WANG Qin-Qin1   

  1. 1. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, School of Chemistry and Material Science, Northwest University, Xian 710069, China;
    2. Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education Xian University of Technology, Xian 710048, China
  • Received:2010-12-28 Revised:2011-05-20 Online:2011-08-10 Published:2011-07-19
  • Contact: LI Ke-Bin E-mail:kebinli@sohu.com
  • Supported by:

    国家自然科学基金(批准号: 51009115)、陕西省教育厅科学研究计划项目(批准号: 09JK757)、西北大学研究生创新基金(批准号: 09YSY21)和陕西省科技计划项目(批准号: 2010JQ5008)资助.

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被引次数

57

摘要： 以磷钨酸(H3PW12O4记为PW12)作为光催化剂，在异丙醇作为电子给体的条件下对偶氮染料酸性大红3R（记为AR3R）进行光催化均相还原脱色研究。循环伏安法、暗反应、O2竞争抑制等实验表明杂多蓝（PW12O404-）对AR3R 具有明显的还原脱色作用。实验研究了催化剂PW12用量、异丙醇浓度、染料浓度、盐浓度对PW12/异丙醇光催化还原降解酸性大红3R的影响。结果表明：AR3R的光催化脱色速率随催化剂PW12、异丙醇浓度的增加而增加，最后趋于恒定；随染料初始浓度增加，初始光解速率增大，且符合Langmuir-Hinshelwood动力学方程；随盐浓度增加，染料脱色速率减小，表现为负的盐效应。由此推测AR3R与光反应生成的杂多蓝预先进行复合，然后发生电子转移引起偶氮染料还原脱色，杂多蓝氧化复原。本研究结果表明磷钨酸/异丙醇/UV绿色光催化还原体系能够有效用于偶氮染料废水的还原脱色处理。

关键词: 杂多酸, 光催化, 偶氮染料, 酸性大红3R, 还原脱色

Abstract: A strategy for reductive degradation of azo dye Acid Red 3R (AR3R) by using the in-situ generated heteropoly blue (PW12O404-) was investigated. Heteropoly blue was produced by UV irradiation on aqueous solutions containing posphotungstic acid (photocatalyst) and isopropanol (electron donor). The reduction potential of AR3R was measured by cyclic voltammetry and used to assess the thermodynamic feasibility of reduction of AR3R by heteropoly blue. A dark reaction between AR3R and heteropoly blue was carried out to further confirm and reinforce reductive degradation of AR3R by heteropoly blue. In addition, the effects of various factors such as the photocatalyst amount, isopropanol dosage, dye concentrations, and ionic strength on photodegradation of AR3R were evaluated. The results showed that increase of posphotungstic acid and/or isopropanol concentration accelerated photodegradation of AR3R till a saturation value. The initial rates of photodegradation of AR3R increased with increasing in dye concentration, which could be described by the Langmuir-Hinshelwood equation. However, salt concentration displayed a negative effect on photocatalytic degradation of dye. It was assumed that the charge-transfer within a precomplex formed by photoreduced heteropoly blue and AR3R lead to the reductive degradation of dye and oxidative regeneration of catalyst. This study also indicates that POM/isopropanol/UV system provides a green route for reductive decolorization of azo dyes.

Key words: Polyoxometalate, Photocatalysis, Azo dye, Acid Red 3R, Reductive decolorization

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