高等学校化学学报2011，Vol.32Issue(8)：1812-1818,7.
磷钨酸均相光催化还原降解水中偶氮染料酸性大红3R
Photocatalytic Reductive Degradation of Acid Red 3R by Posphotungstic Acid
摘要
Abstract
A strategy for reductive degradation of azo dye Acid Red 3R( AR3R) using in-situ generated he-teropoly blue (PW12O4-40) as reducer 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 photo-degradation of AR3 R increased with increasing in dye concentration, which could be described by the Lang-muir-Hinshelwood equation. However, salt concentration displayed a negative effect on photocatalytic degradation of dye. It is 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.关键词
杂多酸/光催化/偶氮染料/酸性大红3R/还原脱色Key words
Polyoxometalate/ Photocatalysis/ Azo dye/ Acid Red 3R/ Reductive decolorization分类
化学化工引用本文复制引用
李克斌,赵锋,魏红,张涛,王勤勤..磷钨酸均相光催化还原降解水中偶氮染料酸性大红3R[J].高等学校化学学报,2011,32(8):1812-1818,7.基金项目
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. （批准号:51009115）
