铁(III)-丙酮酸盐配合物光解引发水中铬(Ⅵ)还原  

Cr(Ⅵ) REDUCTION INDUCED BY THE PHOTOLYSIS OF IRON (Ⅲ)-PYRUVATE COMPLEXES

作　　者：封享华[1] 丁世敏[1] 吴峰[1] 邓南圣[1] Nikolai Bazhin 

机构地区：[1]武汉大学环境科学系 [2]Institute of Chemical Kinetics and Combustion,ul.Institutskaya3,Novosibirsk,630090,Russia

出　　处：《环境化学》2005年第3期307-310,共4页Environmental Chemistry

基　　金：国家自然科学基金(20177017);中俄(NSFC RFBR)协议(2004-2005)资助项目

摘　　要：初步研究了含有Fe(III)及丙酮酸盐的溶液在高压汞灯照射下对铬(VI)的光还原反应.考察了溶液pH值、Fe(III)浓度、丙酮酸钠浓度、Cr(VI)浓度对反应的影响.分析了光还原反应的动力学及反应机制.结果表明:铁丙酮酸盐体系能光还原Cr(VI);最佳pH为3.0;Cr(VI)光还原的初始速率随着加入的铁(III)、丙酮酸盐、Cr(VI)初始浓度的增加而增加;实验条件下的表观动力学方程为:-dCCr(VI)/dt=0.021[Cr(VI)]0.39[Fe(III)]1.05[CH3COCOONa]0.39;Fe(III)-丙酮酸盐配合物光解产生的Fe(II)是Cr(VI)的主要还原剂.The photochemical reduction of Cr(VI) in aqueous solutions containing Fe(III)-pyruvate complexes was preliminarily investigated under a high-pressure mercury lamp. The effects of pH, the initial concentrations of Fe(III), pyruvate and Cr(VI) were also evaluated in details. The kinetics and mechanism of (Cr(VI))photoreduction were analyzed. The result indicated that (Cr(VI))could be photo-reduced by the iron(III)-pyruvate complexes system and the optimum pH for photo reduction of Cr(VI) was 3.0. The initial rates of Cr(VI) photoreduction increased with the increasing initial concentrations of Fe(III), pyruvate and Cr(VI). Under the conditions tested, the apparent kinetics equation was -dC_(Cr)/dt=0.021C^(0.39)_(Cr)C^(1.05)_(Fe)C^(0.39)_(P). Fe(II)(generated) by the photolysis of iron(III)-pyruvate complexes was the main reductant.

关 键 词：铁 丙酮酸盐 光解 水 铬 光催化还原 

分 类 号：X132[环境科学与工程—环境科学]