Fe(Ⅲ)-柠檬酸盐体系中Cr(Ⅵ)还原和酸性黄的协同降解  

Synergy effect on photocatalytic reduction of Cr(Ⅵ) and oxidation of acid yellow in iron(Ⅲ)-citrate system

作　　者：孙杰[1] 陈果仓[1] 田奇峰[2] 郑梦靓[1] 

机构地区：[1]中南民族大学环境工程研究所,武汉430074 [2]十堰市第一中学,十堰442000

出　　处：《环境化学》2013年第3期381-386,共6页Environmental Chemistry

基　　金：国家自然科学基金项目(21007018);湖北省自然科学基金项目(2008CDB400)资助

摘　　要：研究了在紫外光照射下,Fe(Ⅲ)-柠檬酸盐体系同时还原Cr(Ⅵ)和氧化酸性黄.同时,考察了溶液的pH值、Fe(Ⅲ)的浓度、柠檬酸盐(cit3-)的浓度、酸性黄(AY)的浓度以及Cr(Ⅵ)的初始浓度对反应速率的影响.分析了光反应动力学.研究结果表明,Cr(Ⅵ)的光还原和酸性黄的氧化互相促进,具有协同效应;Cr(Ⅵ)光还原的初始速率和酸性黄氧化的初始速率随着Fe(Ⅲ)的浓度、柠檬酸盐的浓度、酸性黄的浓度以及Cr(Ⅵ)的初始浓度的增加而增大;Cr(Ⅵ)的光还原和酸性黄光氧化的表观动力学方程分别为:-dCCr(Ⅵ)/dt=0.1123[Cr(Ⅵ)]0.16[Fe(Ⅲ)]0.4[cit3-]0.11[AY]0.37,-dCAY/dt=0.0916[Cr(Ⅵ)]0.72[Fe(Ⅲ)]0.74[cit3-]0.42[AY]0.3.Synergy effect of the simultaneous photocatalytic reduction of Cr（Ⅵ） and oxidation of acid yellow in Fe（Ⅲ）-citrate system was investigated under UV irridiation.The effects of pH and the initial concentrations of Fe（Ⅲ）,citrate（cit3-）,Cr（Ⅵ） and acid yellow（AY） were discussed in detail.The kinetics of Cr（Ⅵ） photoreduction and acid yellow photooxidation were analyzed.The results indicated that the photoreduction of Cr（Ⅵ） and photooxidaton of acid yellow could occur simultaneously,revealing a synergism.The photoreduction efficiency of Cr（Ⅵ） and photooxidaton efficiency of acid yellow increased with the decreasing pH value of the simulated solution.The initial rates of Cr（Ⅵ） photoreduction and acid yellow photooxidation increased with increasing the initial concentrations of Fe（Ⅲ）,citrate,Cr（Ⅵ） and acid yellow.The apparent kinetic equation of Cr（Ⅵ） photoreduction and acid yellow photooxidation could be expressed respectively as-dCAY/dt=0.11230.160.40.110.37 and-dCAY/dt=0.72Fe（Ⅲ）]0.740.42 0.3.

关 键 词：协同效应 铬 酸性黄 铁(Ⅲ)-柠檬酸盐体系 光还原 光氧化 

分 类 号：O643.32[理学—物理化学] X703[理学—化学]