Cu^(2+)催化过硫酸钾氧化吸收气态汞  

Hg oxidative absorption in potassium persulfate solution catalyzed by Cu~ 2+

作　　者：叶群峰[1] 汪大翚[1] 王成云[1] 孙冠[1] 

机构地区：[1]浙江大学环境工程系

出　　处：《化工学报》2006年第10期2450-2454,共5页CIESC Journal

基　　金：国家自然科学基金项目(20476094).~~

摘　　要：The objective of the study is to examine the conditions under which transition metal ion,Cu 2+ could catalyze potassium persulfate to oxidize gaseous mercury.The effects of the concentrations of potassium persulfate and copper sulfate,and addition of sodium thiosulfate and tertiary butanol（TBA）,a free radical scavenger on the efficiency of Hg removal were studied.The results showed that the efficiency of Hg removal increased with increasing concentrations of potassium persulfate,copper sulfate and the addition of sodium thiosulfate,while decreased with the addition of TBA.The oxidation reaction between Hg and K2S2O8 catalyzed by Cu 2+ followed pseudo-first-order kinetics.Direct rate constant and catalyzed rate constant were 3.52×10 -5 s -1 and 0.0927 L·mol -1 ·s -1 ,respectively.Furthermore,the possible reaction mechanism of gaseous mercury oxidation was also discussed.Cu 2+ was considered as an effective complex anion activator in persulfate-thiosulfate redox system and Hg removal can be achieved by both indirect oxidation of free radicals and direct oxidation by persulfate.The objective of the study is to examine the conditions under which transition metal ion, Cu^2＋ could catalyze potassium persulfate to oxidize gaseous mercury. The effects of the concentrations of potassium persulfate and copper sulfate, and addition of sodium thiosulfate and tertiary butanol （TBA）, a free radical scavenger on the efficiency of Hg removal were studied. The results showed that the efficiency of Hg removal increased with increasing concentrations of potassium persulfate, copper sulfate and the addition of sodium thiosulfate, while decreased with the addition of TBA. The oxidation reaction between Hg and K2S2Oa catalyzed by Cu^2＋ followed pseudo-first-order kinetics. Direct rate constant and catalyzed rate constant were 3.52;K 10^-5 s^-1 and 0. 0927 L·mol^-1 · s^-1, respectively. Furthermore, the possible reaction mechanism of gaseous mercury oxidation was also discussed. Cu^2＋ was considered as an effective complex anion activator in persulfate-thiosulfate redox system and Hg removal can be achieved by both indirect oxidation of free radicals and direct oxidation by persulfate.

关 键 词：过硫酸钾 硫酸铜 气态汞 氧化吸收 反应机理 

分 类 号：TQ150.9[化学工程—电化学工业] X701.7[环境科学与工程—环境工程]