实验参数对Ag/BiOI光催化剂湿法脱除气态单质汞的影响  

Effect of experimental parameters on Hg^0 removal by Ag/BiOI photocatalyst using wet process

作　　者：张安超[1] 李成伟[1] 路好[1] 宋军[1] 孙志君[1,2] 刘志超[1] 向军[2] 

机构地区：[1]河南理工大学机械与动力工程学院,河南焦作454000 [2]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《河南理工大学学报（自然科学版）》2018年第2期74-81,共8页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(51676064;51306046;51576086);河南省高校基本科研业务费项目(NSFRF140204);河南省高等学校青年骨干教师资助计划项目(2016GGJS-038)

摘　　要：采用沉淀-光还原法制备了不同Ag负载量的碘氧化铋(Ag/BiOI)可见光催化剂,在小型湿法光催化脱汞装置上考察了Ag负载量、反应溶液温度、pH、阴离子(Cl^-,NO_3^-,SO_4^(2-)和CO_3^(2-))、烟气成分(O_2,SO_2和NO)、光催化剂剂量和循环次数等对单质汞(Hg^0)脱除效率的影响。结果表明:与BiOI相比,Ag负载可以大幅提高其脱汞活性,Ag负载量为2 wt%时,其脱汞效率高达98%;Cl-和NO_3^-对Hg0的脱除效率几乎没有影响,而SO_4^(2-)和CO_3^(2-)会对脱汞效率有一定的抑制作用,其中CO_3^(2-)对脱汞效率的影响尤为严重。循环脱汞实验表明Ag(2%)/BiOI光催化剂的稳定性良好。The Ag/BiOI photocatalysts with different silver loadings were synthesized by using precipitationphotoreduction method. Influences of Ag content,reaction temperature,solution pH,common anions(NO-3,CO_3^(2-),Cl-and SO_4^(2-)),flue gas components(O_2,SO_2 and NO),photocatalyst dosage and cyclic utilization on elemental mercury(Hg0) removal efficiency were investigated in a laboratory-scale wet bubbling Hg0 photocatalytic reactor. The results show that in comparison to BiOI,Hg0 removal efficiency of Ag/BiOI was greatly improved when a small amount of metallic silver were added. In particular,when the Ag content is 2 % in Ag(2%)/BiOI material,the Hg0 removal efficiency reaches 98 %. Cl-and NO-3 show no influences on Hg0 removal,while SO_4^(2-) and CO_3^(2-) exhibit inhibitory effects on Hg0 removal,particular for CO_3^(2-). The cyclic mercury removal test indicats that the Ag(2 %)/BiOI photocatalyst is much stable in the process of Hg0 photocatalytic oxidation.

关 键 词：气态单质汞 脱除 Ag/BiOI 光催化剂 湿法 实验参数 

分 类 号：X511[环境科学与工程—环境工程]