The Ag/BiOI photocatalysts with different silver loadings were synthesized by using precipitation-photoreduction method.Influences of Ag content,reaction temperature,solution pH,common anions (NO3-,CO32-,Cl-and SO42-),flue gas components (O2,SO2 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 NO3-show no influences on Hg0 removal,while SO42-and CO32-exhibit inhibitory effects on Hg0 removal,particular for CO32-.The cyclic mercury removal test indicats that the Ag(2％)/BiOI photocatalyst is much stable in the process of Hg0 photocatalytic oxidation.%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-,NO3-,SO42-和CO32-)、烟气成分(O2,SO2和NO)、光催化剂剂量和循环次数等对单质汞(Hg0)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NO3-对Hg0的脱除效率几乎没有影响,而SO42-和CO32-会对脱汞效率有一定的抑制作用,其中CO32-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.
展开▼
