采用镉硫共沉淀方法制备了Hg掺杂CdS(HgxCd1-xS)光催化剂,运用X射线衍射法(XRD)、X射线光电子能谱(XPS)、透射电镜(TEM)和紫外-可见吸收光谱对所制备的催化剂进行了表征;利用可见光催化降解罗丹明B(Rhodiamine B,RhB)和2,4-二氯苯酚(2, 4-dichlorophenol,2,4-DCP)为探针反应,对HgxCd1-xS可见光催化活性进行了研究,通过跟踪RhB 降解过程中吸收光谱的变化和总有机碳(TOC),评价了HgxCd1-xS对有机物的氧化降解及深度矿化能力.结果表明:HgxCd1-xS催化剂为立方晶型,Hg的最佳掺杂量为5%,其禁带宽度约为2.15 eV,对RhB和2,4-DCP均有较好的降解效果,实验条件下30 min RhB褪色率为100%, RhB的30 h矿化率为45.5%, 2,4-DCP的16 h降解率达55%.HgxCd1-xS可见光光催化降解RhB具有较高的稳定性,Hg的掺杂能有效降低CdS光腐蚀问题.通过ESR跟踪测定光催化反应过程中产生的自由基,表明降解过程涉及* OH机理.
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