【摘要】 用Hg Cl2与Zn(Ac O)2和Na2S共沉淀法制备Hg掺杂Zn S(HgXZn1-XS),研究在可见光激发下(λ>420 nm)HgXZn1-XS对以罗丹明B(Rh B)及2,4-二氯苯酚(2,4-DCP)的光催化降解特性。结果表明,HgXZn1-XS(n(Hg)/n(Zn+Hg))为7%(简称C0.07)时,光催化活性最好,在可见光(λ>420 nm)条件下能很好的降解Rh B和2,4-DCP,反应30 h后,Rh B的矿化率和2,4-DCP的降解率分别为39.5%和54.6%。光催化降解Rh B,Hg掺杂Zn S光催化剂具有良好的稳定性,Hg不分解,催化剂重复使用5次后光催化活性几乎没有损失。同时采用辣根过氧化物酶催化反应吸光光度法和苯甲酸荧光分析法跟踪分析测定Rh B降解过程中H2O2和羟基自由基(·OH)的变化量,表明Rh B降解机理涉及·OH历程。更多还原

【Abstract】 Zn S nanoparticles doped with mercury( HgXZn1-XS) was prepared by co-precipitation method by Hg Cl2,Zn(Ac O)2and Na2 S. The photocatalytic degradation characteristics of HgXZn1-XS was evaluated by tracing the degradation of Rhodiame B( Rh B) and 2,4-dichlorophenol(2,4-DCP) under visible light irradation( λ > 420 nm). The results showed that the photocatalytic activity for degradation of HgXZn1-XS was best when the doped dosage was 7%( called C0. 07). Catalyst C0. 07 could degrade Rh B and 2,4-DCP well under visible light irradation( λ > 420 nm) by the research of photocatalytic reaction. In 30 h the mineralization ratio of Rh B and the degradation of 2,4-DCP was 39. 5% and 54. 6%,respectively. The catalyst showed good stability according to the Rh B photocatalytic degradation experiments. The catalyst showed with no significant changes in catalytic properties and mercury was not resolved after 5 cycles of photocatalytic degradation experiments. The results of the absorptiometry of horseradish peroxidase-catalyzed reaction and benzoic acid fluorescence analysis measuring the variation of H2O2 and hydroxyl radicals during the degradation process showed that the degradation mechanism include the hydroxyl radical process.更多还原