SnS2纳米晶光催化还原水中Cr（Ⅵ）的影响因素

Influence factors of SnS2 photocatalytic reduction of hexavalent chromium in water

实验以结晶四氯化锡和硫代乙酰胺为原料,冰醋酸水溶液为溶剂,通过水热法合成SnS2纳米粉,并采用XRD、EDX、TEM、HRTEM测试手段对其进行了表征。考察了催化剂用量、Cr(Ⅵ)初始质量浓度、溶液pH对Cr(Ⅵ)的吸附量,尤其是溶液中共存的阴阳离子对水溶液光催化还原效果的影响。实验结果表明:SnS2催化剂用量越大,Cr(Ⅵ)水溶液的初始质量浓度越低,溶液的酸度越大,SnS2纳米粉对Cr(Ⅵ)的吸附量越多,光催化还原水中Cr(Ⅵ)的效率越高;溶液中高质量浓度的Cu^2+离子对纳米SnS2光催化还原水中Cr(Ⅵ)有促进作用,Na^+和NO3^-离子的存在不会产生影响,而溶液中的C2O4^2-和低质量浓度的Cu^2+离子却起抑制作用。

SnS2 nanocrystals was synthesized in acetic acid aqueous solution by hydrothermal method using SnCl4·5H2O and thioacetamide as raw materials,and characterized by XRD,EDX,TEM and HRTEM.The influence factors of SnS2 photocatalytic reduction of Cr(Ⅵ)aqueous solution were explored,including dosage of catalyst,initial mass concentration of Cr(Ⅵ),pH of the solution,adsorption amount of Cr(Ⅵ)and coexisting ions in aqueous Cr(Ⅵ).The experimental results showed that with the dosages of SnS2 is larger,the initial concentration and pH of Cr(Ⅵ)aqueous solution are lower,and the more adsorption amount of SnS2 is,the higher photocatalytic efficiency is,high mass concentrations of Cu^2+in the Cr(Ⅵ)aqueous solution can promote photocatalytic reduction of Cr(Ⅵ),Na+and NO3^-have no effect,but C2O4^2-and low concentrations of Cu^2+can cause inhibitory action.