Ni(OH)2/g-C3N4的制备及其光催化还原U(Ⅵ)的性能试验研究

Preparation and Photocatalytic Reduction Properties for U(Ⅵ)of Ni(OH)2/g-C3N4

研究了以醋酸镍和氢氧化钠为原料、石墨相氮化碳(g-C3N4)为载体,采用原位沉积生长法制备Ni(OH)2/g-C3N4复合光催化剂,并对该复合催化剂物相和性能进行了表征。结果表明:负载Ni(OH)2的g-C3N4复合光催化剂光生电子-空穴复合率明显降低;利用负载0.5%Ni(OH)2的Ni(OH)2/g-C3N4复合光催化剂催化还原废水中的U(Ⅵ),在U(Ⅵ)质量浓度40 mg/L、pH=5条件下光照80 min后,U(Ⅵ)的光催化还原率达89%,还原效果较好。

Preparation of Ni(OH)2/g-C3N4 composite photocatalyst using nickel acetate and sodium hydroxide as raw material and g-C3N4 as carrier by in-situ deposition growth method was investigated.The phase and photocatalytic reduction properties for U(Ⅵ)of the Ni(OH)2/g-C3N4 were characterized.The results show that after loading of Ni(OH)2,g-C3N4 photogenerated electron-hole recombination rate is significantly reduced.The g-C3N4 composite photocatalyst loaded with 0.5%Ni(OH)2 is used for catalytic reduction of U(Ⅵ)in wastewater.Under the conditions of U(Ⅵ)mass concentration of 40 mg/L,wastewater pH of 5,illumination time of 80 min,the photocatalytic reduction rate of U(Ⅵ)reaches 89%.