摘要
研究了采用水热法制备MnO_(2)@g-C_(3)N_(4)复合光催化剂(Mn-CN),并分析了其形貌、结构和光电性能,考察了Mn-CN对放射性废水中U(Ⅵ)光催化还原的影响。结果表明:MnO_(2)的引入有效拓宽了g-C_(3)N_(4)对可见光的吸收范围,抑制了光生电子与空穴复合,有利于光生电子还原反应进行,提高反应速率;针对U(Ⅵ)质量浓度50 mg/L、pH=5.5的100 mL铀标准溶液,在甲醇加入量5 mL、可见光照射120 min条件下,Mn-CN-3(MnSO_(4)质量0.05 g)对U(Ⅵ)的光催化还原率达96.3%,为纯g-C_(3)N_(4)的1.9倍;g-C_(3)N_(4)中引入MnO_(2)能有效提高光生电荷的利用率和传输速率,增强催化性能;Mn-CN复合光催化剂光学性能优异,制备方法简单且绿色环保,对放射性废水中的U(Ⅵ)的光催化还原去除效果较好。
Preparation of MnO_(2)@g-C_(3)N_(4)photocatalysts(Mn-CN)by hydrothermal method was studied.The morphology,structure and photoelectric properties of Mn-CN were analyzed.The photocatalytic reduction of U(Ⅵ)in radioactive wastewater was investigated.The results show that the introduction of MnO_(2)can widen visible light absorption range of g-C_(3)N_(4),suppress recombination of photogenerated electrons and holes,facilitate the reduction of photogenerated electrons to increase the reaction rate.For 100 mL uranium standard solution with U(Ⅵ)mass concentration of 50 mg/L and pH=5.5,under the conditions of adding 5 mL methanol,irradiating for 120 min under visible light,Mn-CN-3(the mass of MnSO_(4)is 0.05 g)photocatalytic reduction rate of U(Ⅵ)achieves 96.3%,which is 1.9 times of that of pure g-C_(3)N_(4).The introduction of MnO_(2)into g-C_(3)N_(4)can effectively improve the utilization and transmission rate of photogenerated charge,then enhance the catalytic performance.The Mn-CN composite photocatalysts has excellent optical performance,simple preparation method and environment friendly.Mn-CN shows good performance in the photocatalytic reduction of U(Ⅵ)in radioactive wastewater.
作者
王陈煜
程琳
徐琳
谢子杰
刘云海
WANG Chenyu;CHENG Lin;XU Lin;XIE Zijie;LIU Yunhai(National Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;School of Chemical Biology and Material Science,East China University of Technology,Nanchang 330013,China)
出处
《湿法冶金》
CAS
北大核心
2021年第2期148-154,共7页
Hydrometallurgy of China
基金
国家自然科学基金资助项目(21866003)
江西省科技计划人才项目(20182BCB22011)
江西省青年科学基金资助项目(20202BABL213001)。
