铜纳米粒子负载的石墨相氮化碳的制备及其光催化还原铀  

Preparation of Copper Nanoparticle-Loaded Graphitic Carbon Nitride and Photocatalytic Reduction of Uranium

作　　者：张宏森 李明 刘琦[1] 王君[1] ZHANG Hong-sen;LI Ming;LIU Qi;WANG Jun(College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001

出　　处：《核化学与放射化学》2024年第4期387-395,I0004,共10页Journal of Nuclear and Radiochemistry

基　　金：黑龙江省自然科学基金联合引导项目(LH2021E030)。

摘　　要：采用熔盐法和化学还原法分别制备了高分散性石墨相氮化碳(WSGCN)和铜纳米粒子负载的高分散性石墨相氮化碳(Cu-WSGCN)复合材料。使用傅里叶变换红外光谱仪、X射线衍射仪、X射线光电子能谱、透射电子显微镜、紫外-可见漫反射光谱、光致发光光谱等表征方法,分析光催化剂的化学结构及光电性能。结果表明,与WSGCN相比,Cu-WSGCN复合材料的光吸收范围更大,带隙更窄;铜纳米粒子与WSGCN界面存在肖特基势垒,促进了电荷的传递和光生载流子的分离,从而提高了光催化能力。当铜纳米粒子质量分数为1%时,Cu-WSGCN复合材料的铀去除率最高,为81.07%。经过三次光催化还原铀循环实验后,1%Cu-WSGCN对铀的去除率仍然可以达到75.96%。本项研究为开发高效光催化去除铀的新型材料提供了有益的参考。In this work,molten salt method was used to prepare highly dispersed graphitic carbon nitride(WSGCN),and chemical reduction method was used to load Cu nanoparticles on WSGCN to prepare Cu-WSGCN composites.FTIR,XRD,XPS,TEM,SEM,ICP-AES,UV-vis DRS,PL spectroscopy,ESR and EIS characterization methods were carried out to investigate the structure and photoelectric properties of the photocatalyst.The results show that compared with WSGCN,Cu-WSGCN has a larger light absorption range and a narrower band gap.In addition,the presence of Schottky barriers at the interface between Cu nanoparticles and WSGCN promotes charge transfer and separation of photogenerated carriers,which improves the photocatalytic ability.The uranium removal rate of CuWSGCN composite is relatively high(81.07 %) when the load of Cu nanoparticles is 1%.After three cycles of photocatalytic uranium reduction experiments,the uranium removal rate by 1%Cu-WSGCN can still reach 75.96%,which provides a useful reference for the development of novel materials with high efficiency photocatalytic removal of uranium.

关 键 词：高分散性石墨相氮化碳 光催化还原铀 铜纳米粒子 光催化复合材料 

分 类 号：TQ426[化学工程] TL212[核科学技术—核燃料循环与材料]