氨基修饰g-C_(3)N_(4)材料的制备及其光催化去除U(Ⅵ)  

Preparation of aminomodified g-C_(3)N_(4)material and itsphotocatalytic removal of U(Ⅵ)

作　　者：许兆怡 郭翔宇 丛泓昆 柳成荫 李晓强[1] Xu Zhaoyi;Guo Xiangyu;Cong Hongkun;Liu Chengyin;Li Xiaoqiang(School of Environmental and Material Engineering,Yantai University,Yantai 264005,Shandong,China)

机构地区：[1]烟台大学环境与材料工程学院,山东烟台264005

出　　处：《工业催化》2024年第4期44-49,共6页Industrial Catalysis

摘　　要：以三聚氰胺为前驱体,焙烧制得g-C_(3)N_(4)。g-C_(3)N_(4)经过与乙二胺水热反应得到氨基修饰的g-C_(3)N_(4)/NH_(2)改性光催化剂。研究g-C_(3)N_(4)/NH_(2)改性光催化剂对废水中U(Ⅵ)的去除能力,并采用XRD、SEM、XPS、FT-IR等技术对改性样品的形貌、结构、光催化去除U(Ⅵ)能力等进行表征。结果表明,在模拟光源下,其中加入30 mL乙二胺的样品表现出最佳性能,可以在15 min将U(Ⅵ)浓度为10 mg·L^(-1)的U(Ⅵ)完全去除,150 min对U(Ⅵ)浓度为50 mg·L^(-1)的U(Ⅵ)去除率达76.5%。经表面修饰的材料表现出对U(Ⅵ)溶液优异的吸附和催化性能的原因是:水热过程使g-C_(3)N_(4)纳米片层剥离,提高了材料的比表面积;成功引入的氨基基团使g-C_(3)N_(4)提高了对U(Ⅵ)的捕获能力,提高了对光生电子的利用率,进而提高了g-C_(3)N_(4)/NH_(2)材料的催化性能。g-C_(3)N_(4)was prepared by calcination using melamine as precursor.After the hydrothermal reaction of g-C_(3)N_(4)with ethylenediamine,amino modified g-C_(3)N_(4)/NH_(2) photocatalyst was obtained.The removal capacity of U(Ⅵ)from wastewater by g-C_(3)N_(4)/NH_(2) modified photocatalyst has been studied,and the morphology,structure and photocatalytic removal capacity of the modified sample have been characterized by XRD,SEM,XPS,FT-IR.The results show that under the simulated light source,the sample with 30 mL ethylenediamine has the best performance,and it can effectively remove more than 99%U(Ⅵ)(10 mg·L^(-1))within 15 min,about 76.5%U(Ⅵ)(50 mg·L^(-1))within 150 min.The surface modified material shows excellent adsorption and catalytic properties for U(Ⅵ)solution due to the following reasons:the hydrothermal process can peel g-C_(3)N_(4)nanosheets,which increases the specific surface area of the material;the successful introduction of the amino group improves the capturing ability of U(Ⅵ)over g-C_(3)N_(4),the utilization of photogenerated electrons,and the catalytic performance of g-C_(3)N_(4)/NH_(2) materials.

关 键 词：催化化学 g-C_(3)N_(4) 光催化 吸附 氨基 U(Ⅵ) 

分 类 号：TQ426.6[化学工程] X703[环境科学与工程—环境工程]