聚乙烯亚胺修饰坡缕石/CaIn_(2)S_(4)复合材料光催化降解甲基橙  

Photocatalytic degradation of methyl orange by polyethyleneimine modified palygorskite/CaIn_(2)S_(4)composites

作　　者：文娜 胡美凤 李德丽 常玥[1,2,3] 查飞[1] WEN Na;HU Meifeng;LI Deli;CHANG Yue;ZHA Fei(College of Chemistry&Chemical Engineering,Northwest Normal University,Lanzhou 730070,Gansu,China;Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education,Lanzhou 730070,Gansu,China;Key Laboratory of Polymer Materials of Gansu Province,Lanzhou 730070,Gansu,China)

机构地区：[1]西北师范大学化学化工学院,甘肃兰州730070 [2]生态环境相关高分子材料教育部重点实验室,甘肃兰州730070 [3]甘肃省高分子材料重点实验室,甘肃兰州730070

出　　处：《精细化工》2023年第5期1055-1064,共10页Fine Chemicals

基　　金：国家自然科学基金(21865031)。

摘　　要：以聚乙烯亚胺(PEI)修饰的坡缕石(PGS)[记为PGS(PEI)]、CaIn_(2)S_(4)前驱体为原料,一锅水热法制备了PGS(PEI)/CaIn_(2)S_(4)复合材料,通过XRD、SEM、N2吸附-脱附、UV-VisDRS及PL表征了复合材料的物化性能,阐述了该复合材料的生长机制,测试了PGS(PEI)/CaIn_(2)S_(4)复合材料光催化降解多种染料的可行性。结果表明,PGS(PEI)镶嵌在纳米花CaIn_(2)S_(4)的内部,PGS(PEI)质量分数为60%的PGS(PEI)/CaIn_(2)S_(4)复合材料[记为60%PGS(PEI)/CaIn_(2)S_(4)]的比表面积、孔容、孔径分别为138.59 m^(2)/g、0.49 cm^(3)/g、14.21 nm。PGS(PEI)与CaIn_(2)S_(4)之间的内置电场及PEI对光生电子的迁移提高了PGS(PEI)/CaIn_(2)S_(4)光生载流子的分离率,可见光照射下60%PGS(PEI)/CaIn_(2)S_(4)对甲基橙的光催化降解活性高于CaIn_(2)S_(4),光照60 min,对甲基橙的降解率为96.9%,·O_(2)^(-)为光降解反应中的主要活性基团。PGS(PEI)/CaIn_(2)S_(4)composites were synthesized from one-pot hydrothermal reaction of polyethyleneimine(PEI)modified palygorskite[named as PGS(PEI)]and CaIn_(2)S_(4)precursor,and characterized by XRD,SEM,N2 adsorption-desorption,UV-Vis DRS and PL for physicochemical property analysis.The growth mechanism of the composites obtained was then described,followed by evaluation on photocatalytic degradation of various dyes.The results showed that PGS(PEI)/CaIn_(2)S_(4)displayed a morphology of PGS(PEI)embedded in flower-like nano-CaIn_(2)S_(4).The 60%PGS(PEI)/CaIn_(2)S_(4)(PGS(PEI)/CaIn_(2)S_(4)with a PGS(PEI)mass fraction of 60%)exhibited a specific surface area of 138.6 m^(2)/g,a pore volume 0.49 cm^(3)/g and pore diameter of 14.20 nm,respectively.The built-in electric field between PGS(PEI)and CaIn_(2)S_(4)and the photoelectron transformation by PEI lead to enhancement of photogenerated carrier separation rate.Under visible light irradiation,60%PGS(PEI)/CaIn_(2)S_(4)could have 96.9%of methyl orange degraded in 60 min,indicating higher photocatalytic activity in comparison to un-modified CaIn_(2)S_(4).The superoxide free radicals(·O_(2)^(-))played an important role in the photodegradation process.

关 键 词：聚乙烯亚胺 坡缕石 CaIn_(2)S_(4) 复合材料 光催化降解 甲基橙 

分 类 号：O644.1[理学—物理化学] X703[理学—化学] O646.36[环境科学与工程—环境工程]