Cerium-based metal-organic framework-modified natural mineral vermiculite for photocatalytic nitrogen fixation under visible-light irradiation  

作　　者：Sixiao Liu Tianyi Wang Lei Zhang Chengyin Wang Huan Pang 

机构地区：[1]College of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225002,China

出　　处：《Chinese Chemical Letters》2025年第3期177-181,共5页中国化学快报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.21978251,22102141 and U1904215);Natural Science Foundation of Jiangsu Province(No.BK20200044).

摘　　要：In order to protect the environment and economize energy,a nitrogen-fixing photocatalyst,VMCeact,is investigated in this work.This catalyst is prepared from a natural mineral,vermiculite,and modified by Ce-based metal-organic framework,Ce-UiO-66.Vermiculite was treated with formic acid;thus,Ce-UiO-66 particles grew in-situ on vermiculite;then,Ce-UiO-66 particles were activated by ultraviolet irradiation.The vermiculite absorbed visible light with a narrow band gap,and transferred photogenerated electrons to the active sites on Ce-UiO-66.Moreover,the lamella structure of vermiculite protected Ce-UiO-66 during photocatalytic process.Therefore,with only 45.92 wt%of Ce-UiO-66,the nitrogen fixation performance of VMCeact was 2.29 times that of pure activated Ce-UiO-66 particles under 455nm light irradiation(apparent quantum efficiency of 4.49%),and retained at least 96.05%performance after 7×24 h of photocatalytic reaction.This cost-reduced,efficient and stable photocatalyst has the opportunity to facilitate environmentally friendly ammonia production.

关 键 词：Metal-organic frameworks VERMICULITE Nitrogen fixation VISIBLE-LIGHT LOW-COST 

分 类 号：O643.36[理学—物理化学]