FeAl-LDH@FeS_(x)-NBC光催化降解水中的对氨基苯甲酸  

Photocatalytic Degradation of p-Aminobenzoic Acid in Water by FeAl-LDH@FeS_(x)-NBC

作　　者：王琬玥 濮宇豪 夏睿笛 黄嘉诚 任新[1] 赵雪松[1] WANG Wanyue;PU Yuhao;XIA Ruidi;HUANG Jiacheng;REN Xin;ZHAO Xuesong(College of Engineering,Jilin Normal University,Siping 136000,Jilin Province,China)

机构地区：[1]吉林师范大学工程学院,吉林四平136000

出　　处：《吉林大学学报(理学版)》2025年第2期647-654,共8页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:52270038);吉林省科技厅面上项目(批准号:20230101220JC;20220101073JC)。

摘　　要：针对对氨基苯甲酸(PABA)结构稳定且难以分解,长期存在会导致水体污染的问题,采用水热法制备以生物质炭(BC)为基底的三维层状FeAl-LDH@FeS_(x)-NBC催化剂,构建光催化降解体系,降解水中的PABA.结果表明:FeAl-LDH@FeS_(x)成功负载在掺杂N元素的生物质炭(NBC)上;当催化剂用量为0.3 g/L,pH=5时,光催化体系降解PABA的效果最佳,210 min后去除率可达95.4%;在5次循环实验后,FeAl-LDH@FeS_x-NBC仍对PABA有较高的去除率,即可重复利用率较好.在该体系中主要降解作用的自由基为超氧根自由基(O·_(2)^(-))和光生空穴(h^(+)).光照射使催化剂表面光生电子(e^(-))与h^(+)分离,e^(-)被氧气捕获生成(O·_(2)^(-),h^(+)被氢氧根捕获生成羟基自由基(·OH),进而促进整个体系的活性组分产生.Aiming at the problem of the structural stability and difficulty in decomposition of p-aminobenzoic acid(PABA),its long-term existence could lead to water pollution,we prepared a three-dimensional layered FeAl-LDH@FeS_(x)-NBC catalyst based on biochar(BC)by using hydrothermal method,and constructed photocatalytic degradation system to degrade PABA in water.The results show that FeAl-LDH@FeS_(x)is successfully loaded onto biochar doped with N element.When the catalyst dosage is 0.3 g/L and the pH=5,the photocatalytic system exhibits the best degradation effect of PABA,with a removal rate of 95.4%after 210 min.After 5 cycle tests,FeAl-LDH@FeS_(x)-NBC still has a high removal rate of PABA,indicating good repeatable utilization.The main free radicals for degradation in this system are superoxide radical((O·_(2)^(-)),photogenerated hole(h^(+)),light irradiation causes the separation of photogenerated electrons(e-)and h^(+)on the catalyst surface,where e-is captured by oxygen to form(O·_(2)^(-)and h^(+)is captured by hydroxide ions to form hydroxyl radical(·OH),thereby promoting the generation of active components in the entire system.

关 键 词：对氨基苯甲酸 FeAl-LDH@FeS_(x)-NBC 光催化降解体系 

分 类 号：X703[环境科学与工程—环境工程]