介孔碳负载铁钴合金活化过一硫酸盐降解酸性橙7  

Peroxymonosulfate activation by iron-cobalt alloy supported on mesoporous carbon for the degradation of acid orange 7

作　　者：黄梦婷 向平[1] 周元[1] 周容生 林庞墅 HUANG Mengting;XIANG Ping;ZHOU Yuan;ZHOU Rongsheng;LIN Pangshu(College of Environment and Ecology,Chongqing University,Chongqing 400045)

机构地区：[1]重庆大学环境与生态学院,重庆400045

出　　处：《环境科学学报》2024年第5期81-91,共11页Acta Scientiae Circumstantiae

基　　金：“海洋环境安全保障与岛礁可持续发展”重点专项(No.2021-01)。

摘　　要：采用蒸发诱导自组装法制备了铁钴掺杂介孔碳复合材料(FeCo_(2)-MC).通过SEM、TEM、XRD、FTIR、BET及XPS对FeCo_(2)-MC进行表征,考察了催化剂投加量、过一硫酸盐(PMS)浓度、初始pH、环境温度和水体中常见阴离子及有机物对酸性橙7(AO7)去除的影响.结果表明,FeCo_(2)-MC具有多孔结构,铁钴合金以球状颗粒形式均匀分布在介孔碳上.在最佳条件下(FeCo_(2)-MC 0.2 g·L^(-1)、PMS 1 mmol·L^(-1)、AO720 mg·L^(-1)、pH=7、T=25℃),30 min内AO7几乎能被完全降解.淬灭实验和XPS测试结果表明,自由基(SO_(4)^(·-)和·OH)与非自由基(^(1)O_(2))在AO7的降解过程中均发挥着重要作用.紫外-可见光光谱和LC-MS分析说明,A07分子经过脱氨、脱硫及氧化等反应生成有机中间体,并部分被完全矿化为CO_(2)和H_(2)O.Iron and cobalt doped mesoporous carbon composites(FeCo_(2)-MC) were prepared by evaporation induced self-assembly method.The FeCo_(2)-MC was characterized by SEM,TEM,XRD,FTIR,BET and XPS.The effects of catalyst dosage,peroxymonosulfate(PMS) concentration,initial pH,ambient temperature,common anions and organic matter on the removal of acid orange 7(AO7) were investigated.The results showed that FeCo_(2)-MC possessed a porous structure and the iron-cobalt alloys were uniformly distributed on mesoporous carbon in the form of spherical particles.Under the optimal conditions(FeCo_(2)-MC 0.2 g·L^(-1),PMS 1 mmol·L^(-1),A07 20 mg· L^(-1),pH=7,T-25℃),AO7 could be almost completely degraded in 30minutes.Results of quenching experiment and XPS shown that both radicals(SO_4^(·-) and ·OH) and non-radical(^(1)O_(2)) played an important role in the degradation of AO7.The analysis of UV-Vis spectra and LC-MS illustrated that A07 molecules were converted to organic intermediates through reactions such as deamination,desulphurisation and oxidation.Finally,some of the intermediate compounds were entirely mineralized to CO_(2) and H_(2)O.

关 键 词：铁钴合金 介孔碳 过一硫酸盐 酸性橙7 

分 类 号：X703[环境科学与工程—环境工程]