氮掺杂碳负载Fe_(3)O_(4)活化过硫酸盐降解苯酚  

Activation of persulfate by nitrogen-doped carbon supported Fe_(3)O_(4) for phenol degradation

作　　者：王佩佩 杨岚 魏学锋[2] 彭淑鸽[2] 田文杰 WANG Peipei;YANG Lan;WEI Xuefeng;PENG Shuge;TIAN Wenjie(College of Environmental Engineering and Chemistry,Luoyang Institute of Science and Technology,Luoyang 471000,China;School of Chemistry&Chemical Engineering,Henan University of Science and Technology,Luoyang 471000,China)

机构地区：[1]洛阳理工学院环境工程与化学学院,河南洛阳471000 [2]河南科技大学化学化工学院,河南洛阳471000

出　　处：《化工环保》2023年第3期339-345,共7页Environmental Protection of Chemical Industry

基　　金：河南省高等学校重点科研项目(20A610001);国家自然科学基金项目(22175057);河南省科技厅科技攻关项目(182102311028)。

摘　　要：以氮掺杂碳(NC)为前驱体,采用反向共沉淀法制备了Fe_(3)O_(4)/NC复合催化剂,通过SEM、TEM、FTIR等技术手段进行了表征,考察了该催化剂活化过二硫酸盐(PDS)降解苯酚的效果和影响因素。表征结果显示纳米Fe_(3)O_(4)成功负载至NC上。实验结果表明:Fe_(3)O_(4)/NC-PDS体系对苯酚具有良好的氧化降解效果,在苯酚溶液初始质量浓度20 mg/L、Fe_(3)O_(4)/NC加入量1.0 g/L、PDS加入量2.0 g/L、pH 7、反应温度25℃的条件下,反应120 min后,苯酚去除率达100%;Fe_(3)O_(4)/NC-PDS体系降解苯酚的途径包括自由基途径和非自由基途径两种方式,主要活性物种为1O_(2);在Fe_(3)O_(4)/NC-PDS降解苯酚过程中,苯酚的C-H键首先发生断裂,经过反位取代生成苯二酚,苯二酚中的O-H键断裂后生成对苯醌,随后对苯醌中的C=C键和C-C键发生断裂,生成小分子有机酸,最后,小分子有机酸被彻底氧化降解为CO_(2)和H_(2)O。Using nitrogen-doped carbon(NC)as a precursor,the Fe_(3)O_(4)/NC composite catalyst was prepared by reverse co-precipitation method and characterized by SEM,TEM,FTIR,etc.The effect and influencing factors of phenol degradation on peroxodisulfate(PDS)activated by this catalyst were investigated.The characterization results show that nano-Fe_(3)O_(4)is loaded onto NC successfully.The experimental results show that:the Fe_(3)O_(4)/NC-PDS system has good oxidative degradation effect on phenol,and the removal rate of phenolreaches 100%under the conditions of initial phenol mass concentration 20 mg/L,Fe_(3)O_(4)/NC amount 1.0 g/L,PDS amount 0.2 g/L,pH 7.0,reaction temperature 25℃and reaction time 120 min;The pathways of phenol degradation by Fe_(3)O_(4)/NC-PDS system include free radical pathway and non-radical pathway,in which the main active species is 1O_(2);During the process of phenol degradation by Fe_(3)O_(4)/NC-PDS system,the C—H bond of phenol first breaks and undergoes a reverse substitution to generate dihydroxybenzene,the O—H bond of dihydroxybenzene breaks to generate p-benzoquinone,then the C=C bond and C—C bond of p-benzoquinone break to form small molecular organic acids,finally,the small molecular organic acids are thoroughly oxidized and degraded to CO_(2) and H_(2)O.

关 键 词：氮掺杂碳 Fe_(3)O_(4) 过硫酸盐 高级氧化 苯酚 

分 类 号：X703[环境科学与工程—环境工程]