生物质碳热还原制备铁碳复合催化剂的理化性质及催化氧化降解刚果红的性能研究  

Preparation and characterization of the biochar supported iron composite catalyst through carbothermal process for catalytic oxidation of Congo red

作　　者：王娥 李导玉 钱锴 程佩 李淑萍 孔令军 WANG E;LI Daoyu;QIAN Kai;CHENG Pei;LI Shuping;KONG Lingjun(293 Corps of Guangdong Nuclear Industry Geology Bureau,Guangzhou Guangdong 510800;Ecological and Environment Monitoring Center of Heyuan,Heyuan Guangdong 517001;Huadu Branch of Ecological Environment Bureau of Guangzhou,Guangzhou Guangdong 510801;Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources,School of Environmental Science and Engineering,Guangzhou University,Guangzhou Guangdong 510006)

机构地区：[1]广东省核工业地质局二九三大队,广东广州510800 [2]河源市生态环境监测监控中心,广东河源517001 [3]广州市生态环境局花都分局,广东广州510801 [4]广州大学环境科学与工程学院,广东省放射性核素污染控制与资源化重点实验室,广东广州510006

出　　处：《环境污染与防治》2024年第1期20-25,共6页Environmental Pollution & Control

基　　金：国家自然科学基金面上项目(No.21976042);广东省科技计划项目(No.2021A0505030076);广东省自然科学基金面上项目(No.2019A1515011543)。

摘　　要：铁元素作为环境广泛存在的元素,由于多价态特征而被广泛应用于催化氧化降解有机污染物,主要有零价铁和铁硫化物。以可溶性淀粉为碳源,FeSO 4为铁源,通过碳热还原法合成多孔碳负载纳米零价铁和Fe_(0.96) S的复合催化剂。利用X射线衍射(XRD)和扫描电子显微镜(SEM)探索铁元素的形态和形貌在碳热还原中的变化规律,研究其催化活化过硫酸钾(KPS)氧化降解水中染料刚果红(CR)的活性,分析影响活化KPS氧化降解CR效率的主要因素。结果表明,在碳化温度为800℃时,得到一种多孔碳负载纳米零价铁和Fe_(0.96) S的复合催化剂。当CR初始质量浓度为500 mg/L、催化剂投加量为1 g/L时,30 min内CR的降解率可达约100%。CR降解过程会产生大量的小分子有机酸中间产物,导致反应过程溶液的pH逐渐降低至约3。因此,通过碳热还原法能获得多孔碳负载纳米零价铁和Fe_(0.96) S的复合催化剂,可广泛应用于催化氧化去除水中有机污染物。Iron,as one of the environment friendly and compatible elements,was widely used for catalytic oxidation of organic pollutants due to the variety valence.The catalytic species contained zero valent ion and Fe.In this work,a kind of porous char supported iron catalyst containing zero valent ion and Fe_(0.96) S were prepared under carbothermal reduction process,in which the soluble starch and FeSO 4 were conducted as carbon and iron precursors,respectively.The micromorphology and phase of the iron during carbothermal reduction process were characterized by XRD and SEM analysis.The catalytic activity of KPS activation for Congo red(CR)degradation was conducted in a batch experiments.The main factors determined the CR degradation efficiency was reported.A kind of porous char supported zero valent iron and Fe_(0.96) S was prepared under 800℃.The CR degradation efficiency attained to about 100%within 30 min in the presence of the catalyst with a dosage of 1 g/L and the initial CR concentration of 500 mg/L.Organic acid with small molecular was formed during the CR degradation,resulting in the decreased pH value to about 3.Therefore,the porous char supported zero valent iron and Fe_(0.96) S catalyst could be successfully prepared for activating KPS to degrade the CR with favorable activity,which is also promising in catalytic degradation of organic pollutants in wastewater.

关 键 词：铁 催化氧化 过硫酸钾 刚果红 

分 类 号：X703[环境科学与工程—环境工程] TQ426[化学工程]