壳聚糖改性的Co-Fe双金属催化剂高效催化过一硫酸盐降解罗丹明B  

Chitosan-modified Co-Fe bimetallic catalyst efficiently catalyzes the degradation of rhodamine B by peroxymonosulfate

作　　者：宋伟强 吕小凡 张淼[1] 王震 SONG Weiqiang;LÜXiaofan;ZHANG Miao;WANG Zhen(College of Environmental Science and Engineering,Yangzhou University,Yangzhou 225000;Tianjin Key Laboratory of Aquatic Science and Technology,School of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384)

机构地区：[1]扬州大学环境科学与工程学院,扬州225000 [2]天津城建大学环境与市政工程学院,天津市水质科学与技术重点实验室,天津300384

出　　处：《环境科学学报》2024年第12期105-117,共13页Acta Scientiae Circumstantiae

基　　金：天津市水质科学与技术重点实验室开放研究基金资助项目(No.TJKLAST-PT-2021-06)。

摘　　要：以过一硫酸盐(Peroxymonosulfate,PMS)为基础的高级氧化技术(AOPs)是一种有效降解水中有机污染物的方法,传统过渡金属活化PMS降解污染物的方法存在金属离子浸出问题,会对环境造成二次污染.本研究采用壳聚糖碳化微球(Chitosan Carbonized Microspheres,CCM)负载具有核壳结构的Co Fe合金@氮掺杂石墨碳(Co Fe@NC),从而制备出一种可回收、稳定、催化活性较好的催化剂(Co Fe@NC/CCM).以罗丹明B为污染物考察催化材料的性能,同时探究影响因素.实验结果表明:在p H=4.78(未调节)、25℃下,100 m L浓度为15 mg·L^(-1)的Rh B溶液中,当PMS投加量为0.1 g·L^(-1)、催化剂投加量为0.35 g·L^(-1)时,Co Fe@NC/CCM活化PMS降解Rh B的降解率可达99.53%.进一步探究Co Fe@NC/CCM活化PMS降解Rh B机理,自由基淬灭实验结果表明,Co Fe@NC/CCM活化PMS降解罗丹明B过程中非自由基(^(1)O_(2))起主导作用,自由基(·OH、SO_(4)^(·-))起协同作用,经过使用电感耦合等离子体质谱仪对反应过程中及反应结束后的溶液进行详细检测,并未发现任何金属离子浸出的迹象.研究表明Co Fe@NC/CCM是一种绿色、性能较高的催化剂.Advanced oxidation processes(AOPs)based on peroxymonosulfate(PMS)is an effective method for the degradation of organic pollutants in water.Traditional transition metal-activated PMS systems for pollutant degradation is afflicted by metal ion leaching issues.In this study,we prepared a recyclable,stable,and highly catalytically active catalyst,Co Fe@NC/CCM,by loading chitosan carbonized microspheres(CCM)with a core-shell structured Co Fe alloy@nitrogen-doped graphite carbon(Co Fe@NC).Rhodamine B(Rh B)was used as the target pollutant to assess the performance of the catalyst as well as the influencing factors.Experimental results revealed that at a p H of 4.78(unadjusted)and at 25℃,with a PMS dosage of 0.1 g·L^(-1)and a catalyst dosage of 0.35 g·L^(-1),the degradation efficiency of Rh B reached 99.53%when using Co Fe@NC/CCM activated PMS in a 100 m L solution whit a concentration of 15 mg·L^(-1).Further investigation into the mechanism of Rh B degradation by Co Fe@NC/CCM activated PMS indicated that nonradical species(^(1)O_(2))dominant,while radical species(·OH,SO_(4)^(·-))acted synergistically.No leaching of metal ions was observed in the reaction solution during or after the process,as confirmed by liquid chromatography.The study demonstrates that Co Fe@NC/CCM is a green and highly efficient catalyst.

关 键 词：过一硫酸盐 单线态氧 罗丹明B 

分 类 号：X703[环境科学与工程—环境工程]