摘要
通过共沉淀法将四氧化三铁(Fe3O4)纳米粒子负载于凹凸棒土(ATP)制备出兼具吸附与催化性能的非均相类芬顿催化剂ATP@Fe3O4。采用SEM(扫描电子显微镜)、XRD(X射线衍射)、XPS(X射线光电子能谱)、VSM(振动磁强计)等对材料的结构进行了表征分析,并研究了其对催化过硫酸盐(PS)降解四环素(TC)的效果。结果表明,ATP@Fe3O4复合材料是活化过硫酸盐(PS)生成硫酸根自由基(SO4-)强有力的催化剂,可大幅提高PS对水溶液中四环素的降解能力。当PS浓度为10 mmol·L^-1、ATP@Fe3O4投加量为1.5 g·L^-1,其对pH=3.9的80 mg·L^-1四环素溶液的降解率在90 min可达98.75%。负载于ATP表面的Fe3O4粒子和部分溶解于水中的Fe^2+共同催化PS生成SO4^-,将TC氧化为CO2、H2O和中间体,是ATP@Fe3O4/PS体系去除四环素的主要机理。以上研究结果可为催化材料的应用提供参考。
Ferroferric oxide(Fe3O4)nanoparticles were supported on attapulgite(ATP)by co-precipitation method,and a heterogeneous Fenton-like catalyst ATP@Fe3O4 with both adsorption and catalytic properties was prepared.SEM(scanning electron microscope),XRD(X-ray diffraction),XPS(X-ray photoelectron spectroscopy),VSM(vibrating sample magnetometer)were used to characterize the structure of ATP@Fe3O4,and the degradation of tetracycline(TC)by ATP@Fe3O4 activated persulfate(PS)were studied.The results showed that the ATP@Fe3O4 composite was a powerful catalyst for the activation of persulfate to generate sulfate radicals(SO4·^-),which could greatly improve the degradation of TC in aqueous solution by PS.At the PS concentration of 10 mmol·L^-1 and the ATP@Fe3O4 dosage of 1.5 g·L^-1,the degradation rate of tetracycline solution with initial concentration of 80 mg·L^-1 and pH 3.9 reached 98.75%after 90 min.This study also discussed tetracycline removal mechanism by the ATP@Fe3O4/PS system.The Fe3O4 particles supported on the ATP surface and the partially dissolved Fe^2+ in the water catalyzed PS to form SO4·^-,which oxidized TC to CO2,H2O and intermediates.This study results provide theoretical basis and reference for the application of catalytic materials.
作者
马茜茜
吴天威
赵明月
侯建华
王圣森
封克
王小治
MA Xixi;WU Tianwei;ZHAO Mingyue;HOU Jianhua;WANG Shengsen;FENG Ke;WANG Xiaozhi(School of Environmental Science and Engineering,Yangzhou University,Yangzhou 225127,China;Jiangsu Collaborative Innovation Center for Organic Solid Waste Recycling,Nanjing 210095,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2020年第9期2463-2473,共11页
Chinese Journal of Environmental Engineering
基金
江苏省现代农业项目(BE2018328)
江苏省六大人才高峰创新团队项目(2018-TD-JNHB-012)
扬州大学优秀教学团队项目。
