Fe^(3+)/Fe^(2+)对MNPs催化芬顿反应和回收性能的影响  

Effect of Fe^(3+)/Fe^(2+)on Catalytic Fenton Reaction and Recycling Performance of MNPs

作　　者：王浩羽 高诗 张大奕 孙建鸿 宋建昕 彭铮 谢恩 WANG Hao‑yu;GAO Shi;ZHANG Da‑yi;SUN Jian‑hong;SONG Jian‑xin;PENG Zheng;XIE En(College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083,China;College of New Energy and Environment,Jilin University,Changchun 130021,China;Rural Energy and Environment Agency,Ministry of Agriculture and Rural Affairs,Beijing 100125,China;Zhuzhou Urban Drainage Co.Ltd.,Zhuzhou 412005,China)

机构地区：[1]中国农业大学水利与土木工程学院,北京100083 [2]吉林大学新能源与环境学院,吉林长春130021 [3]农业农村部农业生态与资源保护总站,北京100125 [4]株洲市城市排水有限公司,湖南株洲412005

出　　处：《中国给水排水》2023年第21期104-110,共7页China Water & Wastewater

基　　金：国家重点研发计划项目(2021YFE0192500)。

摘　　要：采用磁性纳米颗粒(MNPs)催化类芬顿反应来降解有机物已被广泛应用,但关于Fe^(3+)/Fe^(2+)(物质的量之比)对磁性纳米颗粒催化性能和磁回收性能差异的研究较少。基于此,通过共沉淀法合成了3种不同Fe^(3+)/Fe^(2+)的MNPs,并用其催化类芬顿体系降解溴化乙锭(EtBr),分析pH、催化剂投加量和H_(2)O_(2)投加量对系统催化效率的影响,并讨论了3种MNPs的重复利用性能。结果表明,pH对系统的催化效率有显著影响(p<0.05),同时发现在碱性条件下EtBr也出现了一定程度的降解(降解率为38.48%)。Fe^(3+)/Fe^(2+)为2∶1的MNPs(MNPs-A)综合性能最佳,在最佳实验条件下(pH≈3,MNPs投加量为0.5 g/L,H_(2)O_(2)投加量为0.05 mol/L),4 h内EtBr的降解率最高可达98.97%,且降解过程符合一级动力学(k=1.1439 h-1,r2=0.9987)。经过5次回收循环,MNPs-A依然保持65.49%的催化效率。Magnetic nanoparticles(MNPs)catalyzed Fenton‑like reaction has been widely applied in degrading organic compounds.However,there are few studies on the difference between the catalytic performance and magnetic recovery performance of magnetic nanoparticles under different Fe^(3+)/Fe^(2+)ratios(molar ratio).In this study,three kinds of MNPs with different Fe^(3+)/Fe^(2+)ratios were synthesized by co‑precipitation method,and then were used as catalysts to degrade ethidium bromide(EtBr)in a Fenton‑like system.The effects of pH,catalyst dosage and H_(2)O_(2)dosage on the catalytic efficiency of the system were analyzed,and the reuse performance of the three MNPs was discussed.pH had a significant effect on the catalytic efficiency of the system(p<0.05),and EtBr was also degraded to a certain extent under alkaline conditions(degradation rate was 38.48%).MNPs with Fe^(3+)/Fe^(2+)ratio of 2∶1(MNPs‑A)had the best comprehensive performance.Under the optimal conditions(pH of 3,MNPs dosage of 0.5 g/L and H_(2)O_(2)dosage of 0.05 mol/L),the degradation rate of EtBr reached 98.97%within 4 h,and the degradation process conformed to the first‑order kinetics(k=1.1439 h-1,r2=0.9987).The MNPs‑A still maintained a catalytic efficiency of 65.49%after five recovery cycles.

关 键 词：Fe^(3+)/Fe^(2+) 磁性纳米颗粒 芬顿反应 溴化乙锭 反应动力学 

分 类 号：TU992[建筑科学—市政工程]