Synthesis of a halloysite/MnFe_(2)O_(4)heterogeneous Fenton catalyst for the efficient degradation of organic pollutants  

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作  者:Xiaoyu Jiang Sikai Zhao Yaozhong Qi Jiafang Zhang Wenbao Liu Qiang Zhao Yanbai Shen 

机构地区:[1]School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China

出  处:《International Journal of Minerals,Metallurgy and Materials》2025年第5期1270-1282,共13页矿物冶金与材料学报(英文版)

基  金:supported by the National Natural Science Foundation of China(No.52274255);the Fundamental Research Funds for the Central Universities(Nos.N2301003,N2201008,N2201004,and N2301025);the Liaoning Revitalization Talents Program(No.XLYC2202028);the Postdoctoral Foundation of Northeastern University,the Young Elite Scientists Sponsorship Program by CAST(No.2022QNRC001);the China Postdoctoral Science Foundation(No.2022M720025).

摘  要:To address the limitations associated with conventional Fenton processes,which often exhibit a restricted pH range and present challenges in terms of catalyst recovery and second pollutant,magnetic heterogeneous halloysite(HNT)/MnFe_(2)O_(4)catalysts were optimally synthesized,which could achieve 90%removal efficiency for 50 mg/L methylene blue(MB)at pH 4-10 and have high hydrogen peroxide(H_(2)O_(2))utilization efficiencies.In addition,the catalysts could be easily separated from a solution through magnetic separation.The degradation efficiency of MB exhibited remarkable resilience against common aqueous interferents with anions(NO_(3)^(-),Cl^(-),SO_(4)^(2-))and humic acid,demonstrating negligible inhibitory effects.Notably,carbonate species(CO_(3)^(2-)and HCO_(3)^(-))even elicited a promotional effect on the catalytic process.Furthermore,the removal efficiency of MB only decreased by less than 10%in the fifth cycle compared with that of a fresh catalyst.Furthermore,the HNT/MnFe_(2)O_(4)catalyst effectively degraded various organic pollutants,such as benzohydroxamic acid,xanthate,and eosin Y.The excellent catalytic performance of the catalysts was attributed to the synergistic effects between HNT and MnFe_(2)O_(4).The electron paramagnetic resonance spectra and quenching experiments indicated that the main reactive oxygen species that participated in the degradation process were·OH and·O_(2)^(-).·OH directly attacked MB molecules,and·O-2 accelerated the reduction of metal ions.Therefore,the catalysts showed considerable potential for organic pollutant degradation.This study provides valuable insights into the synthesis of novel catalysts and their practical applications in organic wastewater purification.

关 键 词:heterogeneous Fenton DEGRADATION HALLOYSITE manganese ferrite bimetallic cycle 

分 类 号:X703[环境科学与工程—环境工程]

 

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