摘要
在泡沫镍(NF)表面水热法生长了Co-MOF,经热处理制备了Co_(3)O_(4)@NF,通过扫描电镜、透射电镜、X射线衍射、X射线光电子能谱等手段对材料的形貌和结构进行了表征。将其作为阴极与过一硫酸盐(PMS)构成了电化学强化过一硫酸盐活化体系EC/Co_(3)O_(4)@NF/PMS,用于降解左氧氟沙星(LEV)。结果显示该体系在pH 3.0、PMS加入量3.5 mmol·L^(-1)、电流密度4 mA·cm^(-2)、40 min时LEV的降解率可达到95.8%,55 min时化学需氧量(COD)去除率为73.3%,显著优于没有施加电流的体系。对体系中活性物种产生机制的研究表明,电场主要通过加速Co_(3)O_(4)@NF阴极表面的Co^(3+)—CO^(2)+循环,促进了PMS活化为单线态氧1O_(2)和SO_(4)^(·-)、·OH自由基的进程,使LEV降解的非自由基途径和自由基途径均得到了加强。
Co-MOF was grown by hydrothermal method on the surface of nickel foam(NF),and Co_(3)O_(4)@NF was prepared by heat treatment.The structure and morphology of the prepared material were characterized by scanning electron microscopy,transmission electron microscopy,X-ray diffraction,and X-ray photoelectron spectroscopy.The catalyst as a cathode and peroxymonosulfate(PMS)constitute an electrochemically enhanced peroxosulfate activation system EC/Co_(3)O_(4)@NF/PMS for the degradation of levofloxacin(LEV).The experimental results show that the degradation rate can reach 95.8%in 40 min,and the COD removal is 73.3%in 55 min when pH is 3.0,PMS dosage is 3.5 mmol·L^(-1),and current density is 4 mA·cm^(-2),which are significantly better than the system without applying current.The mechanism of the generation of active species in the system was studied.It shows that electric field promotes the activation of PMS to form singlet oxygen 1O2,free radicals SO_(4)^(•-)and·OH mainly by accelerating the Co^(3+)—Co^(2+)cycle on the surface of the Co_(3)O_(4)@NF cathode.Therefore,both non-free radical and free radical pathways for LEV degradation are enhanced.
作者
李瑞康
何盈盈
卢维鹏
王园园
丁皓东
骆勇名
LI Ruikang;HE Yingying;LU Weipeng;WANG Yuanyuan;DING Haodong;LUO Yongming(School of Chemistry and Chemical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,Shaanxi,China;School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,Shaanxi,China)
出处
《化工学报》
EI
CSCD
北大核心
2023年第5期2207-2216,共10页
CIESC Journal
基金
国家自然科学基金项目(52270167)
陕西省自然科学基金项目(2019JM-390)。
关键词
自由基
催化剂活化
电化学
过硫酸盐
高级氧化
抗生素降解
单线态氧
左氧氟沙星
free radical
catalyst activation
electrochemistry
peroxymonosulfate
advanced oxidation
antibiotic degradation
singlet oxygen
levofloxacin
