Micrometer-sized NiOOH hierarchical spheres for enhanced degradation of sulfadiazine via synergistic adsorption and catalytic oxidation in peroxymonosulfate system  

作　　者：Cong Lyu Lu Zhang Dan He Boyuan Su Ying Lyu 

机构地区：[1]Key Lab of Groundwater Resources and Environment,Ministry of Education,Jilin University,Changchun 130026,China [2]Jilin Provincial Key Laboratory of Water Resources and Environment,Jilin University,Changchun 130026,China [3]Department of Chemistry and Environmental Science,New Jersey Institute of Technology,Newark,NJ 07102,United States

出　　处：《Chinese Chemical Letters》2022年第2期930-934,共5页中国化学快报（英文版）

基　　金：funded by the National Key R&D Program of China (No.2018YFC0406503);the National Natural Science Foundation of China (No.52070086);the Natural Science Foundation of Jilin Provincial Science & Technology Department (No.20200403034SF);the Open Project Program of Engineering Research Center of Groundwater Pollution Control and Remediation,Ministry of Education。

摘　　要：As an antibiotic,sulfadiazine has posed a serious threat to humans and ecosystems due to its chronic toxicity.The advanced oxidation processes (AOPs) via heterogeneous catalytic activation of peroxymonosulfate (PMS) have significant potential for the degradation of antibiotics.However,there are multiple restrictions including non-specifically binding to target contaminants,which would deplete oxidation capacity,and lacking energy effectiveness due to inefficient utilization of reactive oxygen species (ROS).To overcome these obstacles,we adopted the“bait-hook&destroy”strategy in this study.Herein,we synthesized a novel micrometer-sized Ni OOH hierarchical spheres assembled from nanosheets,which have relatively large specific surface areas and yield specified cavities to“bait-hook”sulfadiazine and PMS onto the surface cavities.This process was further conductive to effective generation of ROS and subsequently“destruction”of sulfadiazine with elevated mass transformation rate.20.4%of sulfadiazine can adsorb to Ni OOH surface in less than 30 min (0.0051 min^(-1)),and then sulfadiazine was completely degraded in 90min intervals in the Ni OOH/PMS system.The degradation rate constant (k=0.0537 min^(-1)) was about5.3,2.5 and 2.2 times higher than that in Ni_(2)O_(3)/PMS,NiO/PMS and Ni(OH)_(2)/PMS system,respectively.This was ascribed to the synergistic catalytic oxidation and adsorption process occurred on the surface of Ni OOH.Appreciably,there were both non-radicals (^(1)O_(2)) and radicals (O_(2)^(·-)and SO_(4)^(·-)) involved in the Ni OOH/PMS system,and^(1)O_(2)was distinguished as the dominated ROS for degradation of sulfadiazine.This study provides a novel strategy via synergistic adsorption and catalytic oxidation,and indicates that the micrometer-sized Ni OOH hierarchical sphere as heterogeneous catalyst is an attractive candidate for potential application of the SR-AOPs technology in water treatment.

关 键 词：Nickel oxyhydroxide PEROXYMONOSULFATE Sulfate radical Singlet oxygen SULFADIAZINE 

分 类 号：X703[环境科学与工程—环境工程] TQ426[化学工程]