In recent years,chloroquine phosphate(CQP)has been widely used as a specific drug for the treatment of COVID-19.Even after the epidemic ended,it still plays an important role because of its anti-inflammatory and anti-malaria capabilities.The widespread use of chloroquine phosphate poses serious potential hazards to the environ-ment.Utilizing waste wood chips as resources,a nickel ferrite loaded biochar composite material(NiFe2O4@BC)with magnetic recovery was prepared by co precipitation anaerobic calcination method,and study the performance of activating peroxymonosulfate(PMS)to degrade CQP.The compositional structure,surface functional groups,and degree of graphitization of the NiFe2O4@BC composite were analyzed using various characterizations.Compared with unmodified fir sawdust biochar(BC),the loading of magnetic NiFe2O4 on the biochar resulted in an increase in the degree of graphitization of the composite,and an increase in the number of defective active sites,which led to a tremendous increase in the effectiveness of the removal of CQP.The effects of NiFe2O4@BC dosing,PMS concentration,initial pH of the solution,inorganic anions,and humic acid in the degradation of CQP were mainly investigated.Research shows that when NiFe2O4@BC under the conditions of 0.5 g/L dosage,1.0 mmol/L PMS concentration,and 10 mg/L CQP concentration,the CQP removal rate reaches 89%in 120 min.The degrada-tion of CQP is more favorable under acidic or alkaline conditions,and humic acid(HA)has a promoting effect on the degradation of CQP by NiFe2O4@BC-activated PMS.Quenching experiments confirm that·OH and 1O2 generated by the radical and non-radical pathways dominated the degradation of CQP by the NiFe2O4@BC/PMS system.Under the same conditions,it can achieve more than 80%degradation effect for many kinds of pollutants.In addition,the efficiency of CQP removal by activated PMS could still reach about 74%after NiFe2O4@BC was recycled 5 times.This study provides new strategies and reference significance for the efficient and green resource utilization of discarded fir sawdust.
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