PERFORMANCE AND MECHANISM OF CSB-BOC ACTIVATED PMS FOR REMOVAL OF TETRACYCLINE HYDROCHLORIDE IN WATER IN SLOW-GATHERING AREAS OF RIVER
Biochar-supported Bi2O3-Bi7.90Mo0.10O12.15/Cu4S7(CSB-BOC)composites were prepared by impregnation-post pyrolysis method and its lattice structure,morphology,surface elements,and chemical morphology were characterized and analyzed by XRD,SEM,XPS and other technologies.Subsequently,the performance and mechanism of CSB-BOC activated peroxymonosulfate(PMS)to remove emerging contaminants were explored.Tetracycline hydrochloride(TC),a typical emerging contaminant,was used as the target pollutant,and the effects of different catalyst reaction systems,PMS concentration,anions,humic acid(HA)and pH on pollutant's removal were studied;the stability of CSB-BOC recycling and the feasibility of removing pollutants in slow-gathering areas of river water were investigated;the phytotoxicity of TC degradation intermediates was evaluated.The results showed that CSB-BOC-5-1 had the best catalytic performance.When the concentration of CSB-BOC-5-1 was 0.2 g/L,the concentration of PMS was 0.2 g/L,the concentration of TC was 20 mg/L,pH=6.8,and the temperature was 23 ℃,the removal rate of TC reached 95％within 60 min at room temperature,2.79 times that of coconut shell carbon(CSB)+PMS.The degradation efficiency after four degradation cycles only decreased by 10 percentage points.The results of the radical quenching experiment and electron spin resonance(ESR)showed that 1O2 was the main active species for TC degradation.The degradation products of TC were identified by LC-MS,and two possible degradation pathways were proposed.The phytotoxicity test and the actual water tests showed that the treatment solution of CSB-BOC+PMS for TC degradation was non-toxic or low toxic,and it showed good effect when being used to remove emerging contaminants in the water samples of slow-gathering areas of a river.
biocharperoxymonosulfateemerging contaminantsimpregnation-post pyrolysisslow-gathering areas
何西、刘晨、李婧璐、陈明、B.Larry LI
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重庆交通大学,重庆 400074
中国科学院重庆绿色智能技术研究院,重庆 400714
中国科学院大学重庆学院,重庆 400714
Department of Civil and Environmental Engineering,Imperial College London,London SW7 2BU,UK
Ecological Complexity and Modeling Laboratory,University of California,California CA 92521-0124,USA
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