基于蓝藻生物炭粒子电极的3维电化学系统对磺胺甲恶唑的降解OA北大核心CSTPCD

Following the concept of"treating waste using waste",this study uses cyanobacteria in the Tai Lake after mechanical salvage as raw materials to prepare environmentally friendly cyanobacteria-based biochar through high temperature,oxygen-limited pyrolysis,and acid/alkali treatment.The obtained biochar is then utilized as particle electrodes in a three-dimensional electrochemical system(3DES)to remove the typical antibiotic sulfamethoxazole(SMX)from water.After pyrolysis and acid/alkali treatment,the biochar exhibits a larger specific surface area and a more abundant pore structure,which enhances the enrichment of SMX on the surface of particle electrodes.The original iron and nitrogen ele-ments in cyanobacteria form a doping structure in the resulting biochar,significantly enhancing the generation of reactive oxygen species and im-proving the removal and mineralization efficiencies of SMX.The optimized biochar is prepared at a pyrolysis temperature of 700 ℃ and sub-sequently modified using alkali.The optimized operational conditions of 3DES involve a current of 600 mA,a pH of 6,a particle electrode dosage of 1.00 g/L,a water flow rate of 300 mL/min,and an electrolyte Na2SO4 concentration of 50 mm.The removal efficiency for SMX can exceed 96％within 120 min,and the total organic carbon(TOC)removal efficiency can reach 94％after 6 h.Mechanism studies indicated that indirect oxidation,accounting for 84.32％of SMX degradation,is more significant than direct oxidation,which accounts for 15.68％;both HO·and SO4·-are detected in the system,yet neither 1O2 nor O2·-is detected;compared to SO4·-,HO in indirect oxidation,accounting for 87.31％,plays a dom-inant role in the 3DES.After six cycles of operation,the degradation efficiency of 3DES for SMX removal remains above 85％.This work provides technical support and a theoretical basis for applying 3DES based on cyanobacterial biochar particle electrodes in water treatment.