Degradation of Tetracycline with Persulfate Activated by Cu-Loofah Biochar

WANG Qi; WANG Wei; LI Qiang; HUANG Yi; CHEN Shi; XIA Qiang; CHEN Gang

doi:10.19672/j.cnki.1003-6504.1746.22.338

Abstract：The copper loaded loofah biochar composite(Cu-LBC)which was used to activate persulfate(PS)to degrade tetracycline(TC),were prepared in the laboratory by the method of chemical impregnation and high temperature carboniza-tion,and the experimental study with Cu-LBC showed that when the reaction temperature was at 25 ℃,initial pH being 7,and dosage of PS and Cu-LBC being respectively 0.2 g/L and 0.6 g/L,TC removal rate could reach 87.26％±3.36％within 40 minutes;in addition,the pH adaptability of this catalytic system was excellent,and the influence of coexisting anions on the degradation performance was negligible;the high efficient catalytic degradation ability of the system was owing to the catalyst that was greatly reducing the activation energy of the reaction(Ea=4.51 kJ/mol).The catalyst was thereby applied to the degradation of TC contained in the water samples which were taken from some local stream and lakes,the results also showed its high TC-removing ability.Furthermore,the free-radical quenching experiment and electron paramagnetic resonance(EPR)analysis revealed that the dominant free radicals in the system were SO4·-and·OH;the examination using FTIR and XRD showed that copper in the biochar composite mainly existed in the form of Cu+,and the functional groups on the surface of Cu-LBC determined its excellent catalytic performance.