Tributyl phosphate modified biochar activated PMS for degradation of bisphenol A
Using bisphenol A(BPA)as the target pollutant,phosphorus-doped biochar(P-bio)was prepared by im-pregnation pyrolysis with corn stover and tributyl phosphate as the raw materials.The structure of P-bio was characterized and analyzed,and the effects of persulfate(PMS)concentration,P-bio dosage,and initial pH on BPA degradation by P-bio activated PMS system were further explored.The results indicated that the surface of P-bio was a sheet-like structure composed of obvious folds,which was porous and loose.The specific surface area of P-bio was 173.985 m2/g,which was 93.4 times higher than that of pure biochar(1.863 m2/g).Under the conditions of BPA concentration of 10 mg/L,P-bio dosage of 2 g/L,pH of 3.21,and PMS dosage of 2 mmol/L,the removal rate of BPA by P-bio activated PMS system was 99.47%after 30 minutes,and the reaction rate constant was 0.164 3 min-1.It was further confirmed by EPR quenching that active radicals SO4·-and·OH were generated in the P-bio activated PMS system,which contributed to the degradation of BPA by 12.07%and 87.93%,respectively.For the reuse of P-bio,BPA removal rate was 74.1%at the 2nd use and 68%at the 3rd use,and BPA removal rate recovered to 80.7%after calcination of P-bio after three consecutive uses,which indicated that the P-bio catalyst had strong reusability and regeneration performance.
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