Mechanisms regarding the enhanced degradation of chlorinated organophosphates by ultrasound-assisted thermally activated persulfates
A heat-coupled ultrasonic activated persulfate(Heat/US/PDS)oxidation degradation technology of tri(2-chloroethyl)phosphate(TCEP)was established in this study.The reaction parameters were optimized by the central combination design method(CCD)of the response surface(RSM).The reaction parameters of TCEP removal in this system were more moderate(ultrasonic power was 402.5W,temperature was 52.6℃,reaction time was 120min),and the degradation rate of TCEP was predicted to reach 95.3%.Both coexisting ions and humic acids inhibited the removal of TCEP,and the degradation rate of TCEP was 76%in the four water bodies.Radical quenching experiments and EPR analysis showed that SO4·-and·OH were the main reactive oxygen species.Five possible degradation intermediates of TCEP were detected.Zebrafish embryo exposure experiment showed that TCEP was safe to react in aqueous solution in this system,and the ecotoxicity of TCEP and its possible products to large fleas,algae and fish was evaluated,and the ecotoxicity of degradation products to aquatic organisms was low.
万方数据
维普
