超声联合过硫酸钠去除水中三氯生

采用超声（US）联合过硫酸钠（SPS）对水中三氯生（TCS）的去除进行了研究，GC/MS鉴定识别了联用工艺降解产物，考察了US功率、SPS的投加量、pH值、碳酸盐和溴离子等对TCS去除的影响。结果表明2，4-二氯苯酚（2，4-DCP）为其主要降解产物，US/SPS工艺强化了单独US去除效果，SPS浓度为4 mmol·L-1，US功率为600 W时，初始浓度为 410 μg·L-1的TCS 120 min后去除率可达100%。TCS的降解符合拟一级反应动力学方程，其动力学常数K=0.028 min-1。TCS的去除率随SPS浓度的增加先增大后减小，实验范围内（0~600 W）TCS去除率随US功率增加而增大，强酸强碱环境不利于TCS的去除，TCS去除率随碳酸氢钠浓度的增加先减小后增大，碳酸钠的加入对TCS去除影响不大，溴离子对TCS的去除具有抑制作用。

Degradation of triclosan in aqueous solution by ultrasound combined with sodium persulfate

Ultrasound combined with sodium persulfate was employed to remove triclosan (TCS) in an aqueous solution.The degradation product was identified by GC/MS and the effects of several factors, such as ultrasonic power, sodium persulfate dosages, initial pH, carbonates, and Br- concentrations on TCS degradation were studied.The results indicated that 2,4-dichlorophenol (2,4-DCP) is the main degradation product of TCS during the process and that ultrasound combined with a sodium persulfate process can enhance the TCS removal efficiency compared to the ultrasound system alone.The removal rate of an initial TCS concentration of 410 μg·L-1 reached 100% within 120 min with 4 mmol·L-1 sodium persulfate dosage and 600 W of ultrasonic (US) power.TCS degradation was well-fitted to the pseudo-first-order kinetic model with an apparent pseudo-first-order rate constant of 0.028 min-1.The TCS degradation efficiency increased first and then decreased with an increase in sodium persulfate dosages.The TCS removal rate increased with an increase in US power, within the experimental range of 0 to 600 W.Strong acidity and alkali conditions are both detrimental to TCS removal.The TCS removal rate first decreased and then increased with an increase in sodium bicarbonate concentration;however, the effect of sodium carbonate in the process on the removal rate was not significant.The removal of TCS inhibited in the presence of Br-.