【摘要】 采用高效液相色谱法研究ClO2对模拟水体中多环芳烃污染物蒽、荧蒽及芘的去除效果,考察反应时间、ClO2投量及pH等因素对多环芳烃去除率的影响,结果表明反应时间和ClO2投量对去除率的影响要高于pH,且当反应时间为30 min,90 min,60 min,ClO2投量分别为0.2 mmol/L,0.5 mmol/L,0.4 mmol/L,pH为7.2时,蒽、荧蒽及芘的去除率可达最大值,分别为99.60%,24.55%和60.35%.以蒽为代表研究多环芳烃与ClO2的反应动力学,结果表明该反应对蒽和ClO2均为假一级反应,总反应级数为二级.在pH为6.8,反应温度为25℃的条件下,反应速率常数(k)为0.03 L/(mmol.min).对ClO2与蒽的反应产物进行了鉴定,结果表明其主要为生物降解性较强的醌类化合物.更多还原

【Abstract】 The effects of chlorine dioxide(ClO2) on the removal of three PAHs,anthracene,fluoranthene and pyrene in simulant solution were studied by High Performance Liquid Chromatography(HPLC).Influence of three factors including reaction time,the dosage of ClO2 and pH on the removal efficiency were investigated by batch experiment.The results showed that ClO2 could remove these PAHs effectively and when time was 30,90,60 min,the dosage of ClO2 were 0.2,0.5 and 0.4 mmol/L and pH was about 7.2,the maximum of their removal ratio could be obtained as 99.60%,24.55% and 60.35%.Besides,Anthracene was selected as the representative to study the kinetics of PAHs with ClO2.The results showed that it was pseudo-first order for both anthracene and ClO2,and the general reaction could be described as second order reaction.The rate constants(k) were 0.03 L/(mmol·min) under the condition with pH and temperature of solution was 6.8 and 25 ℃ respectively.The products of ClO2-ANTH reaction were identified as quinonoid compounds,which could be biodegraded more easily and quickly than ANTH.更多还原