Abstract:Ultrasound and chloramine combined process was employed in this paper to remove triclosan (TCS) in aqueous solution. The effects of several factors such as ultrasonic power, chloramine dosage, TCS initial concentration, pH and radical scavenger on TCS degradation were studied. Furthermore, the degradation products were identified and the degradation mechanism of TCS by combined process was discussed. The results indicated that the combination of ultrasound and chloramine can remove TCS effectively and possess significant synergetic effect on the degradation. The degradation rate of TCS could reach 90.8% within 120min under the conditions of ultrasonic power 600W, TCS initial concentration of 200μg/L, and chloramine dosage of 5mg/L. TCS degradation efficiency decreased with the raise of initial concentration of TCS, and tended to increase firstly and then decrease with the increase of chloramine concentration. Alkaline environment was conducive to the TCS removal, and the degration efficiency of TCS could reach 100% when pH value was 10.7. The presence of free radical scavenger TBA had an inhibitory effect on TCS degradation. The identification and recognition of degradation products by GC/MS indicated 2,4-dichlorophenol (2,4-DCP) was the main degradation products of TCS during the combined process.
李青松, 周生辉, 李国新, 陈国元, 马晓雁, 高乃云. 超声波与氯胺联用工艺去除水中三氯生的研究[J]. 中国环境科学, 2015, 35(9): 2670-2676.
LI Qing-Song, ZHOU Sheng-Hui, LI Guo-Xin, CHEN Guo-Yuan, MA Xiao-Yan, GAO Nai-Yun. Degradation of triclosan in aqueous solution by using ultrasound combined with chloramine. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(9): 2670-2676.