摘要
研究了有机溶剂中4,4′-二溴联苯(4,4-′DBB)的超声降解.考察了初始质量浓度、处理时间及添加氧化剂(H2O2)和盐(NaC l)后的联合作用对降解率的影响.采用超声频率20 kHz、固定声强0.16W/cm2的超声波作用一段时间,结果表明:初始质量浓度越大,降解率越低;超声时间越长,降解率越高.单独超声降解8 mg/L 4,4-′DBB溶液600 m in,降解率可达16.0%.而加盐超声240 m in,10 mg/L 4,4-′DBB溶液的降解率可提高到12.1%,符合一级反应规律,一级反应常数为-5.231 18×10-4m in-1.超声与过氧化氢(US/H2O2)联合作用180 m in,2 mg/L 4,4-′DBB溶液的最终降解率可达到43.1%.
Ultrasonic technology was used to degrade 4,4＇-DBB （4,4＇-Dibromobiphenyl） in the organic solvent. The initial concentration of 4,4＇-DBB, time of degradation and combinations of ultrasound with other treatment methods such as hydrogen peroxide and salt were studied as the influence factors to the decomposition extent. It was shown that under 20 kHz ultrasound and with its intensity at 0. 16 W/cm^2, the higher the initial concentration was, the smaller the decomposition extent was, and the longer the time was, the bigger the decomposition ratio was. With ultrasonic irradiation for 600 min, the decomposition efficiency of 16. 0% for 8 mg/L 4,4＇-DBB in methanol could be reached. The decomposition extent of 12. 1% for 10 mg/L 4,4＇-DBB could be reached with an added salt as an inducement for 240 min. That behaviour followed the first order reaction and its constant was -5.231 18 ×10^-4min^-1. As the combination method （US/H2O2） was used, the decomposition extent of 43.1% for 2 mg/L 4,4＇-DBB was reached within 180 min.
出处
《南京工业大学学报（自然科学版）》
CAS
2007年第2期102-105,共4页
Journal of Nanjing Tech University(Natural Science Edition)
关键词
4
4'-二溴联苯
超声
降解
过氧化氢
盐
4,4＇-dibromobiphenyl
ultrasound
degradation
hydrogen peroxide
salt
