摘要
以室内实验方法,在25℃室温下,以二氧化锰为氧化剂,研究了pH4.12的水溶液中双酚A降解的反应动力学,并讨论了反应溶液的pH对反应动力学的影响。动力学研究采用了批处理实验方法和螺旋盖反应瓶-振荡器反应体系。结果表明,在无二氧化锰的条件下,双酚A的浓度在1周内检测没有明显的变化。在二氧化锰存在的条件下,双酚A对二氧化锰的氧化作用具有较强的反应感受性。pH一定的条件下,当二氧化锰相对过量时,在1小时之内,反应遵循准一级反应动力学,双酚A降解速率随其自身及二氧化锰浓度的增大而增大。随着反应的进行,双酚A的降解速率变慢,反应遵循的不是简单的准一级反应动力学而是复合的反应动力学。此外,随着溶液pH值由3.5升高至6.6,双酚A的降解速率显著下降。
In this study, oxidative transformation of bisphenol A （BPA） facilitated by manganese oxide （MnO2） was examined in the controlled temperature （25℃） and batch experiment using screw-cap glass bottle coupled to completely mixed shaker system. The reaction kinetics and the effect of pH on initial reaction rate were discussed in this paper. The control experiment indicated that no any degradation of BPA was found when MnO2 did not occurred in the reaction system. The result of kinetics showed that BPA was highly susceptible to oxidation by MnO2. With an excess of MnO2 and at a constant pH, the transformation rate of BPA follows the simple pseudo-first-order kinetics and increase with the concentration of BPA and MnO2 within one hour, then the loss of BPA slows as the reaction proceeding and deviates from the simple pseudo-first-order kinetics. Furthermore, the transformation rate decreases significantly as the pH of the reaction mixture increases from 3.5 to 6.6.
出处
《生态环境学报》
CSCD
北大核心
2009年第2期431-434,共4页
Ecology and Environmental Sciences
基金
国家自然科学基金项目(40573060)
关键词
氧化降解
双酚A
二氧化锰
反应动力学
oxidative transformation
bisphenol A
manganese oxide
reaction kinetic
