摘要
以中压汞灯为模拟阳光光源,研究了环境浓度范围内硝酸根溶液中双酚A(BPA)的光解,探讨了pH值、NO3-浓度、BPA初始浓度等因素对BPA光解速率的影响.结果表明,BPA在纯水体系中直接光解很慢,但在碱性体系和硝酸根溶液中光解迅速,符合一级动力学反应.采用硝基苯作为分子探针鉴定了NO3-光化学生成的羟基稳态浓度为1.27×10-14mol/L,推算BPA与羟基的二级反应速率常数为1.01×1010L/(mol?s).采用GC/MS法鉴定了BPA光解产物,并推测BPA的光解途径主要涉及苯环间的断裂和生成的产物及母体化合物的羟基和硝基衍生化.
The photodegradation of bisphenol A （BPA） in nitrate solutions in the range of environmental concentration was studied using mercury lamp with middle pressure as simulated solar source; and the influence of factors of pH value, nitrate concentration, and initial BPA concentration on the photodegradation rate of BPA was explored. BPA direct photodegradation was very slow in pure aquatic system; but was rapid in alkaline system and nitrate solutions according with first grade dynamic equation. The steady-state concentration of hydroxyl radical produced from NO3- photo chemically was determined to be 1.27×10^-14mol/L adopting nitrobenzene as molecular probe; and the second grade reaction rate coefficient of BPA with hydroxyl radical was estimated to be 1.01×10^10L/（mol·s）. The photodegradation products of BPA were identified adopting GC/MS technique; and the photo degradation way of BPA inference involved mainly the decomposition of benzene ring and its generated product; and derivatigation of hydroxyl and nitro of parent compound.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2005年第4期487-490,共4页
China Environmental Science
基金
国家科技攻关计划重大项目(2003BA808A17)
国家自然科学基金资助项目(20207004)
江苏省自然科学基金资助项目(BK2002413)
关键词
双酚A
硝酸根
光解
活性氧
bisphenol A
nitrate
photodegradation
reactive oxygen
