摘要
多溴联苯作为溴代阻燃剂被广泛应用,从而广泛存在于环境。但少有对于多氯联苯环境行为的研究。文章以4,4’-二溴联苯为研究对象,模拟自然环境,探讨了光源强度、初始浓度、pH值和溶解氧等因素对4,4’-二溴联苯降解的影响,以及在模拟太阳光的照射下,研究了Fe3+和腐殖酸对4,4’-二溴联苯在水溶液中光降解速率的影响。结果表明,在高压汞灯照射下,4,4’-二溴联苯的光降解过程符合准一级动力学规律。提高光源强度可加速4,4’-二溴联苯的降解;初始浓度的增加使4,4’-二溴联苯降解速率减慢;反应液在高pH值和低pH值时,均促进4,4’-二溴联苯的光降解进程;体系中溶解氧增多也同样促进4,4’-二溴联苯的降解;小剂量的添加腐殖酸和Fe3+可以促进4,4’-二溴联苯的降解,但超过一定浓度则抑制其光降解。
4,4＇-dibromobiphenyl as a flame retardant was studied with respect of its environmental behavior. Effects of the factors such as those under natural condition, e.g, light intensity, dissolved oxygen and pH, on degradation of 4,4＇- dibromobiphenyl in aqueous solution was investigated in the laboratory, which indicated that the photo-degradation of 4,4＇- dibromobiphenyl under the illumination of high-pressure Hg lamp followed pseudo first-order kinetics. It was also found that addition of certain amounts of humic acid and Fe~ could boost the photo-degradation.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2012年第12期92-95,149,共5页
Environmental Science & Technology
基金
国家水体污染控制与治理科技重大专项(2009ZX07211-005-03)
广东省-教育部省部产学研项目(2009B090300342)
