摘要
研究了以悬浮态Ti O2 为催化剂,在H2 O2 存在的条件下,壬基酚的光催化降解反应。分别研究了p H值、Ti O2 和H2 O2 的加入量、壬基酚的初始质量浓度以及光照时间对降解反应的影响。结果表明:在p H=5 ,3 0 mg/ L的H2 O2 中,初始质量浓度为2 0 mg/ L壬基酚的溶液光照180 min后,降解率达5 4.42 %。
The present paper is intended to introduce the authors' study of photodegradation of nonylphenol (NP) in water. As we know, nonylphenol (NP) is widely used in industrial and everyday applications. It is also one of the main degradation products of nonylphenol ethoxylates (NPE), which constitute the main part of the production of 4-alkylphenol ethoxylates (APE). Once used, NPE are discharged into municipal and industrial waste waters, in turn draining into the sewage processing plants. In step-by-step processing, complex biodegradation occurs as a result, forming a few kinds of biorefractory metabolites. NP produced in this case is particularly persistent and toxicant. From the point of view of the environmental toxicological research, NP has been recognized as one of endocrine disrupting chemicals (EDCs). So far there have been lots of studies concerning the biodegradation research of NP. In the experiment, the photocatalyst was TiO_2 suspension. The reaction proceeded using a 125 W mercury lamp as ultraviolet light source. We have also studied the influences of various parameters such as irradiation time, the amount of TiO_2, pH, the concentration of H_2O_2and the initial concentration of NP. The results show that the best condition for photodegradation of NP is pH=5, 30 mg/L H_2O_2and 180 min irradiation and the degradation rate of NP reaches 54.42%.
出处
《安全与环境学报》
CAS
CSCD
2005年第2期57-59,共3页
Journal of Safety and Environment
基金
湖北省教育厅 2 0 0 4重点科研项目 (2 0 0 4X12 1)
湖北省建设厅 2 0 0 3年科技攻关项目 (k2 0 0 3 0 8)
关键词
环境工程
壬基酚
降解
光催化
氧化钛
environmental engineering
nonylphenol
photocatalytic degradation
titanium dioxide
