TiO2悬浮体系光催化降解壬基酚的研究

研究了以悬浮态TiO2为催化剂,在H2O2存在的条件下,壬基酚的光催化降解反应.分别研究了pH值、TiO2和H2O2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pH=5,30 mg/L的H2O2中,初始质量浓度为20 mg/L壬基酚的溶液光照180min后,降解率达54.42%.

Study on photocatalytic degradation of nonylphenol in TiO2 suspension

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%.