TiO2/H2O2/超声波协同降解壬基酚聚氧乙烯醚溶液

采用经过处理的锐钛矿型TiO2作为催化剂,在H2O2存在下,以TiO2/H2O2/超声波协同降解壬基酚聚氧乙烯醚反应为模型,探讨了TiO2催化剂用量、H2O2用量、超声波功率、壬基酚聚氧乙烯醚溶液初始浓度、初始pH值对壬基酚聚氧乙烯醚降解率的影响。结果表明,在一定的超声波功率和一定的TiO2用量范围内,壬基酚聚氧乙烯醚降解率随超声波功率和TiO2用量的增大而增大,达到一定值后保持平稳;当H2O2浓度介于一定范围内,增大H2O2用量可提高壬基酚聚氧乙烯醚的降解率,但H2O2用量过多时,反而会使壬基酚聚氧乙烯醚的降解率下降;pH<5时,壬基酚聚氧乙烯醚降解效果较好,且pH值越小,降解率越高;pH>5时,降解率越来越低。TiO2/H2O2/超声波体系降解壬基酚聚氧乙烯醚产生了较强烈的协同效应,在同一时刻三者协同体系的降解率比其3种单独体系的降解率之和高出约60%;在TiO2催化剂用量0.4g/L、H2O2用量0.2g/L、超声波功率600W、降解时间120min的条件下,对初始质量浓度为80mg/L,pH=1的壬基酚聚氧乙烯醚溶液进行降解,其降解率达98%以上。

Synergistic Degradation of Nonylphenol Ethoxylate with TiO2/H2O2/Ultrasound

Ultasound(US) was used to degrade nonylphenol ethoxylate(NP10EO) in water in the presence of TiO2 catalyst and H2O2. The effect of TiO2 concentration, H2O2 concentration, ultrasound power, initial concentration and pH of NP10EO on the degradation efficiency of NP10EO were investigated, and the synergistic efficiency among TiO2 , H2O2 and US was discussed. The results show that the degradation efficieney of NP10EO increases with increasing ultrasound power and TiO2 concentration whithin certain ranges, and then becomes stable. The degradation efficiency of NP10EO first increases with the H2O2 concentration to reach a maximum and then decreases. When pH is less than 5, the degradation effciency is high, and the degradation effciency decreases with increasing pH. When pH is greater than 5, the degradation efficiency is low. The synergistic effect on degradating NP10EO in water by TiO2/H2O2/US was evident, and more than 98% NP10EO can be degraded in the presence of catalyst TiO2 at a concentration of 0.4 g/L, an H2O2 concentration of 0.2 g/L, an ultrasound power of 600 W, an initial concentration 80 mg/L and pH=1 of NP10EO within 120 min.