均相Fenton氧化降解对木素模型物对羟基苯丙酸去除效果的研究

Study on Oxidative Degradation of p-Hydroxyphenyl Propionic Acid as Model Compound of Lignin in Homogeneous Fenton Processes

以木素类模型物对羟基苯丙酸(HL)为研究对象,研究了均相Fenton试剂对HL的降解,探讨了体系pH值、H2O2用量、Fe2+用量、HL溶液初始质量浓度、反应时间、紫外光照射等因素对HL降解的影响。结果表明,在室温条件下,当体系原始pH值4.0时,加入2倍理论用量的H2O2,Fe2+与H2O2摩尔比为1∶100,反应60 min后,初始质量浓度为60 mg/L的HL溶液,其去除率可达79.2%;体系在紫外光照射下可形成协同效应,降解速度显著加快,同样条件下反应20 min,溶液中HL和TOC去除率分别可达到98.3%和79.6%。

This paper took p-hydroxyphenyl propionic acid （HL） as the model compound of lignin to investigate the degradation of HL by homogeneous Fenton reagent. It was showed that the factors of pH value, dosages of H2O2 and Fe^2＋ , initial concentration of HL, reaction time and UV irradiation etc had obvious influence on degradation of HL. The experimental results demonstrated that at original pH = 4.0 and room temperature, 79.2% of HL was degradation during 60 minutes period when the dosage of H2 02 was two times of the theoretical quantity and Fe^2＋/H2O2 molar ratio = 1： 100. By using the UV irradiation in Fenton process, the synergistic effect could be obtained and the degradation rate increased obviously. The removal rate of HL and TOC reached 98.3% , 79.6% respectively during 20 minutes at the same conditions.