低浓度环糊精强化Fenton试剂降解液相中茚并（1,2,3-cd）芘的试验研究

为了研究Fenton试剂对液相中茚并（1,2,3-cd）芘的降解效果,采用实验室内试验方法,考察并确定了H2O2浓度、FeSO4浓度、反应时间、pH值以及低浓度环糊精等因素对降解的影响。结果表明,使用Fenton试剂可以有效降解液相中的茚并（1,2,3-cd）芘。在降解过程中,对初始浓度为2.5mg·L-1的茚并（1,2,3-cd）芘,当H2O2浓度为20.0mmol·L-1,FeSO4浓度为3.0mmol·L-1时降解较为有效,去除率可达到62.88%,浓度过高或者过低都不利于反应的发生。Fenton氧化降解茚并（1,2,3-cd）芘的反应在60min内可以完成,并且pH值控制在3时更加有利于降解。反应体系中加入低浓度环糊精可以增加茚并（1,2,3-cd）芘在水相中的溶解度,当加入HPCD的浓度为3mg·L-1时,Fenton试剂对茚并（1,2,3-cd）芘的氧化去除率可由62.88%提高至71.24%。

The Enhancement of Indeno（1,2,3-cd）Pyrene Oxidation by Low Concentration of Cyclodextrin with Fenton Reagent in Aqueous Phase

Fenton reagent,composed of H2O2 and FeSO4,was a vital and efficient oxidant to degrade polycyclic aromatic hydrocarbons（PAHs）,especially for the PAHs unavailable to microorganisms,such as indeno（1,2,3-cd）pyrene.The degradation efficiency of indeno（1,2,3-cd）pyrene with Fenton reagent in aquatic phase was studied under different pH,reaction time,H2O2,FeSO4 and low concentrations of cyclodextrin conditions.The results indicated that with the initial indeno（1,2,3-cd）pyrene concentration of 2.5 mg·L-1,the removal efficiency was 62.88% under the condition of 20.0 mmol·L-1 H2O2 and 3.0 mmol·L-1 FeSO4.For efficient degradation of indeno（1,2,3-cd） pyrene,pH should be maintained as 3.With the amendment of cyclodextrin,the solubility of indeno（1,2,3-cd）pyrene could be improved in aqueous phase.Among the four types of cyclodextrins,mainly including hydroxypropyl-β-cyclodextrin（HPCD）,β-cyclodextrin（β-CD）,methyl-β-cyclodextrin（MCD）and acetyl-β-cyclodextrin（ACD）,HPCD was proved to be the best one to increase the solubility of indeno（1,2,3-cd）pyrene at the concentration of 3.0 mg·L-1.With the amendment of HPCD at the concentration of 3 mg·L-1,the removal efficiency of indeno（1,2,3-cd）pyrene was 71.24%,compared to 62.88% without cyclodextrin.Cyclodextrin with a low concentration would be more valuable in practical engineering program,given its high price and inaccessibleness,compared to the high concentration of cyclodextrin.