第一作者:伍林,男,1999年生,硕士研究生,主要从事多环芳烃污染土壤修复研究。#通讯作者。*国家自然科学基金资助项目(No.51974314)。Fe2+-热活化过硫酸钠氧化降解菲及其对土壤的影响*伍林刘燕泽华王丽萍#(中国矿业大学环境与测绘学院,江苏徐州221116)摘要在模拟菲污染土壤中用β-环糊精(β-CD)作为Fe2+螯合剂,考察了Fe2+-热(45℃)活化过硫酸钠(Na2S2O8)氧化降解菲的效果及其对土壤的影响。结果表明,Na2S2O8∶菲=80、Fe2+∶Na2S2O8=1/3、β-CD∶Fe2+=1/10(均为摩尔比)时,菲的降解率最高,达85.1%。Fe2+活化时主要自由基为SO-4·和·OH,而热活化时主要为·OH。根据中间产物推测菲的两条降解途径为:自由基攻击菲的9、10位点生成(1,1’-联苯)-2,2’-二甲醛或攻击2、3位点氧化开环生成2-乙基-6-甲氧基萘,再形成邻苯二甲酸二丁酯,最终矿化为CO2和H2O。土壤氧化修复后,pH降低,氧化还原电位升高,细菌菌落丰富度和均匀度下降,但菌群的抗逆性增强。关键词过硫酸盐Fe2+-热活化菲土壤修复β-环糊精DOI:10.15985/j.cnki.1001-3865.2023.08.007OxidativedegradationofphenanthrenebyFe2+-heatactivatedNa2S2O8andtheeffectonsoilWULin,LIUYanzehua,WANGLiping.(SchoolofEnvironmentandSpatialInformatics,ChinaUniversityofMiningandTechnology,XuzhouJiangsu221116)Abstract:Theoxidativedegradationofphenanthrene(PHE)byFe2+-heat(45℃)activatedNa2S2O8anditseffectonsoilwereinvestigatedwithβ-cyclodextrin(β-CD)asFe2+chelantinsimulatedsoilcontaminatedwithPHE.ResultsshowedthatwhenNa2S2O8∶PHE=80,Fe2+∶Na2S2O8=1/3andβ-CD∶Fe2+=1/10(allweremolarratios),thedegradationrateofPHEreachedthemaximumof85.1%.MainfreeradicalsproducedintheFe2+activatedsystemwereSO-4·and·OH,whilethatintheheatactivatedsystemwas·OH.Accordingtotheintermediates,2degradationpathwaysofPHEwereproposed:freeradicalsattackedtheSites9and10ofPHEtoform(1,1’-biphenyl)-2,2’-dialdehydeorattackedtheSites2and3togenerate2-ethyl-6-methoxynaphthalene,furtheroxidationtophthalicacidandfinallymineralizationtoCO2andH2O.Afteroxidationremediation,thesoilpHdecreased,theredoxpotentialincreased,andabundanceanduniformityofbacteriacommunitydecreased,too.However,thebacteriaexhibitedaremarkabletolerance.Keywords:persulfate;Fe2+-heatactivatio...
