活化过硫酸盐氧化地下水中苯酚的动力学研究
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2020-03-16 10:03:12
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中国环境科学2015,35(9):2677-2681ChinaEnvironmentalScience活化过硫酸盐氧化地下水中苯酚的动力学研究文0佳露,卢伟,张凤君,苏小四,朱永娟,李仁声,吕聪(1.吉林大学地下水资源与环境教育部重点实验室,吉林长春130021;2.长春市环境监测中心站,吉林长春130021)摘要:以柠檬酸(cA)络合亚铁离子CA—Fe(II)为活化剂,活化过硫酸盐(s2osZ-,ps)产生强氧化剂硫酸根自由基(S04'),进而催化氧化苯酚-从CA/Fe(II)物质的量比、Fe(II)浓度、过硫酸盐(Ps)投加量和苯酚初始浓度4个因素来考察络合亚铁离子活化过硫酸盐氧化去除苯酚的动力学.结果表明,随着PS投加量的增加,苯酚的去除率随之提高;但随着苯酚初始浓度的增加,去除率逐渐降~;CA/Fe(II)物质的量比为1/5时,能够保持水溶液中足量的亚铁离子,有利于苯酚的氧化去除;当PS/CA/Fe(II)/苯酚物质的量比为100/10/50/1时,苯酚的去除率最高,反应15min后去除率达到98%,此时,苯酚的氧化反应速率也达到最高值O.430min1.活化过硫酸盐氧化去除苯酚的过程基本符合准一级动力学,在CA/Fe(II)/苯酚物质的量比为10150/1条件下,苯酚氧化反应速率与过硫酸盐投加量呈线性正相关=0.953).关键词:硫酸根自由基;络合亚铁离子活化:苯酚;地下水:反应速率中图分类号:X523文献标识码:A文章编号:1000—6923(2015)09—2677—05Kineticsstudyofactivatedpersulfateoxidationofphenolingroundwater.LIUJia-lu,LUWei,ZHANGFeng-jun,SUXiao.si,ZHUYong-juan,LIRen—sheng2,LOCong(1.KeyLaboratoryofGroundwaterResourcesandEnvironment,MinistryofEducation,JilinUniversity,Changchun130021,China;2.ChangchunEnvironmentalMonitoringCentralStation,JilinUniversity,Changchun130021,China).ChinaEnvironmentalScience,2015,35(9):2677~2681Abstract:Thephenoloxidationbysulfatefreeradical(804‘)formedintheactivationofpersulfatebycitricacidchelatedferrousion(CA-Fe(II))wasinvestigatedinthisstudy.Theinfluenceofdiferentfactors,suchasCA/Fe(II)molarratio,Fe(II)concentration,initial$208molaramountandphenolconcen~ationonthekineticsofphenoloxidationbychelatedFe(II)activatedpersulfateWasdescribedindetail.ResultsindicatedthattheremovaleficiencyofphenolWassignificantlyincreasedwithincreasingpersulfatedosage,butdecreasedwithincreasinginitialphenolconcentration.ACA/Fe(II)molarratioof1/5contributedtophenolremovalonmaintainingsuficientquantitiesofavailableFe(II)insolution.Thehighestphenolremoval(98%)callbeobtainedwithina15minwiththePS/CA/Fe(II)/phenolmolarratioof100/10/50/1andthehighestoxidationrate(0.430min)wasgained.Thephenoloxidationbychelatedferrousionactivatedpersulfatefollowedthepseudo-first·orderkineticsreaction.WiththeCA/Fe(II)/FIhenolmolarratioof10/50/1,thephenoloxidationrateconstantexhibitedalin
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