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1、GAC对水中内分泌干扰物双酚A的吸附特性及动力学研究111112李若愚高乃云徐斌曹俊赵建夫乐林生(1同济大学污染控制与资源化研究国家重点实验室,上海200092;2上海市自来水市北有限公司,上海200086)摘要研究了颗粒活性炭(GAC)对水中内分泌干扰物双酚A(BPA)的吸附容量、吸附动力学及其影响因素。结果表明,GAC吸附容量大,吸附等温线符合Langmuir和Freundlich模型;吸附容量受GAC粒径的变化影响较大。Langmuir模型的最大吸附容量qm与粒径dp关系为:ln(qm)=-0.5075@ln(dp)+14.07;Freundlich模型kf与dp关系为:
2、ln(kf)=-1.078ln(dp)+18.307。GAC对BPA为单分子层吸附,400min基本可达到平衡,且吸附速率变化符合拟二级动力学模型,dp与速率常数k2之间符合ln(k2)=-1.039ln(dp)-9.014;BPA初始浓度C0与k2关系式为1/k2=529.7C0-35979。关键词双酚A颗粒活性炭吸附等温线吸附动力学内分泌干扰物OnGACadsorptioncharacteristicsandkineticsofEDCsObisphenolAinwater111112LiRuoyu,GaoNaiyun,XuBin,CaoJun,ZhaoJianfu,LeLi
3、nsheng(1.StateKeyLaboratoryofPollutionControlandResourceReuse,TongjiUniversity,Shanghai200092,China;2.ShanghaiWaterworksShibeiCo.,Ltd.,Shanghai200086,China)Abstract:Theadsorptioncapacity,adsorptionkineticsandimpactfactorsofendocrinedisrup2tingchemicals(EDCs)ObisphenolA(BPA)inwaterongranulara
4、ctivatedcarbon(GAC)werein2vestigatedinthisstudy.TheresultsshowedthathighBPAadsorptioncapacitycouldbeachievedbyGAC.Moreover,theexperimentresultsofadsorptionisothermfittedLangmuirandFreundlichmodel.ThevariationofadsorptioncapacitywasinfluencedbyparticlediameterofGAC.Therela2tionbetweenthebigge
5、stcapacityqmofLangmuirmodelandparticlediametercouldbeexpressedas:ln(qm)=-0.5075ln(dp)+14.07,andtherelationbetweenthekfvalueofFreundlichmodelandparticlediametercouldbeexpressedas:ln(kf)=-1.078ln(dp)+18.307.Fromtheadsorp2tionkineticsexperiment,theadsorptionequilibriumcouldbeachievedin400minute
6、sforGAC.Bythecomparisonbetweendifferentadsorptionkinetics,itcouldbedrawnthatpseudosecondordermodelcouldbeusedtosimulatetheadsorptionprocesseffectively.Therelationbetweenthek2val2ueofthepseudosecondorderandparticlediametercouldbeexpressedas:ln(k2)=-1.039ln(dp)-9.014;whiletheinitialconcentrati
7、onofBPA(C0)was1/k2=529.7C0-35979.Keywords:BisphenolA;Granularactivatedcarbon;Adsorptionisotherm;AdsorptionkineOtics;Endocrinedisruptingchemicals双酚A(BisphenolA,BPA)作为合成树脂的组用,一旦进入人体内,可引起精子量减少等生殖功成物质原材料是重要的化工原料,它具有雌激素作能异常。美国国家环保局(USEPA)、日本、世界野生动物基金组织等
