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时间:2020-03-25
《微波-CTMAB膨润土吸附除磷的动力学和热力学研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第39卷第1期非金属矿V_01.39No.12016年1月Non.MetallicMinesJanuary,2016微波.CTMAB膨润土吸附除磷的动力学和热力学研究宋珍霞郑伏安徐建平蔡昌凤(安徽工程大学生物与化学工程学院,安徽芜湖241000)摘要通过静态实验,考察了在不同反应时间和温度条件下,原膨润土(OB)、CTMAB改性膨润土(CTMABB)以及微波一CTMAB协同改性膨润土(MCTMABB)对PO43。吸附效果的影响;对3种材料除磷的吸附动力学、吸附速率控制步骤以及吸附热力学模型进行了拟合并计算出相应参数。结果表明,吸附反
2、应15min(25℃),OB、CTMABB及MCTMABB对PO4的吸附基本达到平衡,其吸附容量分别达到2.27、3.50和4.88meCg。伪二级动力学方程可以很好地描述3种材料对PO4的吸附(R>0.99);Elovich方程中的值大小表现为:aoB3、B膨N-k-;P04;吸附动力学;速率控制步骤;吸附热力学中图分类号:X703;TD985文献标识码:A文章编号:1000-8098(2016)01-0027-04StudyonKineticsandThermodynamicsofPhosphorusAdsorptionontoCTMABModifiedBentoniteEnhancedbyMicorwaveSongZhenxia’ZhengFuanXuJianpingCaiChangfeng(ColegeofBiologicalandChemicalEngineering,Anh4、uiPolytechnicUniversity,Wuhu,Anhui241000)AbsrtactTheadsorptioneffectofphosphatefromaqueoussolutionsontooriginalbentonite(OB),CTMABbentonites(CTMABB)andmicrowave—CTMABbentonites(MCTMABB)underdiferentreactiontimeandtemperaturewasstudiedinabatchreactor.Thekineticsdynamics5、,ratecontrollingstepaswellasthethermodynamicsofphosphateadsorptionfromaqueoussolutionsontotheabove3kindsofadsorptionmaterialswasinvestigated.Theresultsshowedthattheadsorptionequilibriumofthe3kindsofmaterialswasbasicallyreachedwithin15minat25℃.andthephosphateadsorptionc6、apacityofOB,CTMABBandMCTMABBwere2.27,3.50and4.88mg/g,respectively.ThephosphorusadsorptiononOB,CTMABBandMCTMABBwasfoundtofollowpseudosecond—orderkineticmodelwell(>O.99).ThevalueofElovichequationwas:nOB7、bentonitecouldbeenchancedorderlybyCTMABmodificationandthesynergisticmodificationefectofmicrowaveandCTMAB.Theadsorptionreactionof3kindsofmaterialswascontrolledbyliquidfilmdifusionandintra—particaldiffusion.Andalsoitwasaprocesswhichwasspontaneousandexothermic,therefore,r8、aisingtemperaturewasunbeneficialtotheadsorptionreaction.Keywordsmicrowave—CTMABbentonites;PO4;adsorptionkinetics;rate
3、B膨N-k-;P04;吸附动力学;速率控制步骤;吸附热力学中图分类号:X703;TD985文献标识码:A文章编号:1000-8098(2016)01-0027-04StudyonKineticsandThermodynamicsofPhosphorusAdsorptionontoCTMABModifiedBentoniteEnhancedbyMicorwaveSongZhenxia’ZhengFuanXuJianpingCaiChangfeng(ColegeofBiologicalandChemicalEngineering,Anh
4、uiPolytechnicUniversity,Wuhu,Anhui241000)AbsrtactTheadsorptioneffectofphosphatefromaqueoussolutionsontooriginalbentonite(OB),CTMABbentonites(CTMABB)andmicrowave—CTMABbentonites(MCTMABB)underdiferentreactiontimeandtemperaturewasstudiedinabatchreactor.Thekineticsdynamics
5、,ratecontrollingstepaswellasthethermodynamicsofphosphateadsorptionfromaqueoussolutionsontotheabove3kindsofadsorptionmaterialswasinvestigated.Theresultsshowedthattheadsorptionequilibriumofthe3kindsofmaterialswasbasicallyreachedwithin15minat25℃.andthephosphateadsorptionc
6、apacityofOB,CTMABBandMCTMABBwere2.27,3.50and4.88mg/g,respectively.ThephosphorusadsorptiononOB,CTMABBandMCTMABBwasfoundtofollowpseudosecond—orderkineticmodelwell(>O.99).ThevalueofElovichequationwas:nOB7、bentonitecouldbeenchancedorderlybyCTMABmodificationandthesynergisticmodificationefectofmicrowaveandCTMAB.Theadsorptionreactionof3kindsofmaterialswascontrolledbyliquidfilmdifusionandintra—particaldiffusion.Andalsoitwasaprocesswhichwasspontaneousandexothermic,therefore,r8、aisingtemperaturewasunbeneficialtotheadsorptionreaction.Keywordsmicrowave—CTMABbentonites;PO4;adsorptionkinetics;rate
7、bentonitecouldbeenchancedorderlybyCTMABmodificationandthesynergisticmodificationefectofmicrowaveandCTMAB.Theadsorptionreactionof3kindsofmaterialswascontrolledbyliquidfilmdifusionandintra—particaldiffusion.Andalsoitwasaprocesswhichwasspontaneousandexothermic,therefore,r
8、aisingtemperaturewasunbeneficialtotheadsorptionreaction.Keywordsmicrowave—CTMABbentonites;PO4;adsorptionkinetics;rate
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