Mechanism analysis of membrane fouling behavior by humic acid using atomic force microscopy:Effect of solution pH and hydrophilicity of PVDF ultrafiltration membrane interface

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• Affiliation of Author(s):化学与化工学院
• Journal:Journal of Membrane Science
• Key Words:中文关键字：原子力显微镜；PVDF膜；腐殖酸；膜-腐殖酸界面作用力；界面自由能，英文关键字：Atomic force microscopy；PVDF membrane；Humic acid；M
• Abstract:The adhesionforcesofmembrane–humic acid(membrane–HA) andHA–HA weremeasuredbyatomic force microscopy(AFM)inconjunctionwithself-mademodified membrane-coatedandHA-coated probes, respectively.Normalized flux declinerateandtheirreversiblefoulingindexoffouling experimentswithHAkeptgoodlinearcorrelationswiththeAFMforcemeasurements.Theextended Derjaguin–Landau–Verwey–Overbeek(XDLVO)theorywasusedtoexplaintheinfluence andregularity of HAsolutionpHandhydrophilicityofpolyvinylidene fluoride (PVDF)ultrafiltration (UF)membrane interface onmembranefoulingbehavior.TheresultsofAFMforcemeasurementsillustratedthatthe adhesion forceinacidicenvironmentwasmuchstrongerthanthatinalkalineorneutralenvironment and theadhesionforceofPVDF/polyvinylalcoholmembrane–HA (PA–HA) wasweakerthanthatofPVDF/ polyvinylpyrrolidonemembrane–HA (PP–HA). XDLVOtheoreticalcalculatedresultsdemonstratedthat the polarcomponentofsurfacetension ðγABÞ of membrane–foulant couldbeeffectivelyincreasedby improvingthehydrophilicityofthePVDFUFmembraneinterfaceandreducingthesolutionacidity, which resultedinthedecreaseofabsolutevaluesofthemembrane–HA interfacialfreeenergyof adhesion ðΔGAD mlf Þ, themitigationofthemembranefoulingrateandtheirreversiblefoulingdegree.The results preliminarilyprovedthatthemeasurementsofmicroscopicinterfacialforceswithmodified AFM colloidal probeshadpotentialapplicationvaluesinUFmembranefoulingbehavior.
• Note:SCI
• Co-author:唐卫婷,黄丹曦,陈赫男
• First Author:张楠[重名-待确认],wangxudong,wanglei,mengxiaorong
• Indexed by:Journal paper
• Volume:卷：
• Issue:期：487
• Page Number:页：180-188
• Translation or Not:no
• Date of Publication:2015-04-01