紫外线照射下砷在钛柱撑蒙脱土上吸附机理的研究

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1、ABSTRACTArsenicisakindofenvironmentalpollu诅ntswithstrongtoxicityand鲫rongcarcinogenicea’cct，belong·timeexposurcdtohi曲arseniccontentin、·theenvironmentwillinducepeople’shealthproblem．Astheworld’saVailablef．reshwaterresourcesislimited，manycountries’problemofexcessiVeleVelsofarsenicindrinkingwaterha

2、sbecomemoreandmoreseriously．Theadsorptionprocess卸dadso币tionmechanismisve叫helpfhltodeVelopakindofe衢cientabso印tionmaterials，卸dit’salsohelpmltooptimizetreatInentconditions．Atpresem，thestudyoftheadsorptionmechanismofarsenateanioninnaturalminerals，sediment锄dsoiladso叩tionbehaviorisahotkindofreseallch

3、．Basedontheadsorbentdevelopedbythepredecessorsofourtc锄，thethesisStudytheadso中tionmechanismofAs(V)andAs(III)adsorbedonTi—MMTundertheUVlight．Andt拶tofindthedi脏rente疏ctofdi舵rentUVi丌adiationconditionsonarsenate锄darseniteadsorptionmechanism．Theresultsshowthat：bothdarkconditions锄dultravioletlightc舳acc

4、eleratethematerialstoremoVearsenicelementswithinashontimee目’ectiVely．Thepseudo-second—orderchemicalreactionmodelprovidedgoodcorrelationofdyn锄icsdataforbotharsenate柚darSenite．1tindicatestheadso印tionprocessmightbechemiso叩tion．TheprocessofArsenateadsorptioncanbemorequicklyreachedequilib订um，卸datthe

5、beginningtherateofarSeniteadsorptionisslow，itmaybecausethereisaprocessofoxidationreactionratecontroIlingStepintheadsorp们onofarSenite．HoweVer，theadso叩tioncapacityofarseniteisbigger．AndthroughthefittingaIldfoundthatUVimdiationdidnot打ivalentarSenic锄dpentavalentarSenicadsorptionimpaCt．Contrastingth

6、eadsorbentofarseniteindi廊rentUVi11radiationconditionsusingIR，XPS，andEPRmethodtoinveStigatethedi疵renceinfinestructureofadso印otion．AnalysisofIRshowmattheadsorptionoccursbotllintheinterlayerandonthesurf-aceofadsorbent，andfo咖As—ObondinsideoftheTi—MMT，indicatingthereisasmaHpartofthearsenicisadsorbed

7、inthefomchemicalbondstothematerial．AnalysisofXPSshows：BothbeforeandbehindtheadsorptionofarSenic，thebindingener?gyofTiisnotchanged，ands0doesitindiH'eI．entUVin．adiationconditions．Itcandeducearsenateandarsenitearenotformthebondwithti