氧化石墨烯-天然高分子復(fù)合水凝膠的制備及對(duì)陽(yáng)離子染料吸附性能氧化石墨烯/天然高分子復(fù)合水凝膠的制備及對(duì)陽(yáng)離子染料吸附性能

摘要：本研究采用單一淀粉鹽及其化學(xué)結(jié)構(gòu)帶有陽(yáng)離子官能團(tuán)的衍生物作為天然高分子支撐，添加氧化石墨烯，成功制備了一種新型氧化石墨烯/天然高分子復(fù)合水凝膠材料。通過(guò)掃描電子顯微鏡、透射電子顯微鏡、拉曼光譜、X射線粉末衍射等表征技術(shù)，研究了不同制備條件對(duì)氧化石墨烯/天然高分子復(fù)合水凝膠微觀結(jié)構(gòu)的影響?？疾炝瞬煌琾H值、溫度、離子強(qiáng)度以及初始染料濃度等因素對(duì)氧化石墨烯/天然高分子復(fù)合水凝膠材料對(duì)甲基橙的吸附性能。結(jié)果表明，氧化石墨烯/天然高分子復(fù)合水凝膠材料對(duì)甲基橙的吸附性能優(yōu)于單一天然高分子材料，在pH值為8、溫度為35℃、離子強(qiáng)度為0.01mol/L、初始染料濃度為100mg/L的條件下，氧化石墨烯/天然高分子復(fù)合水凝膠材料的最大吸附量為46.72mg/g。

關(guān)鍵詞：氧化石墨烯，天然高分子，復(fù)合水凝膠，陽(yáng)離子染料，吸附性能

Abstract:Inthisstudy,anewtypeofgrapheneoxide/naturalpolymercompositehydrogelmaterialwassuccessfullypreparedbyusingasinglestarchsaltanditschemicalstructure-derivedcationicderivativeasanaturalpolymersupportandaddinggrapheneoxide.Theinfluenceofdifferentpreparationconditionsonthemicrostructureofgrapheneoxide/naturalpolymercompositehydrogelwasstudiedbyscanningelectronmicroscopy,transmissionelectronmicroscopy,Ramanspectra,andX-raypowderdiffraction.Theadsorptionperformanceofgrapheneoxide/naturalpolymercompositehydrogelmaterialonmethylorangewasinvestigatedunderdifferentpHvalues,temperatures,ionstrengths,andinitialdyeconcentrations.Theresultsshowthattheadsorptionperformanceofgrapheneoxide/naturalpolymercompositehydrogelmaterialonmethylorangeisbetterthanthatofsinglenaturalpolymermaterial.UndertheconditionsofpH8,temperature35℃,ionstrength0.01mol/L,andinitialdyeconcentration100mg/L,themaximumadsorptioncapacityofgrapheneoxide/naturalpolymercompositehydrogelmaterialis46.72mg/g.

Keywords:grapheneoxide,naturalpolymer,compositehydrogel,cationicdye,adsorptionperformancGrapheneoxide/naturalpolymercompositehydrogelmaterialhasbeenwidelyresearchedduetoitsexcellentadsorptionperformance.Inthisstudy,wefocusedoncomparingtheadsorptionperformanceofthiscompositematerialwiththatofasinglenaturalpolymermaterialonmethylorange.

Theexperimentalresultsshowedthattheadsorptioncapacityofthegrapheneoxide/naturalpolymercompositehydrogelmaterialwassignificantlyhigherthanthatofasinglenaturalpolymermaterial.Themaximumadsorptioncapacityofthecompositematerialwasfoundtobe46.72mg/gundertheexperimentalconditionsofpH8,temperature35℃,ionstrength0.01mol/L,andinitialdyeconcentration100mg/L.

Thehighadsorptionperformanceofthecompositematerialcanbeattributedtoseveralfactors.Firstly,grapheneoxideprovidesalargenumberofactivesitesfortheadsorptionofmethylorangeduetoitshighspecificareaandabundantfunctionalgroups.Inaddition,thenaturalpolymerusedinthecompositematerialcanenhancethehydrophilicityofthehydrogel,therebyimprovingthediffusionofthedyemoleculesintothehydrogelandpromotingtheadsorptionprocess.

Overall,theresultsofthisstudydemonstratetheexcellentadsorptionperformanceofgrapheneoxide/naturalpolymercompositehydrogelmaterialonmethylorange,andhighlightthepotentialofthismaterialforwastewatertreatmentapplicationsFutureresearchdirectionsinthisfieldcouldincludeinvestigatingtheadsorptionperformanceofthecompositehydrogelonotherorganicpollutants,aswellasoptimizingthesynthesisprocesstoimprovetheefficiencyofthematerial.Theuseofothernaturalpolymersormodificationofthegrapheneoxidestructurecouldalsobeexploredtofurtherenhancethepropertiesofthehydrogel.

Inaddition,theapplicationofthismaterialinpracticalwastewatertreatmentprocesseswouldrequireadditionalconsiderations,suchasthescalabilityofthesynthesisprocessandthestabilityandreusabilityofthematerialinacontinuoustreatmentsystem.

Furthermore,theenvironmentalimpactsandsafetyconsiderationsofthesynthesisanduseofgrapheneanditsderivativesshouldalsobecarefullyconsideredinfutureresearch.Whilegrapheneandgrapheneoxidehavebeenshowntohavemanypotentialapplications,theirpotentialimpactsonhumanhealthandtheenvironmentneedtobefullyunderstoodbeforetheirwidespreaduse.

Inconclusion,thisstudydemonstratesthepotentialofgrapheneoxide/naturalpolymercompositehydrogelsfortheadsorptionoforganicpollutantsinwastewatertreatmentapplications.FurtherresearchinthisfieldcouldleadtothedevelopmentofmoreefficientandsustainabletreatmentprocessesforcontaminatedwaterresourcesGrapheneoxide/naturalpolymercompositehydrogelshaveshowntremendouspotentialinwastewatertreatmentapplications.However,therearestillseveralchallengesthatneedtobeaddressedbeforetheycanbewidelyused.Oneofthemajorchallengesisthehighcostoflarge-scaleproductionofgrapheneoxide.Effortsarebeingmadetodevelopcost-effectivemethodsforlarge-scaleproductionofgrapheneoxide,whichwillmakeitsusemorepractical.

Anotherchallengeisthepotentialenvironmentalandhealthimpactsofgraphene-basedmaterials.Althoughgrapheneoxideisbiocompatibleandnon-toxic,itslong-termeffectsonhumanhealthandtheenvironmentneedtobestudiedindetail.Studiesarecurrentlyunderwaytoinvestigatethepotentialtoxicityandenvironmentalimpactofgrapheneoxideandothergraphene-basedmaterials.

Inaddition,theperformanceofgrapheneoxide/naturalpolymercompositehydrogelsinreal-worldwastewatertreatmentapplicationsneedstobeevaluated.Moreresearchisneededtodeterminetheoptimalconditionsforusingthesematerialsinwastewatertreatmentsystems,includingfactorssuchaspH,temperature,andconcentrationofpollutants.

Finally,effortsareneededtodevelopmoresustainablewastewatertreatmentprocessesthatminimizetheuseofchemicalsandenergy.Grapheneoxide/naturalpolymercompositehydrogelsoffergreatpotentialinthisregard,astheyarehighlyefficientinremovingorganicpollutantsfromwastewaterandcanbeeasilyregeneratedforrepeateduse.

Inconclusion,grapheneoxide/naturalpolymercompositehydrogelshaveshowngreatpromiseinwastewatertreatmentapplications,andfurtherresearchinthisfieldisneededtofullyrealizetheirpotential.Withcontinuedadvancesintheproductionandcharacterizationofgraphene-basedmaterials,itislikelythatthesematerialswillbecomeincreasinglyimportantinaddressingtheglobalch