Inthisresearch,theresiduesofsunflow

Inthisresearch,theresiduesofsunflower,potato,canola,andwalnutshellwereusedassorbentstosorbheavymetals(Fe,Mn,Zn,Ni,Cu,andCd)fromaqueoussolutionsusingbatchexperiments.TheeffectofpHandcontacttimewasinvestigated.MaximumsorptionofheavymetalsbydifferentsorbentswasobservedaroundpH4–8.Theoptimalcontacttimewasintherangeof20–600min.ThevaluesofpHzpc(zeropointofcharge)measuredforsunflower,potato,canola,andwalnutshellresidueswere6.06,6.80,6.15and5.85,respectively.TheplantresiduesshowedconsiderablecapacityforremovalofFe,Mn,Zn,Cu,andCdfromaqueoussolutionbutNisorptionbyresidueswasnegligible.ChemicalactivationofsorbentswithNaOHenhancedNisorption.Competitivesorptiondecreasedtheremovalofheavymetalscomparedtothesinglesystem.TheLangmuirisothermmodelfittedwelltoexperimentalmetalssorption.Thesorptionkineticofheavymetalswasdescribedwellbypseudosecondordermodel.Inourstudy,thesorptionmechanismssuchaselectrostaticattractionandionexchangeaswellascomplexationseemtobethemostoccurringphenomena.©2015TaiwanInstituteofChemicalEngineers.PublishedbyElsevierB.V.Allrights

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inthisresearch theresiduesofsunflower , มันฝรั่ง , คาโนลา , andwalnutshellwereusedassorbentstosorbheavymetals ( Fe , Mn , Zn , Cu , Ni , andcd ) fromaqueoussolutionsusingbatchexperiments . theeffectofphandcontacttimewasinvestigated . maximumsorptionofheavymetalsbydifferentsorbentswasobservedaroundph4 – 8 theoptimalcontacttimewasintherangeof20 – 600min . thevaluesofphzpc ( zeropointofcharge ) measuredforsunflower , มันฝรั่ง , คาโนลา ,andwalnutshellresidueswere6.06,6.80,6.15and5.85 ตามลำดับ theplantresiduesshowedconsiderablecapacityforremovaloffe , แมงกานีส , สังกะสี , ทองแดง , andcdfromaqueoussolutionbutnisorptionbyresidueswasnegligible.chemicalactivationofsorbentswithnaohenhancednisorption.competitivesorptiondecreasedtheremovalofheavymetalscomparedtothesinglesystem.thelangmuirisothermmodelfittedwelltoexperimentalmetalssorption .thesorptionkineticofheavymetalswasdescribedwellbypseudosecondordermodel . inourstudy thesorptionmechanismssuchaselectrostaticattractionandionexchangeaswellascomplexationseemtobethemostoccurringphenomena , 2015taiwaninstituteofchemicalengineers . สงวนลิขสิทธิ์ . publishedbyelsevierb v.allrights
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