改性壳聚糖的制备及在电镀含铬废水中的应用

第37卷第6期陕西师范大学学报(自然科学版)Vol.37No.62009年11月JournalofShaanxiNormalUniversity(NaturalScienceEdition)Nov.2009:1672-4291(2009)06-0047-04:2009-02-20:(H20070015):,,..刘存海,朱玉凤,张光华(,,710021):以过硫酸铵和亚硫酸氢钠为引发剂,在N2保护下,以丙烯酰胺为接枝物,对壳聚糖进行改性,制得了壳聚糖接枝丙烯酰胺共聚物(CAM),并将其应用于处理电镀含铬废水.确定了以壳聚糖接枝共聚物在处理含铬废水中的最佳加入量,以及适宜的搅拌时间搅拌速度和最佳pH值等条件.结果表明,对电镀含铬废水进行絮凝处理时的CAM的最佳用量为2mg(CAM)/L(废水),pH值为7.8时,搅拌速度为200r/min,搅拌时间为3min,沉降时间为4h,其絮凝效果最好,铬的除去率达到94%.:壳聚糖;接枝;丙烯酰胺;重金属离子;絮凝:X703:AThepreparationofthemodifiedchitosananditsapplicationintreatingtheelectroplatingchromium-containingwastewaterLIUCun-hai,ZHUYu-feng,ZHANGGuang-hua(KeyLaboratoryofAuxiliaryChemistry&TechnologyforChemicalIndustry,MinistryofEducation,CollegeofChemistryandChemicalEngineering,ShaanxiUniversityofScienceandTechnology,Xian710021,Shaanxi,China)Abstract:Chitosanwasmodifiedbyacrylamidewithammoniumpersulfateandsodiumsulfiteasinitiatorsundertheprotectionofnitrogen.Theresultingproduct,chitosangraftingacrylamidepolymer(CAM),wasobtained.ApplicationofCAMintreatmentofeleceroplatingchromium-containingwastewaterwascarriedout.TheparametersincludingamountofCAM,treatedtime,stirringspeedandpHwereoptimized.Theoptimizedresultswereasfollows.AmountofCAMis2mg/L,thestirringspeedis200r/minmaintained3min,agingtimeis4h,pHkeepsat7.8.Theremovalrateforchromiumreaches94%.Keywords:chitosan;grafting;acrylamide;heavymetalion;flocculatingCr()Cr(),Cr()Cr(),Cr()1%..0.5mg/L,1.5mg/L[1].,,,,.,,,.11.1(80%,20);();();();1.2NDJ1();721();48陕西师范大学学报(自然科学版)第37卷;pHS3CpH.1.3(10.054g/L).1.4Cr()Cr()[2]:,1111,.5~10min,540nm,2mm,,,.1.5,,2%100mL,80%2g,15,,50,1%,30min,4h,,[3].(CAM).1.6Cr(VI),(6mol/L)pH2~3,Cr()(10%).,N-,,;,.1.725mL(50mL)(),pH,CAM,,.,CAM----pH-.22.1CAM.,.CAM,100000,.2.25%NaOH,,,,12h,.:=W--WW100%81%.2.3IR1.3438cm-12877cm-12360cm-1.IR2,3430cm-12920cm-12360cm-1,1670cm-1,.1Fig.1IRspectrumofchitosan2Fig.2IRspectrumofchitosanmodifiedbyacrylamide2.4CAM.;,,.(pH)第6期刘存海等:改性壳聚糖的制备及在电镀含铬废水中的应用49CAM,3min(200r/min),1min(50r/min),4h,3.3CAMFig.3EffectofamountsofchitosanandCAMonremovalofchromiuma.;b.3,CAM.CAM,,CAM.CAM2mg/L,,.CAM,,,;4,,,.,,CAM2mg/L,.4CAMFig.4EffectofamountofCAMonremovalchroniuma.4h;b.8h;c.12h;c.24h2.5CAM,,-5.5,,,;,,,.5Fig.5Effectofthestirringrateonremovalofchromium6Fig.6Effectofthestirringtimeonremovalofchromium6,,,,,,,;,,,.,200r/min,3min,,.2.67,,,,,4h,94%,,,12h,1%,.,4h.2.7pHpH,CAM,3min(200r/min),8,pH,;pH7.8,,.pH,,50陕西师范大学学报(自然科学版)第37卷7Fig.7Effectofagingtimeonremovalofchromium[4],,,.,,,COO[5],,8pHFig.8pHasfunctionofabsorbance,.,pH,..,,,.3(CAM),.,CAM,,,94%,.:[1].[M].:,1989.[2].[M].:,1989:157-161.[3],,.[J].,2002,36(5):541-544.[4],,.[J].,2003,23(12):45-47.[5],,.[J].,2005,27(5):50-52.责任编辑王勇