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1、第25卷第5期化學(xué)研究與應(yīng)用Vo1.25,No.52013年5月ChemicalResearchandApplicationMay,2013文章編號(hào):1004—1656(2013)05-0706-07新型交聯(lián)羧甲基葡甘聚糖凝膠球?qū)δ蛩氐奈叫阅茏坷颍醣?,唐艷娟(1.內(nèi)江師范學(xué)院化學(xué)化工學(xué)院,四川內(nèi)江641112;2.果類廢棄物資源化四川省高等學(xué)校重點(diǎn)實(shí)驗(yàn)室,四川內(nèi)江641112)摘要:本文用CuSO溶液處理羧甲基葡甘聚糖制得了一種新型吸附材料一羧甲基葡甘聚糖銅凝膠球,研究了該凝膠球?qū)δ蛩氐奈叫阅?。分別考察了吸附時(shí)問(wèn)、羧甲基葡甘聚糖濃度、CuSO濃度、pH值、溫度和尿素濃度對(duì)吸附
2、的影響,同時(shí)用紅外光譜初步表征了cu“交聯(lián)羧甲基葡甘聚糖凝膠球一尿素復(fù)合物的結(jié)構(gòu)。結(jié)果表明:310K時(shí),凝膠球?qū)δ蛩氐奈椒磻?yīng)在9h時(shí)達(dá)平衡。當(dāng)羧甲基葡甘聚糖濃度為2%,Cu質(zhì)量分?jǐn)?shù)為2%,尿素濃度為800mg·L時(shí),pH值為6.5,吸附量為101.85mg·g~。根據(jù)不同溫度下凝膠球吸附尿素的等溫線,計(jì)算了吸附過(guò)程的熱力學(xué)參數(shù),同時(shí)用Freundlich方程對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行了擬合,發(fā)現(xiàn)該方程適用于所研究的吸附體系。該體系為自發(fā)放熱過(guò)程,體系熵減少,降溫有利于吸附。關(guān)鍵詞:葡甘聚糖;羧甲基化;尿素;銅凝膠球;吸附中圖分類號(hào):0647.314文獻(xiàn)標(biāo)志碼:AAdsorptionbehav
3、iorsofanewcross-linkedcarboxymethylglucomannanmicrospheresforureaZHUOLi,WANGBi,,TANGYan-juan(1.CollegeofChemistryandChemicalEngineering,NeijiangNormalUniversity,Neijiang,Sichuan641112,China;2.KeyLaboratoryofFruitWasteTreatmentandResourceRecyeling,Neijiang,Sichuan641112,China)Abstract:Coppercar
4、boxylmethylkonjaeglueomannangelmierospheres(CMKGM-Cu)werepreparedbycrosslinkingcopperion(Cu).Onthisbasis,theadsorptioncapacityofCMKGM—Cuforureawasstudied.ThecomplexofCMKGM—Cu/ureawascharac·terizedbyIRspeetrometry.Severalparametersincludingtheadsorptiontime,temperature,microspheresize,pHvalue,a
5、ndthecon—centrationsofCMKGM,CuSO4,andureawereinvestigated.Theresultsshowedthattheadsorptionequilibriumcouldbeestablishedabout9hours.Whenthetemperaturewas310K,theconcentrationofCCMKGMwas2.O%,themassratioofCu“was2.0%,theconcentrationofureawas800mg·L~andpHvaluewas6.5.theadsorptioncapacityattained
6、101.85rag·g~.Accordingtothead—sorptionisothermsofureaonCMKGM-Cu,thethermodynamicparametersofadsorptionprocesswerecalculated.TheexperimentaldatawerefittedwithFreundlichequation,anditwasfoundthattheequationwassuitableforthestudyoftheinvestigatedadsorptionsystem.Theentropyvalueofthesystemisnegati
7、ve,andcoolingisbeneficialfortheadsorption,suggestingthatthesystemisaspon-taneousexothermicprocess.Keywords:Ko~aeGlucomannan(KGM);earboxylmethyl;urea;coppergelmierophere;adsorption收稿日期:2012-09—10;修回日期:2013-03—11基金項(xiàng)目:四川省教育廳自然科學(xué)重點(diǎn)項(xiàng)目(2012ZA