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《活性炭對(duì)木糖液脫色性能的研究》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、摘要本論文采用活性炭對(duì)木糖液進(jìn)行脫色,并對(duì)木糖液的色素成分進(jìn)行分析,根據(jù)活性炭表面化學(xué)及木糖液的色素成分,采用不同的改性方法對(duì)活性炭進(jìn)行改性以提高活性炭對(duì)木糖液的脫色率。研究中采用了KOH溶液、氨水、單寧酸溶液對(duì)活性炭進(jìn)行改性,考察改性前后活性炭對(duì)木糖液的脫色效果。采用XRD、FTIR及SEM分析手段,對(duì)活性炭性能進(jìn)行表征,結(jié)論如下:1.以O(shè).25%KOH溶液對(duì)活性炭進(jìn)行4~6h的處理,可以提高活性炭對(duì)木糖液的脫色率,與未改性的活性炭相比,其透光率由44%提高到50%。對(duì)木糖液中的蛋白質(zhì)、酚類化合物、鐵及糠醛的去除
2、率由43.5%、46.4%、6.40%、11.8%提高到53.0%、56.9%、16.3%、13.2%,并且KOH改性活性炭的堿性官能團(tuán)數(shù)量由0.314mmol·g‘1增加到0.534mmol·g~。2.以氨水對(duì)活性炭進(jìn)行改性處理,可以提高活性炭對(duì)木糖液的脫色率,與未改性的活性炭相比,對(duì)木糖液中的蛋白質(zhì)、酚類化合物、鐵及糠醛的去除率由43.5%、46.4%、6.40%、11.8%提高到53.3%、56.9%、8.52%、26.O%。氨水改性活性炭的堿性官能團(tuán)數(shù)量由0.314mmol·g’1增加到0.535mmol·
3、g~。3.以21.8mg·L以的單寧酸溶液對(duì)活性炭進(jìn)行改性,可以提高活性炭對(duì)木糖液的脫色率,與未改性活性炭相比,其透光率由44%提高到5l%。對(duì)木糖液中的蛋白質(zhì)、酚類化合物、鐵及糠醛的去除率由43.5%、46.4%、6.40%、11.8%提高到83.3%、50.O%、22.O%、18.7%,并且單寧酸改性活性炭表面官能團(tuán)的酚羥基數(shù)量由0.789mm01.g。1增加O.800mm01.g~。關(guān)鍵詞:活性炭;木糖液;脫色;改性StudyonDecolorationofXyloseSolutionbyActivatedC
4、arbonAbstractInpresentstudy,theactivatedcarbonwaschosenasanadsorbentfortheadsorptionofpigmentsinxylosesolutions.TheactivatedcarbonwasmodifiedbyKOH,NH3’H20andtannicacidinordertochangeitssurfacechemistry.Theadsorptionperformancesofactivatedcarbonbeforeandafterch
5、emicaltreatmentwereexaminedbymeasurementsthecontentsofpigmentsinxylosesolutions.TheinvestigationsusingSEM,XRD,F(xiàn)TIRindicatethatmodificationcreatesmorefunctionalgroupsandthusdepositsmoreparticlesizeonthesurfaceofactivatedcarbon.DecolorationofxylosesolutionbyKOHm
6、odified—activatedcarbonwasstudiedinthispaper.Theresultsshowedthattheactivatedcarbonwastreatedby0.25%KOHfor4~6hhadhighdecolorationeffectonnitrogen-containingmaterial,phenoliccompounds,ironcompoundsandfurfural.Aftertreatment,theremovalrateofabovecompoundsrespect
7、ivelychangedfrom43.50%、46.37%、6.40%、and11.83%to53%、56.87%、16.3l%and13.17%,andthelighttransmittanceofthexylosesolutionhasbeenchangedfrom44%to50%.TheamountsofbasicgroupsandadsorbentactivesitesonthesurfaceofactivatedcarbonareincreasedaftermodifyingbyKOH.Decolorat
8、ionofxylosesolutionbyNH3’H20modified—activatedcarbonwasstudied.TheresultsshowedthattheactivatedcarbonwastreatedbyNH3‘H20hadhighdecolorationeffectonnitrogen—containingmaterial,pheno