无机基质负载交联壳聚糖的制备及对hg-%272%2b-和pb-%272%2b-吸附性能的研究

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1、摘要无机基质负载交联壳聚糖的制备及对H92+和Pb2+吸附性能的研究将表观粘度为760mPa·s的壳聚糖(cTsl#)和100mPa·s的壳聚糖(cTs2#)分别负载在层析硅胶和人造沸石上制得了层析硅胶负载壳聚糖(Si．CTS)和人造沸石负载壳聚糖(沸石．CTS)，然后分别于乙二醇和2％的乙酸溶液中以50％戊二醛为交联剂在微波辐射下制得了硅胶负载交联壳聚糖(Si．ccTs)和沸石负载交联壳聚糖(沸石．ccTs)；用SEM、FTIR、w越①和TG对无机基质负载壳聚糖、无机基质负载交联壳聚糖进行了结构和性能的表征；测定了壳聚糖在无机基质上的负载量；研究了pH值、溶液的初始浓度对无

2、机基质负载交联壳聚糖吸附性能的影响及吸附剂对标准溶液和麻黄水提液消解液中Pb2+和H92+的吸附性能和吸附剂的再生性。SEM结果表明壳聚糖部分包覆在无机基质上；壳聚糖在层析硅胶和人造沸石上的负载量随着壳聚糖用量的增加而增大；FT瓜、WAxD和TG的结果表明以2％的乙酸溶液为溶剂时发生了交联反应；对Pb2+而言，吸附的最佳pH=4~6，吸附率随初始浓度的增大先增大后减小，对H孑+而言，吸附率随pH值和初始浓度的增大而增大；对标准溶液和麻黄水提液消解液中Pb2+和H92+的吸附实验结果表明CTSl#的吸附效果优于CTS2#，si．CTS和沸石．CTS的吸附效果优于单一的壳聚糖、层

3、析硅胶和人造沸石；北京化工大学硕上学位论文无机基质负载交联壳聚糖的吸附性能较未交联时有所下降。关键词：壳聚糖，硅胶，人造沸石，H矿，Pb2+，吸附性能，麻黄IIPREPARATIONANDADSoRPTIoNPRoPERTYOFCRoSSLINKEDCHIToSANSUPPoRTEDBYINoRGANICSUBSTANCESFoRH92+ANDPb2+ABSTRACTChitosanwithadegreeofdeace锣lationofmore廿lan90％，whoseapparentviscos时in洲duallyis760mPa。s(CTS1撑)舭d100lIlPa’s(

4、CTS2拌)weresupportedbysilicongelandpemlutitetoprepareSi-CTS锄dpemlutite．CTS．using西ycoland2％aceticacids01utionassolventand50％glutamldehydeascross—linkingagent，Cross—lir血edc11itosailsupportedbysilicongel(Si-CCTs)aIldcrosslilll(edchitosaJlsupponedbype咖utite(pe埘utbCCTS)werep唧aredu11dermicrowavera

5、diation．Thestmctureandpr叩ertiesofchitosansuppo慨dbyinorganicsubsta苴1cesandcross—litlkedchitosansupponedbyinorganicsubstanceswerestudiedbySEM，FTIR，WAXDaJldTG．Theloadingn眦1berofchitosalls叩ponedbyinorganicsubs啪ceswasmeasured．E脏ctofpHandinitialconcen仃ationonmeadsorptionpropeniesofcross-linkedchn

6、osanand也eadsorptionpropertiesofadsorbentsforPb2+aIldH酽+instandardsolutionsa11dephedra’sclearingupIII北京化工大学硕上学位论文solutionsandmeregeneratedpropertiesofadsorbents、verestudied．SEMindicatedthatCTSp眦iallyloadedonSilicongelaIldpemutiteLoadingnumberincreased讲tllm(CTS)／m(inorganicsubstance)．FTIR，WAX

7、DandTGshowedt11atcrosslinkingreactionoccurredwhen2％aceticacids01utionwasusedass01vem．ForPb”，meoptimalpHis4to6，meadsorptionrateincreasedfirstandthendecreasedwi廿1廿1eincfeasiI培ofi11itialconcentration．ForHg”，theadsorptionrateincreasedwitllmeincreasingofpHaIl