超支化胶原纤维吸附剂对Cr_VI_的吸附特性和机理研究_王学川

《超支化胶原纤维吸附剂对Cr_VI_的吸附特性和机理研究_王学川》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、化学学报研究论文ArticleACTACHIMICASINICADOI:10.6023/A12080609超支化胶原纤维吸附剂对Cr(VI)的吸附特性和机理研究王学川*张斐斐强涛涛(陕西科技大学轻化工助剂化学与技术省部共建教育部重点实验室西安710021)摘要超支化聚合物改性胶原纤维(CF-HBPN)作为吸附剂处理含Cr(VI)模拟废水,研究了CF-HBPN吸附Cr(VI)时溶液pH、吸附剂用量和Cr(VI)初始浓度等对去除效率的影响;采用XPS,SEM-EDS等分析检测方法对CF-HBPN表面组成和结构进行表征,探索吸附机理.结果显示:CF-

2、HBPN对Cr(VI)的去除率随溶液pH降低而升高,在pH为3.0时达到最大,随吸附剂用量增大而增大,随Cr(VI)初始浓度增加而减小.CF-HBPN对Cr(VI)的吸附容量随吸附剂用量增加－1－1而减小,随Cr(VI)初始浓度增加而增加,最后趋于稳定.30℃时,4.0g•L的CF-HBPN对50mg•LCr(VI)溶液的去除－1－1率可达99.57%,最大吸附容量为38.94mg•g.0.18mol•L的NaOH溶液对吸附Cr(VI)后的CF-HBPN解吸效果最好.SEM-EDS分析结果表明CF-HBPN表面较粗糙,是一种具有空间网状结构的材

3、料,吸附过程存在离子交换.XPS分析结果表明Cr(VI)主要吸附在CF-HBPN表面,铬酸根阴离子与质子化氨基的静电吸附作用为主要吸附作用.关键词胶原纤维;Cr(VI);吸附;表征;机理CharacteristicandAdsorptionMechanismofHyperbranchedCollagenFibertowardCr（VI）Wang,Xuechuan*Zhang,FeifeiQiang,Taotao(KeyLaboratoryofChemistryandTechnologyforLightChemicalIndustry,Minis

4、tryofEducation,ShaanxiUniversityofScienceandTechnology,Xi'an710021,China)AbstractHyperbranchedpolymermodifiedcollagenfiberwasusedasanovelabsorbenttoremovehexavalentchromiumfromsimulatedchromesolution.VariousfactorsinfluencingtheuptakeofCr(VI),namely,quantityofabsorbent,pH,th

5、econcentrationofthesimulatedchromesolutionandthedurationoftreatmenthadbeenstudied.Theexperimentalresultindi-catedthatthemodifiedcollagenfiberwasveryeffectiveforremovingCr(VI)fromsimulatedchromesolution.TheremovalofCr(VI)increasedwiththedecreaseofsolutionpHvalues.Themaximumra

6、teofremovalwasattainedatpH3.0.Thein-creaseofabsorbentdosagewouldraisetheremovalefficiency,butitwouldsimultaneouslyreducetheadsorptioncapacity.Moreover,theremovalrateofCr(VI)wasfoundtodecreasewiththeincreasingofinitialconcentrationofCr(VI).AtpH3.0,－1thetemperatureof30℃,4.0g•L

7、modifiedcollagenfiber,therateofremovalcouldreach99.57%.Whereas,theCr(VI)uptakecapacityincreasedwiththeincreaseofCr(VI)initialconcentrationuntilreachingsaturation,whichwasfoundtobe－1－138.94mg•gatpH3.0,30℃andtheinitialconcentrationof400mg•L.Severaldesorptionsolutionswereusedto

8、analyze－1thedesorptionprocesswhilethe0.18mol•LNaOHsolutionwasthebest.Furthe