两种交联氨基淀粉对水中Cu^(2+)的吸附性能  

Adsorption Performance of Two Kinds of Cross-Linking Amino Starches for Cu( Ⅱ) in Aqueous Solution

作　　者：韦晓燕[1,2] 谭军[1,2] 欧阳玉霞[1,2] 范举红 刘锐 

机构地区：[1]嘉兴学院南湖学院化学与纺织工程系,浙江嘉兴314001 [2]嘉兴学院生物与化学工程学院,浙江嘉兴314001 [3]浙江清华长三角研究院生态环境研究所,浙江嘉兴314006

出　　处：《净水技术》2014年第5期58-64,共7页Water Purification Technology

基　　金：浙江省公益性技术应用研究计划项目(2012C31028);国家863高技术发展计划重大项目(2012AA06A304);浙江省水质科学与技术重点实验室开放基金(No.2012ZJWST005);嘉兴学院南湖学院2013年科研重点课题(N41472001-3)

摘　　要：研究了含C—N键的氨基淀粉(CAS)与含CN键的氨基淀粉(DAS)对重金属离子Cu2+的吸附性能,包括吸附动力学、吸附等温线和吸附热力学。结果表明CAS比DAS的吸附容量更大,Cu2+去除率更高;CAS适用的p H为5~7,DAS适用的p H为4~4.5;两者对Cu2+的吸附均符合拟二级动力学;CAS对Cu2+等温吸附符合Freundlich型,为非均相表面吸附;DAS吸附则是单层吸附;两种氨基淀粉对Cu2+的吸附过程均为吸热、熵增、自发的过程。The adsorption properties of amino starch with C-N ligand （CAS） were compared with amino starch with CN ligand （DAS ） for Cu2＋ removal from aqueous solution. Furthermore, the adsorption kinetics, adsorption isotherms and adsorption thermodynamics of these two amino starches were also studied. The results show CAS has better removal efficiency and higher adsorption capacity for Cu2＋;the adsorption capacity of CAS reaches the maximum when pH is 5 ~7,and that of DAS reaches maximum when pH is 4~4. 5;both of them follow the pseudo-second-order kinetic model. The adsorption equilibrium data of CAS are correlated well with Freundlich isotherm while those of DAS are more fitted with Langmuir isotherm,which means the surface of CAS is heterogeneous and that of DAS is monolayer and homogeneous. The adsorption of Cu2＋on two amino starches is spontaneous and endothermic processes with increased entropy.

关 键 词：CU2+ 氨基淀粉 等温吸附 吸附动力学 吸附热力学 

分 类 号：TS231[轻工技术与工程—粮食、油脂及植物蛋白工程]