摘要
以玉米淀粉为原料 ,经交联、间接醚化、胺化反应合成了交联氨基淀粉 (CAS) ,CAS进一步与CS2 亲核加成反应 ,合成了带有二硫代氨基甲酸 (DTC)基团的DTC改性淀粉(DTCS) .研究了CAS和DTCS吸附铜离子的动力学行为 ,结果表明 ,二者对铜的吸附均符合Freundlich等温式 .2 98K时 ,CAS和DTCS的吸附速率常数分别为k =1 75 8h- 1 和k =1 0 32h- 1 .根据对吸附行为的研究得到了表观动力学方程和热力学参数 。
Starting frorn corn starch,dithiocarbamate modified starch was prepared by the reactions of crosslinking,indirectly etherified,amination with ethylenediamine,and nucleophilic addition with carbon disulfide,sequentially.The two products,cross linded amino starch(CAS)and dithiocarbamate modified starch(DTCS)were efficient to asdorption for copper ion with characteristic of Langmuir and Freundlich isothermal equation.At 298K,the adsorption rate constants for CAS and DTCS was k =1 758h -1 and k =10 32h -1 ,respectively.Apparent kinetic equation and some thermodynamic parameters were got in this paper.Characteristics of CAS and DTCS and adsorption mechanism were studied by IR,elemental analysis and adsorption equilibrium experiments.
出处
《环境化学》
CAS
CSCD
北大核心
2004年第2期193-197,共5页
Environmental Chemistry
