甘氨酸及5-氨基水杨酸改性淀粉对Cd(Ⅱ)的吸附性能研究  

ADSORPTION OF Cd(II) BY GLYCINE- AND 5-AMINOSALICYLIC ACIDS-MODIFIED STARCH

作　　者：曹玮[1] 吕彤[2] 崔莉[1] 杜晓[1] 王君[2] 

机构地区：[1]天津工业大学环境与化学工程学院,天津300387 [2]天津工业大学材料科学与工程学院,天津300387

出　　处：《离子交换与吸附》2016年第1期77-86,共10页Ion Exchange and Adsorption

摘　　要：以淀粉(Starch)为基体,接枝甲基丙烯酸缩水甘油酯(GMA)后得到starch-g-GMA,再分别将甘氨酸(Gly)或5-氨基水杨酸(ASA)修饰在starch-g-GMA上,形成2种对Cd(Ⅱ)具有优良吸附效果的新型改性淀粉螯合剂starch-g-GMA-Gly和starch-g-GMA-ASA。借助红外光谱、扫描电镜、元素分析仪等表征了改性淀粉螯合剂的结构,通过原子吸收光谱仪测试了改性淀粉螯合剂对Cd(Ⅱ)的静态吸附性能。结果表明,上述改性淀粉螯合剂对Cd(Ⅱ)的吸附过程均符合准二级动力学方程,且吸附等温线用Freundlich模型拟合效果优于Langmuir模型。starch-g-GMA-Gly和starch-g-GMA-ASA对Cd(Ⅱ)的平衡吸附量均较大,分别达到130mg/g和149mg/g。Two novel modified chelating starch were prepared by reaction of starch grafted with glycidyl methacrylate （starch-g-GMA） and glycine （Gly） or 5-aminosalicylic acid （ASA）. The results of FT-IR analysis, scanning electron microscope and elemental analysis indicated that glycine or 5-aminosalicylic acid was successfully modified on starch-g-GMA, and static adsorption capacities of modified starch chelating agents for heavy metal ions Cd（II） were tested by atomic absorption spectrometer. The results showed that for two modified starch chelating agents, the adsorption could be described by the Pseudo-second-order kinetic model and Freundlich isotherm model. The equilibrium adsorption capacity of Cd（II） on starch-g-GMA-Gly and starch-g-GMA-ASA were 130mg/g and 149mg/g, respectively.

关 键 词：改性淀粉 静态吸附 Ca(II) 动力学 吸附等温线 

分 类 号：TQ31[化学工程—高聚物工业]