盐酸和硝酸介质中己二胺接枝壳聚糖微球吸附Hg(Ⅱ)的行为  

1,6-diaminohexane-modified chitosan microspheres for adsorption of Hg(Ⅱ) in the medium of hydrcoloric and nitric acid

作　　者：张梦霜[1] 李步海[1] 

机构地区：[1]中南民族大学化学与材料科学学院,分析化学国家民委重点实验室,武汉430074

出　　处：《环境工程学报》2012年第4期1202-1206,共5页Chinese Journal of Environmental Engineering

基　　金：国家民委院校科研基金资助项目(MJY00004)

摘　　要：制备并表征了氯化和氨化壳聚糖微球,考察了己二胺接枝壳聚糖微球(HDA-CS)在盐酸和硝酸介质中吸附Hg(Ⅱ)的行为及影响因素。结果表明,盐酸介质中,pH 3.0时,HDA-CS对Hg(Ⅱ)有较高的初始吸附速率,最大吸附容量为128.6 mg/g;硝酸介质中,pH 3.5时,它对Hg(Ⅱ)的最大吸附容量为37.7 mg/g。前者是后者的3.4倍。以1.0 mol/L的H2SO4为解吸剂,HDA-CS复用3次无溶解和流失现象。HDA-CS对Hg(Ⅱ)的吸附主要是质子化氨基与汞配阴离子以静电引力实现的。Ammoniation and chlorination-modified chitosan microspheres were prepared and characterized.In the medium of hydrochloric and nitric acid the adsorption behaviour and influence factors of hexamethylene diamine-modified chitosan microspheres（HDA-CS） for enhancement of Hg（Ⅱ） were investigated.The results indicated that HDA-CS had higher adsorption rate of Hg（Ⅱ） at pH 3.0,the maximum adsorption capatities were 128.6 mg/g in hydrochloric medium;but the maximum adsorption capatities were only 37.7 mg/g in nitric acid medium（pH 3.5）.The adsorption capacies of the former was 3.4 times of the latter.The regeneration experimets were carried out for three cycles by using 1.0 mol/L H2SO4 solution as eluent,the adsorbent had no dissolution and running off.The adsorption of HDA-CS for Hg（Ⅱ） could be carried out by a electrostatic attaction between amino-group of peotonation the surface of on HDA-CS and the complex anion of Hg（Ⅱ） with chlorine anion.

关 键 词：壳聚糖 己二胺 环氧氯丙烷 吸附 Hg(Ⅱ) 

分 类 号：X703[环境科学与工程—环境工程]