O-羧甲基壳聚糖纳米微粒制备及对Ni^(2+)吸附研究  

Preparation of O-carboxymethyl chitosan nanoparticle and studies on its adsorption for Ni^(2+)

作　　者：谢宇[1] 胡金刚[1] 魏娅[1] 李明俊[1] 陈素华[1] 史少欣[1] 

机构地区：[1]南昌航空大学环境与化学工程学院,江西南昌330063

出　　处：《化学研究与应用》2009年第12期1632-1636,共5页Chemical Research and Application

基　　金：国家自然科学基金(20807021)资助项目;江西省自然科学基金(0620071)资助项目;江西省教育厅科技项目(赣教技字[2007]168号)资助项目;航空高校基金(EA200502138)资助项目

摘　　要：将壳聚糖与氯乙酸反应,通过控制反应条件制备了取代度为0.71的O-羧甲基壳聚糖,将改性后的O-羧甲基壳聚糖与多聚磷酸钠反应,制备了粒径分布在370-710nm的O-羧甲基壳聚糖纳米微粒,透射电镜观察表明该微粒呈球状,平均粒径为450nm。在此基础上研究了O-羧甲基壳聚糖纳米微粒对工业电镀镍废水Ni2+吸附性能,考察了溶液pH、Ni2+起始浓度、平衡吸附时间、粒径等因素的影响,结果表明:O-羧甲基壳聚糖微粒最佳吸附条件是Ni2+溶液pH为8.0、Ni2+溶液起始浓度为33.28mg/ml、平衡吸附时间为0.5h、粒径较小的O-羧甲基壳聚糖纳米微粒对Ni2+的吸附量要大于粒径较大的吸附量。The O-carboxymethyl chitosan with 0.71 substitution degree was prepared by chitosan and monochloroacetic acid reaction under the controlled conditions. By the ion gelatin method, a certain concentration of poly-phosphate responsed with the different concentration O-carboxymethyl chitosan solution. The O-carboxymethyl chitosan nanoparticles with particle size distribution in 370- 710 nm was formed. TEM observation showed that the spherical nanoparticles had an average diameter of 450 nm. The O- carboxymethyl chitosan nanoparticles to Ni^2＋ adsorption properties including The solution pH value, Ni^2＋ initial concentration, equilibrium adsorption time and nanoparticle size which had effect on O-carboxymethyl chitosan nanoparticles adsorption Ni^2＋ were investigated. The result suggested that the optimum adsorption condition of O-carboxymethyl chitosan nanoparticles for Ni^2＋ is that the pH value was 8.0, Ni^2＋ initial concentration was 33.28mg/ml, and equilibrium adsorption time was 0. 5h. Through the comparation of different particle size O-carboxymethyl chitosan nanoparticles adsorption ability, the result discovered that the smaller the O-carboxymethyl chitosan nanoparticles size has,the stronger the adsorption ability to Ni^2＋.

关 键 词：O-羧甲基壳聚糖 纳米微粒 NI2+ 吸附性能 

分 类 号：O629.1[理学—有机化学]