阳离子壳聚糖对汞离子的吸附性能研究

Study on the Adsorptive Ability of Cationic Chitosan for Mercury Ion

在壳聚糖-NH2上接枝阳离子中间体,增加了阳离子基团及羟基,制备成阳离子壳聚糖。考察了时间、温度以及pH对阳离子壳聚糖吸附汞离子的影响。45℃、吸附时间20min,pH为5的条件下,阳离子壳聚糖对Hg2+的吸附效果最好,最大吸附量可达262.50mg/g。试验表明,阳离子壳聚糖对汞离子的吸附性能明显优于壳聚糖和活性炭。

Intermediates are grafted on the hydroxyl,amine and acetamide groups of the chitosan, increasing the positive ion and the hydroxyl, modified chitosan is synthesized. The factors influencing the adsorption for mercury such as the time, temperature as well as pH are discussed. The adsorptive capacity can even reach 262.50mg/g when cationic chitosan is under such conditions that the temperature is 45℃,adsorption time is 20min and pH is 5. Experiment shows that adsorptive ability of cationic chitosan for mercury ion is better than chitosan and activated carbon.