羧甲基甲壳胺纤维对铜离子的吸附性能

The Absorption of Cu(II) Ions by Carboxymethylated Chitosan Fibers

为了提高甲壳胺纤维对重金属离子的吸附性能,用氯乙酸对纤维进行改性处理,在纤维的结构中引入羧甲基团后使纤维同时具有能结合重金属离子的胺基和羧酸基团。研究了改性后纤维在不同的改性程度、添加量、时间、温度、pH值等条件下对铜离子的吸附性能。结果表明:羧甲基化改性后的甲壳胺纤维对铜离子有很好的吸附性能。在同样的条件下,未改性的纤维对铜离子的吸附值为41.3mg/g,而改性后的纤维为79.4mg/g。经过羧甲基化改性的甲壳胺纤维对铜离子的饱和吸附容量可以达到148.1mg/g。

In order to improve the ability of chitosan fibers to absorb heavy metal ions, the chloro-acetic acid was used to modify chitosan fibers and the carboxymethyl groups were introdued into the fiber structure, enabling the fiber to have both amine and carboxylic acid groups. Fibers with different levels of carboxymethylation were prepared and their absorption properties for Cu （Ⅱ） ions were studied at different concentrations, temperature, time and pH. Results showed that the carboxymethylated chitosan fibers had good absorption properties for Cu （Ⅱ） ions. Under the same conditions, the absorption capacity for Cu（Ⅱ） ions for the untreated fiber was 41.3 mg/g, whilst it was 79.4 mg/g for the carboxymethylated fiber. The maximum absorption capacity for Cu（Ⅱ） was 148.1 mg/g for the modified chitosan fiber.