羧甲基化壳聚糖交联微球的制备及对Cu^(2+)的吸附性能研究

Preparation and the Adsorption Performance for Cu^(2+)of CM-CTS Crosslinked Microspheres

随着工业的发展,含重金属离子的工业废水对环境的污染越来越严重,使人们把注意转向了壳聚糖的研究。壳聚糖是一种可生物降解的天然高分子材料,对重金属离子有良好的吸附能力,但壳聚糖有水溶性差的缺点,必须对它进行改性。本论文以壳聚糖为原料,通过氯乙酸对壳聚糖进行羧甲基化,得到羧甲基化壳聚糖,再以环氧氯丙烷为交联剂,通过交联反应制得羧甲基化壳聚糖(CM-CTS)交联微球。红外光谱测试证明:所得产物为CM-CTS交联聚合物。通过扫描电镜表征,发现制得的CM-CTS交联聚合物呈现球状。吸附测试发现,CM-CTS交联微球3 h内对Cu^(2+)吸附率达到90.4%。CM-CTS交联微球可以有效吸附污水中Cu^(2+),可以用于处理重金属废水。

With the development of industry,the pollution of industrial wastewater containing heavy metal ions to the environment is becoming increasingly serious,leading people to turn their attention to the study of chitosan.Chitosan is a biodegradable natural polymer material with good adsorption ability for heavy metal ions,but it also has the disadvantage of poor water solubility and must be modified.This paper uses chitosan as the raw material and undergoes carboxymethylation of chitosan through chloroacetic acid to obtain carboxymethyl chitosan.Then,carboxymethyl chitosan(CM-CTS)crosslinked microspheres are prepared through crosslinking reaction using epichlorohydrin as the crosslinking agent.The infrared spectrum test proves that the obtained product is a CM-CTS cross-linked polymer.Through scanning electron microscopy characterization,it was found that the prepared CM-CTS crosslinked polymer exhibited a spherical shape.The adsorption test found that the CM-CTS crosslinked microspheres had a adsorption rate of 90.4%for Cu^(2+)within 3 hours.CM-CTS crosslinked microspheres can effectively adsorb Cu^(2+)in wastewater and can be used for the treatment of heavy metal wastewater.