柠檬酸-β-环糊精共聚物对铜离子的吸附性能

Citric Acid-Beta-Cyclodextrin Copolymer Preparation and Absorption Property of Cu(Ⅱ)

为吸附污水中的铜离子,以柠檬酸与β-环糊精为单体,在磷酸二氢钠的催化下体形缩聚制备了柠檬酸-β-环糊精共聚物(CDP),并采用静态吸附法研究CDP的铜离子吸附特性。结果表明:CDP用量、铜离子溶液的初始浓度、pH值、吸附温度,以及吸附时间对最终吸附结果均有影响;当吸附剂用量为0.5 g时,铜离子溶液的初始浓度为600 mg·L^(-1),溶液pH值为7,吸附时间为24 h,吸附温度为30℃时,CDP对铜离子吸附容量最大,为18.15mg·g-1;CDP的等温吸附符合Freundlich多层吸附模型,吸附动力学符合一级动力学方程。

In this paper,citric acid-beta-cyclodextrin copolymer( CDP) is studied as an adsorbent of Cu( Ⅱ). Citric acid and beta-cyclodextrin are reacted,with Na H2 PO4 as catalyst to obtain CDP. The adsorption behaviors of CDP are further studied. Results indicate that the CDP usage,initial concentration of Cu( Ⅱ),adsorption temperature,p H and contact time can impact the CDP's adsorption capacity. Meanwhile,adsorption kinetics of Cu( Ⅱ) followed the pseudo-first-order model,and fit better in the Freundlich model,inferring a multilayer adsorption. CDP reached its max adsorption capacity of Cu( Ⅱ),18. 15 mg·L-1,with CDP usage of 0. 5 g,initial Cu( Ⅱ) concentration of 600 mg·L-1,contact time of 24 h,and adsorption temperature of 30 ℃.