制备一种具有快速吸附速率和高吸附容量的用于去除阳离子染料的聚丙烯酸基水凝胶。

Preparation of a poly(acrylic acid) based hydrogel with fast adsorption rate and high adsorption capacity for the removal of cationic dyes.

作者信息

Yuan Zhenyu, Wang Jie, Wang Yiming, Liu Qian, Zhong Yujie, Wang Yu, Li Li, Lincoln Stephen F, Guo Xuhong

机构信息

State Key Laboratory of Chemical Engineering, East China University of Science and Technology 200237 Shanghai P. R. China

Department of Chemical Engineering, Delft University of Technology 2629 HZ Delft The Netherlands.

出版信息

RSC Adv. 2019 Jul 5;9(37):21075-21085. doi: 10.1039/c9ra03077h.

A biocompatible Dex-MA/PAA hydrogel was prepared through copolymerization of glycidyl methacrylate substituted dextran (Dex-MA) with acrylic acid (AA), which was applied as the adsorbent to remove cationic dyes from aqueous solutions. Dex-MA/PAA hydrogel presented a fast adsorption rate and the removal efficiency of Methylene Blue (MB) and Crystal Violet (CV) reached 93.9% and 86.4%, respectively within one minute at an initial concentration of 50 mg L. The adsorption equilibrium data fitted the Sips isotherm model well with high adsorption capacities of 1994 mg g for MB and 2390 mg g for CV. Besides, dye adsorption occurred efficiently over the pH range 3-10 and the temperature range 20-60 °C. Moreover, the removal efficiencies for MB and CV were still >95% even after five adsorption/desorption cycles which indicates the robust nature of the Dex-MA/PAA hydrogel and its potential as an eco-friendly adsorbent for water treatment.

通过甲基丙烯酸缩水甘油酯取代的葡聚糖（Dex-MA）与丙烯酸（AA）共聚制备了一种生物相容性的Dex-MA/PAA水凝胶，该水凝胶用作吸附剂以从水溶液中去除阳离子染料。Dex-MA/PAA水凝胶呈现出快速的吸附速率，在初始浓度为50 mg/L时，亚甲基蓝（MB）和结晶紫（CV）在一分钟内的去除效率分别达到93.9%和86.4%。吸附平衡数据很好地拟合了Sips等温线模型，对MB的吸附容量高达1994 mg/g，对CV的吸附容量为2390 mg/g。此外，在pH值为3 - 10和温度范围为20 - 60°C时，染料吸附有效地发生。而且，即使经过五次吸附/解吸循环后，MB和CV的去除效率仍>95%，这表明Dex-MA/PAA水凝胶的稳健性质及其作为一种用于水处理的环保吸附剂的潜力。