Page 93 - 《精细化工》2020年第4期

第 37 卷第 4 期 精 细 化 工 Vol.37, No.4
202 0 年 4 月 FINE CHEMICALS Apr. 2020

功能材料
EDTA 改性 P(AA-AMPS)/SA 耐水解水凝胶的制备

3+
2+
及其对 Cu 、Cr 的吸附性能

*
王向鹏，郑云香，宗丽娜，张春晓
（中国石油大学胜利学院 化学工程学院，山东 东营 257061）

摘要：以海藻酸钠（SA）为原料，丙烯酸（AA）、2-丙烯酰胺-2-甲基丙磺酸（AMPS）为单体，四烯丙基溴化
铵（TAAB）为交联剂，EDTA 二钠为添加剂，制备了改性耐水解多孔水凝胶 P(AA-AMPS)/SA，对水凝胶吸水
2+
3+
性能及其对 Cu 、Cr 的吸附性能进行了测定，探究了凝胶吸附等温线及吸附动力学，利用 FTIR、SEM、AFM
对凝胶表面形态进行了分析。结果表明，SA 的加入可提高水凝胶的溶胀速率，制备的改性水凝胶具有优异的耐
水解性能，pH=7、125 ℃下在水溶液中的吸水倍率可达 350.4 g/g；EDTA 二钠的加入及溶液 pH 增大均有利于
3+
2+
提高水凝胶对 Cu 、Cr 的吸附性能。在吸附温度为 20 ℃，pH 为 7，吸附时间为 1 h 时，水凝胶（0.1 g）在
2+
CuCl 2 (0.07 mol/L)、CrCl 3 (0.05 mol/L)溶液中的吸附量最大，分别为 539.2、286.7 mg/g。水凝胶对 Cu 的吸附机
3+
理符合 Langmuir 吸附等温式，对 Cr 的吸附符合 Freundlich 模型。吸附均为自发放热过程，吸附温度升高，达
到吸附平衡的时间缩短，吸附量略有降低。
关键词：耐水解；吸附性能；改性；凝胶；动力学；功能材料
中图分类号：X703；TQ427.26 文献标识码：A 文章编号：1003-5214 (2020) 04-0727-08

Preparation of EDTA modified P(AA-AMPS)/SA hydrogels with hydrolysis
3+
2+
resistance and its adsorption properties of Cu and Cr
*
WANG Xiangpeng, ZHENG Yunxiang, ZONG Lina, ZHANG Chunxiao
（School of Chemical Engineering, Shengli College China University of Petroleum, Dongying 257061, Shandong,
China）

Abstract: Porous P(AA-AMPS)/SA hydrogels with hydrolysis resistance were prepared using sodium
alginate (SA) as raw material, acrylic acid (AA), 2-acrylamido-2-methylpropane sulfonic acid (AMPS) as
monomers, tetraallylammonium bromide (TAAB) as crosslinker, and ethylenediaminetetraacetic acid
disodium salt (EDTA-2Na) as modifying agent. The water absorbency and adsorption performances of
2+
3+
hydrogels for Cu and Cr were measured. The adsorption isotherm and adsorption kinetics of the
hydrogels were studied. The surface morphology of hydrogels was analyzed by FTIR, SEM and AFM. The
results showed that the addition of SA could improve the swelling rate of hydrogels. The prepared
hydrogels had excellent hydrolysis resistance. The water absorbency of hydrogel in water solution reached
350.4 g/g at 125 ℃ and pH=7.0. The introduction of EDTA-2Na and the increase of pH value of solution
2+
3+
were beneficial to improve the adsorption performances of the hydrogel for Cu and Cr . Under the
conditions of 20 ℃, pH=7, and adsorption time 1 h, the maximum adsorption capacity of 0.1 g hydrogel
reached 539.2 mg/g in 0.07 mol/L CuCl 2, and 286.7 mg/g in 0.05 mol/L CrCl 3, respectively. The adsorption
3+
2+
of the hydrogel for Cu was in line with the Langmuir adsorption isotherm, while that for Cr fitted well
with the Freundlich model. The adsorption process was spontaneous exothermic process. When the
adsorption temperature increased, the adsorption equilibrium time shortened, and the adsorption capacity

收稿日期：2019-10-09; 定用日期：2019-12-18; DOI: 10.13550/j.jxhg.20190948
基金项目：中国石油大学胜利学院科技计划项目（KY2017029）
作者简介：王向鹏（1989—），男，讲师，E-mail：wangxiangpeng1989@163.com。联系人：张春晓（1974—），男，教授，E-mail：
000249@slcupc.edu.cn。