Page 177 - 《精细化工》2021年第7期

第 38 卷第 7 期 精 细 化 工 Vol.38, No.7
202 1 年 7 月 FINE CHEMICALS July 2021

水处理技术与环境保护
聚乙烯醇/海藻酸钠双交联凝胶球的制备及其应用

黄良仙 1,2 ，韩星星 1,2* ，牛育华 1,2 ，宋 洁 1,2 ，王 荣 1,2

（1. 陕西科技大学 化学与化工学院，陕西 西安 710021；2. 陕西科技大学 教育部轻化工助剂重点实验
室，陕西 西安 710021）

摘要：将聚乙烯醇（PVA）、硼酸、海藻酸钠（SA）和氯化钙结合构筑双交联凝胶网络，并负载腐植酸钾（KHA）
和钙基蒙脱土（MMT）纳米粒子，成功制备了一种双交联凝胶球（PVA/SA/KHA/MMT）。该凝胶球用于亚甲基
蓝（MB）和 Pb(Ⅱ)的去除。通过 FTIR、XRD、TGA、SEM-EDS、Zeta 电位分析和 BET 表征了凝胶球的理化
性质。结果表明，吸附过程遵循准二级动力学模型，实验数据与 Langmuir 模型吻合良好。在 25 ℃时，MB 和
Pb(Ⅱ)的理论最大吸附容量分别为 793.65 和 507.61 mg/g。热力学结果表明，该凝胶球的吸附是自发吸热的，并
且是由系统总体熵的增加所驱动。FTIR 和 XPS 结果表明，Pb(Ⅱ)的吸附过程主要是通过羧基的螯合实现，而
MB 的吸附则通过氢键和静电相互作用发生。PVA/SA/KHA/MMT 对 MB 和 Pb(Ⅱ)具有较高的吸附选择性。经过
5 次循环使用后，凝胶球对 MB 和 Pb(Ⅱ)仍表现出较高的去除率。
关键词：凝胶球；吸附；MB；Pb(Ⅱ)；吸附机理；水处理技术
中图分类号：TQ424；X592；TQ427.2 文献标识码：A 文章编号：1003-5214 (2021) 07-1459-14

Preparation and application of polyvinyl alcohol/sodium
alginate double cross-linked gel beads

1,2
1,2
1,2
1,2
HUANG Liangxian , HAN Xingxing 1,2* , NIU Yuhua , SONG Jie , WANG Rong
（1. College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi'an 710021,
Shaanxi, China; 2. Key Laboratory of Auxiliary Chemistry and Technology for Light Chemicals, Ministry of Education,
Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China）
Abstract: Polyvinyl alcohol (PVA), boric acid, sodium alginate (SA) and calcium chloride were combined
to form a double-crosslinked gel network. Subsequently, potassium humate (KHA) and calcium-based
montmorillonite (MMT) nanoparticles were loaded on the double-crosslinked gel network to obtain a
double cross-linked gel beads (PVA/SA/KHA/MMT). The gel beads were used to remove methylene blue
(MB) and Pb(Ⅱ). The physical and chemical properties of gel beads were characterized by FTIR, XRD,
TGA, SEM-EDS, Zeta potential and BET. The results showed that the adsorption process followed the
pseudo-second-order kinetic model, and the experimental data was in good agreement with the Langmuir
model. At 25 ℃ , the theory maximum adsorption capacity values of MB and Pb(Ⅱ) were 793.65 and
507.61 mg/g, respectively. The thermodynamic results indicated that the adsorption of the gel beads was
spontaneous, endothermic, and driven by the increase of the total entropy of the system. FTIR and XPS
results demonstrated that the adsorption of Pb(Ⅱ) was mainly accomplished by chelation of carboxyl, while
that of MB occurred through hydrogen bonding and electrostatic interaction. PVA/SA/KHA/MMT gel
beads displayed excellent adsorption selectivity for MB and Pb(Ⅱ). Notably, the gel beads still had a higher
removal efficiency for MB and Pb(Ⅱ) after 5 cycles.
Key words: gel beads; adsorption; methylene blue; Pb(Ⅱ); adsorption mechanism; water treatment
technology

收稿日期：2020-12-21; 定用日期：2021-02-24; DOI: 10.13550/j.jxhg.20201201
基金项目：国家自然科学基金（51803114）；陕西省科技厅农业领域项目（S2020-YF-YBNY-0235）；西安市“科技+”行动计划-社会
发展科技创新示范项目（20SFSF0016）；榆林市科技计划项目（2019-166）
作者简介：黄良仙（1963—），女，教授，E-mail：huanglx@sust.edu.cn。联系人：韩星星（1994—），男，硕士生，E-mail：hanxingxing3922@163.com。