Page 90 - 《精细化工》2022年第7期

第 39 卷第 7 期 精 细 化 工 Vol.39, No.7
2022 年 7 月 FINE CHEMICALS July 2022

功能材料
膨润土/羧甲基纤维素钠水凝胶的

制备及其应用

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卢健康 ，汪争先 ，吴称意 1,2* ，韩昆仑 ，李婷婷 ，王鹏婷
〔1. 超轻弹性材料国家民委重点实验室（湖北民族大学），湖北 恩施 445000；2. 湖北民族大学 化学与
环境工程学院，湖北 恩施 445000〕
摘要：以 HNO 3 处理后的 BT（NBT）、羧甲基纤维素钠（CMC）为原料，通过简单的化学交联制备了 BT-g-CMC
水凝胶，采用 FTIR、XRD、TG、N 2 吸附-脱附及 SEM 对其进行了表征。随后，将其用于废水中磷的回收，考
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察其对 H 2 PO 4 的吸附性能、吸附动力学、吸附等温线及吸附机理。最后，将富含磷的 BT-g-CMC1.0 水凝胶
（NBT/CMC 质量比为 1.00∶1）用作缓释肥料（SRFs），对其保水、缓释行为及盆栽实验进行了评价。结果
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表明，BT-g-CMC1.0 水凝胶在 298 K 下对 H 2 PO 4 具有良好的亲和力，吸附量为 18.78 mg/g，吸附平衡时间为
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120 min。拟二级动力学模型和 Freundlich 等温线模型可以更好地描述 H 2 PO 4 的吸附过程，化学吸附在吸附过
程中起主导作用。SRFs 具有优良的保水和缓释能力，对蔬菜生长具有促进作用。SRFs（用量为 0.30 g）浸出 3
次时，对土壤中 Cr(Ⅲ)的固定化率为 82.9%。
关键词：羧甲基纤维素钠；膨润土；水凝胶；吸附；缓释肥料；功能材料
中图分类号：TQ424；TQ427.2 文献标识码：A
文章编号：1003-5214 (2022) 07-1376-10 开放科学 (资源服务) 标识码 (OSID)：

Preparation and application of bentonite/sodium carboxymethyl

cellulose hydrogel

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LU Jiankang , WANG Zhengxian , WU Chengyi 1,2* , HAN Kunlun ,
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LI Tingting , WANG Pengting
[1. Key Laboratory of Green Manufacturing of Super-light Elastomer Materials of State Ethnic Affairs Commission (Hubei
Minzu University), Enshi 445000, Hubei, China; 2. Department of Chemistry and Environmental Engineering, Hubei Minzu
University, Enshi 445000, Hubei, China]
Abstract: BT-g-CMC hydrogels were prepared by simple chemical cross-linking between HNO 3 treated
BT (NBT) and sodium carboxymethyl cellulose (CMC), which were then characterized by FTIR, XRD, TG,
N 2 adsorption-desorption and SEM. Next, the hydrogels were used to recover phosphorus from wastewater,
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upon which their adsorption performance such as kinetics, isotherms and mechanism of H 2PO 4 were
investigated. Finally, BT-g-CMC1.0 hydrogel with a NBT/CMC mass ratio of 1.00∶1 rich in phosphorus
was experimented as slow-release fertilizer (SRFs), and evaluations were conducted on its water retention
ability, controlled-release behavior and fertilizing effects on pot plants. The results showed that the
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BT-g-CMC1.0 hydrogel had a good affinity for H 2PO 4 at 298 K with an adsorption capacity of 18.78 mg/g,
and equilibrium time of 120 min. It was also found that chemisorption played a leading role in the adsorption
process that was better described by pseudo-second-order kinetic model and Freundlich isotherm model.
Moreover, SRFs exhibited excellent performance in water retention, slow-release and plant growth
promotion. When the amount of SRFs was 0.30 g and leaching for three times, the immobilization rate of
Cr(Ⅲ) in soil was 82.9%.

收稿日期：2021-12-20; 定用日期：2022-03-08; DOI: 10.13550/j.jxhg.20211301
基金项目：湖北省青年自然科学基金面上项目（2014CFB618）；湖北民族大学高水平科研成果培育项目（PY20010）；生物资源保护
与利用湖北省重点实验室开放项目（PT012014）；超轻弹性材料国家民委重点实验室开放项目（PT092012）
作者简介：卢健康（1994—），男，硕士生，E-mail：ljk15225799530@163.com。联系人：吴称意（1982—），男，副教授，E-mail：
wcygfz@126.com。