Page 168 - 《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
铝污泥基复合凝胶球对 Cr(Ⅵ)的吸附性能与机理

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雷增江 1,2 ，杨 斌 ，杨金辉 1,2* ，谢水波 1,2 ，王劲松 ，李 聪
（1. 南华大学 污染控制与资源化技术湖南省高校重点实验室，湖南 衡阳 421001；2. 南华大学 土木工
程学院，湖南 衡阳 421001）

摘要：以铝污泥、聚乙烯醇、海藻酸钠为原料，采用溶胶-凝胶、冷冻干燥技术制备铝污泥基复合凝胶球（AS-GEL），
用于吸附溶液中 Cr(Ⅵ)。通过静态吸附实验探究 pH、AS-GEL 投加量、初始质量浓度、温度、吸附时间、共存
阴离子浓度对 AS-GEL 吸附 Cr(Ⅵ)的影响。采用 SEM、FTIR、XPS 对 AS-GEL 吸附 Cr(Ⅵ)的机理进行分析。结
果表明，在 pH=4、AS-GEL 投加量为 1.2 g/L、Cr(Ⅵ)初始质量浓度 200 mg/L、温度为 35 ℃、吸附时间为 120 min、
3–
无其他阴离子共存的条件下，AS-GEL 对 Cr(Ⅵ)的最大吸附量为 73.364 mg/g。共存阴离子影响顺序为 PO 4 >
–
–
NO 3 >Cl 。吸附过程符合 Langmuir 等温吸附模型和准一级、准二级动力学方程。其主要吸附机理包括质子化基
团对 Cr(Ⅵ)的静电吸附及还原作用。5 次吸附-解吸实验后，其吸附量保持初次吸附量的 89.71%。同时，AS-GEL
具有成本低、固液易分离的特性，有望应用在工程上。
关键词：铝污泥；凝胶球；吸附；Cr(Ⅵ)；回收；解吸；水处理技术
中图分类号：X703 文献标识码：A 文章编号：1003-5214 (2021) 07-1450-09

Adsorption performance and mechanism of Cr(Ⅵ)

by aluminum sludge composite gel spheres

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LEI Zengjiang , YANG Bin , YANG Jinhui 1,2* , XIE Shuibo , WANG Jinsong , LI Cong
（1. Hunan Province Key Laboratory of Pollution Control and Resource Reuse Technology, University of South China,
Hengyang 421001, Hunan, China; 2. College of Civil Engineering, University of South China, Hengyang 421001,
Hunan, China）
Abstract: Aluminum sludge composite gel spheres (AS-GEL) for the adsorption of Cr(Ⅵ) in the solution
was prepared by sol-gel, freeze-drying technology using aluminum sludge, polyvinyl alcohol and sodium
alginate as raw materials. The effects of solution pH, dosage of AS-GEL, initial mass concentration of
Cr(Ⅵ) solution, temperature, adsorption time, and coexisting anion concentration on the adsorption of
Cr(Ⅵ) were explored by static adsorption experiments. The mechanism was analyzed by SEM, FTIR and
XPS. The results showed that under the conditions of pH=4, AS-GEL dosage of 1.2 g/L, Cr(Ⅵ) initial mass
concentration of 200 mg/L, temperature of 35 ℃, adsorption time of 120 min and no coexistence of other
anions, the maximum adsorption capacity of Cr(Ⅵ) by AS-GEL was 73.364 mg/g. The effect order of co-
3–
–
–
existing anions was PO 4 >NO 3 >Cl . The adsorption of Cr(Ⅵ) by AS-GEL conformed to Langmuir isotherm
adsorption models, pseudo-first-order and pseudo-second-order kinetic equations. The main adsorption
mechanism included the electrostatic adsorption and reduction of Cr(Ⅵ) by the protonated group. The
adsorption capacity remained 89.71% of the initial adsorption capacity after 5 adsorption-desorption
experiments. AS-GEL has the characteristics of low cost and easy solid-liquid separation, which has the
prospect of engineering application.
Key words: aluminum sludge; gel spheres; adsorption; Cr(Ⅵ); recovery; desorption; water treatment
technology

收稿日期：2020-09-18; 定用日期：2020-11-20; DOI: 10.13550/j.jxhg.20200875
基金项目：国家自然科学基金项目（21177053）；湖南省研究生科研创新项目资助（CX20200940）
作者简介：雷增江（1995—），男，硕士生，E-mail：530566791@qq.com。联系人：杨金辉（1964—），女，教授，E-mail：842893915@
qq.com。