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阳离子凝胶吸附和回收水中的Cr(Ⅵ)

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方润, 林江飞, 郑强辉, 叶远松, 薛涵与. 阳离子凝胶吸附和回收水中的Cr(Ⅵ)[J]. 环境化学, 2020, (3): 704-714. doi: 10.7524/j.issn.0254-6108.2019101103
引用本文: 方润, 林江飞, 郑强辉, 叶远松, 薛涵与. 阳离子凝胶吸附和回收水中的Cr(Ⅵ)[J]. 环境化学, 2020, (3): 704-714. doi: 10.7524/j.issn.0254-6108.2019101103
shu
FANG Run, LIN Jiangfei, ZHENG Qianghui, YE Yuansong, XUE Hanyu. Adsorption and recovery of Cr(Ⅵ) from aqueous solution by cationic hydrogel[J]. Environmental Chemistry, 2020, (3): 704-714. doi: 10.7524/j.issn.0254-6108.2019101103
Citation: FANG Run, LIN Jiangfei, ZHENG Qianghui, YE Yuansong, XUE Hanyu. Adsorption and recovery of Cr(Ⅵ) from aqueous solution by cationic hydrogel[J]. Environmental Chemistry, 2020, (3): 704-714. doi: 10.7524/j.issn.0254-6108.2019101103
shu

阳离子凝胶吸附和回收水中的Cr(Ⅵ)

  • 1. 闽江学院化工与材料系, 绿色材料与化工福建省高校工程研究中心, 福州, 350108;

  • 2. 福建省中国漆新型材料工程研究中心, 福州, 350108

    • 通讯作者: 方润, E-mail: readfung@163.com ; 
  • 基金项目:

    国家自然科学基金（51703090），福建省自然科学基金（2019J01759），福建省属高校科研专项（JK2017037）和闽江学院校长基金（103952018209）资助.

Adsorption and recovery of Cr(Ⅵ) from aqueous solution by cationic hydrogel

  • 1. Department of Chemical Engineering and Materials, Minjiang University, Fujian Provincial University Engineering Research Center of Green Materials and Chemical Engineering, Fuzhou, 350108, China;

  • 2. Fujian Engineering Research Center of New Chinese Lacquer Material, Fuzhou, 350108, China

    • Corresponding author: FANG Run, readfung@163.com ; 
  • Fund Project: Supported by the National Natural Science Foundation of China (51703090), Natural Science Foundation of Fujian Province (2019J01759), Scientific Research Foundation of Fujian Higher Education(JK2017037)and President Foundation of Minjiang University (103952018209).

  • 摘要: 以三乙烯四胺、二甲胺和甲醛为单体、戊二醛为交联剂，以溶液缩聚-交联法制备了一种高等电点、高阳离子度的阳离子凝胶吸附剂.通过核磁共振碳谱、表面zeta电位和扫描电镜分析探讨了阳离子凝胶吸附水中Cr（Ⅵ）的机理和行为特点，通过静态和动态吸附实验评估了凝胶的吸附能力和再生效果，最后探索了铬的回收.研究表明，阳离子凝胶的等电点为10.2，pH=3时阳离子度达3.9 mmol·g-1，其对水中Cr（Ⅵ）的大容量吸附主要基于凝胶网络上数量众多的质子化胺基与Cr（Ⅵ）间的静电作用.阳离子凝胶对水中Cr（Ⅵ）的吸附能力远高于Cu2+、Ni2+、Zn2+等金属离子且不受SO42-、NO3-、Cl-等阴离子影响.吸附过程中，Cr（Ⅵ）扩散进入凝胶内部与阳离子吸附位点相结合并最终达到动态吸附-脱附平衡.在动态吸附实验中阳离子凝胶同样具有良好的吸附能力，尽管再生后凝胶对Cr（Ⅵ）的吸附容量有所降低，但采用灼烧灰化的方法则可完全回收凝胶所吸附的Cr（Ⅵ）.
    Abstract: With triethylenetetramine, acetone and formaldehyde as monomers and glutaraldehyde as crosslinking agent, a cationic hydrogel adsorbent with high isoelectric point and high cationicity was prepared by solution polycondensation-crosslinking method. The Cr(Ⅵ) adsorption mechanism and the characteristics of cationic hydrogel were investigated through solid-state NMR spectrum, zeta potential test and scanning electron microscopy (SEM) analysis. Batch and continuous adsorption experiments were performed to evaluate the adsorption capacity of original and regenerated hydrogels. Finally, the recovery of chromium was explored. Results indicated that the isoelectric point of the cationic hydrogel was 10.2 and the cationicity was 3.9 mmol·g-1 at pH=3. Its high adsorption capacity was mainly due to the electrostatic interaction between Cr(Ⅵ) and a large number of protonated amines on the hydrogel network. The adsorption capacity of cationic hydrogel for Cr(Ⅵ) in a multiple ion solution was much higher than that of Cu2+, Ni2+, Zn2+ and was not affected by anions like SO42-, NO3- and Cl-. During the adsorption, Cr(Ⅵ) diffused into the hydrogel and bound with cationic adsorption sites, and finally achieved dynamic adsorption-desorption equilibrium. Good adsorption performance could also be observed in the continuous adsorption experiments. Although the adsorption capacity of cationic hydrogel for Cr(Ⅵ) decreased after regeneration, the adsorbed Cr(Ⅵ) could be completely recovered by ashing the hydrogel.
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  • 收稿日期:  2019-10-11

阳离子凝胶吸附和回收水中的Cr(Ⅵ)

    通讯作者: 方润, E-mail: readfung@163.com ; 
  • 1. 闽江学院化工与材料系, 绿色材料与化工福建省高校工程研究中心, 福州, 350108;
  • 2. 福建省中国漆新型材料工程研究中心, 福州, 350108
  • 收稿日期:  2019-10-11
基金项目:

国家自然科学基金（51703090），福建省自然科学基金（2019J01759），福建省属高校科研专项（JK2017037）和闽江学院校长基金（103952018209）资助.

摘要: 以三乙烯四胺、二甲胺和甲醛为单体、戊二醛为交联剂，以溶液缩聚-交联法制备了一种高等电点、高阳离子度的阳离子凝胶吸附剂.通过核磁共振碳谱、表面zeta电位和扫描电镜分析探讨了阳离子凝胶吸附水中Cr（Ⅵ）的机理和行为特点，通过静态和动态吸附实验评估了凝胶的吸附能力和再生效果，最后探索了铬的回收.研究表明，阳离子凝胶的等电点为10.2，pH=3时阳离子度达3.9 mmol·g-1，其对水中Cr（Ⅵ）的大容量吸附主要基于凝胶网络上数量众多的质子化胺基与Cr（Ⅵ）间的静电作用.阳离子凝胶对水中Cr（Ⅵ）的吸附能力远高于Cu2+、Ni2+、Zn2+等金属离子且不受SO42-、NO3-、Cl-等阴离子影响.吸附过程中，Cr（Ⅵ）扩散进入凝胶内部与阳离子吸附位点相结合并最终达到动态吸附-脱附平衡.在动态吸附实验中阳离子凝胶同样具有良好的吸附能力，尽管再生后凝胶对Cr（Ⅵ）的吸附容量有所降低，但采用灼烧灰化的方法则可完全回收凝胶所吸附的Cr（Ⅵ）.

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