球形木质纤维素基阴离子交换剂吸附去除水中Cr（Ⅵ）的性能

陈思豪; 曹威; 钱政文; 李飞; 周真明

文章摘要

陈思豪,曹威,钱政文,李飞,周真明.球形木质纤维素基阴离子交换剂吸附去除水中Cr（Ⅵ）的性能[J].农业环境科学学报,2025,44(5):1378-1386.

球形木质纤维素基阴离子交换剂吸附去除水中Cr（Ⅵ）的性能

Adsorption and removal of Cr（Ⅵ）from water by spherical lignocellulose-based anion exchanger

投稿时间：2024-06-06

DOI：10.11654/jaes.2024-0479

中文关键词: 甘蔗渣球形木质纤维素基阴离子交换剂 Cr（Ⅵ）吸附去除还原转化

英文关键词: sugarcane bagasse spherical lignocellulosic anion exchanger Cr（Ⅵ） adsorption removal reduction conversion

基金项目:福建省自然科学基金项目（2021J01283）

作者	单位	E-mail
陈思豪	华侨大学土木工程学院, 福建厦门 361021
曹威	华侨大学土木工程学院, 福建厦门 361021	weicao@hqu.edu.cn
钱政文	华侨大学土木工程学院, 福建厦门 361021
李飞	华侨大学土木工程学院, 福建厦门 361021
周真明	华侨大学土木工程学院, 福建厦门 361021

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中文摘要:

本研究利用甘蔗渣通过离子液体1-烯丙基-3-甲基咪唑氯（[Amim]Cl）处理，成功制备了球形木质纤维素颗粒（LCB）。进而，在吡啶反应体系中，对LCB进行了季铵化改性，得到了球形木质纤维素基阴离子交换剂（LCB-AE），利用制备的LCB-AE吸附去除水中Cr（Ⅵ），并探讨其吸附性能和去除机理。结果表明：pH对LCB-AE吸附水中Cr（Ⅵ）的影响最大，在酸性条件下吸附效果最佳；吸附等温线符合Langmuir模型，在常温、中性条件下吸附量约为40 mg·g^-1；吸附过程符合准二级吸附动力学模型，LCB-AE对Cr（Ⅵ）的吸附为吸热反应，即温度升高促进吸附；通过XPS对材料进行表征，发现去除机理主要为离子交换，同时存在部分Cr（Ⅵ）还原转化；共存阴离子（PO₃^4-、NO₃^-和SO₂^4-）竞争吸附、吸附-再生及柱实验表明LCB-AE有较好的选择吸附性能，并能在多次循环中保持稳定，且能够快速吸附水体中的Cr（Ⅵ）。研究表明，木制纤维素通过季铵化改性之后，对Cr（Ⅵ）具有良好的吸附效果。

英文摘要:

In the present study, spherical lignocellulose particles（LCB）were successfully prepared using sugarcane bagasse by treatment with ionic liquid 1-allyl-3-methylimidazolium chloride（[Amim]Cl）. Further, LCB was quaternized and modified in a pyridine reaction system to obtain a spherical lignocellulose-based anion exchanger（LCB -AE）, and the prepared LCB-AE was utilized to adsorb the removal of Cr（Ⅵ）from water and to explore its adsorption performance and removal mechanism. The results showed that：pH had the greatest effect on the adsorption of Cr（Ⅵ）from water by LCB-AE, and the adsorption effect was the best under acidic conditions; the adsorption isotherm conformed to the Langmuir model, with the adsorption amount of about 40 mg · g^-1 at room temperature and neutral conditions; the adsorption process conformed to the quasi-secondary adsorption kinetic model, and the adsorption of Cr（Ⅵ）by LCB-AE was a thermoabsorptive reaction, i. e., the increase of the temperature promoted the adsorption. Characterization of the material by XPS revealed that the removal mechanism was mainly ion exchange, with partial reduction transformation of Cr（Ⅵ）; competitive adsorption of coexisting anions（PO₃^4-, NO₃^-, SO₂^4-）, adsorption-regeneration and column experiments showed that LCB-AE had good selective adsorption performance and could remain stable in several cycles, which could rapidly adsorb Cr（Ⅵ）in water bodies. The study showed that lignocellulose has good adsorption effect on Cr（Ⅵ）after modified by quaternization.

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