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| Adsorption and removal of Cr（Ⅵ）from water by spherical lignocellulose-based anion exchanger |
| Received:June 06, 2024 |
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| KeyWord:sugarcane bagasse;spherical lignocellulosic anion exchanger;Cr（Ⅵ）;adsorption removal;reduction conversion |
| Author Name | Affiliation | E-mail | | CHEN Sihao | College of Civil Engineering, Huaqiao University, Xiamen 361021, China | | | CAO Wei | College of Civil Engineering, Huaqiao University, Xiamen 361021, China | weicao@hqu.edu.cn | | QIAN Zhengwen | College of Civil Engineering, Huaqiao University, Xiamen 361021, China | | | LI Fei | College of Civil Engineering, Huaqiao University, Xiamen 361021, China | | | ZHOU Zhenming | College of Civil Engineering, Huaqiao University, Xiamen 361021, China | |
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| Abstract: |
| 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（PO34-, NO3-, SO24-）, 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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