| 巯基改性壳聚糖复合材料的制备及其用于高容量去除水中Hg(Ⅱ) |
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| 引用本文： | 熊茹婷, 张志恒, 林海英, 黄美惠, 华玉芬, 普瑞琪, 谢天添. 巯基改性壳聚糖复合材料的制备及其用于高容量去除水中Hg(Ⅱ)[J]. 环境工程学报, 2023, 17(3): 761-773. doi: 10.12030/j.cjee.202210018 |
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| 作者姓名： | 熊茹婷 张志恒 林海英 黄美惠 华玉芬 普瑞琪 谢天添 |
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| 作者单位： | 1.广西大学资源环境与材料学院，南宁 530004; 2.广西高校环境保护重点实验室，南宁 530004 |
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| 基金项目： | 国家自然科学基金地区项目(22166006)；;广西自然科学基金面上项目(2020GXNSFAA297011)； |
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| 摘 要： | 摘 要 壳聚糖(CS)因其无毒害、可降解性、成本低等特点而在众多高分子材料中脱颖而出，但稳定性和选择性较差，从而限制了其在重金属吸附中的应用。以巯基丙酸 (MPA) 为改性剂，以1-乙基-(3-二甲基氨基丙基)碳酰二亚胺(EDC) 为活化剂，制备了CS-MPA复合材料，使用单一变量法优化制备条件。结果表明，最优制备参数为：改性时间6 h，温度20 ℃，pH=6，m(CS:MPA:EDC)为1∶0.8∶1，制备得到的 CS-MPA在酸性条件下对Hg(II)依旧保持较高去除效率。在复合材料表面引入巯基后出现了多层堆叠的不规则形态，比表面积增大。CS-MPA对Hg(II)的吸附在 360 min 内可达到平衡，以单层吸热的化学反应为主，25 ℃时理论最大吸附容量推测为 833.3 mg·g−1。吸附机理主要是材料上的软碱(—SH和—NH2)与软酸 Hg(II)之间发生的螯合反应，其次为酰胺基的结合作用。CS-MPA对 Hg(II)有较高的吸附选择性；且经过5次的吸附-解吸循环后，去除率仍保持在较高水平。以上研究结果表明 CS-MPA对Hg(II)的去除效果较好，可为废水中Hg(II)的去除与回收提供参考。
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| 关 键 词： | 改性壳聚糖 巯基丙酸 汞 吸附 |
| 收稿时间： | 2022-10-08 |
A facile synthesis of thiol-modified chitosan composite for high-capacity capture of mercury from aqueous solution |
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| XIONG Ruting, ZHANG Zhiheng, LIN Haiying, HUANG Meihui, HUA Yufen, PU Ruiqi, XIE Tiantian. A facile synthesis of thiol-modified chitosan composite for high-capacity capture of mercury from aqueous solution[J]. Chinese Journal of Environmental Engineering, 2023, 17(3): 761-773. doi: 10.12030/j.cjee.202210018 |
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| Authors: | XIONG Ruting ZHANG Zhiheng LIN Haiying HUANG Meihui HUA Yufen PU Ruiqi XIE Tiantian |
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| Affiliation: | 1.College of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; 2.Key Laboratory of Environmental Protection in Guangxi Universities, Nanning 530004, China |
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| Abstract: | Abstract Chitosan (CS) possesses prominent merits such as non-toxic, degradability, and low cost, which stands out from numerous materials, but its application in heavy metal adsorption was restricted by the poor stability and selectivity. In the study, a novel composite (thiol-modified chitosan, CS-MPA) was prepared with mercaptopropionic acid (MPA) as a modifier and 1-ethyl-(3-dimethylaminopropyl) carbodiimide (EDC) as an activator. The suitable preparation parameters were optimized by a single variable method. The results showed that the optimized preparation parameters were as follows: modifying time of 6h, 20 ℃, pH 6 and m(CS:MPA:EDC) of 1:0.8:1. The as-prepared material maintained high removal efficiency even at acidic pHs. After the grafting of sulfhydryl was introduced on the surface of the composite, the stacked irregular multilayer and the increased specific surface area occurred. The mercury adsorption onto the composite reached the equilibrium within 360 min, which was dominated by the endothermic monolayer chemical reaction; the theoretical maximum adsorption capacity was estimated as 833.3 mg·g−1 at 25 ℃. The adsorption mechanism was dominated by the chelation between the soft base groups(—SH and —NH2) and the soft acid of Hg(II), with an auxiliary function of acylamino binding. The CS-MPA possessed an outstanding selectivity to Hg(II) in the complex matrix. It maintained the good removal rates even after five adsorption-desorption cycles. The result proved the CS-MPA composite had a good Hg(II) removal performance and application potential, which can provide a reference for Hg(II) capture and recycling in the wastewater. |
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| Keywords: | modified chitosan material mercaptopropionic acid mercury adsorption |
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