室温制备铁基有机金属框架吸附三价砷的研究
收稿日期: 2023-04-17
网络出版日期: 2024-02-06
基金资助
国家重点研发计划项目(2022YFC2904703);四川省重点研发项目(21ZDYF4086)
Research on preparation of iron-based organic metal-organic framework at room temperature for adsorption of trivalent arsenic
Received date: 2023-04-17
Online published: 2024-02-06
地下水中的砷污染日益严重，摄入高砷地下水会严重危害人体健康。因此，高效去除水中的砷具有重要意义。在室温下合成了铁基金属有机框架MIL-88A用于吸附水中的As（Ⅲ）。通过XRD、SEM、XPS和FT-IR等手段对MIL-88A进行了表征，研究了MIL-88A吸附As（Ⅲ）过程的动力学、热力学参数。结果表明：MIL-88A能够实现对水中As（Ⅲ）的高效吸附，最大吸附量为286.37 mg/g，高于现有同类型吸附剂；MIL-88A吸附As（Ⅲ）过程的动力学和等温线数据分别符合准二级动力学模型和Freundlich模型，说明MIL-88A对As（Ⅲ）的吸附是化学吸附与多层吸附相结合的过程。结合表征分析可以得出，MIL-88A表面的羧基可以吸附As（Ⅲ）并将其氧化成As（Ⅴ），As（Ⅴ）通过氢键继续吸附As（Ⅲ）形成多层吸附。该研究为高效脱除水中As（Ⅲ）提供了理论参考。
贺翌鹏 , 熊晨曦 , 王一平 , 李军 , 金央 . 室温制备铁基有机金属框架吸附三价砷的研究[J]. 无机盐工业, 2024 , 56(2) : 111 -120 . DOI: 10.19964/j.issn.1006-4990.2023-0221
Arsenic pollution of groundwater is becoming increasingly serious，and drinking high-arsenic groundwater will seriously endanger human health.Therefore，it is of great significance to efficiently remove arsenic from water.The iron-based metal-organic framework MIL-88A was synthesized at room temperature for adsorbing As（Ⅲ） from water.MIL-88A was characterized by XRD，SEM，XPS and FT-IR.The kinetics and thermodynamics parameters of MIL-88A adsorbing As（Ⅲ） were studied.The experimental results showed that MIL-88A could efficiently adsorb As（Ⅲ） from water with the maximum adsorption capacity up to 286.37 mg/g，which was higher than that of similar adsorbents.The adsorption kinetic and isotherm data of MIL-88A were corresponded to pseudo-second-order kinetics model and Freundlich model，respectively，indicating that the adsorption process of MIL-88A to As（Ⅲ） was a combination of chemical adsorption and multi-layer adsorption.Combining with the characterization analysis，it was concluded that the carboxyl groups on the surface of MIL-88A could oxidatively adsorb As（Ⅲ） and oxidated to generate As（V），and As（V） adsorbed on the surface of the material could further adsorb As（Ⅲ） through hydrogen bonds，forming a multi-layer adsorption.This paper provided a theoretical reference for the efficient removal of As（Ⅲ） from water.
Key words： arsenic removal; aqueous solution; MOFs; MIL-88A
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