A zwitterion metal-organic framework for the removal of fluoride from an aqueous solution

IF 1.7 4区化学 Q3 Chemistry Journal of Chemical Sciences Pub Date : 2022-07-11 DOI:10.1007/s12039-022-02069-7

M ALIAKBARI, R M GHOLAMI, S M BORGHEI

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引用次数: 2

Abstract

Excess fluoride is one of the water pollutants in the world, which is removed from water by chemical methods to produce sludge. On the other hand, techniques such as R.O. (Reverse Osmosis) also have problems with power consumption and wastewater disposal. Metal-organic frameworks are one of the newest adsorbents used to separate anions. In this study, MOF1 ({[Zn₃L₃(BPE)_1.5]·4.5DMF}_n) was used to remove fluoride from the aqueous solution. The influence of various factors such as pH, contact time, adsorbent amount, and temperature on fluoride uptake was investigated. Based on the results, the MOF synthesized in acidic media absorbs more fluoride ions. The reaction time in the first 20 min had a significant effect on fluoride removal, but its impact was significantly reduced in longer times. Increasing the adsorbent mass to reach saturation was adequate, but the ambient temperature of the water had no significant impact on the adsorption of fluoride ions. The results of kinetic studies confirm the pseudo-second-order kinetics of fluoride adsorption reactions in the presence of MOF1. Also, in this research, the central zinc metal has been used as a zwitterion to reduce the environmental effects of MOF.

Graphical abstract

Positive nitrogens on the surface of MOF1 pores are suitable sites for the adsorption of fluoride ions through electrostatic interactions, leading to the efficient removal of fluoride from the aqueous solution by this zwitterion metal-organic framework.

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一种两性离子金属有机骨架，用于从水溶液中去除氟化物

过量的氟化物是世界上的水污染物之一，通过化学方法将其从水中去除产生污泥。另一方面，诸如R.O.(反渗透)之类的技术也存在功耗和废水处理方面的问题。金属有机骨架是一种新型的用于分离阴离子的吸附剂。本研究采用MOF1 ({[Zn3L3(BPE)1.5]·4.5DMF}n)去除水溶液中的氟化物。考察了pH、接触时间、吸附剂用量、温度等因素对氟吸收率的影响。结果表明，在酸性介质中合成的MOF能吸收更多的氟离子。前20分钟的反应时间对除氟有显著影响，但在较长的时间内其影响显著降低。增加吸附剂质量达到饱和就足够了，但水的环境温度对氟离子的吸附没有显著影响。动力学研究结果证实了MOF1存在下氟吸附反应的准二级动力学。此外，在本研究中，中心金属锌被用作两性离子，以减少MOF的环境影响。MOF1孔表面的正氮是通过静电相互作用吸附氟离子的合适位置，导致这种两性离子金属-有机框架有效地去除水溶液中的氟。

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来源期刊

Journal of Chemical Sciences Chemistry-General Chemistry

CiteScore

2.90

自引率

5.90%

发文量

107

审稿时长

12 months

期刊介绍： Journal of Chemical Sciences is a monthly journal published by the Indian Academy of Sciences. It formed part of the original Proceedings of the Indian Academy of Sciences – Part A, started by the Nobel Laureate Prof C V Raman in 1934, that was split in 1978 into three separate journals. It was renamed as Journal of Chemical Sciences in 2004. The journal publishes original research articles and rapid communications, covering all areas of chemical sciences. A significant feature of the journal is its special issues, brought out from time to time, devoted to conference symposia/proceedings in frontier areas of the subject, held not only in India but also in other countries.