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氨基功能化 MIL-68(Al) 金属有机骨架的简易制备及其对砷酸盐（As(V)）的有效吸附。

Facile fabrication of amino-functionalized MIL-68(Al) metal-organic framework for effective adsorption of arsenate (As(V)).

机构信息

Department of Environmental Health Engineering, Faculty of Health and Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran.

Department of Environmental Health Engineering, Hamadan University of Medical Sciences, Hamadan, Iran.

出版信息

Sci Rep. 2022 Jul 13;12(1):11865. doi: 10.1038/s41598-022-16038-0.

DOI:10.1038/s41598-022-16038-0
PMID:35831402
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9279506/
Abstract

An amino-functionalized MIL-68(Al) metal-organic framework (amino-MIL-68(Al) MOF) was synthesized by solvothermal method and then characterized by FESEM, XRD, FTIR, EDX-mapping, and BET-BJH techniques. In order to predict arsenate (As(V)) removal, a robust quadratic model (R > 0.99, F-value = 2389.17 and p value < 0.0001) was developed by the central composite design (CCD) method and then the genetic algorithm (GA) was utilized to optimize the system response and four independent variables. The results showed that As(V) adsorption on MOF was affected by solution pH, adsorbent dose, As(V) concentration and reaction time, respectively. Predicted and experimental As(V) removal efficiencies under optimal conditions were 99.45 and 99.87%, respectively. The fitting of experimental data showed that As(V) adsorption on MOF is well described by the nonlinear form of the Langmuir isotherm and pseudo-second-order kinetic. At optimum pH 3, the maximum As(V) adsorption capacity was 74.29 mg/g. Thermodynamic studies in the temperature range of 25 to 50 °C showed that As(V) adsorption is a spontaneous endothermic process. The reusability of MOF in ten adsorption/regeneration cycles was studied and the results showed high reusability of this adsorbent. The highest interventional effect in inhibiting As(V) adsorption was related to phosphate anion. The results of this study showed that amino-MIL-68(Al) can be used as an effective MOF with a high surface area (> 1000 m/g) and high reusability for As(V)-contaminated water.

摘要

一种氨基功能化的 MIL-68(Al) 金属有机骨架（氨基-MIL-68(Al) MOF）通过溶剂热法合成，然后通过 FESEM、XRD、FTIR、EDX 映射和 BET-BJH 技术进行表征。为了预测砷酸盐（As(V)）的去除，通过中心复合设计（CCD）方法建立了稳健的二次模型（R>0.99，F 值=2389.17，p 值<0.0001），然后利用遗传算法（GA）优化系统响应和四个独立变量。结果表明，MOF 上的 As(V)吸附受溶液 pH、吸附剂剂量、As(V)浓度和反应时间的影响。在最佳条件下，预测和实验的 As(V)去除效率分别为 99.45%和 99.87%。实验数据的拟合表明，MOF 上的 As(V)吸附很好地符合非线性形式的 Langmuir 等温线和伪二阶动力学。在最佳 pH 3 下，最大 As(V)吸附容量为 74.29mg/g。在 25 至 50°C 的温度范围内进行的热力学研究表明，As(V)吸附是一个自发的吸热过程。研究了 MOF 在十次吸附/再生循环中的可重复使用性，结果表明该吸附剂具有很高的可重复使用性。抑制 As(V)吸附的最高干预效应与磷酸根阴离子有关。本研究结果表明，氨基-MIL-68(Al) 可用作一种有效的 MOF，具有高比表面积（>1000 m/g）和高可重复使用性，可用于处理含 As(V)的水。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f0c3/9279506/cadea5745d12/41598_2022_16038_Fig9_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f0c3/9279506/33fd1fbc7875/41598_2022_16038_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f0c3/9279506/cadea5745d12/41598_2022_16038_Fig9_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f0c3/9279506/b525ecc1995c/41598_2022_16038_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f0c3/9279506/436e2ccc44a0/41598_2022_16038_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f0c3/9279506/9f53ed8c4032/41598_2022_16038_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f0c3/9279506/e262faa4f0fe/41598_2022_16038_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f0c3/9279506/33fd1fbc7875/41598_2022_16038_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f0c3/9279506/cadea5745d12/41598_2022_16038_Fig9_HTML.jpg

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