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制备易于分离和重复使用的 MIL-125(Ti)/MIL-53(Fe) 二元 MOF/CNT/海藻酸钠复合微球，用于从水体中去除四环素。

Fabrication of easy separable and reusable MIL-125(Ti)/MIL-53(Fe) binary MOF/CNT/Alginate composite microbeads for tetracycline removal from water bodies.

机构信息

Polymer Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), P. O. Box: 21934, New Borg El-Arab City, Alexandria, Egypt.

Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt.

出版信息

Sci Rep. 2021 Dec 10;11(1):23818. doi: 10.1038/s41598-021-03428-z.

DOI:10.1038/s41598-021-03428-z
PMID:34893701
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8664953/
Abstract

In this investigation, we aimed to fabricate easy separable composite microbeads for efficient adsorption of tetracycline (TC) drug. MIL-125(Ti)/MIL-53(Fe) binary metal organic framework (MOF) was synthetized and incorporated with carbon nanotube (CNT) into alginate (Alg) microbeads to form MIL-125(Ti)/MIL-53(Fe)/CNT@Alg composite microbeads. Various tools including FTIR, XRD, SEM, BET, Zeta potential and XPS were applied to characterize the composite microbeads. It was found that the specific surface area of MIL-125(Ti)/MIL-53(Fe)/CNT@Alg microbeads was 273.77 m/g. The results revealed that the adsorption of TC augmented with rising CNT proportion up to 15 wt% in the microbeads matrix. In addition, the adsorption process followed the pseudo-second-order and well-fitted to Freundlich and Langmuir models with a maximum adsorption capacity of 294.12 mg/g at 25 ◦C and pH 6. Furthermore, thermodynamic study clarified that the TC adsorption process was endothermic, random and spontaneous. Besides, reusability test signified that MIL-125(Ti)/MIL-53(Fe)/CNT@Alg composite microbeads retained superb adsorption properties for six consecutive cycles, emphasizing its potentiality for removing of pharmaceutical residues.

摘要

在这项研究中，我们旨在制备易于分离的复合微球，以有效吸附四环素（TC）药物。合成了 MIL-125(Ti)/MIL-53(Fe)二元金属有机骨架（MOF），并将其与碳纳米管（CNT）一起掺入海藻酸钠（Alg）微球中，形成 MIL-125(Ti)/MIL-53(Fe)/CNT@Alg 复合微球。采用傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、扫描电子显微镜（SEM）、比表面积和孔隙度分析仪（BET）、Zeta 电位和 X 射线光电子能谱（XPS）等多种工具对复合微球进行了表征。结果表明，MIL-125(Ti)/MIL-53(Fe)/CNT@Alg 微球的比表面积为 273.77 m2/g。结果表明，随着微球基质中 CNT 比例的增加，TC 的吸附量增加，当 CNT 比例达到 15wt%时，吸附量达到最大值。此外，吸附过程符合准二级动力学模型，并且很好地符合 Freundlich 和 Langmuir 模型，在 25°C 和 pH 6 下的最大吸附容量为 294.12 mg/g。此外，热力学研究表明，TC 的吸附过程是吸热的、随机的和自发的。此外，重复使用测试表明，MIL-125(Ti)/MIL-53(Fe)/CNT@Alg 复合微球在六个连续循环中保留了优异的吸附性能，强调了其去除药物残留的潜力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19c2/8664953/caa77fde46ed/41598_2021_3428_Fig9_HTML.jpg
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