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Greener route for the removal of toxic heavy metals and synthesis of 14-aryl-14H dibenzo[a,j] xanthene using a novel and efficient Ag-Mg bimetallic MOF as a recyclable heterogeneous nanocatalyst
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.7 ) Pub Date : 2021-05-06 , DOI: 10.1016/j.jtice.2021.04.036
S.A. El-Hakam , Amr A. Ibrahim , L.A. Elatwy , W.S. Abo El-Yazeed , Reda. S. Salama , Y.G. Abou El-Reash , Awad I. Ahmed

Removing of heavy metal ions from aqueous solutions has become a serious challenge from both biological and environmental viewpoints. Recently, metal-organic frameworks (MOF) including two metal ions in its framework have been enhanced as promising structure in the capture of various hazardous and toxic substances. Herein, Ag-Mg-MOF were synthesized through a one-step approach using solvothermal technique. Then, the as-synthesized Bimetallic MOFs were characterized by TEM, SEM, EDS, XRD, FTIR and N2 adsorption. The as-synthesized Ag-Mg-MOF samples were used for heavy metal removal. The results showed that the adsorption of cadmium, lead and Cupper ions on MOF was improved by the pH increasing. The experimental data were examined through Freundlich and Langmuir models. The fabricated Ag-Mg MOFs exhibit enhanced decontaminant performance toward Cu2+, Cd2+and Pb2 ions in terms of high adsorption capacities, Pb2+ (350 mg/g)> Cd2+ (270 mg/g)> Cu2+ (202 mg/g), and ultrafast kinetics compared to the monometallic Mg-MOF. FT-IR spectra of adsorbed pyridine methods and non-aqueous potentiometric titration were used for measuring surface acidity of the prepared MOF. It was observed that the surface acidity and the catalytic activity were increased in bimetallic MOF compared to monometallic MOF. The catalytic results of the formation of free solvent 14-aryl-14-Hdibenzo[a,j]xanthene compound by Ag-Mg MOF showed a high yield at a lower time. Also, the prepared MOF catalysts still preserved their initial catalytic activity even after the 4th run. The results of this work demonstrate that the novel Ag-Mg MOFs nanocatalysts have great potential for applications in environmental protection, especially in heavy metal ions removal present in wastewaters and in the synthesis of pharmacologically and biologically active compound.



中文翻译:

使用新型高效 Ag-Mg 双金属 MOF 作为可回收的多相纳米催化剂去除有毒重金属和合成 14-芳基-14H 二苯并 [ a,j ] 呫吨的绿色途径

从生物和环境的角度来看,从水溶液中去除重金属离子已成为一项严峻的挑战。最近,在其骨架中包含两种金属离子的金属有机骨架 (MOF) 已被增强为捕获各种有害和有毒物质的有前途的结构。在此,Ag-Mg-MOF 是使用溶剂热技术通过一步法合成的。然后,合成的双金属 MOF 通过 TEM、SEM、EDS、XRD、FTIR 和 N 2 进行表征吸附。合成的 Ag-Mg-MOF 样品用于去除重金属。结果表明,随着pH值的增加,镉、铅和铜离子在MOF上的吸附得到改善。通过 Freundlich 和 Langmuir 模型检查实验数据。制备的Ag-Mg MOFs在高吸附容量方面表现出对Cu 2+、Cd 2+和Pb 2离子的增强去污性能,Pb 2+ (350 mg/g)> Cd 2+ (270 mg/g)> Cu 2+(202 mg/g),以及与单金属 Mg-MOF 相比的超快动力学。吸附吡啶法和非水电位滴定法的 FT-IR 光谱用于测量制备的 MOF 的表面酸度。观察到与单金属 MOF 相比,双金属 MOF 的表面酸性和催化活性增加。游离溶剂14-芳基-14-Hdibenzo[ a,j]生成的催化结果] 呫吨化合物通过 Ag-Mg MOF 在较短的时间内显示出高产率。此外,即使在第 4 次运行后,制备的 MOF 催化剂仍保持其初始催化活性。这项工作的结果表明,新型 Ag-Mg MOFs 纳米催化剂在环境保护方面具有巨大的应用潜力,特别是在去除废水中存在的重金属离子以及合成具有药理和生物活性的化合物方面。

更新日期:2021-06-03
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