<br>轻松制备双金属 Fe-Mg MOF 用于合成呫吨和去除重金属离子,RSC Advances

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轻松制备双金属 Fe-Mg MOF 用于合成呫吨和去除重金属离子
RSC Advances ( IF 3.9 ) Pub Date : 2020-3-6 , DOI: 10.1039/c9ra10300g
W S Abo El-Yazeed _{1,

2} , Y G Abou El-Reash ₁ , L A Elatwy ₁ , Awad I Ahmed ₁

Affiliation

这项工作报道了通过溶剂热技术制备 Mg-MOF、Fe-MOF 和 Fe-Mg MOF，并通过 FT-IR、XRD、SEM、EDS、TEM 和S _BET分析对其进行表征。纳米粒子直径范围为3.1至10.9 nm。 MOF 的酸度通过正丁胺的非水电位滴定来测量。据观察，双金属 MOF 的形成急剧增加了表面酸性和催化活性。与母体 MOF 相比，Fe-Mg MOF 催化合成 14-芳基-14- H-二苯并[ a , j ]氧杂蒽的催化结果表明，在更短的时间内，在各种条件下，所需产物的产率更高。 Fe: Mg，(0.6:1) Fe-Mg MOF 显示出最高的催化活性和酸性。即使在^第四次运行后，Fe-Mg MOF 催化剂仍然保持了接近初始的催化活性。通过批量实验评估了 Mg-MOF、Fe-MOF 和 Fe-Mg MOF 的吸附性能。讨论了接触时间、溶液pH值、吸附剂剂量和重金属离子初始浓度的影响。结果发现，双金属Fe-Mg MOF对Pb( II )、Cu( II )和Cd( II )的吸附容量高于Mg-MOF和Fe-MOF，动力学数据遵循伪-二级动力学模型和等温数据服从Langmuir等温线模型。讨论了重金属离子的去除机理。

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Facile fabrication of bimetallic Fe–Mg MOF for the synthesis of xanthenes and removal of heavy metal ions

This work reported the preparation of Mg-MOF, Fe-MOF and Fe–Mg MOF by a solvothermal technique and their characterization with FT-IR, XRD, SEM, EDS, TEM and S_BET analyses. The nanoparticle diameter ranged from 3.1 to 10.9 nm. The acidity of the MOFs was measured by nonaqueous potentiometric titration of n-butylamine. It was observed that the formation of a bimetallic MOF sharply increases the surface acidity and the catalytic activity. The catalytic results of the Fe–Mg MOF catalyzing the synthesis of 14-aryl-14-H-dibenzo[a,j]xanthenes in comparison with those of parent MOFs showed a higher yield of the desired product in a lower time and among various Fe : Mg, the (0.6 : 1) Fe–Mg MOF showed the highest catalytic activity and acidity. Even after the 4^th run, the Fe–Mg MOF catalyst still maintained nearly the initial catalytic activity. The adsorption performance of Mg-MOF, Fe-MOF and Fe–Mg MOF was evaluated by batch experiments. The effect of contact time, the solution pH, the adsorbent dose and the initial concentration of the heavy metal ions was discussed. It was found that the capacity of the bimetallic Fe–Mg MOF for Pb(II), Cu(II) and Cd(II) adsorption was higher than that of the Mg-MOF and Fe-MOF, the kinetic data followed the pseudo-second-order kinetic model and the isothermal data obeyed the Langmuir isotherm model. The mechanism of the removal of the heavy metal ions was discussed.

更新日期：2020-03-06

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