Silver metal organic frameworks and copper metal organic frameworks immobilized on graphene oxide for enhanced adsorption in water treatment
Silver metal organic frameworks and copper metal organic frameworks immobilized on graphene oxide for enhanced adsorption in water treatment
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DOI：
10.1016/j.cej.2022.135542
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发表时间：
2022-03-31
影响因子：
15.1
通讯作者：
Esfahani, Milad Rabbani
中科院分区：
文献类型：
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作者：
Kasula, Medha;Le, Tin;Esfahani, Milad Rabbani
在这项研究中，铜金属有机框架（Cu-MOF）和银金属有机框架（Ag-MOF）的合成和固定的GO片和之间使用超声处理过程。通过zeta电位、BET、XRD和SEM等表征技术，证实了GO-Ag-MOF和GO-Cu-MOF的表面积、表面电荷和活性吸附位点等物化性能得到了增强。此外，在不同的实验条件（pH（3-10）、温度（25-45 ℃）和吸附物浓度（0-150 ppm））下，彻底评价了Ag-MOF、Cu-MOF、GO-Ag-MOF和GO-Cu-MOF材料对作为有机污染物模型的亚甲基蓝染料（MB）的吸附能力。合成的MOF的动力学和热力学行为表明，在所有测试条件下，与原始的Ag-MOF和Cu-MOF相比，GO-Ag-MOF和GO-Cu-MOF都显示出约10%的吸附容量增加。GO-Ag-MOF表现出超过98%的染料去除，其次是Ag-MOF（90%）、GO-Cu-MOF（75%）和CuMOF（65%）。吸附机理主要是基于静电相互作用的单分子层吸附。所有MOFs在三次再生循环后显示出超过80%的再生率
In this study, copper metal organic frameworks (Cu-MOF) and silver metal organic frameworks (Ag-MOF) were synthesized and immobilized on and between GO sheets using an ultrasonication process. The GO-immobilized MOFs (GO-Ag-MOF and GO-Cu-MOF) showed enhanced physicochemical properties, including enhanced surface area, surface charge, and active adsorption sites confirmed with characterization techniques such as zeta potential, Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, the adsorption capacities of Ag-MOF, Cu-MOF, GO-Ag-MOF, and GO-Cu-MOF materials for methylene blue dye (MB), as an organic contaminant model, were thoroughly evaluated at different experimental conditions (pH (3-10), temperature (25-45 degrees C), and adsorbate concentrations (0-150 ppm)). The kinetics and thermodynamic behavior of the synthesized MOFs revealed that both GO-Ag-MOF and GO-Cu-MOF showed around 10% increase in adsorption capacity in comparison to the pristine Ag-MOF and Cu-MOF at all the tested conditions. GO-Ag-MOF exhibited more than 98 % dye removal, followed by Ag-MOF (90%), GO-Cu-MOF (75%), and CuMOF (65%). The main mechanism for adsorption was monolayer adsorption based on electrostatic interactions. All MOFs showed more than 80% re-generability after three regeneration cycles