4.7 Article

Silver metal organic frameworks and copper metal organic frameworks immobilized on graphene oxide for enhanced adsorption in water treatment

期刊

CHEMICAL ENGINEERING JOURNAL
卷 439, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135542

关键词

Metal-organic framework; Water treatment; Wastewater treatment; Dye adsorption; Graphene-oxide; Langmuir; Freundlich; Temkin

资金

  1. United States Geological Survey (USGS) [20-WRC-207214]
  2. Environmental Protection Agency (EPA) [84014501]
  3. Department of Chemical and Biological Engineering at the University of Alabama
  4. Alabama Water Institute at the University of Alabama

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In this study, copper and silver metal organic frameworks were successfully synthesized and immobilized on graphene oxide, forming GO-Ag-MOF and GO-Cu-MOF materials. These materials exhibited enhanced physicochemical properties and adsorption capacities, showing high removal efficiency for the tested dye.
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

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