Enhancing Acidic Dye Adsorption by Updated Version of UiO-66

Abstract

In this study, two improved versions of UiO-66 were successfully synthesised. Modified UiO-66 and UiO-66-Ce were characterised to confirm the integrity of the structure, the stability of functional groups on the surface and the thermal stability. Activated samples were used for removal harmful anionic dye (methyl orange) (MO) from wastewater. Batch adsorption process was relied to investigate the competition between those MOFs for removing MO from aqueous solution. Based on the results, at a higher initial concentration, the maximum MO uptake was achieved by UiO-66-Ce which was better than modified-UiO-66. They adsorbed 71.5 and 62.5 mg g-1 respectively. Langmuir and Freundlich isotherms were employed to simulate the experimental data. In addition, Pseudo first order and Pseudo second order equations were used to describe the dynamic behaviour of MO through the adsorption process. The high adsorption capacities on these adsorbents can make them promised adsorbents in industrial areas.

Mn3O4/Vulcan XC-72R composites: preparation, physicochemical characterization and electrochemical study for purification of organic contaminants

“…Various chemical, physical and biological processes for cleaning organic pollutants from water, such as coagulation-flocculation, adsorption, ion exchange, membrane electrodialysis, photocatalytic, filtration and various types of extraction, have been studied and applied. These studied methods are not cost-effective and are not able to completely remove phenolic compounds [4,[7][8][9][10][11].…”

Mn3O4 Catalysts for Advanced Oxidation of Phenolic Contaminants in Aqueous Solutions

“…Different biological, chemical, and physical processes have been applied to remove organic pollutants from an aqueous solution, such as adsorption, biodegradation, coagulationflocculation, ion exchange, photocatalytic, membrane electrodialysis and filtration, and solvent extraction. These strategies are incapable of completely removing phenolic compounds, require more extended time, and are not cost-effective [3,[6][7][8][9][10][11]. Advanced oxidation processes (AOPs) have been proven to be a promising alternative to water treatment due to their compelling oxidation potential for the mineralization of organic pollutants [12].…”

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“…These active radicals easily react with any organic compound without exception, especially organic compounds that have been difficult or cannot be decomposed by microbiological methods or membrane filtration. In addition, the final product of the oxidation process is only carbon dioxide and water, so it is less dangerous if discharged into water bodies [6][7][8].…”