Abstract:
Today supply of clean water is one of the utmost significant universal issues due to ongoing economic expansion and the continuous upsurge in the worldwide population. Clean water sources are reducing each day because of contagion with various organic and inorganic pollutants. Fertilizers, organic dyes, phenols, plasticizers, detergents, pharmaceuticals, pesticides, and aromatics are typical toxins that should be removed from drinking and wastewater. Among different wastewater treatment approaches adsorption gives a simple, ease of equipment design, low cost and one of the most commonly used solution. Metal Organic Frameworks (MOFs) have appeared as a new class of adsorbent materials, which gained attention over the last two decades due to their large surface area, tunable pore size and ease of synthesis. They are reported to be potential candidate for the adsorption of dyes and heavy metals in waste water treatment. In present work, six metal organic frameworks have been synthesized by solvothermal process using nickel, cobalt and magnesium metals as inorganic part whereas oxalic acid and phthalic acid were used as organic linkers. Characterization of these lab prepared MOFs was done by FT-IR spectroscopy, XRD, SEM, and TGA analysis. Subsequently, these MOFs were studied for their adsorption capacity for three organic dyes namely, Methylene Blue (MB), Methyl Orange (MO) and Methyl Red (MR) from aqueous solution. The adsorption mechanism was studied in batch process by using UV-Visible Spectroscopy. Among series, Ni-Oxalic MOF showed highest capacity for adsorption of dyes from aqueous solution. Kinetic study of dyes adsorption by MOFs illustrates that adsorption process follow pseudo second order kinetic model.
Keywords: Metal Organic Framework, Solvothermal Method, Oxalic Acid, Phthalic Acid, Organic Dyes, Adsorption, Kinetics.
