Author : Vivek Laishram 1
Date of Publication :13th September 2021
Abstract: The present study aims to investigate adsorption of organic ions mainly COD from pretreated stabilized landfill leachate from Manipur, India. Corncob was utilized to synthesize a waste derived Corncob activated carbon (CCAC) and it was employed as a bio-adsorbent in batch mode in this study. For effective adsorption of organic ions, the chemical modification of CCAC was functionalized through treatment with phosphoric acid (H3PO4), in order to induce more number of –OH groups onto the adsorbent surface. The physico chemical properties of the prepared bio-carbon were characterized by their adsorptive nature towards zero point charge to estimate their surface charge density. CCAC was analyzed for morphological and surface characterization by various methods including, Field emission scanning electron microscopy (FESEM), Energy Dispersive X-Ray Analysis (EDAX), Brunauer-Emmett-Teller (BET) surface area. The impacts of adsorption processes such as initial pH, contact time and dose of adsorbent were considered to evaluate the performance of CCAC. CCAC showed maximum COD removal of 88.75% within 120 min contact time, at optimum pH 2. Adsorption kinetics was able to explain by Lagregren’s pseudo-second-order equation suggesting behavior of chemical adsorption of COD on CCAC. Isotherm studies on the adsorption of COD on CCAC can be explained by Langmuir model that revealed the maximum monolayer coverage of 71.7 mg COD/g CCAC.
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