DOI: https://doi.org/10.55373/mjchem.v26i2.1

Keywords: Amine grafting; nitrate; phosphate; adsorption; OMS-2

Abstract

The combination of amine groups and an OMS-2 carrier matrix resulted in a new material (Amine-OMS-2) that could be used for the effective adsorption of nitrate and phosphate ions in water. This material was then characterized by SEM, XRD, FTIR, TGA, and BET. In nitrate and phosphate adsorption tests, Amine-OMS-2 reached adsorption equilibrium after 30 and 60 min, respectively. Adsorption using Amine-OMS-2 followed an apparent second-order kinetic model with maximum adsorption capacities of 34.1 mg g-1 (pH 5, nitrate) and 12.2 mg g-1 (pH 6, phosphate). Adsorption capacity was proportional to initial anion concentration and inversely proportional to temperature. In the treatment of real wastewater, Amine-OMS-2 was found to be a multi-purpose adsorbent for removing nitrate, phosphate and organics simultaneously, with high adsorption capacities of 11.1 mg g-1, 16.8 mg g-1, and 22.4 mg COD L-1. These results demonstrate the ability of Amine-OMS-2 to remove excess nutrients and organic components in wastewater.