Kinetic Study of Adsorption of Metal Ions (Iron and Manganese) in Groundwater Using Calcium Carbide Waste

Abstract

This study aims to determine the effectiveness of calcium carbide waste (CCW) as an adsorbent in removing iron ions and manganese ions in groundwater. The presence of iron ions and manganese ions in groundwater is indicated by a reddish color; however, upon contact with air, groundwater oxidation causes iron ions and manganese ions to precipitate. Synthetic groundwater was prepared in this experiment using reagents containing Fe 2SO4 .7H2O and MnSO4.4H2O . Observations were carried out in a batch process to assess the potential and ability of CCW to remove iron and manganese from groundwater. In this study, to achieve equilibrium, CCW was added to 100 mL of synthetic solution and shaken at room temperature with a shaker. Operating time, the concentration of iron ions and manganese ions, and the mass of the CCW are some of the parameters investigated in this study. CCW is an effective adsorbent for reducing the concentration of ferrous ions and manganese ions after 60 minutes of operation. The percentage removal of iron and manganese ions respectively increased from 93.76 to 97.99% for ferric ions and manganese ions from 91.83 to 95.14%. for initial concentration ranges of 40 mg/L, 60 mg/L, 80 mg/L, and 100 mg/L. Furthermore, the adsorption kinetics of the CCW adsorbent in a mixture of iron ion and manganese ion solutions is a pseudo-second-order kinetic model. This also confirms that the adsorption of CCW on ferrous ions and manganese ions is a chemisorption process. The remaining calcium carbide was determined to have the potential to act as an adsorbent for heavy metals in groundwater, particularly iron and manganese ions.

Keywords

• groundwater
• iron
• manganese
• calcium carbide residual