Sintesis dan Analisis Karbon Aktif Ampas Tebu dan Kitosan Kulit Udang sebagai Adsorben Logam Fe dan Mn pada Air Sumur

Abstract

In some areas in Medan Denai district, the availability of pure water sources from water facilities is still unable to meet the needs of the community due to the lack of pure water flowing to residents homes at certain times so that people use well water sources as an alternative for daily needs. In this study, well water was found to contain Fe and Mn metals that exceeded the normal drinking water limit in Medan Denai district. The preparation of composites based on activated carbon from sugarcane bagasse and commercially shrimp-based chitosan for adsorption of Fe and Mn ions in well-water has been successfully carried out. The activated carbon was prepared by two-step methods, i.e., carbonization at 1000°C and acid activation via 5% of H2SO4, and then added into commercially prepared shrimp-based chitosan. The synthesized products were characterized using Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and X-Ray Diffraction (XRD). The experiments were carried out in well-water collected from Medan Denai district, and the adsorption of Fe and Mn metal ions was performed with varying mass compositions and contact times of 30 and 60 minutes, characterized using Atomic Absorption Spectroscopy (AAS). The optimal adsorption capacity and adsorption percentage for Fe were 0.0090 mg/g and 81.16%, respectively, achieved in 60 minutes with commercially shrimp shell chitosan as adsorbent (Ki60). For Mn ions, the optimal adsorption capacity and adsorption percentage were 0.0484 mg/g and 99.26%, respectively, achieved with activated carbon from sugarcane bagasse as the adsorbent in 60 minutes (Ka60). These optimum values indicate that commercially shrimp shell chitosan was effective in reducing Fe ions concentration in well-water and activated carbon from carbonization at 1000°C of sugarcane bagasse was an effective adsorbent for Mn metal ions in well-water.