Pembuatan dan Karakterisasi Karbon dari Cangkang Kepiting Bakau (Sylla Serrata) sebagai Remediasi Logam Fe pada Air Sumur

Abstract

Research has been conducted on the manufacture and characterization of carbon from mangrove crab (Sylla Serrata) shell waste as a remediation of Fe (iron) metal in well water. Carbon preparation was carried out through carbonization process with temperature variations of 500 ℃, 700 ℃, and 900 ℃ for 4 hours. Adsorption of Fe (iron) metal was carried out using 100 ml of well water mixed into each carbon variation measuring 0.5 g with a contact time of 90 minutes and a stirring speed of 200 rpm. The resulting crab shell carbon was tested for moisture content, ash, volatile matter content, and bound carbon content to determine its characteristics and has met the quality requirements of activated carbon according to SNI 06-3730-1995. Characterization of functional groups on carbon is done using FTIR. Characterization of morphological structure and particle size of carbon was done using SEM, while characterization of crystal structure of carbon was done using XRD. FTIR test results showed that increasing the temperature resulted in the decomposition of alkyl and methyl groups indicating the removal of organic compounds will open up space in the carbon material, potentially creating pores that increase the adsorption properties of carbon. SEM test results at 900°C show that the carbon has smaller, more evenly distributed particles compared to 500°C and 700°C. Meanwhile, XRD test results show that at 500°C and 700°C the carbon has a trigonal crystal structure, while at 900°C a hexagonal crystal structure is formed, increasing the surface area and adsorption capacity. The optimum adsorption capacity for Fe metal absorption based on AAS test results is 0.3502 mg/g with adsorption effectiveness reaching 84.83% with Fe solution concentration after adsorption of 0.313 mg/L from the initial concentration of 2.064 mg/L.