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Kombinasi Biosorben Serbuk Buah Jabon Putih (Anthocephalus Cadamba Miq.) Dengan Air Gambut Untuk Adsorpsi Malachite Green
White jabon fruit (Anthocephalus cadamba Miq.) has the potential to be used as a biosorbent because it contains cellulose which can be enhanced by activation. Activation in this study using NaOH and combined with humic compounds from peat water such as humic acid is expected to increase the surface area and increase the active sites on the biosorbent. This study aims to determine the efficiency and adsorption capacity of white jabon fruit powder biosorbent in adsorbing malachite green and determine the appropriate adsorption kinetics model. The method used in the study was batch adsorption of malachite green using variations in biosorbent dosage (0.05; 0.1; 0.15; 0.2 and 0.25 g), variations in solution pH (2, 4, 6 and 8) and variations in contact time (20, 30, 40 and 50 minutes). The surface morphology of the biosorbent was analyzed using SEM-EDS, the pore size of the biosorbent was determined using ImageJ software. The functional groups on the biosorbent were analyzed using FTIR instrument. Characterization using SNI standard No.06-3730-1995 which includes iodine absorption and methylene blue absorption tests. Analysis using UV-Vis spectrophotometer was used to determine the absorbance of malachite green before and after adsorption. Adsorption parameters were obtained at the best biosorbent dose of 0.2 g, optimum solution pH of pH 4 and optimum contact time of 40 min with adsorption efficiency of 98.41% and adsorption capacity of 12.2429 mg/g. The adsorption kinetics model is in accordance with the second-order pseudo with R2 of 0.9995 with a reaction rate constant of 0.1316 g/mg min. Based on the research, it can be concluded that white jabon fruit powder biosorbent is effective in adsorbing malachite green and parameters such as biosorbent dosage, solution pH and contact time are proven to affect the efficiency and capacity of adsorption.
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