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Sintesis Dan Karakterisasi Komposit Hidroksiapatit-Gelatin (K-Hap/Gel) Serta Uji Efektivitas Daya Serap Terhadap Methylene Blue Dan Methyl Orange
Composite is a material that is formed from two or more materials with different properties, so that materials with different properties and characteristics are produced. Composite consists of reinforcement and a matrix. In this study, hydroxyapatite was acted as a matrix and the reinforcement was derived from gelatin. The purpose of this study was to synthesize hydroxyapatite-gelatin composites using the microwave method with diammonium hydrogen phosphate (NH4)2HPO4, and Ca(OH)2 precursors and adsorption tests on methylene blue and methyl orange. The results of the hydroxyapatite mineral phase analysis showed the highest peak at 2θ = 25.976°, functional group analysis showed that the hydroxyapatite absorption band was the presence of OH-, PO43- groups, the results of the hydroxyapatite morphological analysis showed that it showed round and bar morphology while after being composited it became sand-like. The best surface area analysis result is K-HAp/Gel 10% was 12.7184 m2/g. The best pore volume analysis was K-HAp/Gel 10% 0.02911 cc/g and the best pore diameter analysis was K-HAp/Gel 0% 0.58723 nm. Based on the results of adsorption of methylene blue using hydroxyapatite-gelatin composites, the optimum conditions for each variation of contact time, adsorbate concentration and adsorbent mass were obtained, at K-HAp/Gel 0% were 10 minutes, 10 ppm and 10 mg (60.612%); K-HAp/Gel 10% were 10 minutes, 10 ppm and 5 mg (76.593%); K-HAp/Gel 20% were 20 minutes, 10 ppm and 10 mg (77.110%) while for K-HAp/Gel 30% were 10 minutes, 10 ppm and 25 mg (79.903%). The optimum conditions for adsorption of methyl orange are K-HAp/Gel 0% were 5 minutes,40 ppm and 5 mg (14.177%); K-HAp/Gel 10% were 20 minutes, 40 ppm and 5 mg (12,743%); K-HAp/Gel 20% were 30 minutes, 10 ppm and 5 mg (10.591%) and K-HAp/Gel 30% were 30 minutes, 10 ppm and 5 mg (9.977%). Both of these adsorption models follow the Langmuir adsorption isotherm pattern and the adsorption kinetics lead to a pseudo second order.
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