<![CDATA[This study aims to determine the optimum pH and adsorption capacity of Fe(III) metal adsorption using chitin- silica composite rice husk. The research phase includes the manufacture of sodium silicate, manufacture of chitin- silica composites, determination of optimum pH and adsorption capacity of Fe(III) metals. Preparation of sodium silicate is done by dissolving using NaOH. Chitinsilica rice husk composites were prepared by reacting sodium silicate solution with chitin. The characterization of chitin-silica composites included functional group analysis using FTIR and morphological analysis using SEM. The adsorption process was carried out with variations in pH (2-6), variations in concentration (50-150 ppm). The results showed that the optimum pH for the adsorption of Fe(III) metals was 4 with the adsorption power 91,42%. The adsorption capacity of Fe(III) metal with concentrations of 50, 80, 100 and 150 ppm were 31.49 mg/g, respectively; 69.69mg/g; 89.83 mg/g and 138.57 mg/g. The adsorption of Fe(III) metal is more suitable for the Langmuir isotherm model compared to Freundlich with a value of R2 = 0.9414.]]>
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