<![CDATA[Rice husk waste can be utilized as a source of silica with a silica content of 86.90-97.30 %, which has potential as a silica-based material. Similarly, chitin sources are abundant in crustacean shells (crabs, shrimps, lobsters etc.), the combination of chitin-silica (Ki-Sil) as a composite is very interesting to study. So this research aims to synthesize Ki-Sil composite and its application as adsorbent of Fe(III) and Cr(III) metal ions. At first, the extraction of rice husk silica was carried out and then the synthesis of Ki-Sil composites. The obtained composite was optimized for pH with pH variation (2-6), adsorption capacity with concentration variation (50-150 ppm) and adsorption selectivity test of both metal ions with ratio (0.25:0.75; 0.75:0.25 and 1:1). Analysis of Ki-Sil functional groups using FTIR shows that the synthesis has been successful with wave numbers that match the standard and morphological analysis using SEM which shows the composite material is a porous material. The results obtained optimum pH 4 for adsorption of both target metals. The adsorption capacity of Fe(III) metal was 31.49 mg/g; 69.69mg/g; 89.83 mg/g and 138.57 mg/g, respectively. And the adsorption capacities of Cr(III) metal were 37.80 mg/g; 70.86 mg/g; 89.98 mg/g and 138.84 mg/g, respectively. The selectivity test results showed that Ki-Sil adsorbed Fe(III) metal by 0.9820 mmol and Cr(III) metal by 0.9949 mmol. It is concluded that the Ki-Sil composite is more selective in adsorbing Cr(III) metal.]]>
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