Adsorption of Metal Cr(Iii) On Amino-Silica Hybrid From Rice Hull Ash

Abstract

In this research, adsorption of Cr(III) on amino-silica hybrid(ASH) prom rice hull ash has been investigated.

Synthesis amino-silica hybrid (ASH) was carried out by adding HCl 3 M to the mixture of (3-aminopropyl)-trimethoxysilane and sodium silicate solution was obtained from destruction of rice hull ash with NaOH. The adsorbents were characterized by infrared spectrophotometer (FTIR) and X-ray diffraction (XRD). Adsorption of Cr(III) on ASH was conducted in a batch system for one hour by varying concentration of metal ion. The adsorbed metal ion was calculated based and after adsorption that was analyzed by AAS method.

Characterization with FTIR showed that ASH has been success of synthesized which was indicated by appearing the absorbance of functional groups Si-OH (silanol), Si-O-Si (siloksan), and -NH₂ (amino). The XRD data showed the structure of ASH was amorphous. The research showed that hybridization increases the adsorption capacity for metal ions Cr(III).

Key words : rice hull ash, amino-silica hybrid, adsorption