MODIFIKASI SILIKA GEL DENGAN AMINOPROPIL TRIMETOKSISILAN (APTMS) DAN APLIKASINYA SEBAGAI ADSORBEN Cr(VI)
Silica gel (SG) and hybrid aminosilica (HAS) had been prepared and their capability for the adsorption of anions Cr(VI) had been studied. Silica gel was synthesized by adding 3 M HCl solution into a mixture of sodium silicate (Na2SiO3) prepared from rice husk ash as a precursor. HAS was prepared usi...
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| Format: | Thesis |
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[Yogyakarta] : Universitas Gadjah Mada
2012
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| Summary: | Silica gel (SG) and hybrid aminosilica (HAS) had been prepared and their
capability for the adsorption of anions Cr(VI) had been studied. Silica gel was
synthesized by adding 3 M HCl solution into a mixture of sodium silicate
(Na2SiO3) prepared from rice husk ash as a precursor. HAS was prepared using
grafting method by refluxing 3-aminopropyltrimethoxysilane (APTMS) and SG in
toluene. HAS and SG were characterized using infrared spectrophotometry
(FTIR) and X-ray diffraction (XRD). Adsorption studies were carried out using a
batch system with the variation of pH, time and concentration ions of Cr(VI).
Cr(VI) ion adsorbed was quantitatively analyzed by UV-Vis spectrophotometry
using 1,5-diphenilkarbazide as a complex. Freundlich and Langmuir isotherm
models were used to determine the capacity and energy of adsorption. Adsorption
reaction mechanism was studied in solution using a variety of desorbent solution
and levels of alkalinity of the desorbent. The adsorbents were used to adsorb
Cr(VI) ion in chrome plating waste solution.
Adsorption of Cr(VI) on SG and HAS were optimum at pH 1 and 2,
respectively. Adsorption of Cr(VI) on SG and HAS reached equilibrium after 4
hours and 30 minutes respectively. Adsorption kinetics studies showed that the
adsorption of Cr(VI) was followed second-order kinetics model on SG and the
pseudo second order on HAS. The maximum adsorption capacity was 55.8 mg/g
on HAS and 7.6 mg/g on SG. Maximum desorption results achieved at 57.2%
using Na2SO4. Adsorption on chrome plating wastes showed an adsorption of 85.2
%. |
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