Adsorption characteristics of tryptophan onto nanosilica synthesized from rice husk
Abstract
The present study investigated adsorption of amino acid Tryptophan (Trp) on nanosilica (SiO2). Nanosilica which was successfully synthesized from rice husk, was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Transmission electron microscopy (TEM), and zeta potential measurements. Some effective conditions affect to the adsorption of Trp onto nanosilica such as pH, ionic strength, adsorbent dosage, adsorption time were systematically studied. Adsorption of Trp onto nanosilica increased with increasing pH because the higher negatively charged SiO2 surface is obtained at high pH. Maximum adsorption capacities of Trp onto nanosilica were achieved with adsorption time 180 min, pH 10 and adsorbent dosage 10 mg/mL and ionic strength 50 mM KCl. Adsorption of Trp onto nanosilica increased with increasing salt from 0 to 50 mM KCl. Nevertheless, adsorption of Trp was independent on the ionic strength at higher than 50 mM KCl. Based on the change in surface charge by zeta potential measurement and adsorption kinetics, we confirm that the adsorption of Trp on nanosilica was controlled by both electrostatic and non-electrostatic interactions.
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