Silver ion adsorption using alkali and organosilane modified coconut pith biosorbents

• Main Authors: Saman, Norasikin, Johari, Khairiraihanna, Tien, Songshiow, Mat, Hanapi
• Format: Article
• Language: English
• Published: Taylor and Francis Ltd. 2015
• Subjects: TP Chemical technology
• Online Access: http://eprints.utm.my/id/eprint/55974/1/NorasikinSaman2015_SilverIonAdsorptionUsingAlkaliandOrganosilane.pdf; http://eprints.utm.my/id/eprint/55974/; http://dx.doi.org/10.1080/15440478.2014.923360

The coconut pith biosorbents were prepared by modifying coconut pith (CP) with sodium hydroxide and bis(triethoxysilylpropyl) tetrasulfide to enhance its sorption capacity and selectivity toward silver ion [Ag(I)]. It was found that the Ag(I) sorption capacity of pure CP, CP modified with sodium hydroxide, and CP modified with bis(triethoxysilylpropyl) tetrasulfide was 0.50, 0.48, and 0.62 mmol/g, respectively. The Ag(I) equilibrium data were best fitted to the Langmuir isotherm model, whereas the kinetic data obeyed the pseudo-second-order kinetic model with the anticipation of the film diffusion as the rate-limiting step. The sorption process was generally governed by a combination of physical and chemical sorption mechanisms. The Ag(I) sorption capacity and selectivity of coconut pith biosorbents were low as compared with other metal ions.