Silver Ion Adsorption using Alkali and Organosilane Modified Coconut Pith Biosorbents

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Abstract
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.
Funding Information
  • Ministry of Agriculture, Malaysia: eScience Research Program (Project No. 05-01-06-SF1006-79410)
  • 2009 ExxonMobil Research Grant (Project No. 73339)
  • Universiti Teknologi Malaysia (GUP 00H63)
  • Ministry of Higher Education, Malaysia (GUP 00H63)

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