Models, kinetics, and thermodynamics for the adsorption of Ni2+ metal ions by solid tofu waste immobilized on silica's surface

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Abstract

This research aimed to study the models, kinetics, and thermodynamics for the adsorption of Ni2+ metal ions by solid tofu waste immobilized on silica surface. The isothermal adsorption model developed in this study revealed that a temperature of 27oC was required for the adsorption of Ni2+ metal ions in a batch system with pH = 6. Absorption model of Ni2+ ion followed BiLangmuir Model. The real adsorption capacity was between 0.478 mg/L to 4.750 mg/L. The Gibbs free energy for Ni2+ ions adsorption was 2159.57 J/mol within the initial concentration range of about 5,10,20 and 30 ppm and-7769.27 J/mol in the initial concentration range about 40 and 50 ppm. The order of the adsorption kinetics for Ni2+ ions were second order for a concentration range of about 5-50 ppm. The thermodynamic study of adsorption carried out at temperature variations (from 30 to 60oC) was used to determine the average enthalpy adsorption values for Ni2+ ions (111.092 KJ/mol). While the pH of zero charge potential (pHPCZ of adsorbent was 8.40) and the optimum pH for the adsorption of Ni2+ ion is 6.

Original languageEnglish
Pages (from-to)78-87
Number of pages10
JournalMoroccan Journal of Chemistry
Volume8
Issue numberS1
Publication statusPublished - 2020

Keywords

  • Adsorption
  • Kinetics
  • Model
  • Thermodynamics

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