Study of kinetics, and thermodynamics of nikel adsorption from aqueous solutions using modified nano-graphene oxide by melamine

Document Type : ORIGINAL RESEARCH PAPER

Authors

1 Gorgan University of Agricultural Sciences and Natural Resources.

2 Gorgan University of Agricultural Sciences and Natural Resources

10.22034/ap.2021.1929112.1104

Abstract

one of the most important issues in water resources today is pollution caused by heavy metals. Nickel is a heavy metal that is widely used in various industries. Nickel is one of the most important pollutants in the environment and its removal is very important. There are different methods for separating heavy metals from aqueous media. Among all methods, surface adsorption is a low-cost and simple method and for removing heavy metals in low and medium concentrations. The aim of this study was to investigate the adsorption efficiency of nickel ions from aqueous solutions using melamine modified nano-graphene oxide.The experiments were performed under discontinuous conditions and the five parameters of initial concentration, contact time, temperature, pH and adsorbent dose were optimized. The pseudo-first-order and psedo-second-order kinetic models were investigated. Finally, thermodynamic parameters such as enthalpy and entropy change and Gibbs free energy were calculated.In the kinetic study, by comparing the coefficient of explanation of the pseudo-first-order model (0.3084) and the pseudo -second-order model (0.997), it was found that pseudo -second-order model better shows the adsorption process of nickel by the adsorbent. oxide nanoparticles is spontaneous and the reaction is accompanied by an increase in irregularity and endotherm. The adsorbent surface is multilayered, non-uniform and the adsorbent material on the adsorbent is heterogeneous. Nano graphene oxide modified by melamine has a special surface and high potential and is a suitable adsorbent for removing nickel from aqueous solutions and has a high absorption.

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Main Subjects


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Volume 5, Issue 2 - Serial Number 9
September 2021
Pages 39-46
  • Receive Date: 30 April 2021
  • Revise Date: 05 June 2021
  • Accept Date: 25 August 2021
  • First Publish Date: 31 August 2021