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Submitted: 04 Feb 2021
Revision: 11 Apr 2021
Accepted: 01 May 2021
ePublished: 29 Dec 2021
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Avicenna J Environ Health Eng. 2021;8: 61-73.
doi: 10.34172/ajehe.2021.09
  Abstract View: 283
  PDF Download: 134

Original Article

Lignocellulose Nanofiber Media for the Enhanced Removal of Copper From Aqueous Solutions

Saeedeh Rastegar 1* ORCID logo, Mansoor Ghaffari 2, Homa Hoseini 3

1 Department of Environmental Sciences, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Recourses, Environmental Sciences, Gorgan, Iran
2 Department of Wood, Imam Khomeini Technical and Vocational School, Aliabad Katoul, Golestan Technical and Vocational University, Iran
3 Department of Environmental Pollution, Baharan Higher Education Institute, Gorgan, Iran
*Corresponding Author: *Correspondence to Saeedeh Rastegar, Email: , Email: saeedehrastgar@yahoo. com

Abstract

Nowadays, the entry of heavy metals entry into aqueous environments has jeopardized the health of human societies. The experiment was conducted in discontinuous conditions, and the study focused on examining the effect of five parameters including initial concentration, temperature, contact time, pH, and adsorbent dose on the adsorption of Cu heavy metals. In addition, the two-parameter models of Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich were studied and compared to evaluate isothermal absorption. The highest correlation coefficients were obtained for Freundlich (0.969) and Dubinin-Radushkevich (0.9603) models. Finally, thermodynamic parameters such as enthalpy and entropy changes and Gibbs-free energy were calculated as well. The pH parameters, adsorption dose, contact time, temperature, and initial Cu concentrations in the discontinuous system had a statistically significant effect on the adsorption process. The results showed that the maximum efficiency of Cu adsorption by Lignocellulose nanofiber (LCNF) occurred at the pH of 6, contact time of 60 minutes, the ambient temperature of 25°C, and adsorption dose of 0.2 g. In the case of adsorption kinetics, the pseudo-second order model and intra-particle diffusion had more fitness with the experimental data indicating a chemical equilibrium between the adsorbate and the absorbent. Thermodynamic studies demonstrated that the process (negative ΔG) is spontaneous (negative ΔG), endothermic (negative ΔH), and non-random (positive ΔS). Thus, LCNF can be used as an effective adsorbent in the removal of metals by having an extremely high surface area.
Keywords: Copper, Adsorption, LCNF, Isotherm, Kinetics, Thermodynamics,


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