Insights into the adsorption performance and mechanism of Cr(VI) onto porous nanocomposite prepared from gossans and modified coal interface: Steric, energetic, and thermodynamic parameters interpretations

doi:10.1016/j.cjche.2023.02.016

Chinese Journal of Chemical Engineering ›› 2023, Vol. 61 ›› Issue (9): 118-128.DOI: 10.1016/j.cjche.2023.02.016

Insights into the adsorption performance and mechanism of Cr(VI) onto porous nanocomposite prepared from gossans and modified coal interface: Steric, energetic, and thermodynamic parameters interpretations

Mohamed Mobarak¹, Saleh Qaysi², Mohamed Saad Ahmed², Yasser F. Salama³, Ahmed Mohamed Abbass⁴, Mohamed Abd Elrahman⁵, Hamdy A. Abdel-Gawwad⁶, Moaaz K. Seliem⁷

1. Physics Department, Faculty of Science, Beni-Suef University, 62511, Egypt;
2. Geology and Geophysics Department, College of Science, King Saud University, P.O. Box 2455, 11451 Riyadh, Saudi Arabia;
3. Geology Department, Faculty of Science, Beni-Suef University, Egypt;
4. Department of Building Materials, and Construction Chemistry, Institute of Civil Engineering, Technische Universität Berlin, Berlin, Germany;
5. Structural Engineering Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt;
6. Raw Building Materials and Processing Technology Research Institute, Housing and Building National Research Center (HBRC), Cairo, Egypt;
7. Faculty of Earth Science, Beni–Suef University, 62511, Egypt

Received:2022-12-04 Revised:2023-02-25 Online:2023-12-14 Published:2023-09-28
Contact: Yasser F. Salama,E-mail:yasser.salama@science.bsu.edu.eg
Supported by:
This work was supported by Researchers Supporting Project number (RSP2023R455), King Saud University, Riyadh, Saudi Arabia.

Insights into the adsorption performance and mechanism of Cr(VI) onto porous nanocomposite prepared from gossans and modified coal interface: Steric, energetic, and thermodynamic parameters interpretations

Mohamed Mobarak¹, Saleh Qaysi², Mohamed Saad Ahmed², Yasser F. Salama³, Ahmed Mohamed Abbass⁴, Mohamed Abd Elrahman⁵, Hamdy A. Abdel-Gawwad⁶, Moaaz K. Seliem⁷

1. Physics Department, Faculty of Science, Beni-Suef University, 62511, Egypt;
2. Geology and Geophysics Department, College of Science, King Saud University, P.O. Box 2455, 11451 Riyadh, Saudi Arabia;
3. Geology Department, Faculty of Science, Beni-Suef University, Egypt;
4. Department of Building Materials, and Construction Chemistry, Institute of Civil Engineering, Technische Universität Berlin, Berlin, Germany;
5. Structural Engineering Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt;
6. Raw Building Materials and Processing Technology Research Institute, Housing and Building National Research Center (HBRC), Cairo, Egypt;
7. Faculty of Earth Science, Beni–Suef University, 62511, Egypt

通讯作者: Yasser F. Salama,E-mail:yasser.salama@science.bsu.edu.eg
基金资助:
This work was supported by Researchers Supporting Project number (RSP2023R455), King Saud University, Riyadh, Saudi Arabia.

Abstract

Abstract: Herein, iron oxide/hydroxides deposits (gossans) were utilized, for the first time, in the fabrication of magnetite nanoparticles (MNPs) to load modified coal (MC). The as-synthesized MNPs@MC composite was characterized via different techniques and utilized for the Cr(VI) remediation. Experimental studies supported by theoretical treatment were applied to offer a new overview of the Cr(VI) adsorption geometry and mechanism at 25–45 ℃. Experimental results suggested that the Cr(VI) uptake was mainly governed by adsorption–reduction coupled mechanism. The Langmuir model fitted well the Cr(VI) adsorption data with maximum adsorption capacities extended from 115.24 to 129.63 mg·g^-1. Theoretical calculations indicated that Cr(VI) ions were adsorbed on the MNPs@MC following the theory of the advanced monolayer statistical model. The number of ions removed per site ranged from 1.88 to 1.23 suggesting the involvement of vertical geometry and multi-ionic mechanism at all temperatures. The increment of the active sites density and the adsorption capacity at saturation with improving temperature reflected an endothermic process. Energetically, the Cr(VI) adsorption was controlled by physical forces as the adsorption energies were less than 40 kJ·mol^-1. The calculated free enthalpy, entropy, and internal energy explained the spontaneous nature and the viability of Cr(VI) adsorption on the MNPs@MC adsorbent. These results offer a new approach in utilizing the iron-rich deposits as gossans in the preparation of magnetic and low-cost adsorbents for wastewater remediation.

Key words: Coal, Magnetic nanoparticles, Cr(VI) adsorption, Statistical models, Thermodynamic parameters

摘要： Herein, iron oxide/hydroxides deposits (gossans) were utilized, for the first time, in the fabrication of magnetite nanoparticles (MNPs) to load modified coal (MC). The as-synthesized MNPs@MC composite was characterized via different techniques and utilized for the Cr(VI) remediation. Experimental studies supported by theoretical treatment were applied to offer a new overview of the Cr(VI) adsorption geometry and mechanism at 25–45 ℃. Experimental results suggested that the Cr(VI) uptake was mainly governed by adsorption–reduction coupled mechanism. The Langmuir model fitted well the Cr(VI) adsorption data with maximum adsorption capacities extended from 115.24 to 129.63 mg·g^-1. Theoretical calculations indicated that Cr(VI) ions were adsorbed on the MNPs@MC following the theory of the advanced monolayer statistical model. The number of ions removed per site ranged from 1.88 to 1.23 suggesting the involvement of vertical geometry and multi-ionic mechanism at all temperatures. The increment of the active sites density and the adsorption capacity at saturation with improving temperature reflected an endothermic process. Energetically, the Cr(VI) adsorption was controlled by physical forces as the adsorption energies were less than 40 kJ·mol^-1. The calculated free enthalpy, entropy, and internal energy explained the spontaneous nature and the viability of Cr(VI) adsorption on the MNPs@MC adsorbent. These results offer a new approach in utilizing the iron-rich deposits as gossans in the preparation of magnetic and low-cost adsorbents for wastewater remediation.

关键词: Coal, Magnetic nanoparticles, Cr(VI) adsorption, Statistical models, Thermodynamic parameters

Mohamed Mobarak, Saleh Qaysi, Mohamed Saad Ahmed, Yasser F. Salama, Ahmed Mohamed Abbass, Mohamed Abd Elrahman, Hamdy A. Abdel-Gawwad, Moaaz K. Seliem. Insights into the adsorption performance and mechanism of Cr(VI) onto porous nanocomposite prepared from gossans and modified coal interface: Steric, energetic, and thermodynamic parameters interpretations[J]. Chinese Journal of Chemical Engineering, 2023, 61(9): 118-128.

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Insights into the adsorption performance and mechanism of Cr(VI) onto porous nanocomposite prepared from gossans and modified coal interface: Steric, energetic, and thermodynamic parameters interpretations

Insights into the adsorption performance and mechanism of Cr(VI) onto porous nanocomposite prepared from gossans and modified coal interface: Steric, energetic, and thermodynamic parameters interpretations

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