Lignocellulose Nanofiber Media for the Enhanced Removal of Copper From Aqueous Solutions
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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Hamadan University of Medical Sciences
2021-12-01
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| Series: | Avicenna Journal of Environmental Health Engineering |
| Subjects: | |
| Online Access: | https://ajehe.umsha.ac.ir/PDF/ajehe-8-61.pdf |
| _version_ | 1827803488157958144 |
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| author | Saeedeh Rastegar Mansoor Ghaffari Homa Hoseini |
| author_facet | Saeedeh Rastegar Mansoor Ghaffari Homa Hoseini |
| author_sort | Saeedeh Rastegar |
| collection | DOAJ |
| description | 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 ∆G) is spontaneous (negative ∆G), endothermic (negative ∆H), and non-random (positive ∆S). Thus, LCNF can be used as an effective adsorbent in the removal of metals by having an extremely high surface area. |
| first_indexed | 2024-03-11T20:56:05Z |
| format | Article |
| id | doaj.art-b249bf41186142dcb1c041350d379e5e |
| institution | Directory Open Access Journal |
| issn | 2423-4583 |
| language | English |
| last_indexed | 2024-03-11T20:56:05Z |
| publishDate | 2021-12-01 |
| publisher | Hamadan University of Medical Sciences |
| record_format | Article |
| series | Avicenna Journal of Environmental Health Engineering |
| spelling | doaj.art-b249bf41186142dcb1c041350d379e5e2023-09-30T10:06:15ZengHamadan University of Medical SciencesAvicenna Journal of Environmental Health Engineering2423-45832021-12-0182617310.34172/ajehe.2021.09ajehe-4171Lignocellulose Nanofiber Media for the Enhanced Removal of Copper From Aqueous SolutionsSaeedeh Rastegar0Mansoor Ghaffari1Homa Hoseini2Department of Environmental Sciences, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Recourses, Environmental Sciences, Gorgan, IranDepartment of Wood, Imam Khomeini Technical and Vocational School, Aliabad Katoul, Golestan Technical and Vocational University, IranDepartment of Environmental Pollution, Baharan Higher Education Institute, Gorgan, IranNowadays, 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 ∆G) is spontaneous (negative ∆G), endothermic (negative ∆H), and non-random (positive ∆S). Thus, LCNF can be used as an effective adsorbent in the removal of metals by having an extremely high surface area.https://ajehe.umsha.ac.ir/PDF/ajehe-8-61.pdfcopperadsorptionlcnfisothermkineticsthermodynamics |
| spellingShingle | Saeedeh Rastegar Mansoor Ghaffari Homa Hoseini Lignocellulose Nanofiber Media for the Enhanced Removal of Copper From Aqueous Solutions Avicenna Journal of Environmental Health Engineering copper adsorption lcnf isotherm kinetics thermodynamics |
| title | Lignocellulose Nanofiber Media for the Enhanced Removal of Copper From Aqueous Solutions |
| title_full | Lignocellulose Nanofiber Media for the Enhanced Removal of Copper From Aqueous Solutions |
| title_fullStr | Lignocellulose Nanofiber Media for the Enhanced Removal of Copper From Aqueous Solutions |
| title_full_unstemmed | Lignocellulose Nanofiber Media for the Enhanced Removal of Copper From Aqueous Solutions |
| title_short | Lignocellulose Nanofiber Media for the Enhanced Removal of Copper From Aqueous Solutions |
| title_sort | lignocellulose nanofiber media for the enhanced removal of copper from aqueous solutions |
| topic | copper adsorption lcnf isotherm kinetics thermodynamics |
| url | https://ajehe.umsha.ac.ir/PDF/ajehe-8-61.pdf |
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