Adsorption thermodynamics and kinetics of hydrochloric-acid-modified bentonite for Zn(II) in wastewater
In order to study the Zn(II) adsorption characteristics of hydrochloric-acid-modified bentonite in wastewater, physical characterization of hydrochloric-acid-modified bentonite was carried out, the effects of the initial concentration, reaction time, and temperature on the Zn(II) adsorption were inv...
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Elsevier
2024-01-01
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| Series: | Desalination and Water Treatment |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1944398624003126 |
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| author | Xiumin Yang Fujun Zhao |
| author_facet | Xiumin Yang Fujun Zhao |
| author_sort | Xiumin Yang |
| collection | DOAJ |
| description | In order to study the Zn(II) adsorption characteristics of hydrochloric-acid-modified bentonite in wastewater, physical characterization of hydrochloric-acid-modified bentonite was carried out, the effects of the initial concentration, reaction time, and temperature on the Zn(II) adsorption were investigated, and the adsorption kinetics and thermodynamic mechanism of the hydrochloric-acid- modified bentonite adsorption of Zn(II) were examined. The results showed that hydrochloric acid modification increased the interlayer spacing of the bentonite, and the structure of the binding between slices became looser. Hydrochloric acid modification altered the hydroxyl groups on the bentonite surface, and the hydrophilicity was enhanced. The Zn(II) adsorption capacities of bentonite and hydrochloric-acid-modified bentonite increased with the increase in the initial Zn(II) concentration, and the adsorption followed the Langmuir and Freundlich equations. The thermodynamic parameters suggested that the adsorption of Zn(II) was an endothermic, spontaneous, and entropy-increasing process. The adsorption basically reached equilibrium within 120 min, and the adsorption followed the quasi-second-order adsorption kinetic equation. The adsorption process was mainly chemical adsorption, and the intra-particle diffusion process was not the only step controlling the adsorption rate. This study provides a theoretical basis for the remediation of toxic metal wastewater and contaminated soil. |
| format | Article |
| id | doaj-art-06d2ba8696194bf89db230fc93650e79 |
| institution | OA Journals |
| issn | 1944-3986 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
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| series | Desalination and Water Treatment |
| spelling | doaj-art-06d2ba8696194bf89db230fc93650e792025-08-20T02:01:15ZengElsevierDesalination and Water Treatment1944-39862024-01-0131710027910.1016/j.dwt.2024.100279Adsorption thermodynamics and kinetics of hydrochloric-acid-modified bentonite for Zn(II) in wastewaterXiumin Yang0Fujun Zhao1Zhai Mingguo Academician workstation, University of Sanya, Sanya 572022, China; School of International Design, University of Sanya, Sanya 572022, China; Corresponding author at: Zhai Mingguo Academician workstation, University of Sanya, Sanya 572022, China.School of Information and Intelligence Engineering, University of Sanya, Sanya 572022, ChinaIn order to study the Zn(II) adsorption characteristics of hydrochloric-acid-modified bentonite in wastewater, physical characterization of hydrochloric-acid-modified bentonite was carried out, the effects of the initial concentration, reaction time, and temperature on the Zn(II) adsorption were investigated, and the adsorption kinetics and thermodynamic mechanism of the hydrochloric-acid- modified bentonite adsorption of Zn(II) were examined. The results showed that hydrochloric acid modification increased the interlayer spacing of the bentonite, and the structure of the binding between slices became looser. Hydrochloric acid modification altered the hydroxyl groups on the bentonite surface, and the hydrophilicity was enhanced. The Zn(II) adsorption capacities of bentonite and hydrochloric-acid-modified bentonite increased with the increase in the initial Zn(II) concentration, and the adsorption followed the Langmuir and Freundlich equations. The thermodynamic parameters suggested that the adsorption of Zn(II) was an endothermic, spontaneous, and entropy-increasing process. The adsorption basically reached equilibrium within 120 min, and the adsorption followed the quasi-second-order adsorption kinetic equation. The adsorption process was mainly chemical adsorption, and the intra-particle diffusion process was not the only step controlling the adsorption rate. This study provides a theoretical basis for the remediation of toxic metal wastewater and contaminated soil.http://www.sciencedirect.com/science/article/pii/S1944398624003126Hydrochloric acid-modified bentoniteZn(II)Adsorption thermodynamicsAdsorption kinetics |
| spellingShingle | Xiumin Yang Fujun Zhao Adsorption thermodynamics and kinetics of hydrochloric-acid-modified bentonite for Zn(II) in wastewater Desalination and Water Treatment Hydrochloric acid-modified bentonite Zn(II) Adsorption thermodynamics Adsorption kinetics |
| title | Adsorption thermodynamics and kinetics of hydrochloric-acid-modified bentonite for Zn(II) in wastewater |
| title_full | Adsorption thermodynamics and kinetics of hydrochloric-acid-modified bentonite for Zn(II) in wastewater |
| title_fullStr | Adsorption thermodynamics and kinetics of hydrochloric-acid-modified bentonite for Zn(II) in wastewater |
| title_full_unstemmed | Adsorption thermodynamics and kinetics of hydrochloric-acid-modified bentonite for Zn(II) in wastewater |
| title_short | Adsorption thermodynamics and kinetics of hydrochloric-acid-modified bentonite for Zn(II) in wastewater |
| title_sort | adsorption thermodynamics and kinetics of hydrochloric acid modified bentonite for zn ii in wastewater |
| topic | Hydrochloric acid-modified bentonite Zn(II) Adsorption thermodynamics Adsorption kinetics |
| url | http://www.sciencedirect.com/science/article/pii/S1944398624003126 |
| work_keys_str_mv | AT xiuminyang adsorptionthermodynamicsandkineticsofhydrochloricacidmodifiedbentoniteforzniiinwastewater AT fujunzhao adsorptionthermodynamicsandkineticsofhydrochloricacidmodifiedbentoniteforzniiinwastewater |