Preparation of ZnAl layered double hydroxides supported by silica for the treatment of Cr(VI) and Cu(II) in aqueous solution
Abstract A novel adsorbent ZnAl–LDHs/SiO2 (ZA/SiO2) was prepared by blending urea mixture of ZnSO4 and Al2(SO4)3 while using SiO2 as a support form. The adsorption properties of ZA/SiO2 for the removal of toxic metal ions (Cu(II) and Cr(VI)) from water were evaluated. By batch experiment method to i...
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2025-01-01
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| author | Fengrong Zhang Luxing Liu Cuilan Zhang Dawei Shang Lishun Wu |
| author_facet | Fengrong Zhang Luxing Liu Cuilan Zhang Dawei Shang Lishun Wu |
| author_sort | Fengrong Zhang |
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| description | Abstract A novel adsorbent ZnAl–LDHs/SiO2 (ZA/SiO2) was prepared by blending urea mixture of ZnSO4 and Al2(SO4)3 while using SiO2 as a support form. The adsorption properties of ZA/SiO2 for the removal of toxic metal ions (Cu(II) and Cr(VI)) from water were evaluated. By batch experiment method to investigate the ZA/SiO2 adsorption of Cu(II) and Cr(VI) solution treatment effect. The sorption kinetics curves of Cu(II) and Cr(VI) on ZA/SiO2 were L-shaped. What’s more, the solid concentration effect was found in the process of sorption kinetics. Langmuir and Freundlich sorption isotherm models were used to analyze the adsorption data. The results showed that the adsorption conforms to Langmuir and Freundlich adsorption isotherm models. However, the adsorption capacity of ZA/SiO2 compounds for Cu(II) and Cr(VI) is greatly improved. The adsorption capacity of Cu(II) is 158 mg·g−1 and of Cr(VI) is 176 mg·g−1, which were 3.6 and 1.8 times of ZnAl-LDHs (ZA), respectively. Density functional theory (DFT) was utilized for the analysis of intrinsic mechanism and specific pathways. The primary mechanism for removing Cr(VI) from water mainly included the intercalation of Cr2O7 2− and exchange between Cr2O7 2− and OH−, excluding Cr(OH)3 precipitation. Regarding the primary mechanism for eliminating Cu(II) from water, it involves isomorphic substitution as the predominant process, except for the formation of Cu(OH)2 precipitates. |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-4bfbf686eed94ae0a4d334c90f3be7c72025-01-26T12:32:39ZengNature PortfolioScientific Reports2045-23222025-01-0115111610.1038/s41598-025-86391-3Preparation of ZnAl layered double hydroxides supported by silica for the treatment of Cr(VI) and Cu(II) in aqueous solutionFengrong Zhang0Luxing Liu1Cuilan Zhang2Dawei Shang3Lishun Wu4School of Chemistry and Chemical Engineering, Heze UniversitySchool of Chemistry and Chemical Engineering, Heze UniversityGuiyang Road Primary SchoolResearch Center for Engineering Ecology and Nonlinear Science, North China Electric Power UniversitySchool of Chemistry and Chemical Engineering, Heze UniversityAbstract A novel adsorbent ZnAl–LDHs/SiO2 (ZA/SiO2) was prepared by blending urea mixture of ZnSO4 and Al2(SO4)3 while using SiO2 as a support form. The adsorption properties of ZA/SiO2 for the removal of toxic metal ions (Cu(II) and Cr(VI)) from water were evaluated. By batch experiment method to investigate the ZA/SiO2 adsorption of Cu(II) and Cr(VI) solution treatment effect. The sorption kinetics curves of Cu(II) and Cr(VI) on ZA/SiO2 were L-shaped. What’s more, the solid concentration effect was found in the process of sorption kinetics. Langmuir and Freundlich sorption isotherm models were used to analyze the adsorption data. The results showed that the adsorption conforms to Langmuir and Freundlich adsorption isotherm models. However, the adsorption capacity of ZA/SiO2 compounds for Cu(II) and Cr(VI) is greatly improved. The adsorption capacity of Cu(II) is 158 mg·g−1 and of Cr(VI) is 176 mg·g−1, which were 3.6 and 1.8 times of ZnAl-LDHs (ZA), respectively. Density functional theory (DFT) was utilized for the analysis of intrinsic mechanism and specific pathways. The primary mechanism for removing Cr(VI) from water mainly included the intercalation of Cr2O7 2− and exchange between Cr2O7 2− and OH−, excluding Cr(OH)3 precipitation. Regarding the primary mechanism for eliminating Cu(II) from water, it involves isomorphic substitution as the predominant process, except for the formation of Cu(OH)2 precipitates.https://doi.org/10.1038/s41598-025-86391-3Layered double hydroxidesSiO2AdsorptionSolid concentration effect |
| spellingShingle | Fengrong Zhang Luxing Liu Cuilan Zhang Dawei Shang Lishun Wu Preparation of ZnAl layered double hydroxides supported by silica for the treatment of Cr(VI) and Cu(II) in aqueous solution Scientific Reports Layered double hydroxides SiO2 Adsorption Solid concentration effect |
| title | Preparation of ZnAl layered double hydroxides supported by silica for the treatment of Cr(VI) and Cu(II) in aqueous solution |
| title_full | Preparation of ZnAl layered double hydroxides supported by silica for the treatment of Cr(VI) and Cu(II) in aqueous solution |
| title_fullStr | Preparation of ZnAl layered double hydroxides supported by silica for the treatment of Cr(VI) and Cu(II) in aqueous solution |
| title_full_unstemmed | Preparation of ZnAl layered double hydroxides supported by silica for the treatment of Cr(VI) and Cu(II) in aqueous solution |
| title_short | Preparation of ZnAl layered double hydroxides supported by silica for the treatment of Cr(VI) and Cu(II) in aqueous solution |
| title_sort | preparation of znal layered double hydroxides supported by silica for the treatment of cr vi and cu ii in aqueous solution |
| topic | Layered double hydroxides SiO2 Adsorption Solid concentration effect |
| url | https://doi.org/10.1038/s41598-025-86391-3 |
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