Defluoridation performance comparison of aluminum hydroxides with different crystalline phases
Aluminum hydroxide is an eye-catching and extensively researched adsorbent for fluoride removal and its defluoridation performance is closely related to the preparation method and crystalline phase. In this research, the defluoridation performances of aluminum hydroxides with different crystalline p...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IWA Publishing
2022-04-01
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| Series: | Water Supply |
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| Online Access: | http://ws.iwaponline.com/content/22/4/3673 |
| _version_ | 1817983560201535488 |
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| author | Wei-Zhuo Gai Shi-Hu Zhang Yang Yang Kexi Sun Hong Jia Zhen-Yan Deng |
| author_facet | Wei-Zhuo Gai Shi-Hu Zhang Yang Yang Kexi Sun Hong Jia Zhen-Yan Deng |
| author_sort | Wei-Zhuo Gai |
| collection | DOAJ |
| description | Aluminum hydroxide is an eye-catching and extensively researched adsorbent for fluoride removal and its defluoridation performance is closely related to the preparation method and crystalline phase. In this research, the defluoridation performances of aluminum hydroxides with different crystalline phases are compared and evaluated in terms of fluoride removal capacity, sensitivity to pH values and residual Al contents after defluoridation. It is found that the defluoridation performance of different aluminum hydroxides follows the order of boehmite > bayerite > gibbsite. The fluoride adsorption on aluminum hydroxides follows the pseudo-second-order kinetic model and Langmuir isotherm model, and the maximum defluoridation capacities of boehmite, bayerite and gibbsite are 42.08, 2.97 and 2.74 mg m−2, respectively. The pH values and FTIR analyses reveal that the ligand exchange between fluoride and surface hydroxyl groups is the fluoride removal mechanism. Different aluminum hydroxides have different surface hydroxyl group densities, which results in the different defluoridation capacities. This work provides a new idea to prepare aluminum hydroxide with outstanding defluoridation performance. HIGHLIGHTS
The defluoridation performance of boehmite, bayerite and gibbsite is compared.;
Boehmite exhibits better defluoridation performance than bayerite and gibbsite.;
Fluoride removal mechanism was revealed through pH value and FTIR analyses.;
Adsorption capacity of aluminum hydroxide depends on surface hydroxyl group density.; |
| first_indexed | 2024-04-13T23:34:37Z |
| format | Article |
| id | doaj.art-bdf97749509b4addbfef046d61a6249d |
| institution | Directory Open Access Journal |
| issn | 1606-9749 1607-0798 |
| language | English |
| last_indexed | 2024-04-13T23:34:37Z |
| publishDate | 2022-04-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Supply |
| spelling | doaj.art-bdf97749509b4addbfef046d61a6249d2022-12-22T02:24:47ZengIWA PublishingWater Supply1606-97491607-07982022-04-012243673368410.2166/ws.2022.012012Defluoridation performance comparison of aluminum hydroxides with different crystalline phasesWei-Zhuo Gai0Shi-Hu Zhang1Yang Yang2Kexi Sun3Hong Jia4Zhen-Yan Deng5 College of Physics and Electronic Information & Henan Key Laboratory of Electromagnetic Transformation and Detection, Luoyang Normal University, Luoyang 471934, China College of Physics and Electronic Information & Henan Key Laboratory of Electromagnetic Transformation and Detection, Luoyang Normal University, Luoyang 471934, China Energy Materials & Physics Group, Department of Physics, Shanghai University, Shanghai 200444, China College of Physics and Electronic Information & Henan Key Laboratory of Electromagnetic Transformation and Detection, Luoyang Normal University, Luoyang 471934, China College of Physics and Electronic Information & Henan Key Laboratory of Electromagnetic Transformation and Detection, Luoyang Normal University, Luoyang 471934, China Energy Materials & Physics Group, Department of Physics, Shanghai University, Shanghai 200444, China Aluminum hydroxide is an eye-catching and extensively researched adsorbent for fluoride removal and its defluoridation performance is closely related to the preparation method and crystalline phase. In this research, the defluoridation performances of aluminum hydroxides with different crystalline phases are compared and evaluated in terms of fluoride removal capacity, sensitivity to pH values and residual Al contents after defluoridation. It is found that the defluoridation performance of different aluminum hydroxides follows the order of boehmite > bayerite > gibbsite. The fluoride adsorption on aluminum hydroxides follows the pseudo-second-order kinetic model and Langmuir isotherm model, and the maximum defluoridation capacities of boehmite, bayerite and gibbsite are 42.08, 2.97 and 2.74 mg m−2, respectively. The pH values and FTIR analyses reveal that the ligand exchange between fluoride and surface hydroxyl groups is the fluoride removal mechanism. Different aluminum hydroxides have different surface hydroxyl group densities, which results in the different defluoridation capacities. This work provides a new idea to prepare aluminum hydroxide with outstanding defluoridation performance. HIGHLIGHTS The defluoridation performance of boehmite, bayerite and gibbsite is compared.; Boehmite exhibits better defluoridation performance than bayerite and gibbsite.; Fluoride removal mechanism was revealed through pH value and FTIR analyses.; Adsorption capacity of aluminum hydroxide depends on surface hydroxyl group density.;http://ws.iwaponline.com/content/22/4/3673adsorptionaluminum hydroxidecrystalline phasefluoride removalsurface hydroxyl group |
| spellingShingle | Wei-Zhuo Gai Shi-Hu Zhang Yang Yang Kexi Sun Hong Jia Zhen-Yan Deng Defluoridation performance comparison of aluminum hydroxides with different crystalline phases Water Supply adsorption aluminum hydroxide crystalline phase fluoride removal surface hydroxyl group |
| title | Defluoridation performance comparison of aluminum hydroxides with different crystalline phases |
| title_full | Defluoridation performance comparison of aluminum hydroxides with different crystalline phases |
| title_fullStr | Defluoridation performance comparison of aluminum hydroxides with different crystalline phases |
| title_full_unstemmed | Defluoridation performance comparison of aluminum hydroxides with different crystalline phases |
| title_short | Defluoridation performance comparison of aluminum hydroxides with different crystalline phases |
| title_sort | defluoridation performance comparison of aluminum hydroxides with different crystalline phases |
| topic | adsorption aluminum hydroxide crystalline phase fluoride removal surface hydroxyl group |
| url | http://ws.iwaponline.com/content/22/4/3673 |
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