Innovative Use of Wood Ash for Fluoride Removal from Water: Comprehensive Experiments and Mechanism Insight
This study investigates the potential of wood ash (WA), a by-product of wood-based energy production, as an eco-friendly alternative for removing fluoride from water. Kinetic analysis revealed that WA enables rapid fluoride removal, reaching equilibrium within 1 h (112.09 ± 3.9 mg/g). Equilibrium an...
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2024-12-01
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| author | Jae-In Lee Jin-Kyu Kang Sanghyun Jeong Chang-Gu Lee Joon-Weon Choi Seong-Jik Park |
| author_facet | Jae-In Lee Jin-Kyu Kang Sanghyun Jeong Chang-Gu Lee Joon-Weon Choi Seong-Jik Park |
| author_sort | Jae-In Lee |
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| description | This study investigates the potential of wood ash (WA), a by-product of wood-based energy production, as an eco-friendly alternative for removing fluoride from water. Kinetic analysis revealed that WA enables rapid fluoride removal, reaching equilibrium within 1 h (112.09 ± 3.9 mg/g). Equilibrium analysis demonstrated that WA exhibits a Langmuir maximum capacity of 157.34 mg/g, indicating a high adsorption capacity that ranks within the top 10% of reported adsorbents (34th out of 328). According to thermodynamic analysis, the adsorption process appears to be both endothermic and spontaneous at elevated temperatures. pH dependence studies showed that while the fluoride adsorption capacity of WA peaked under acidic conditions, it remained relatively stable (116.01 ± 0.8 mg/g) over a wide range of pH levels (5 to 11). An optimal dosage of 6.67 g/L achieved a greater than 98% fluoride removal rate. Coexisting anions affected the fluoride adsorption capacity of WA, with the order of influence being PO<sub>4</sub><sup>3−</sup> > CO<sub>3</sub><sup>2−</sup> >> SO<sub>4</sub><sup>2−</sup> > NO<sub>3</sub><sup>−</sup> ≈ Cl<sup>−</sup>. Mechanistic analyses confirmed the surface precipitation of CaF<sub>2</sub> as the primary mechanism responsible for fluoride removal. With a Ca content of over 66 wt.%, WA facilitates enhanced fluoride removal. Overall, this study highlights the efficacy of WA as a sustainable adsorbent for the removal of fluoride from water, contributing to the valorization of WA in wastewater treatment applications. |
| format | Article |
| id | doaj-art-4c343251777d4b699e232952fe40f529 |
| institution | Kabale University |
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| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj-art-4c343251777d4b699e232952fe40f5292025-01-10T13:14:55ZengMDPI AGApplied Sciences2076-34172024-12-0115124510.3390/app15010245Innovative Use of Wood Ash for Fluoride Removal from Water: Comprehensive Experiments and Mechanism InsightJae-In Lee0Jin-Kyu Kang1Sanghyun Jeong2Chang-Gu Lee3Joon-Weon Choi4Seong-Jik Park5Institute of Agricultural Environmental Science, Hankyong National University, Anseong 17579, Republic of KoreaDepartment of Marine Environmental Engineering, Gyeongsang National University, Tongyeong 53064, Republic of KoreaCivil and Environmental Engineering, Pusan National University, Pusan 46241, Republic of KoreaDepartment of Environmental and Safety Engineering & Energy Systems Research, Ajou University, Suwon 16499, Republic of KoreaInstitute of Green Bio Science and Technology, Seoul National University, Pyeongchang 25354, Republic of KoreaInstitute of Agricultural Environmental Science, Hankyong National University, Anseong 17579, Republic of KoreaThis study investigates the potential of wood ash (WA), a by-product of wood-based energy production, as an eco-friendly alternative for removing fluoride from water. Kinetic analysis revealed that WA enables rapid fluoride removal, reaching equilibrium within 1 h (112.09 ± 3.9 mg/g). Equilibrium analysis demonstrated that WA exhibits a Langmuir maximum capacity of 157.34 mg/g, indicating a high adsorption capacity that ranks within the top 10% of reported adsorbents (34th out of 328). According to thermodynamic analysis, the adsorption process appears to be both endothermic and spontaneous at elevated temperatures. pH dependence studies showed that while the fluoride adsorption capacity of WA peaked under acidic conditions, it remained relatively stable (116.01 ± 0.8 mg/g) over a wide range of pH levels (5 to 11). An optimal dosage of 6.67 g/L achieved a greater than 98% fluoride removal rate. Coexisting anions affected the fluoride adsorption capacity of WA, with the order of influence being PO<sub>4</sub><sup>3−</sup> > CO<sub>3</sub><sup>2−</sup> >> SO<sub>4</sub><sup>2−</sup> > NO<sub>3</sub><sup>−</sup> ≈ Cl<sup>−</sup>. Mechanistic analyses confirmed the surface precipitation of CaF<sub>2</sub> as the primary mechanism responsible for fluoride removal. With a Ca content of over 66 wt.%, WA facilitates enhanced fluoride removal. Overall, this study highlights the efficacy of WA as a sustainable adsorbent for the removal of fluoride from water, contributing to the valorization of WA in wastewater treatment applications.https://www.mdpi.com/2076-3417/15/1/245energy byproductsfluoridewood ashfluoritegreen adsorbent |
| spellingShingle | Jae-In Lee Jin-Kyu Kang Sanghyun Jeong Chang-Gu Lee Joon-Weon Choi Seong-Jik Park Innovative Use of Wood Ash for Fluoride Removal from Water: Comprehensive Experiments and Mechanism Insight Applied Sciences energy byproducts fluoride wood ash fluorite green adsorbent |
| title | Innovative Use of Wood Ash for Fluoride Removal from Water: Comprehensive Experiments and Mechanism Insight |
| title_full | Innovative Use of Wood Ash for Fluoride Removal from Water: Comprehensive Experiments and Mechanism Insight |
| title_fullStr | Innovative Use of Wood Ash for Fluoride Removal from Water: Comprehensive Experiments and Mechanism Insight |
| title_full_unstemmed | Innovative Use of Wood Ash for Fluoride Removal from Water: Comprehensive Experiments and Mechanism Insight |
| title_short | Innovative Use of Wood Ash for Fluoride Removal from Water: Comprehensive Experiments and Mechanism Insight |
| title_sort | innovative use of wood ash for fluoride removal from water comprehensive experiments and mechanism insight |
| topic | energy byproducts fluoride wood ash fluorite green adsorbent |
| url | https://www.mdpi.com/2076-3417/15/1/245 |
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