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• W3207366985 endingPage "105067" @default.
• W3207366985 startingPage "105067" @default.
• W3207366985 abstract "A high concentrations of fluoride (F - ) in groundwater limits drinking water supplies and results in fluorosis for hundreds of millions of people globally. A novel F - selective adsorbent (HCIX-Al) with a closed-loop regeneration system was developed, characterized, and assessed for its effectiveness in F - removal using both synthetic and natural groundwater. The system used an inexpensive polymeric macroporous cation exchanger doped with hydrous aluminum oxide (HAlO) nanoparticles. The HAlO nanoparticles were loaded into the matrix of the polymer phase by ion-exchange reactions between Al 3+ and Ca 2+ ions that bind with sulfonic acid functional groups of the cation exchangers. Hydrogen ions were generated in-situ during the HAlO formation process, creating acidic conditions inside the polymeric phase, which significantly increased F - sorption capacity (maximum sorption capacity = 5.75 mg/g at pH 7.5). While most other aluminum oxide-based F - selective sorbents suffer from low F - removal capacity at neutral to alkaline pH of typical groundwater, the HCIX-Al exhibited high F - sorption capacity even using alkaline (pH 8.5) groundwater. The treated water had a pH greater than 6.5 and non-detectable levels of aluminum (detection limit 0.002 mg/L), which complies with drinking water regulations. The HCIX-Al material can be reused by conditioning the exhausted material with a closed-loop regeneration chemical containing a recyclable 12% AlCl 3 solution. The F - was precipitated from the regeneration system as CaF 2 using lime at pH 11. This material, including a novel regeneration scheme, offered high F - removal capacity, cost-effectiveness, and provided a sustainable defluoridation process. • The fluoride-selective hybrid nano-adsorbent, HCIX-Al, were firstly synthesized. • High F - sorption capacity can be achieved even at mildly alkaline groundwater. • Cation exchanger was used as support with an insignificant Donnan membrane effect. • Cost-effective closed-loop recyclable regenerant solution was proposed. • The HCIX-Al was extensively validated using both synthetic and field test water." @default.
• W3207366985 created "2021-10-25" @default.
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• W3207366985 date "2021-10-01" @default.
• W3207366985 modified "2023-10-16" @default.
• W3207366985 title "Fluoride removal by hybrid cation exchanger impregnated with hydrated Al(III) oxide nanoparticles (HCIX-Al) with novel closed-loop recyclable regeneration system" @default.
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• W3207366985 doi "https://doi.org/10.1016/j.reactfunctpolym.2021.105067" @default.
• W3207366985 hasPublicationYear "2021" @default.
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