Fluoride removal from water using bio - char, a green waste, low - cost adsorbent / Dinesh Mohan in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 900-914 Titre : Fluoride removal from water using bio - char, a green waste, low - cost adsorbent : Equilibrium uptake and sorption dynamics modeling Type de document : texte imprimé Auteurs : Dinesh Mohan, Auteur ; Rupa Sharma, Auteur ; Vinod K. Singh, Auteur Année de publication : 2012 Article en page(s) : pp. 900-914 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Modeling Dynamic model Sorption Uptake Résumé : Drinking water containing fluoride > 1 mg/L is unsafe for human consumption. Higher intake of fluoride can cause potential health hazards. Low-cost pine wood and pine bark chars, obtained as a byproduct from fast pyrolysis in an auger reactor at 400 and 450 °C, were characterized and used as received for water defluoridation. Sorption studies were performed at different temperatures, pH values, and solid to liquid ratios in the batch mode. Maximum fluoride adsorption occurred at pH 2.0. A kinetic study yielded an optimum equilibrium time of 48 h with an adsorbent dose of 10 g/L. Sorption isotherm studies were conducted over a concentration range of 1-100 mg/L. Fluoride adsorption decreased with an increase in temperature. The char performances were evaluated using the Freundlich, Langmuir, Redlich―Peterson, Toth, Temldn, Sips, and Radke adsorption models. Based on average percent error, the best isotherm fits follow the orders for pine wood and pine bark: PWLangmuir ≈ PWRedlich-Peterson > PWToth > PWSips > PWRadke-Prusnitz ≈ PWFreundlich > PWTemkin and PBToth > PBRadke-Prausnitz ≈PBFreundlich > PBRedlich-Peterson > PBLangmuir > PBSips > PBTemkin. The pine chars successfully treated fluoride-contaminated groundwater at pH 2.0. The chars swelled in water due to their high oxygen content (8―11%), opening new internal pore volume. Fluoride could also diffuse into portions of the chars'subsurface solid volume promoting further adsorption. Ion exchange and metal fluoride precipitation are modes of adsorption. Remarkably, these chars (SBET: 1―3 m2g―1) can remove similar amounts or more fluoride than activated carbon (SBET: ∼1000 m2g―1). DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476423 [article] Fluoride removal from water using bio - char, a green waste, low - cost adsorbent : Equilibrium uptake and sorption dynamics modeling [texte imprimé] / Dinesh Mohan, Auteur ; Rupa Sharma, Auteur ; Vinod K. Singh, Auteur . - 2012 . - pp. 900-914. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 900-914 Mots-clés : Modeling Dynamic model Sorption Uptake Résumé : Drinking water containing fluoride > 1 mg/L is unsafe for human consumption. Higher intake of fluoride can cause potential health hazards. Low-cost pine wood and pine bark chars, obtained as a byproduct from fast pyrolysis in an auger reactor at 400 and 450 °C, were characterized and used as received for water defluoridation. Sorption studies were performed at different temperatures, pH values, and solid to liquid ratios in the batch mode. Maximum fluoride adsorption occurred at pH 2.0. A kinetic study yielded an optimum equilibrium time of 48 h with an adsorbent dose of 10 g/L. Sorption isotherm studies were conducted over a concentration range of 1-100 mg/L. Fluoride adsorption decreased with an increase in temperature. The char performances were evaluated using the Freundlich, Langmuir, Redlich―Peterson, Toth, Temldn, Sips, and Radke adsorption models. Based on average percent error, the best isotherm fits follow the orders for pine wood and pine bark: PWLangmuir ≈ PWRedlich-Peterson > PWToth > PWSips > PWRadke-Prusnitz ≈ PWFreundlich > PWTemkin and PBToth > PBRadke-Prausnitz ≈PBFreundlich > PBRedlich-Peterson > PBLangmuir > PBSips > PBTemkin. The pine chars successfully treated fluoride-contaminated groundwater at pH 2.0. The chars swelled in water due to their high oxygen content (8―11%), opening new internal pore volume. Fluoride could also diffuse into portions of the chars'subsurface solid volume promoting further adsorption. Ion exchange and metal fluoride precipitation are modes of adsorption. Remarkably, these chars (SBET: 1―3 m2g―1) can remove similar amounts or more fluoride than activated carbon (SBET: ∼1000 m2g―1). DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476423

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