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Spray coating of adsorbent with polymer latex on sand particles for fluoride removal in drinking water / Hai-Xia Wu in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4697-4702 Titre : Spray coating of adsorbent with polymer latex on sand particles for fluoride removal in drinking water Type de document : texte imprimé Auteurs : Hai-Xia Wu, Auteur ; Ting-Jie Wang, Auteur ; Xiao Min Dou, Auteur ; Bei Zhao, Auteur Année de publication : 2008 Article en page(s) : p. 4697-4702 Note générale : Bibliogr. p. 4702 Langues : Anglais (eng) Mots-clés : Fe-Al-Ce  adsorbent;  Polymer  latex;  Spray  coating Résumé : An iron-aluminum-cerium trimetal hydroxide (Fe-Al-Ce) adsorbent with an acrylic-styrene copolymer latex binder, which can cross-link and cure at room temperature, was coated on sand particles by spray coating. The adhesion of the coated layer increased with the latex/Fe-Al-Ce ratio. A suitable latex/Fe-Al-Ce ratio and thickness of coated adsorbent were determined to be 0.8 and 70 μm, respectively, giving good stability and adsorption capacity. The corresponding adsorption capacity of fluoride ions on the coated sand reached 3.46 mg/g at pH 7.0 and an initial fluoride concentration of 50 mg/L. Sand coated with Fe−Al−Ce is a potential adsorbent for use in a packed bed for fluoride removal from drinking water. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800278b [article] Spray coating of adsorbent with polymer latex on sand particles for fluoride removal in drinking water [texte imprimé] / Hai-Xia Wu, Auteur ; Ting-Jie Wang, Auteur ; Xiao Min Dou, Auteur ; Bei Zhao, Auteur . - 2008 . - p. 4697-4702. Bibliogr. p. 4702 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4697-4702 Mots-clés : Fe-Al-Ce  adsorbent;  Polymer  latex;  Spray  coating Résumé : An iron-aluminum-cerium trimetal hydroxide (Fe-Al-Ce) adsorbent with an acrylic-styrene copolymer latex binder, which can cross-link and cure at room temperature, was coated on sand particles by spray coating. The adhesion of the coated layer increased with the latex/Fe-Al-Ce ratio. A suitable latex/Fe-Al-Ce ratio and thickness of coated adsorbent were determined to be 0.8 and 70 μm, respectively, giving good stability and adsorption capacity. The corresponding adsorption capacity of fluoride ions on the coated sand reached 3.46 mg/g at pH 7.0 and an initial fluoride concentration of 50 mg/L. Sand coated with Fe−Al−Ce is a potential adsorbent for use in a packed bed for fluoride removal from drinking water. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800278b

The roles of the surface charge and hydroxyl group on a Fe−Al−Ce adsorbent in fluoride adsorption / Hai-Xia Wu in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4530–4534 Titre : The roles of the surface charge and hydroxyl group on a Fe−Al−Ce adsorbent in fluoride adsorption Type de document : texte imprimé Auteurs : Hai-Xia Wu, Auteur ; Ting-Jie Wang, Auteur ; Lin Chen, Auteur Année de publication : 2009 Article en page(s) : pp. 4530–4534 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Surface  charge  Hydroxyl  group  Fe−Al−Ce  adsorbent  Fluoride  adsorption  External  voltage Résumé : The roles of the surface charge and hydroxyl group on a Fe−Al−Ce adsorbent in fluoride adsorption were studied. Fluoride adsorption at different initial solution pH was investigated. An external voltage was applied to an adsorbent-coated electrode to examine the adsorption characteristics due to the surface charge. The capability of accepting or providing H+ of the hydroxyl on the adsorbent surface was determined through the titration of NaOH solution, and the change of the hydroxyl before and after adsorption was analyzed by FTIR. Fluoride adsorption was rapid during the initial stage but slowed down later. Fluoride ions were transferred to the adsorbent surface by Coulombic attraction and/or thermal motion, forming a temporary and nonspecific adsorption. The enriched fluoride ions reacted with the hydroxyl groups on the adsorbent surface, forming a stable adsorption. The surface charge on the adsorbent and ion exchange between surface hydroxyl groups and fluoride ions have a large effect on the adsorption rate and efficiency. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800890q [article] The roles of the surface charge and hydroxyl group on a Fe−Al−Ce adsorbent in fluoride adsorption [texte imprimé] / Hai-Xia Wu, Auteur ; Ting-Jie Wang, Auteur ; Lin Chen, Auteur . - 2009 . - pp. 4530–4534. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4530–4534 Mots-clés : Surface  charge  Hydroxyl  group  Fe−Al−Ce  adsorbent  Fluoride  adsorption  External  voltage Résumé : The roles of the surface charge and hydroxyl group on a Fe−Al−Ce adsorbent in fluoride adsorption were studied. Fluoride adsorption at different initial solution pH was investigated. An external voltage was applied to an adsorbent-coated electrode to examine the adsorption characteristics due to the surface charge. The capability of accepting or providing H+ of the hydroxyl on the adsorbent surface was determined through the titration of NaOH solution, and the change of the hydroxyl before and after adsorption was analyzed by FTIR. Fluoride adsorption was rapid during the initial stage but slowed down later. Fluoride ions were transferred to the adsorbent surface by Coulombic attraction and/or thermal motion, forming a temporary and nonspecific adsorption. The enriched fluoride ions reacted with the hydroxyl groups on the adsorbent surface, forming a stable adsorption. The surface charge on the adsorbent and ion exchange between surface hydroxyl groups and fluoride ions have a large effect on the adsorption rate and efficiency. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800890q