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Removal of 2-chlorophenol from aqueous solution by Mg/Al layered double hydroxide (LDH) and modified LDH / Ya Hui Chuang in Industrial & engineering chemistry research, Vol. 47 n°11 (Juin 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3813–3819 Titre : Removal of 2-chlorophenol from aqueous solution by Mg/Al layered double hydroxide (LDH) and modified LDH Type de document : texte imprimé Auteurs : Ya Hui Chuang, Auteur ; Yu Min Tzou, Auteur ; Ming Kuang Wang, Auteur ; Cheng Hua Liu, Auteur Année de publication : 2008 Article en page(s) : p. 3813–3819 Note générale : Bibliogr. p. 3818-3819 Langues : Anglais (eng) Mots-clés : 2-chlorophenol;  Layered  double  hydroxide;  Organic  pollutant;  Sodium  dodecyl  sulfate  intercalated  LDH;  Sorption Résumé : Sorption is a common treatment for removing pollutants from natural environments. Layered double hydroxides (LDHs), which consist of brucite-like positive layers and sodium dodecyl sulfate intercalated with LDH (SDS−LDH), are considered to be potential organic pollutant sorbents. The objectives of this study were (1) to evaluate the impact of removing 2-chlorophenol (2-CP) using Mg3-Al-(NO3) LDH and SDS−LDH and (2) to investigate the removal efficiencies of these two compounds. All fitted sorption data reveal that the second-order model and the Langmuir model best describe the sorption kinetics and isotherms, respectively. By visual MinteqA2 (2000) calculation, the dissociation pKa of 2-CP is 8.56. The experimental results indicate that a high concentration of 2-CP is sorbed by the hydrophilic-hydrophilic physical interaction of LDH when the pH is >8.56; however, the hydrophobic−hydrophobic partition interaction of SDS−LDH is more vital when the pH is <8.56. LDH and SDS−LDH can be removed not only in the ionic form, but also in the molecular form of 2-CP. The efficiencies of LDH and SDS−LDH, in regard to enhancing 2-CP sorption, are strongly dependent on the pH, 2-CP speciation, ionic strength, and metal dissolution. These results are of practical interest, with respect to the selection of sorbents, to optimize aquatic environment remediation technologies. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071508e [article] Removal of 2-chlorophenol from aqueous solution by Mg/Al layered double hydroxide (LDH) and modified LDH [texte imprimé] / Ya Hui Chuang, Auteur ; Yu Min Tzou, Auteur ; Ming Kuang Wang, Auteur ; Cheng Hua Liu, Auteur . - 2008 . - p. 3813–3819. Bibliogr. p. 3818-3819 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3813–3819 Mots-clés : 2-chlorophenol;  Layered  double  hydroxide;  Organic  pollutant;  Sodium  dodecyl  sulfate  intercalated  LDH;  Sorption Résumé : Sorption is a common treatment for removing pollutants from natural environments. Layered double hydroxides (LDHs), which consist of brucite-like positive layers and sodium dodecyl sulfate intercalated with LDH (SDS−LDH), are considered to be potential organic pollutant sorbents. The objectives of this study were (1) to evaluate the impact of removing 2-chlorophenol (2-CP) using Mg3-Al-(NO3) LDH and SDS−LDH and (2) to investigate the removal efficiencies of these two compounds. All fitted sorption data reveal that the second-order model and the Langmuir model best describe the sorption kinetics and isotherms, respectively. By visual MinteqA2 (2000) calculation, the dissociation pKa of 2-CP is 8.56. The experimental results indicate that a high concentration of 2-CP is sorbed by the hydrophilic-hydrophilic physical interaction of LDH when the pH is >8.56; however, the hydrophobic−hydrophobic partition interaction of SDS−LDH is more vital when the pH is <8.56. LDH and SDS−LDH can be removed not only in the ionic form, but also in the molecular form of 2-CP. The efficiencies of LDH and SDS−LDH, in regard to enhancing 2-CP sorption, are strongly dependent on the pH, 2-CP speciation, ionic strength, and metal dissolution. These results are of practical interest, with respect to the selection of sorbents, to optimize aquatic environment remediation technologies. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071508e

Review of recent developments in solid acid, base, and enzyme catalysts (heterogeneous) for biodiesel production via transesterification / Rajabathar Jothiramalingam in Industrial & engineering chemistry research, Vol. 48 N° 13 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6162–6172 Titre : Review of recent developments in solid acid, base, and enzyme catalysts (heterogeneous) for biodiesel production via transesterification Type de document : texte imprimé Auteurs : Rajabathar Jothiramalingam, Auteur ; Ming Kuang Wang, Auteur Année de publication : 2009 Article en page(s) : pp. 6162–6172 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Solid  catalysts  Heterogeneous  catalysis  Biodiesel  production Résumé : Development of new and effective solid catalysts (solid acid base to immobilized enzyme) is necessary for renewable and green energy production. The various choices of heterogeneous solid catalysis were reported recently, and the specific research outcomes of trans-esterification on heterogeneous catalysis are discussed in the present article. The studies on biodiesel production are mainly focused on the following aspects: (i) examining the appropriate oil source, (ii) establishing the adequate alcohol to oil molar ratio, and (iii) evaluating the available solid acid catalysts, solid base catalysts, and lipase immobilized enzyme catalysts. Although homogeneous catalysis are superior in terms of reaction rate compared to heterogeneous catalysis, the focus of research on development of solid catalysts for heterogeneous catalytic transesterification is directed from the point of easy process and possible adoption for large scale production. The scope of this presentation is to examine these aspects in detail and to provide a comprehensive outlook on the aspects mentioned. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801872t [article] Review of recent developments in solid acid, base, and enzyme catalysts (heterogeneous) for biodiesel production via transesterification [texte imprimé] / Rajabathar Jothiramalingam, Auteur ; Ming Kuang Wang, Auteur . - 2009 . - pp. 6162–6172. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6162–6172 Mots-clés : Solid  catalysts  Heterogeneous  catalysis  Biodiesel  production Résumé : Development of new and effective solid catalysts (solid acid base to immobilized enzyme) is necessary for renewable and green energy production. The various choices of heterogeneous solid catalysis were reported recently, and the specific research outcomes of trans-esterification on heterogeneous catalysis are discussed in the present article. The studies on biodiesel production are mainly focused on the following aspects: (i) examining the appropriate oil source, (ii) establishing the adequate alcohol to oil molar ratio, and (iii) evaluating the available solid acid catalysts, solid base catalysts, and lipase immobilized enzyme catalysts. Although homogeneous catalysis are superior in terms of reaction rate compared to heterogeneous catalysis, the focus of research on development of solid catalysts for heterogeneous catalytic transesterification is directed from the point of easy process and possible adoption for large scale production. The scope of this presentation is to examine these aspects in detail and to provide a comprehensive outlook on the aspects mentioned. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801872t