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Antimony(III) adsorption from aqueous solution using raw perlite and Mn - modified perlite / Ahmet Sari in Industrial & engineering chemistry research, Vol. 51 N° 19 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6877–6886 Titre : Antimony(III) adsorption from aqueous solution using raw perlite and Mn - modified perlite : Equilibrium, thermodynamic, and kinetic studies Type de document : texte imprimé Auteurs : Ahmet Sari, Auteur ; Gungor Sahinoglu, Auteur ; Mustafa Tuzen, Auteur Année de publication : 2012 Article en page(s) : pp. 6877–6886 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Adsorption  Aqueous  Solution  Thermodynamic  Kinetic Résumé : In this study, the adsorption potential of expanded perlite (EP) and manganese oxides-modified EP (Mn-MEP) for the removal of Sb(III) from aqueous solution were investigated. The influence of solution pH, adsorbent concentration, contact time and temperature on the Sb(III) adsorption were studied using the batch method. Modification of the surface of EP with 0.18 g of manganese oxide per gram EP showed an increase of 1.6-fold in its surface area. The raw EP and Mn-MEP samples with Sb(III) ions were characterized before and after the adsorption process using FT-IR and SEM analysis techniques. The monolayer adsorption capacity of EP and Mn-MEP for Sb(III) was found to be 54.4 and 76.5 mg g–1 at pH 4, respectively. The mean adsorption energy (6.3 kJ mol–1) calculated from the Dubinin–Radushkevich model indicated that the adsorption of Sb(III) onto Mn-MEP was physically carried out. After 10 times of adsorption/desorption cycles, the reusability of Mn-MEP decreased as slightly as 5% for adsorption and 7% for desorption. The calculated thermodynamic parameters (ΔGo, ΔHo, and ΔSo) showed that the adsorption was feasible, spontaneous, and exothermic. The kinetic parameters revealed that the adsorption of Sb(III) onto Mn-MEP followed well the pseudo-second-order kinetic model. In addition, from a practical viewpoint, Mn-MEP is a promising adsorbent for the removal of Sb(III) from aqueous solutions since it has large surface area, high adsorption capacity, easy availability, low-cost, and good reusability performance. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300243n [article] Antimony(III) adsorption from aqueous solution using raw perlite and Mn - modified perlite : Equilibrium, thermodynamic, and kinetic studies [texte imprimé] / Ahmet Sari, Auteur ; Gungor Sahinoglu, Auteur ; Mustafa Tuzen, Auteur . - 2012 . - pp. 6877–6886. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6877–6886 Mots-clés : Adsorption  Aqueous  Solution  Thermodynamic  Kinetic Résumé : In this study, the adsorption potential of expanded perlite (EP) and manganese oxides-modified EP (Mn-MEP) for the removal of Sb(III) from aqueous solution were investigated. The influence of solution pH, adsorbent concentration, contact time and temperature on the Sb(III) adsorption were studied using the batch method. Modification of the surface of EP with 0.18 g of manganese oxide per gram EP showed an increase of 1.6-fold in its surface area. The raw EP and Mn-MEP samples with Sb(III) ions were characterized before and after the adsorption process using FT-IR and SEM analysis techniques. The monolayer adsorption capacity of EP and Mn-MEP for Sb(III) was found to be 54.4 and 76.5 mg g–1 at pH 4, respectively. The mean adsorption energy (6.3 kJ mol–1) calculated from the Dubinin–Radushkevich model indicated that the adsorption of Sb(III) onto Mn-MEP was physically carried out. After 10 times of adsorption/desorption cycles, the reusability of Mn-MEP decreased as slightly as 5% for adsorption and 7% for desorption. The calculated thermodynamic parameters (ΔGo, ΔHo, and ΔSo) showed that the adsorption was feasible, spontaneous, and exothermic. The kinetic parameters revealed that the adsorption of Sb(III) onto Mn-MEP followed well the pseudo-second-order kinetic model. In addition, from a practical viewpoint, Mn-MEP is a promising adsorbent for the removal of Sb(III) from aqueous solutions since it has large surface area, high adsorption capacity, easy availability, low-cost, and good reusability performance. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300243n

Preparation, characterization and thermal properties of lauric acid/expanded perlite as novel form-stable composite phase change material / Ahmet Sari in Chemical engineering journal, Vol. 155 N° 3 (Decembre 2009) 

Public ISBD [article]  in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 899-904 Titre : Preparation, characterization and thermal properties of lauric acid/expanded perlite as novel form-stable composite phase change material Type de document : texte imprimé Auteurs : Ahmet Sari, Auteur ; Ali Karaipekli, Auteur ; Cemil Alkan, Auteur Année de publication : 2010 Article en page(s) : pp. 899-904 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Lauric  acid  EP  Form-stable  composite  PCM  Thermal  properties Index. décimale : 660 Résumé : This paper mainly includes the preparation of a novel form-stable composite phase change material (PCM) by incorporation of lauric acid (LA) within the expanded perlite (EP), characterization of the composite by SEM and FT-IR techniques and determination of thermal properties and thermal reliability of the composite PCM using DSC analysis. The LA could be retained by 60 wt.% into EP without melted PCM seepage from the composite and therefore, this composite was described as form-stable composite PCM. SEM results showed that the LA confined into porous of EP. FT-IR analysis indicated that the composite formation of porous EP and LA was physical. The melting and freezing temperatures and latent heats of the composite were measured as 44.13 °C and 40.97 °C; 93.36 J/g and 94.87 J/g, respectively, by DSC analysis. Thermal cycling test showed that the form-stable composite PCM has good thermal reliability and chemical stability although it was subjected to 1000 melting/freezing cycling. Besides, thermal conductivity of the composite PCM was increased approximately as 86% by adding 10 wt.% expanded graphite (EG). As a result, this composite PCM could be considered to have good potential for thermal energy storage because of its good thermal energy storage properties, thermal and chemical reliability and thermal conductivity. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X5JSX8-1&_user=6 [...] [article] Preparation, characterization and thermal properties of lauric acid/expanded perlite as novel form-stable composite phase change material [texte imprimé] / Ahmet Sari, Auteur ; Ali Karaipekli, Auteur ; Cemil Alkan, Auteur . - 2010 . - pp. 899-904. Génie Chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 899-904 Mots-clés : Lauric  acid  EP  Form-stable  composite  PCM  Thermal  properties Index. décimale : 660 Résumé : This paper mainly includes the preparation of a novel form-stable composite phase change material (PCM) by incorporation of lauric acid (LA) within the expanded perlite (EP), characterization of the composite by SEM and FT-IR techniques and determination of thermal properties and thermal reliability of the composite PCM using DSC analysis. The LA could be retained by 60 wt.% into EP without melted PCM seepage from the composite and therefore, this composite was described as form-stable composite PCM. SEM results showed that the LA confined into porous of EP. FT-IR analysis indicated that the composite formation of porous EP and LA was physical. The melting and freezing temperatures and latent heats of the composite were measured as 44.13 °C and 40.97 °C; 93.36 J/g and 94.87 J/g, respectively, by DSC analysis. Thermal cycling test showed that the form-stable composite PCM has good thermal reliability and chemical stability although it was subjected to 1000 melting/freezing cycling. Besides, thermal conductivity of the composite PCM was increased approximately as 86% by adding 10 wt.% expanded graphite (EG). As a result, this composite PCM could be considered to have good potential for thermal energy storage because of its good thermal energy storage properties, thermal and chemical reliability and thermal conductivity. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X5JSX8-1&_user=6 [...]