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Intercalation of gastropod shell derived calcium oxide in clay and application in phosphate removal from aqua medium / N. A. Oladoja in Industrial & engineering chemistry research, Vol. 51 N° 45 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp. 14637-14645 Titre : Intercalation of gastropod shell derived calcium oxide in clay and application in phosphate removal from aqua medium Type de document : texte imprimé Auteurs : N. A. Oladoja, Auteur ; C. O. Aboluwoye, Auteur ; I. A. Ololade, Auteur Année de publication : 2013 Article en page(s) : pp. 14637-14645 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Gastropod Résumé : The phosphate sorption potential of the layered framework of naturally occurring clay, which acts as a host in the sorption process, was boosted via intercalation of CaO derived from a Gastropod shell (GS). GS was used as precursor for the synthesis of the CaO in the perspective of waste recycling and cost minimization in environmental remediation. The phosphate sorption potential, PZC, and the surface area of raw clay sample were substantially enhanced by the intercalation process. The value of the Langmuir monolayer sorption capacity (qm mg/g) increased from 49.02 to 71.43, PZC values increased from 4.70 to 7.20, and the surface area (m2/g) value increased from 23 to 103 after the intercalation process. The modification caused no change in the clay surficial microstructure but increased the lattice spacing of the clay framework. Increase in phosphate solution pH triggered monotonical reduction in the magnitude of phosphate sorbed while increase in phosphate solution ionic strength and concentration of anionic interferences caused an increase in the amount of phosphate sorbed per gram of sorbent. Phosphate sorption caused no change in the surficial microstructure of either sorbents but the crystallinity of the sorbent was considerably impacted, especially in the raw sample. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301520v [article] Intercalation of gastropod shell derived calcium oxide in clay and application in phosphate removal from aqua medium [texte imprimé] / N. A. Oladoja, Auteur ; C. O. Aboluwoye, Auteur ; I. A. Ololade, Auteur . - 2013 . - pp. 14637-14645. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp. 14637-14645 Mots-clés : Gastropod Résumé : The phosphate sorption potential of the layered framework of naturally occurring clay, which acts as a host in the sorption process, was boosted via intercalation of CaO derived from a Gastropod shell (GS). GS was used as precursor for the synthesis of the CaO in the perspective of waste recycling and cost minimization in environmental remediation. The phosphate sorption potential, PZC, and the surface area of raw clay sample were substantially enhanced by the intercalation process. The value of the Langmuir monolayer sorption capacity (qm mg/g) increased from 49.02 to 71.43, PZC values increased from 4.70 to 7.20, and the surface area (m2/g) value increased from 23 to 103 after the intercalation process. The modification caused no change in the clay surficial microstructure but increased the lattice spacing of the clay framework. Increase in phosphate solution pH triggered monotonical reduction in the magnitude of phosphate sorbed while increase in phosphate solution ionic strength and concentration of anionic interferences caused an increase in the amount of phosphate sorbed per gram of sorbent. Phosphate sorption caused no change in the surficial microstructure of either sorbents but the crystallinity of the sorbent was considerably impacted, especially in the raw sample. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301520v

Synthesis of nano calcium oxide from a gastropod shell and the performance evaluation for Cr (VI) removal from aqua system / N. A. Oladoja in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 639-648 Titre : Synthesis of nano calcium oxide from a gastropod shell and the performance evaluation for Cr (VI) removal from aqua system Type de document : texte imprimé Auteurs : N. A. Oladoja, Auteur ; I. A. Ololade, Auteur ; S.E. Olaseni, Auteur Année de publication : 2012 Article en page(s) : pp. 639-648 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Porous  nano  Calcium  oxide Résumé : A spongy, porous nano calcium oxide (NC) with point zero charge of 11.80 was synthesized using the shell of a Gastropod (Achatina achatina) via the sol–gel technique. The ability of the NC to adsorb Cr (VI) from aqueous solution was assessed systematically in a batch process via isothermal, kinetic, and variable process optimization procedure. The sorption data had the best fitting for the Langmuir isotherm model and the monolayer sorption capacity (qm, mg/g) value of 125 mg/g was obtained. The initial solution pH had no palpable effect on the monolayer sorption capacity. The amount of sorbed Cr (VI) increased with contact time and initial Cr (VI) concentration and attained equilibrium within 120 min. The fitting of the different kinetic models to the sorption data, by error analysis, using the linear coefficient determinations (r2) and the Chi-square statistical analysis (χ2), showed that the mechanism of the sorption process is better described by the pseudo second order kinetic model. Thermodynamic evaluation showed that the sorption process was spontaneous (ΔGo: −15.27; −14.87 and −14.45 kJ/mol at 303, 313, and 333 °C, respectively), exothermic (ΔH0 = −22.568 kJ/mol) and increased disorder (ΔS0 = 0.0244) appeared on the NC–solution interface during the adsorption process. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201189z [article] Synthesis of nano calcium oxide from a gastropod shell and the performance evaluation for Cr (VI) removal from aqua system [texte imprimé] / N. A. Oladoja, Auteur ; I. A. Ololade, Auteur ; S.E. Olaseni, Auteur . - 2012 . - pp. 639-648. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 639-648 Mots-clés : Porous  nano  Calcium  oxide Résumé : A spongy, porous nano calcium oxide (NC) with point zero charge of 11.80 was synthesized using the shell of a Gastropod (Achatina achatina) via the sol–gel technique. The ability of the NC to adsorb Cr (VI) from aqueous solution was assessed systematically in a batch process via isothermal, kinetic, and variable process optimization procedure. The sorption data had the best fitting for the Langmuir isotherm model and the monolayer sorption capacity (qm, mg/g) value of 125 mg/g was obtained. The initial solution pH had no palpable effect on the monolayer sorption capacity. The amount of sorbed Cr (VI) increased with contact time and initial Cr (VI) concentration and attained equilibrium within 120 min. The fitting of the different kinetic models to the sorption data, by error analysis, using the linear coefficient determinations (r2) and the Chi-square statistical analysis (χ2), showed that the mechanism of the sorption process is better described by the pseudo second order kinetic model. Thermodynamic evaluation showed that the sorption process was spontaneous (ΔGo: −15.27; −14.87 and −14.45 kJ/mol at 303, 313, and 333 °C, respectively), exothermic (ΔH0 = −22.568 kJ/mol) and increased disorder (ΔS0 = 0.0244) appeared on the NC–solution interface during the adsorption process. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201189z