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Magnetic molecularly imprinted polymers based on attapulgite / Fe3O4 particles for the selective recognition of 2,4 - dichlorophenol / Jianming Pan in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.68-75 Titre : Magnetic molecularly imprinted polymers based on attapulgite / Fe3O4 particles for the selective recognition of 2,4 - dichlorophenol Type de document : texte imprimé Auteurs : Jianming Pan, Auteur ; Longcheng Xu, Auteur ; Jiangdong Dai, Auteur Année de publication : 2012 Article en page(s) : pp.68-75 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Surface  imprinted  polymers  Selective  recognition  2,4-Dichlorophenol  Attapulgite  /Fe3O4  magnetic  particles  Magnetic  susceptibility Résumé : Via encapsulation of attapulgite/Fe3O4magneticparticles (ATP/Fe3O4), the magneticmolecularlyimprintedpolymers (MMIPs) were synthesized for the selective recognition of 2,4-dichlorophenol (2,4-DCP). MMIPs were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) analysis, thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM), nitrogen adsorption–desorption analysis and Raman spectroscopy. MMIPs were demonstrated claviform shape with an imprintedpolymer film (thickness of about 16 nm), and exhibited magnetic property (Ms = 5.67 emu g−1) and thermal stability. Batch mode adsorption studies were carried out to investigate the specific binding capacity, binding kinetics and recognition specificity. The Langmuir isotherm model was fitted to the equilibrium data better than the other models, and the monolayer adsorption capacity of MMIPs were 145.79 mg g−1 at 298 K. The kinetic properties of MMIPs were well described by the pseudo-second-order equation, initial adsorption rate and half-adsorption time. The selective recognition experiments demonstrated high affinity and selectivity towards 2,4-DCP over structurally related phenolic compounds. In addition, MMIPs could be regenerated, and their adsorption capacity in the fifth use was about 7.53% loss in 2,4-DCP solution. The MMIPs as-prepared were successfully applied to the separation of 2,4-DCP from environmental water samples. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711009922 [article] Magnetic molecularly imprinted polymers based on attapulgite / Fe3O4 particles for the selective recognition of 2,4 - dichlorophenol [texte imprimé] / Jianming Pan, Auteur ; Longcheng Xu, Auteur ; Jiangdong Dai, Auteur . - 2012 . - pp.68-75. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.68-75 Mots-clés : Surface  imprinted  polymers  Selective  recognition  2,4-Dichlorophenol  Attapulgite  /Fe3O4  magnetic  particles  Magnetic  susceptibility Résumé : Via encapsulation of attapulgite/Fe3O4magneticparticles (ATP/Fe3O4), the magneticmolecularlyimprintedpolymers (MMIPs) were synthesized for the selective recognition of 2,4-dichlorophenol (2,4-DCP). MMIPs were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) analysis, thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM), nitrogen adsorption–desorption analysis and Raman spectroscopy. MMIPs were demonstrated claviform shape with an imprintedpolymer film (thickness of about 16 nm), and exhibited magnetic property (Ms = 5.67 emu g−1) and thermal stability. Batch mode adsorption studies were carried out to investigate the specific binding capacity, binding kinetics and recognition specificity. The Langmuir isotherm model was fitted to the equilibrium data better than the other models, and the monolayer adsorption capacity of MMIPs were 145.79 mg g−1 at 298 K. The kinetic properties of MMIPs were well described by the pseudo-second-order equation, initial adsorption rate and half-adsorption time. The selective recognition experiments demonstrated high affinity and selectivity towards 2,4-DCP over structurally related phenolic compounds. In addition, MMIPs could be regenerated, and their adsorption capacity in the fifth use was about 7.53% loss in 2,4-DCP solution. The MMIPs as-prepared were successfully applied to the separation of 2,4-DCP from environmental water samples. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711009922

Performance of rattle - type magnetic mesoporous silica spheres in the adsorption of single and binary antibiotics / Longcheng Xu in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.221–230 Titre : Performance of rattle - type magnetic mesoporous silica spheres in the adsorption of single and binary antibiotics Type de document : texte imprimé Auteurs : Longcheng Xu, Auteur ; Jiangdong Dai, Auteur ; Jiangming Pan, Auteur Année de publication : 2012 Article en page(s) : pp.221–230 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : y-Fe2O3/mSiO2  spheres  Tetracycline  Sulfamethazine  Adsorption Résumé : The rattle-type γ-Fe2O3/mesoporous silica spheres (γ-Fe2O3/mSiO2 spheres) were synthesized with a facial and selectively etching strategy. The prepared particles were characterized by FT-IR, XRD, TEM, SEM, VSM, Raman spectroscopy and nitrogen adsorption–desorption analysis, and the results indicated that γ-Fe2O3/mSiO2 spheres exhibited magnetic property (Ms = 14.43 emu g−1) and composed of mesoporous silica (mean diameter, thickness and pore size was 660 nm, 60 nm, and 2.29 nm, respectively). Then the γ-Fe2O3/mSiO2 spheres were employed as sorbents to remove tetracycline (TC) and sulfamethazine (SMZ) in both single and binary aqueous solutions. The adsorption kinetics of γ-Fe2O3/mSiO2 spheres were well-described by the pseudo-second-order equation, initial adsorption rate, and half-adsorption time. The Langmuir isotherm model was fitted to the equilibrium data better than that for Freundlich model, and the monolayer adsorption capacity of γ-Fe2O3/mSiO2 spheres for TC and SMZ were 0.0791 mmol g−1 and 0.0342 mmol g−1 at 298 K, respectively. In binary systems, SMZ adsorption onto γ-Fe2O3/mSiO2 spheres was more affected by the simultaneous presence of competitive antibiotics than that for TC. In addition, the reusability of the material without obviously deterioration in performance was observed at least four repealed cycles. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010618 [article] Performance of rattle - type magnetic mesoporous silica spheres in the adsorption of single and binary antibiotics [texte imprimé] / Longcheng Xu, Auteur ; Jiangdong Dai, Auteur ; Jiangming Pan, Auteur . - 2012 . - pp.221–230. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.221–230 Mots-clés : y-Fe2O3/mSiO2  spheres  Tetracycline  Sulfamethazine  Adsorption Résumé : The rattle-type γ-Fe2O3/mesoporous silica spheres (γ-Fe2O3/mSiO2 spheres) were synthesized with a facial and selectively etching strategy. The prepared particles were characterized by FT-IR, XRD, TEM, SEM, VSM, Raman spectroscopy and nitrogen adsorption–desorption analysis, and the results indicated that γ-Fe2O3/mSiO2 spheres exhibited magnetic property (Ms = 14.43 emu g−1) and composed of mesoporous silica (mean diameter, thickness and pore size was 660 nm, 60 nm, and 2.29 nm, respectively). Then the γ-Fe2O3/mSiO2 spheres were employed as sorbents to remove tetracycline (TC) and sulfamethazine (SMZ) in both single and binary aqueous solutions. The adsorption kinetics of γ-Fe2O3/mSiO2 spheres were well-described by the pseudo-second-order equation, initial adsorption rate, and half-adsorption time. The Langmuir isotherm model was fitted to the equilibrium data better than that for Freundlich model, and the monolayer adsorption capacity of γ-Fe2O3/mSiO2 spheres for TC and SMZ were 0.0791 mmol g−1 and 0.0342 mmol g−1 at 298 K, respectively. In binary systems, SMZ adsorption onto γ-Fe2O3/mSiO2 spheres was more affected by the simultaneous presence of competitive antibiotics than that for TC. In addition, the reusability of the material without obviously deterioration in performance was observed at least four repealed cycles. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010618