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Synthesis of bimodal porous titania beads and their potential in liquid chromatography / Kai-Feng Du in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6101-6108 Titre : Synthesis of bimodal porous titania beads and their potential in liquid chromatography Type de document : texte imprimé Auteurs : Kai-Feng Du, Auteur ; Min Yan, Auteur ; Hang Song, Auteur Année de publication : 2011 Article en page(s) : pp. 6101-6108 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Liquid  chromatography Résumé : Bimodal porous titania beads were synthesized from titania nanocrystals of about 34 nm by a method that combines particles agglomeration and sol-gel templating process. The structure properties of porous titania beads were investigated, and the results indicated that the porous titania beads in size of about 15 μm are pure anatase phase and featured by two types of pores with macropores centered at about 200 nm and mesopores smaller than 10 nm. The bimodal pore structure is attributed to hard aggregates of titania particles with different size. In particular, the larger titania nanocrystals agglomerate into macropores and the smaller ones from crystal growth of coated titania into mesopores. Finally, after cation modification, the bimodal porous adsorbents (BPA) were evaluated for investigating chromatographic performance and compared to microporous ones (MPA). It was observed that static and dynamic adsorption capacities of cytochrome C on BPA are both larger than that on MPA. Moreover, the BPApacked column shows better column efficiency than the MPA packed one in test flow rates. Therefore, we demonstrated that the BPA occupies more advantages over the other one and is expected for potential application in chromatography. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158908 [article] Synthesis of bimodal porous titania beads and their potential in liquid chromatography [texte imprimé] / Kai-Feng Du, Auteur ; Min Yan, Auteur ; Hang Song, Auteur . - 2011 . - pp. 6101-6108. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6101-6108 Mots-clés : Liquid  chromatography Résumé : Bimodal porous titania beads were synthesized from titania nanocrystals of about 34 nm by a method that combines particles agglomeration and sol-gel templating process. The structure properties of porous titania beads were investigated, and the results indicated that the porous titania beads in size of about 15 μm are pure anatase phase and featured by two types of pores with macropores centered at about 200 nm and mesopores smaller than 10 nm. The bimodal pore structure is attributed to hard aggregates of titania particles with different size. In particular, the larger titania nanocrystals agglomerate into macropores and the smaller ones from crystal growth of coated titania into mesopores. Finally, after cation modification, the bimodal porous adsorbents (BPA) were evaluated for investigating chromatographic performance and compared to microporous ones (MPA). It was observed that static and dynamic adsorption capacities of cytochrome C on BPA are both larger than that on MPA. Moreover, the BPApacked column shows better column efficiency than the MPA packed one in test flow rates. Therefore, we demonstrated that the BPA occupies more advantages over the other one and is expected for potential application in chromatography. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158908