Effective coupling of phenol adsorption and photodegradation at the surface of micro-and mesoporous TiO2-activated carbon materials

Telegang Chekem Cédric, Richardson Yohan, Drobek Martin, Plantard G., Blin Joël, Goetz V.. 2017. Effective coupling of phenol adsorption and photodegradation at the surface of micro-and mesoporous TiO2-activated carbon materials. Reaction Kinetics, Mechanisms and Catalysis, 122 (2) : 1297-1321.

https://doi.org/10.1007/s11144-017-1265-0

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

	Version Online first - Anglais Accès réservé aux personnels Cirad Utilisation soumise à autorisation de l'auteur ou du Cirad. Effective coupling of phenol adsorption and photodegradation on AC.pdf Télécharger (1MB) \| Demander une copie
	Version publiée - Anglais Accès réservé aux personnels Cirad Utilisation soumise à autorisation de l'auteur ou du Cirad. s11144-017-1265-0.pdf Télécharger (1MB) \| Demander une copie

Quartile : Q3, Sujet : CHEMISTRY, PHYSICAL

Résumé : Novel titania supported activated carbon catalysts were prepared by a straightforward titania coating route of a microporous activated carbon (AC) derived from shea nut shells, and investigated in phenol photocatalytic degradation. The proposed coating method enables a fixation of the preformed titania anatase nanoparticles (TiO2 NPs) in the external porosity thus allowing their accessibility towards UV irradiation, without causing any reduction of the AC specific area. Interestingly, the coating treatment reshapes the porous texture of the as-prepared TiO2–AC composite materials resulting in an improvement of the adsorption capacity and the formation of an additional mesoporosity on the TiO2-AC surface. Photocatalytic experiments carried out in a batch reactor led to 97% elimination rate of phenol in an aqueous solution with the AC catalysts containing TiO2 NPs in the range from 11 to 34 wt%. The photodegradation performance of the TiO2–AC catalysts was maintained over several successive cycles, without the need of any regeneration treatment. Considering both the textural and microstructural features of the composite materials and their associated phenol removal kinetics, in this paper, we provide new insights into phenol photodegradation pathway involving an effective coupling of adsorption and photodegradation functionalities, resulting in a photo-assisted regeneration mechanism of the catalyst.

Mots-clés Agrovoc : adsorption, photolyse, charbon actif, enduit protecteur, fruits à coque

Mots-clés libres : Activated carbon, TiO2 nanoparticles, Composite materials, Photocatalysis, Adsorption, Catalyst regeneration

Classification Agris : 000 - Autres thèmes

Champ stratégique Cirad : Axe 2 (2014-2018) - Valorisation de la biomasse

Auteurs et affiliations