Enhanced decolourization of methyl orange by immobilized TiO/chitosan-montmorillonite.
Fiche publication
Date publication
août 2020
Journal
Water science and technology : a journal of the International Association on Water Pollution Research
Auteurs
Membres identifiés du Cancéropôle Est :
Pr SCHNEIDER Raphaël
Tous les auteurs :
Bahrudin NN, Nawi MA, Zainal Z, Schneider R, Sabar S
Lien Pubmed
Résumé
Many attempts have been made to improve the photocatalytic performance of immobilized photocatalysts for large-scale applications by modification of the photocatalyst properties. In this work, immobilized bilayer photocatalyst composed of titanium dioxide (TiO) and chitosan-montmorillonite (CS-MT) were prepared in a layer-by-layer arrangement supported on glass substrate. This arrangement allows a simultaneous occurrence of adsorption and photocatalysis processes of pollutants, whereby each layer could be independently modified and controlled to acquire the desired degree of occurring processes. It was found that the addition of MT clay within the CS composite sub-layer improved the mechanical strength of CS, reduced its swelling and shifted its absorption threshold to higher wavelengths. In addition, the band gap energy of the photocatalyst was also reduced to 2.93 eV. The immobilized TiO/CS-MT exhibited methyl orange (MO) decolourization rate of 0.071 min under light irradiation, which is better than the single TiO due to the synergistic processes of adsorption by CS-MT and photocatalysis by TiO layer. The MO dye took 6 h to achieve complete mineralization and produced sulfate and nitrate ions as the by-products. Furthermore, the immobilized TiO/CS-MT could be reused for at least ten cycles of application without significant loss of its activity.
Référence
Water Sci. Technol.. 2020 Aug;82(3):454-467