Materials Research Bulletin, Vol.76, 8-21, 2016
Fabrication and properties of an immobilized P25TiO(2)-montmorillonite bilayer system for the synergistic photocatalytic-adsorption removal of methylene blue
A bilayer immobilized system consisting of a mesoporous montmorillonite (MT) as the sublayer and a porous P25TiO(2) toplayer was successfully fabricated on a glass plate. The MT sublayer was immobilized onto the glass plate by means of a glutaraldehyde (GLA) cross-linked poly (vinyl) alcohol (PVA) as the binder (MT-PVAB) while the top layer constituted of nano-sized TiO2 bound by the ENR-PVC polymer blends (P-25TiO(2)). The incorporation of MT-PVAB to P-25TiO(2) caused a reduction in the band gap energy while PLS emission spectra suggested higher separation rate for the photo-generated electron-hole pairs in the P-25TiO(2)/MT-PVAB/GP. The photocatalytic-adsorption. removal experiments showed that the P-25TiO(2)/MT-PVAB/GP enhanced removal rate of MB by an average of 4 times as compared with the immobilized monolayer P-25TiO(2) on a glass plate (P-25TiO(2)/GP). (C) 2015 Elsevier Ltd. All rights reserved.