Effect of Ag Co-catalyst on TiO2–Cu2O nanocomposites structure and apparent visible photocatalytic activity. (15th April 2020)

• Record Type: Journal Article
• Authors: Nagy, Dávidné; Chao, Cong; Marzec, Bartosz; Nudelman, Fabio; Ferrari, Maria-Chiara; Fan, Xianfeng
• Is Part Of: Journal of environmental management. Volume 260(2020)
• Publication Date: 2020-04-15
• Subjects: Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2020.110175
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Although Cu2 O is a commonly used narrow band gap semiconductor to fabricate visible response photocatalysts, up to date there are only a few reports on Ag co-catalysed TiO2 –Cu2 O nanocomposites. Herein we report a facile wet chemical synthesis approach to prepare TiO2 –Ag–Cu2 O ternary hybrid nanomaterials. Uniquely, both the effect of Ag content and the synthesis sequence of Ag deposition step was investigated on the visible decoloration rate. The crystal structure, morphology, optical and dark adsorption properties of the nanostructures were characterized by XRD, SEM, TEM and diffuse reflectance, respectively. Due to the mixed indirect and direct nature of the nanocomposites, the band gap estimation was performed by using both Tauc plot and differential reflectance model. The dark adsorption properties of catalysts could be typically well-approximated by pseudo-second order kinetics, while TiO2 –Ag(5%)-Cu2 O catalyst cannot be described by standard models due to a delayed adsorption behaviour observed in the first 50 min. The apparent visible activities followed pseudo-zero order kinetics. It was found that TiO2 –Ag(3%)-Cu2 O catalyst exhibited the highest rate constant which was ca. two times as high as that of the binary TiO2 –Cu2 O catalyst. The synthesis sequence of the Ag deposition step significantly altered the material properties which resulted in different dark adsorption and apparent visible activities. Graphical abstract: Image 1 Highlights: TiO2–Ag–Cu2O catalyst exhibited twice high ca. than the binary TiO2–Cu2O catalyst. Ag-deposition step had major effect on the optical properties and morphology. Ag amount has a significant effect on the dark and apparent visible activities. The apparent visible activities can be approximated by pseudo-zero order kinetics.