Ag2O/TiO2/V2O5 one-dimensional nanoheterostructures for superior solar light photocatalytic activity

Abstract

Titanium dioxide has attracted considerable interest as a prototypical semiconductor photocatalyst. However, because of the relative large bandgap energy, further application of TiO2 photocatalyst is limited by its inefficient solar energy conversion. Various attempts have been made to broaden the light absorption window of the TiO2, such as growth of TiO2-based heterostructures. Herein, a novel three-component system, Ag2O/TiO2/V2O5 one-dimensional nanoheterostructures with enhanced solar light absorption, is prepared by depositing Ag2O nanoparticles onto the surface of TiO2/V2O5 nanofibers through a two-step synthetic process. This three-component system exhibits excellent solar-driven photocatalytic activity, far exceeding those of the single- and two-component systems, as a result of extended solar light absorption and efficient electron-hole separation. Furthermore, the photocatalytic performance of Ag2O/TiO2/V2O5 one-dimensional nanoheterostructures is very stable for recycling use.

Evaluation of sunlight induced structural changes and their effect on the photocatalytic activity of V2O5 for the degradation of phenols

“…Where, F(R) is the Kubelka-Munk transformation of %R values and hν is the incident photon energy. The evaluated band edge position of ~2.39 eV for unexposed and ~2.30 eV for sunlight exposed V 2 O 5 was in accordance with literature values [50].…”

Synthesis and Characterization of Ag-Ag2O/TiO2@polypyrrole Heterojunction for Enhanced Photocatalytic Degradation of Methylene Blue

“…The observed higher photocatalytic activity of Ag/TiO2@PPy than TiO2@PPy, Ag/TiO2, and TiO2 may be due to the fact that PPy and Ag nanoparticles may act as an interfacial charge carrier in the Ag-TiO2-PPy system, which leads to the prevention of electron-hole (e − /h + ) pair recombination, thereby increasing the photocatalytic activity. Moreover, the effectiveness of a ternary composite system (Ag/TiO2@PPy) was comparatively enhanced due to the synergistic effect of Ag (Ag-Ag2O), TiO2 and PPy [29,30]. On the basis of this study, the Ag/TiO2@PPy composite was used for further photocatalytic studies.…”

Fabrication of Hierarchical V2O5 Nanorods on TiO2 Nanofibers and Their Enhanced Photocatalytic Activity under Visible Light

“…[1,8,9] Several semiconducting metal oxides (SMO) are attractive materials for photocatalysis, such as titanium dioxide (TiO 2 ), vanadium pentoxide (V 2 O 5 ), zinc oxide (ZnO), tungsten oxide (WO 3 ), and tin dioxide (SnO 2 ) [9,10] and offer highp hotocatalytic activitiesa tr oom temperatures. [11] TiO 2 is ap romising photoca-talyst for hydrogen production and find applications as selfcleanings urfaces, as antibacterial materials, or in solar andf uel cells. [12,13] TiO 2 particles are naturally abundant and offer strong oxidizingp owerf or decomposition of toxic organic compounds.…”

“…[9,13] However,t he wide band-gap energy (E g )o fT iO 2 ( % 3.0-3.2 eV) limits itsp hotocatalytic activities to only the UV range of light.Am ajority of high-performance photocatalyst systemsw ork only under UV light, [9] although the natural solar light only contains % 5-7 %U V-light irradiation of the entire solar spectrum,t husl imiting the extent of photocatalytic reactivity in many practical applications. [11] Visible-light-induced photoreactivity of TiO 2 was improved by doping TiO 2 with other metalso rn onmetals, e.g.,m etal particleso fV ,P t, Pd, or Au, or nonmetalc arbon particles, and mixingw ith otherm etal oxides, such as SnO 2 ,Z nO, and V 2 O 5 . [14,15,16] As doping processes are sometimes costly and complex, it is imperative that simpler and cost-effective processes should be developed for fabrication of heterostructures involving TiO 2 and other low-band-gap SMO materials.…”

“…In this regard, vanadium pentoxide offers narrow E g % 2.8 eV andi sa good candidatef or the development of catalysts for photooxidation of the VOCs under visible light. [11,17] Photocatalytic oxidation of liquid cyclohexane and photocatalytic degradation of water pollutantsa re reported in literature. [18,19] Low quantum yield is ab ottleneck in the photocatalytic performance of SMOs.…”