scholarly journals Enhanced Visible Light Photocatalytic Activity ofV2O5Cluster Modified N-DopedTiO2for Degradation of Toluene in Air

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Fan Dong ◽  
Yanjuan Sun ◽  
Min Fu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Noble Metals ◽  
Large Scale ◽  
Low Cost ◽  
Photogenerated Electron ◽  
Visible Light Photocatalytic Activity ◽  
Highly Active ◽  
Photogenerated Electrons ◽  
Visible Light Photocatalytic

V2O5cluster-modified N-doped TiO2(N-TiO2/V2O5) nanocomposites photocatalyst was prepared by a facile impregnation-calcination method. The effects of V2O5cluster loading content on visible light photocatalytic activity of the as-prepared samples were investigated for degradation of toluene in air. The results showed that the visible light activity of N-doped TiO2was significantly enhanced by loading V2O5clusters. The optimal V2O5loading content was found to be 0.5 wt.%, reaching a removal ratio of 52.4% and a rate constant of 0.027 min−1, far exceeding that of unmodified N-doped TiO2. The enhanced activity is due to the deposition of V2O5clusters on the surface of N-doped TiO2. The conduction band (CB) potential of V2O5(0.48 eV) is lower than the CB level of N-doped TiO2(−0.19 V), which favors the photogenerated electron transfer from CB of N-doped TiO2to V2O5clusters. This function of V2O5clusters helps promote the transfer and separation of photogenerated electrons and holes. The present work not only displays a feasible route for the utilization of low cost V2O5clusters as a substitute for noble metals in enhancing the photocatalysis but also demonstrates a facile method for preparation of highly active composite photocatalyst for large-scale applications.

scholarly journals New insights into the origin of the visible light photocatalytic activity of Fe(iii) porphyrin surface anchored TiO2

2015 ◽  
Vol 1 (2) ◽  
pp. 177-187 ◽  
Author(s):  
M. L. ArunaKumari ◽  
L. Gomathi Devi
Keyword(s):  
Electron Transfer ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Conduction Band ◽  
Electron Donor ◽  
Visible Light Photocatalytic Activity ◽  
Photogenerated Electrons ◽  
Transfer Channels ◽  
Visible Light Photocatalytic ◽  
Anchored Tio2

The chemisorbed Hemin molecule acts as a sensitizer under visible light and transfers photogenerated electrons to the TiO2 conduction band through OC–O–Ti bonds which can act as electron transfer channels. The oxidized Hemin molecule is regenerated by triethanolamine a sacrificial electron donor.

Influence of Ytterbium Doping on the Visible Light Photocatalytic Activity of Mixed Phase TiO2 Nanoparticles

2019 ◽  
Vol 807 ◽  
pp. 18-25
Author(s):  
Fu Chang Peng ◽  
Qi Lai ◽  
Can Yu Zhong ◽  
Yan Cui ◽  
Xian Jie Liao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Phase Transfer ◽  
Photogenerated Electron ◽  
Mixed Phase ◽  
Fluorescent Light ◽  
Experimental Conditions ◽  
Visible Light Photocatalytic Activity ◽  
Ytterbium Doping ◽  
Visible Light Photocatalytic

The TiO2 nanoparticles with different Yb doping amount were prepared by a facile sol-gel method. The samples were characterized by XRD, TEM, XPS, UV-Vis, and PL, etc. The influence of Yb-doping on structure and visible light photocatalytic activity of mixed phase TiO2 was evaluated by photocatalytic degradation of methylene blue (MB) under the irradiation of fluorescent lamp. The results show that ytterbium appeared two kinds of Yb3+ and Yb2+ valence state on the surface of TiO2. Ytterbium doping can restrain the phase transfer from anatase to rutile, prevent the grain growth, and increase the surface hydroxyl content. Appropriate amount of Yb doping and the proportions of rutile and anatase mixed phase can effectively inhibit the recombination of photogenerated electron and hole, expand the wavelength range of absorption spectrum, and improve the photocatalytic performance of TiO2. Meanwhile, the photocatalytic activity of the Yb-TiO2 samples was the best under the irradiation of fluorescent light when the sintered temperature T=500°C and n(Yb):n(Ti)=0.009, it was 95.2% within 6 h and significantly higher than 56.4% of pure TiO2 under the same experimental conditions.

Large-scale preparation of heterometallic chalcogenide MnSb2S4 monolayer nanosheets with a high visible-light photocatalytic activity for H2 evolution

2016 ◽  
Vol 52 (91) ◽  
pp. 13381-13384 ◽  
Author(s):  
Zheguan Lin ◽  
Shangbo Ning ◽  
Zhenya Yang ◽  
Zizhong Zhang ◽  
Shuping Huang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Charge Separation ◽  
Large Scale ◽  
H2 Evolution ◽  
Visible Light Photocatalytic Activity ◽  
Large Scale Preparation ◽  
Monolayer Nanosheets ◽  
Scale Preparation ◽  
Visible Light Photocatalytic

Monolayered 2D MnSb2S4 nanosheets with a sandwich substructure of [SbS]+–[MnS2]2−–[SbS]+ improve charge separation and photocatalytic H2 evolution activity.

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