An Investigation into the Effect of Ferroelectricity of BaTiO3 on the Photocatalytic Activity in Dye Decolourisation

2014 ◽  
Vol 93 ◽  
pp. 190-195 ◽  
Author(s):  
Yong Fei Cui ◽  
Joe Briscoe ◽  
Steve Dunn
Keyword(s):  
Heat Treatment ◽  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Charge Carrier ◽  
Strong Relationship ◽  
Internal Space ◽  
Photocatalytic Efficiency ◽  
Dye Decolourisation ◽  
Carrier Separation ◽  
Reduced Surface

We use BaTiO3 as a model photocatalyst to investigate the effect of ferroelectricity on catalytic activity against photocatalytic decolourisation of Acid Black 1. We find that there is a strong relationship between the degree of ferroelectric nature of the BaTiO3 and the catalytic activity. When Ag is photodeposited onto BaTiO3 to produce a modified BaTiO3, the higher tetragonal material content shows the highest photocatalytic efficiency even though there is a reduced surface area due to heat treatment. This change in the performance of the catalyst is associated with improvements in charge carrier separation due to the internal space charge layer formed in a ferroelectric due to the internal dipole.

Fabrication Porous Ag/BiVO4 Film for Efficient Degradation of Phenol under Visible Light

2012 ◽  
Vol 518-523 ◽  
pp. 732-735 ◽  
Author(s):  
Xi Qiang Li ◽  
Xiu Fang Zhang ◽  
Xiao Li Dong ◽  
Chun Ma ◽  
Xin Xin Zhang ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Degradation Rate ◽  
Photocatalytic Performance ◽  
Xrd Analysis ◽  
Diffusion Resistance ◽  
Photocatalytic Efficiency ◽  
Photogenerated Electrons ◽  
Ag Particles ◽  
Carrier Separation ◽  
Rapid Transfer

Porous BiVO4 film was fabricated by templating procedure with polystyrene (PS) balls as the template. Ag particles were loaded on the porous BiVO4 film by photoreduction technique. SEM revealed there were many pores in the film and Ag particles were successfully loaded on the porous BiVO4 film. XRD analysis indicated that the chemical state of Ag particles was metallic Ag. The experiment of photocatalytic degradation of phenol showed that the degradation rate on porous Ag/BiVO4 film was 4.74 times as much as that on the BiVO4 film. The enhanced photocatalytic performance was firstly attributed to the rapid transfer of the photogenerated electrons from BiVO4 to Ag, which could increase the charge carrier separation, limit their recombination, and enhance the photocatalytic efficiency. Furthermore, porosity of the photocatalyst may enhance diffusion process and decrease diffusion resistance of the reactants throughout the channels in the photocatalyst, and thus improves the surface reactions.

scholarly journals Effect of heat treatment under vacuum on structure and visible-light photocatalytic activity of nano-TiO2

RSC Advances ◽  
2019 ◽  
Vol 9 (56) ◽  
pp. 32691-32698
Author(s):  
Zhengyuan Gao ◽  
Pengfei Sun ◽  
Yiliu Fang ◽  
Chuanqiang Li ◽  
Xiaoya Yuan ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Visible Light ◽  
High Catalytic Activity ◽  
Nano Tio2 ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

Nano-TiO2 is known as a photocatalyst with high catalytic activity.

Synthesis of Ag, Pd-Loaded Bi2WO6 and its Photocatalytic Activities

2012 ◽  
Vol 518-523 ◽  
pp. 833-836 ◽  
Author(s):  
Li Guo ◽  
Dan Jun Wang ◽  
Feng Fu ◽  
Xiao Dan Qiang ◽  
Te Xu
Keyword(s):  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Charge Carrier ◽  
Experimental Results ◽  
Electron Hole ◽  
Photogenerated Charge Carrier ◽  
Photocatalytic Activities ◽  
Pure Bi2wo6 ◽  
Hole Recombination

Ag, Pd loaded Bi2WO6 photocatalyst were prepared via a photoreduction process and characterized with UV-Vis-DRS, XRD and FE-SEM. The photocatalysis experimental results indicated that the photocatalytic activity of Ag-loaded Bi2WO6 was greatly enhanced compared with pure Bi2WO6, and the content of silver has an impact on the catalytic activity of Ag-loaded Bi2WO6 photocatalyst. The loaded Ag and Pd acts as the electron receptor on the surface of Bi2WO6, which inhibits the recombination of photogenerated charge carrier between Ecb to the Evb in the Ag-loaded Bi2WO6. As a result, the reduction of electron-hole recombination decreased, which could significantly improve the photocatalytic activity.

Layered BiOCl/H+TiNbO5− heterojunctions for boosting visible-light-driven photocatalytic RhB degradation

2021 ◽  
Author(s):  
Chao Liu ◽  
Xin Gao ◽  
Caijun Zhangai ◽  
Ting Cheng ◽  
Yan Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Charge Carrier ◽  
Visible Light ◽  
Visible Light Driven ◽  
Carrier Separation

The construction of layered heterojunction photocatalyst could profoundly promote the charge carrier separation and thus boost the photocatalytic activity. In this work, a two-step exfoliation-reassembly process was firstly employed to...

Dependence of photocatalysis on charge carrier separation in Ag-doped and decorated TiO2nanocomposites

2016 ◽  
Vol 6 (24) ◽  
pp. 8428-8440 ◽  
Author(s):  
Ranjana S. Varma ◽  
Nirmala Thorat ◽  
R. Fernandes ◽  
D. C. Kothari ◽  
N. Patel ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Charge Carrier ◽  
Light Absorption ◽  
Visible Range ◽  
Photocatalytic Efficiency ◽  
Carrier Separation ◽  
The Relationship

Ag–TiO2nanocomposite systems have been investigated with the aim of understanding the relationship between the photocatalytic efficiency and the contributions of various structures resulting in charge carrier separation, charge transfer and extension of light absorption to the visible range.

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