Unveiling General Rules Governing Dimensional Evolution of Branched TiO2 and Impacts on Photo-electrochemical Behaviours

2021 ◽  
Author(s):  
Teera Butburee ◽  
Yang Bai ◽  
Lianzhou Wang
Keyword(s):  
Titanium Dioxide ◽  
Energy Conversion ◽  
Charge Transport ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
General Rules ◽  
Branched Nanostructures

Branched nanostructures represent a unique group of nanoarchitectures exhibiting advantageous high surface area and excellent charge transport for energy conversion application compared to their bulk counterparts. Especially, branched titanium dioxide...

Composite Titanium Dioxide Photocatalysts and the "Adsorb & Shuttle" Approach: A Review

2010 ◽  
Vol 162 ◽  
pp. 135-162 ◽  
Author(s):  
Yaron Paz
Keyword(s):  
Titanium Dioxide ◽  
Surface Area ◽  
Degradation Rate ◽  
High Surface ◽  
High Surface Area ◽  
Strength Of Interaction ◽  
Composite Photocatalysts ◽  
End Products ◽  
Operation Parameters ◽  
Specific Species

Composite photocatalysts, made of titanium dioxide and high surface area adsorbents become more and more common. To large extent, this is due to the phenomenon of "Adsorb & Shuttle", i.e. the adsorption of molecules on the inert, adsorptive, domains, followed by diffusion to the photocatalytic domains. This manuscript reviews the published literature on composite photocatalysts, and analyzes the various aspects affecting their performance. One of these aspects is the enhancement of the degradation rate of pollutants, which is governed by a variety of factors including surface area, adsorpticity, strength of interaction, the loading of photocatalyst in the composite, and operation parameters (such as temperature, humidity and pH). Other aspects include a reduction in the emission of intermediate products and a different distribution of end-products. Care was taken to describe the possibility of using the inert adsorptive domains to enhance the degradation of specific species, as well as to discuss the effect of composite photocatalysts on deactivation phenomena, and the interrelation between "Adsorb & Shuttle" phenomena and out- diffusion of oxidizing species from the TiO2 domains, known as the "remote degradation" phenomenon.

High surface area, high catalytic activity titanium dioxide aerogels prepared by solvothermal crystallization

2020 ◽  
Vol 47 ◽  
pp. 223-230 ◽  
Author(s):  
Xian Yue ◽  
Junhui Xiang ◽  
Junyong Chen ◽  
Huaxin Li ◽  
Yunsheng Qiu ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Catalytic Activity ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
High Catalytic Activity

Preparation and characterization of high-surface-area titanium dioxide by sol-gel process

2006 ◽  
Vol 13 (3-4) ◽  
pp. 251-258 ◽  
Author(s):  
Chaochin Su ◽  
Kuei-Fen Lin ◽  
Ya-Hui Lin ◽  
Bor-Hou You
Keyword(s):  
Titanium Dioxide ◽  
Surface Area ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Sol Gel Process

Soft‐template synthesis of high surface area mesoporous titanium dioxide for dye‐sensitized solar cells

2018 ◽  
Vol 43 (1) ◽  
pp. 523-534 ◽  
Author(s):  
Prabhakaran Selvaraj ◽  
Anurag Roy ◽  
Habib Ullah ◽  
Parukuttyamma Sujatha Devi ◽  
Asif Ali Tahir ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Solar Cells ◽  
Surface Area ◽  
Template Synthesis ◽  
High Surface ◽  
High Surface Area ◽  
Dye Sensitized Solar Cells ◽  
Soft Template ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

scholarly journals Efficiency of solar water disinfection photocatalized by titanium dioxide of varying particle size

2007 ◽  
Vol 5 (3) ◽  
pp. 335-340 ◽  
Author(s):  
F. M. Salih ◽  
A. E. Pillay
Keyword(s):  
Particle Size ◽  
Titanium Dioxide ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Tio2 Particle ◽  
Water Disinfection ◽  
Local Concentration ◽  
Bacterial Cells ◽  
Radical Interaction

Titanium dioxide photocatalysed water disinfection is induced by the interaction of light with TiO2, which generates highly reactive free hydroxyl radicals (OH•). These free radicals create lethal damage that leads to bacterial death. Normally, decreasing TiO2 particle size increases the area of light interaction. This may possibly increase the concentration of OH• generated and hence increases disinfection efficiency. Moreover, decreasing the particle size increases the force of attraction between the particles and cells, which could create aggregates that may contribute to the local OH• concentration. In the present investigation cells of Escherichia coli were used as the test microorganism, TiO2 as the photocatalyst and sunlight as the light source. Four different surface areas of TiO2 particles corresponding to 10, 50, 80–100 and ≥300 m2 g−1 were tested at a concentration of 1 g l−1. Disinfection efficiency increased with increasing the surface area producing a maximum between 80–100 m2 g−1 followed by a reduction at ≥300 m2 g−1. The reduction in the efficiency at this relatively high surface area was attributed to the increase in the local concentration of OH•. This increase may be high enough to initiate radical-radical interaction that would compete with bacterial cells and reduce the chance of bacterial cell-radical interaction taking place. Moreover, the phenomenon of TiO2 aggregation with bacterial cells plays an important role, and the extent of aggregation increases with decreasing particle size. Such aggregation could augment the concentration of OH• within the cell vicinity. This suggests that surface area is a key factor in determining the efficiency of disinfection, and that concentration is a vital factor.

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