New insights into the relationship between photocatalytic activity and TiO2–GR composites

RSC Advances ◽  
2015 ◽  
Vol 5 (37) ◽  
pp. 29201-29208 ◽  
Author(s):  
Yanyan Zhu ◽  
Yajun Wang ◽  
Wenqing Yao ◽  
Ruilong Zong ◽  
Yongfa Zhu
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Oxidation ◽  
Photocatalytic Reduction ◽  
Photoelectrochemical Properties ◽  
Oxidation Activity ◽  
Reduction Activity ◽  
The Relationship

Composited graphene cannot enhance the photocatalytic oxidation activity of TiO2, but can improve its photocatalytic reduction activity and photoelectrochemical properties.

Fabrication of surface hydroxyl modified g-C3N4with enhanced photocatalytic oxidation activity

2019 ◽  
Vol 9 (15) ◽  
pp. 3979-3993 ◽  
Author(s):  
Zizhen Li ◽  
Xiangchao Meng ◽  
Zisheng Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Surface Modification ◽  
Phenolic Compounds ◽  
Photocatalytic Oxidation ◽  
Oxidation Activity ◽  
Surface Hydroxyl

Photocatalytic activity of C3N4in the decomposition of phenolic compounds in water was significantly improved with hydroxyl surface modification.

A review on TiO2-based composites for superior photocatalytic activity

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Wail Al Zoubi ◽  
Abbas Ali Salih Al-Hamdani ◽  
Baek Sunghun ◽  
Young Gun Ko
Keyword(s):  
Photocatalytic Activity ◽  
Organic Pollutants ◽  
Cost Efficiency ◽  
High Stability ◽  
Photocatalytic Oxidation ◽  
Oxidation Process ◽  
Ambient Conditions ◽  
Photoelectrochemical Activity ◽  
As Doping ◽  
Degradation Of Pollutants

Abstract Heterogeneous photocatalysts was a promising material for removing organic pollutants. Titanium dioxide (TiO2) was a suitable photocatalyst for its cost efficiency and high stability to reduce various pollutants. Enhancing TiO2 photocatalyst performance by doping with changed metals or non-metal ions and organic compounds have been reviewed. These methods could enhance photoelectrochemical activity via: (i) by a donor of electrons via electron-donor agents that would produce particular defects in TiO2 structure and capture transporters of charge; (ii) by reducing recombination rate of the charge transporters and increasing degradation of pollutants. This study investigates the modification approaches of TiO2 that comprise methods for overcoming the essential TiO2 restrictions and enhancing the photocatalytic degradation of organic pollutants. Consequently, it emphasized on the current progress of modified-TiO2 used for different pollutants in ambient conditions. Amendment techniques, such as inorganic and organic parts as doping, are studied. The reported experimental results obtained with the photocatalytic oxidation process for degrading organic pollutants were also collected and assessed.

Direct Z-scheme Sn-In2O3/In2S3 heterojunction nanostructures for enhanced photocatalytic CO2 reduction activity

2021 ◽  
Author(s):  
Yinyi Ma ◽  
Zemin Zhang ◽  
Xiao Jiang ◽  
Rongke Sun ◽  
Mingzheng Xie ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Environmental Pollution ◽  
Light Absorption ◽  
Co2 Reduction ◽  
Photocatalytic Reduction ◽  
Practical Significance ◽  
Energy Crisis ◽  
Low Light ◽  
Reduction Activity

Photocatalytic reduction of carbon dioxide into chemical fuels has great practical significance in solving energy crisis and environmental pollution, but remains a big challenge owing to its low light absorption...

Annealing effect on the optical and photoelectrochemical properties of lead oxide

2018 ◽  
Vol 84 (3) ◽  
pp. 30301 ◽  
Author(s):  
Wided Zerguine ◽  
Djamila Abdi ◽  
Farid Habelhames ◽  
Meriem Lakhdari ◽  
Hassina Derbal-Habak ◽  
...  
Keyword(s):  
Lead Oxide ◽  
Orthorhombic Phase ◽  
Heat Treatments ◽  
Photoelectrochemical Properties ◽  
X Ray Diffraction ◽  
Vis Spectroscopy ◽  
Size And Morphology ◽  
Two Phases ◽  
P Type ◽  
The Relationship

Effect of the annealing oxidation time of electrodeposited lead (Pb) on the phase formation of lead oxide (PbO) films is reported. The phase structure, optical properties, size and morphology of the films were investigated by scanning electron microscopy, X-ray diffraction and UV-vis spectroscopy. The relationship between structur and photoelectrochemical properties was investigated. Thin films of PbO produced via air annealing of electrodeposited lead consist of a mixture of two phases, orthorhombic (o-PbO) and tetragonal (t-PbO), that determine the material properties and effectiveness as absorber layer in a photoelectrochemical device. The proportion of tetragonal t-PbO increases for longer heat treatments. After 40 h, the sample consists mainly of tetragonal t-PbO. The p-type semiconducting behavior of lead oxide was studied by photocurrent measurements. Different heat treatments yield variations in the ratio of tetragonal to orthorhombic lead oxide that effect on device performances, where devices with a higher content of tetragonal t-PbO show higher photocurrent than with the orthorhombic phase.

Enhanced photocatalytic reduction activity of uranium(vi) from aqueous solution using the Fe2O3–graphene oxide nanocomposite

2017 ◽  
Vol 46 (43) ◽  
pp. 14762-14770 ◽  
Author(s):  
Yadan Guo ◽  
Yiqin Guo ◽  
Xuegang Wang ◽  
Peng Li ◽  
Liuwei Kong ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Nuclear Industry ◽  
Photocatalytic Reduction ◽  
Potential Solution ◽  
Hexavalent Uranium ◽  
Reduction Activity ◽  
Radioactive Wastewater

Photocatalytic technologies are a potential solution for remediation of radioactive wastewater, including the reduction of radioactive hexavalent uranium, which is commonly found in wastewater from the nuclear industry.

scholarly journals Study of photocatalytic activity of TiO2 fluorinated by thermal shock method for the degradation of different dyes

2015 ◽  
Vol 18 (2) ◽  
pp. 121-131
Author(s):  
Khoa Tien Le ◽  
Ngoc Chau Hoang ◽  
Tien Thuy Thai ◽  
Anh Trung Le ◽  
Thinh Nguyen Huu Pham ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Thermal Shock ◽  
Photocatalytic Oxidation ◽  
Organic Dyes ◽  
Cationic Dye ◽  
Solution Ph ◽  
Ph Values ◽  
Methylene Blue Cationic Dye

TiO2 P25 was fluorinated by thermal shock method in order to study the influence of thermal shock fluorination on the surface properties and the photocatalytic activity for the degradation of cationic and anionic organic dyes at different pH values. The surface charge of catalysts was characterized by the pHPZC measurement. The photocatalytic activity of catalysts was evaluated via the degradation of methylene blue (cationic dye) and methyl orange (anionic dye). The results showed that the thermal shock fluorination and the rise of solution pH can increase the surface negative charge of TiO2, which enhanced the adsorption of methylene blue and then improved the photocatalytic degradation of this cationic dye under UV and visible light. On the other hand, after the fluorination, the adsorption of methyl orange on TiO2 was strongly reduced, which limited the photocatalytic oxidation of this anion dye.

Photocatalytic reactivity of {121} and {211} facets of brookite TiO2 crystals

2015 ◽  
Vol 3 (5) ◽  
pp. 2331-2337 ◽  
Author(s):  
Ming Zhao ◽  
Hua Xu ◽  
Hungru Chen ◽  
Shuxin Ouyang ◽  
Naoto Umezawa ◽  
...  
Keyword(s):  
Band Structure ◽  
Atomic Structure ◽  
Photocatalytic Oxidation ◽  
Electronic Band Structure ◽  
Photocatalytic Reduction ◽  
Electronic Band

Combining the surface atomic structure and electronic band structure, it is suggested that, for brookite TiO2, the {121} surface is beneficial for photocatalytic oxidation and the {211} surface can facilitate photocatalytic reduction.

In situ hydrothermal etching fabrication of CaTiO3 on TiO2 nanosheets with heterojunction effects to enhance CO2 adsorption and photocatalytic reduction

2019 ◽  
Vol 9 (2) ◽  
pp. 336-346 ◽  
Author(s):  
Jinjin Lin ◽  
Jiangshan Hu ◽  
Chengwei Qiu ◽  
Huijuan Huang ◽  
Lu Chen ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Co2 Adsorption ◽  
Photocatalytic Reduction ◽  
Tio2 Nanosheets

In situ fabricated CaTiO3/TiO2 heterojunction shows highly photocatalytic activity for reduction of CO2 to CO with H2O.

Sign in / Sign up

Export Citation Format

Share Document