New Precursor Route Using a Compositionally Flexible Layered Oxide and Nanosheets for Improved Nitrogen Doping and Photocatalytic Activity

2018 ◽  
Vol 1 (4) ◽  
pp. 1734-1741 ◽  
Author(s):  
Kazuhiko Maeda ◽  
Yuki Tokunaga ◽  
Keisuke Hibino ◽  
Kotaro Fujii ◽  
Hiroyuki Nakaki ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Nitrogen Doping ◽  
Layered Oxide ◽  
Precursor Route

Photocatalytic Degradation of Methylene Blue Using Visible Light Active N-Doped ZnO

2015 ◽  
Vol 1101 ◽  
pp. 299-302 ◽  
Author(s):  
Hanggara Sudrajat ◽  
Sandhya Babel
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Nitrogen Doping ◽  
Spectral Response ◽  
Aqueous Suspension ◽  
Visible Region ◽  
Active Nitrogen ◽  
Visible Light Active ◽  
Doped Zno

A visible light active nitrogen-doped ZnO (N-ZnO) was synthesized using a solvent-free mechanochemical method and applied to degrade methylene blue (MB) dye in aqueous suspension. Results showed that nitrogen doping improved the photocatalytic activity of pristine ZnO by extending its spectral response to visible region. Using 2 g/L of N-ZnO, 98% MB with the initial concentration of 10 mg/L could be degraded within 2 h at pH 7 under 11.3 klux of visible light irradiation. After 6th run, it still exhibited appreciable photocatalytic activity with 94% MB degradation, indicating its high reusability though a simple pretreatment was performed.

scholarly journals Superhydrophobic and photocatalytic self-cleaning on cotton fabric using fluorine-free flower-like-TiO2/PDMS coatings

2021 ◽  
Author(s):  
Esfandiar Pakdel ◽  
Hai Zhao ◽  
Jinfeng Wang ◽  
Bin Tang ◽  
Russell Varley ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Cotton Fabric ◽  
Nitrogen Doping ◽  
Dip Coating ◽  
Polydimethyl Siloxane ◽  
Water Contact ◽  
Highly Efficient ◽  
Coating Method ◽  
Self Cleaning ◽  
The Impact

Abstract This research presents the development of novel self-cleaning cotton fabric with dual functionalities of superhydrophobicity and photocatalytic activity. Fluorine-free coating formulations composed of either flower-like TiO2 or nitrogen-doped TiO2 particles, with a hierarchical surface morphology, and polydimethyl siloxane (PDMS) polymer were applied to cotton fabrics using a facile dip-coating method. The self-cleaning performance of fabrics was assessed based on their superhydrophobicity and effective removal of oil-based food stains. Additionally, the impact of nitrogen doping on photocatalytic activity of flower-like TiO2 particles was investigated. The obtained results demonstrated that the presence of both PDMS and hierarchical particles generated excellent superhydrophobicity on the cotton fabric with a water contact angle of 156.7 ± 1.9⁰. In addition, the coated fabric exhibited highly efficient photocatalytic activity, decomposing stains under simulated sunlight. Nitrogen doping process significantly boosted the photocatalytic activity of TiO2 particles in degrading stains and dye solution. The developed superhydrophobic fabric showed high robustness against both chemical and physical durability tests. This research contributes significantly to the continued advancement of highly efficient self-cleaning textiles via the development of dual functions of superhydrophobicity and photocatalytic activity.

scholarly journals Characterisation of oxygen defects and nitrogen impurities in TiO2 photocatalysts using variable-temperature X-ray powder diffraction

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Christopher Foo ◽  
Yiyang Li ◽  
Konstantin Lebedev ◽  
Tianyi Chen ◽  
Sarah Day ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Powder Diffraction ◽  
Nitrogen Doping ◽  
Elevated Temperatures ◽  
Variable Temperature ◽  
Anatase Phase ◽  
Structural Defects ◽  
Powder Materials ◽  
X Ray

AbstractTiO2-based powder materials have been widely studied as efficient photocatalysts for water splitting due to their low cost, photo-responsivity, earthly abundance, chemical and thermal stability, etc. In particular, the recent breakthrough of nitrogen-doped TiO2, which enhances the presence of structural defects and dopant impurities at elevated temperatures, exhibits an impressive visible-light absorption for photocatalytic activity. Although their electronic and optical properties have been extensively studied, the structure-activity relationship and photocatalytic mechanism remain ambiguous. Herein, we report an in-depth structural study of rutile, anatase and mixed phases (commercial P25) with and without nitrogen-doping by variable-temperature synchrotron X-ray powder diffraction. We report that an unusual anisotropic thermal expansion of the anatase phase can reveal the intimate relationship between sub-surface oxygen vacancies, nitrogen-doping level and photocatalytic activity. For highly doped anatase, a new cubic titanium oxynitride phase is also identified which provides important information on the fundamental shift in absorption wavelength, leading to excellent photocatalysis using visible light.

Effect of nitrogen doping on the photocatalytic activity and hydrophobic property of rutile TiO2 nanorods array

2018 ◽  
Vol 50 (12-13) ◽  
pp. 1271-1277 ◽  
Author(s):  
Peerawas Kongsong ◽  
Abdelhafed Taleb ◽  
Mahamasuhaimi Masae ◽  
Ausmee Jeenarong ◽  
Pariyaphan Hansud ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Nitrogen Doping ◽  
Tio2 Nanorods ◽  
Hydrophobic Property ◽  
Rutile Tio2 ◽  
Nanorods Array

Feasibility of Hydrothermal Nitrogen Doping Process for Enhancing Visible Light Photocatalytic Activity of Metatitanic Acid Powder

2013 ◽  
Vol 761 ◽  
pp. 41-45
Author(s):  
Se Keun Park ◽  
Ji Eun Woo ◽  
Hyun Ho Shin
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Nitrogen Doping ◽  
Uv Light ◽  
Hydrothermal Process ◽  
Ammonium Hydroxide ◽  
Nitrogen Sources ◽  
Wide Band ◽  
Metatitanic Acid ◽  
Sulfate Process

Wide band-gap photocatalyst is active only under UV light irradiation. Nitrogen doping into photocatalyst is able to extend the light absorption to the visible light region, allowing more solar energy to be utilized in photocatalytic applications. The hydrothermal process is widely applied for the preparation of nitrogen-doped TiO2. The hydrothermal method is attractive for its simplicity and environment friendly conditions. Metatitanic acid (MTA) is an industrially available intermediate product in sulfate process for TiO2production, which is mesoporous material with large specific surface area and pore volume. In this work, MTA powder was hydrothermally treated with three types of nitrogen sources (urea, hexamethylenetetramine, and ammonium hydroxide) and subsequently heat-treated in N2flow. The results of UV-Vis diffuse reflection spectra and XPS show that it is possible to dope the nitrogen dopant into MTA by the hydrothermal process and the post-heat treatment. Higher photocatalytic activity in photodegrading rhodamine B dye under visible light was obtained when processed in ammonium hydroxide (MTA-A), but weaker in the samples of urea (MTA-U) and hexamethylenetetramine (MTA-H).

Preparation and nitrogen-doping of three-dimensionally ordered macroporous TiO2 with enhanced photocatalytic activity

2014 ◽  
Vol 40 (7) ◽  
pp. 11213-11219 ◽  
Author(s):  
Yan Dong ◽  
Youhe Wang ◽  
Tonghui Cai ◽  
Long Kou ◽  
Guidong Yang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Nitrogen Doping ◽  
Ordered Macroporous
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