scholarly journals Photocatalytic removal of naphthalene (C10H8 ) from aqueous environments using sulfur and nitrogen doped titanium dioxide (TiO2 -N-S) coated on glass microbullets in presence of sunlight

2021 ◽  
Vol 23 (1) ◽  
pp. 34-43
Author(s):  
Abbas Jafari ◽  
Mehrban Sadeghi ◽  
Farhang Tirgir ◽  
Mehdi Barghaei
Keyword(s):  
Titanium Dioxide ◽  
Contact Time ◽  
Visible Region ◽  
Aqueous Environment ◽  
Optimal Conditions ◽  
Sem Images ◽  
X Ray ◽  
Nitrogen Doped ◽  
Doped Titanium Dioxide ◽  
Nitrogen Doped Titanium Dioxide

Background and aims: Due to their toxicity and carcinogenic effects, polycyclic aromatic hydrocarbons (PAHs) such as naphthalene (C10H8 ) are regarded as hazardous compounds for both humans and the environment, and it is essential to remove these contaminants from the environment. The present study aimed to remove naphthalene from a synthetic aqueous environment using sulfur and nitrogen doped titanium dioxide (TiO2 -N-S) nanoparticles (NPs) immobilized on glass microbullets under sunlight. Methods: In this experimental study, TiO2 -N-S NPs were synthesized using sol-gel process. The structure of NPs was investigated using X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray (EDX), and differential reflectance spectroscopy (DRS). In addition, using statistical analyses, the effects of parameters such as the initial concentration of naphthalene, pH, contact time, and the optimal conditions on naphthalene removal were investigated. Results: XRD patterns and SEM images of the samples confirmed the size of synthesized particles in nanometer. The EDX and DRS spectra analysis showed the presence of two elements (sulfur and nitrogen) and the optical photocatalytic activity in the visible region, respectively. The maximum level of naphthalene removal in the presence of sunlight was obtained to be about 93.55% using a concentration of 0.25 g of thiourea immobilized on glass microbullets at pH=5 and contact time of 90 minutes. Conclusion: The rate of naphthalene removal using the immobilized TiO2 -N-S on glass microbullets was 93.55% in optimal conditions. Therefore, this method has an effective potential for naphthalene removal, and can be used to remove naphthalene from industrial wastewater.

scholarly journals Hydrothermal Synthesis of Nitrogen-Doped Titanium Dioxide and Evaluation of Its Visible Light Photocatalytic Activity

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Junjie Qian ◽  
Guanjun Cui ◽  
Mingjun Jing ◽  
Yan Wang ◽  
Min Zhang ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Infrared Spectrometry ◽  
Molecular Formula ◽  
X Ray ◽  
Nitrogen Doped ◽  
Enhanced Absorption ◽  
Doped Titanium Dioxide ◽  
Nitrogen Doped Titanium Dioxide

Nitrogen-doped titanium dioxide (N-dopedTiO2) photocatalyst was synthesized from nanotube titanic acid (denoted as NTA; molecular formulaH2Ti2O5·H2O) precursorviaa hydrothermal route in ammonia solution. As-synthesized N-dopedTiO2catalysts were characterized by means of X-ray diffraction, transmission electron microscopy, diffuse reflectance spectrometry, X-ray photoelectron spectroscopy, electron spin resonance spectrometry and Fourier transform infrared spectrometry. It was found that nanotube ammonium titanate (NAT) was produced as an intermediate during the preparation of N-dopedTiO2from NTA, as evidenced by the N1sX-ray photoelectron spectroscopic peak ofNH4 +at 401.7 eV. The catalyst showed much higher activities to the degradation of methylene blue and p-chlorophenol under visible light irradiation than Degussa P25. This could be attributed to the enhanced absorption of N-dopedTiO2in visible light region associated with the formation of single-electron-trapped oxygen vacancies and the inhibition of recombination of photo-generated electron-hole pair by doped nitrogen.

Photoelectrochemical Study of Nitrogen-Doped Titanium Dioxide for Water Oxidation.

ChemInform ◽  
2004 ◽  
Vol 35 (30) ◽  
Author(s):  
Gemma Romualdo Torres ◽  
Torbjoern Lindgren ◽  
Jun Lu ◽  
Claes-Goeran Granqvist ◽  
Sten-Eric Lindquist
Keyword(s):  
Titanium Dioxide ◽  
Water Oxidation ◽  
Nitrogen Doped ◽  
Doped Titanium Dioxide ◽  
Nitrogen Doped Titanium Dioxide

Facile synthesis of nitrogen-doped titanium dioxide with enhanced photocatalytic properties

2019 ◽  
Vol 6 (11) ◽  
pp. 115019 ◽  
Author(s):  
Xiangji Li ◽  
Guoqing Zhang ◽  
Xiaofeng Wang ◽  
Weiping Liu ◽  
Kaifeng Yu ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Properties ◽  
Facile Synthesis ◽  
Nitrogen Doped ◽  
Doped Titanium Dioxide ◽  
Nitrogen Doped Titanium Dioxide
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