scholarly journals Investigation the effect of anodization voltage on the geometrical properties and photocatalytic activity of TiO2 nanotube arrays for degradation of p-nitrophenol

2019 ◽  
Author(s):  
Kamyar Khoshsirat Janekbari ◽  
Neda Gilani ◽  
azadeh ebrahimian pirbazari
Keyword(s):  
Photocatalytic Degradation ◽  
Tio2 Nanotubes ◽  
Cumulative Effect ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Polluted Water ◽  
Nanotube Arrays ◽  
Order Kinetic ◽  
Anodization Voltage ◽  
Geometrical Properties

p-nitrophenol (PNP) is a nitroaromatic compound that poses a potential environmental hazard because of its acute toxicity, high carcinogenicity, low biodegradability and cumulative effect. Titanium dioxide (TiO2) nanotubes have shown great potential as ideal and powerful photocatalysts in purification of polluted water due to their high photo oxidation, anti-fogging, nontoxicity, good chemical stability and low cost. Therefore, TiO2 nanotube arrays were fabricated by two-step anodization process at 30,40 and 50V; and were used in photocatalytic degradation of organic pollution p-nitrophenol. In order to have the crystal structure, nanotubes were annealed at 450 °C for 2 hours. Characterizing of TiO2 nanotubes were evaluated by FESEM, XRD and Spectrophotometry analyses. Effect of anodization voltage on nanotube’s length and diameter were investigated. The result showed that as anodization voltage increases from 30V to 50V, nanotube’s length, diameter and wall thickness increase linearly from 1.4 μm to 4.8 μm, 45 nm to 100nm and 15nm to 25 nm, respectively. Increasing in anodization voltage lead to enhancement in porosity (0.4-0.5) and roughness factor (109-194) of TiO2 nanotubes, respectively. By investigating kinetic of degradation of p-nitrophenol, it was observed that mechanism of photocatalytic degradation for all samples are followed first order kinetic. The results indicate that amongst all synthesized samples, 50 V sample with 38%, shows the most efficiency in degradation of p-nitrophenol under UV irradiation.

scholarly journals Highly Ordered TiO2 Nanotube Arrays with Engineered Electrochemical Energy Storage Performances

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 510
Author(s):  
Wangzhu Cao ◽  
Kunfeng Chen ◽  
Dongfeng Xue
Keyword(s):  
Tio2 Nanotubes ◽  
Lithium Ion ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Free Standing ◽  
Structured Materials ◽  
Self Organized ◽  
Binder Free

Nanoscale engineering of regular structured materials is immensely demanded in various scientific areas. In this work, vertically oriented TiO2 nanotube arrays were grown by self-organizing electrochemical anodization. The effects of different fluoride ion concentrations (0.2 and 0.5 wt% NH4F) and different anodization times (2, 5, 10 and 20 h) on the morphology of nanotubes were systematically studied in an organic electrolyte (glycol). The growth mechanisms of amorphous and anatase TiO2 nanotubes were also studied. Under optimized conditions, we obtained TiO2 nanotubes with tube diameters of 70–160 nm and tube lengths of 6.5–45 μm. Serving as free-standing and binder-free electrodes, the kinetic, capacity, and stability performances of TiO2 nanotubes were tested as lithium-ion battery anodes. This work provides a facile strategy for constructing self-organized materials with optimized functionalities for applications.

NaAc Effect on the Anodization Formation of TiO2 Nanotube Arrays in Glycerol Based Electrolytes

2010 ◽  
Vol 105-106 ◽  
pp. 371-375
Author(s):  
Yu Xin Yin ◽  
Xin Tan ◽  
Feng Hou
Keyword(s):  
Growth Rate ◽  
Aspect Ratio ◽  
Dissolution Rate ◽  
Protective Coating ◽  
Tio2 Nanotubes ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Chemical Dissolution ◽  
Tio2 Surface

Effect of NaAc on the anodic growth of TiO2 nanotube arrays is described. NaAc-added approach yields longer nanotubes relative to samples grown from NaAc-free electrolyte. And the growth rate of TiO2 nanotubes has pH independency in NaAc-added electrolytes. The key to achieve a high aspect ratio TiO2 nanotube arrays is to decrease the chemical dissolution rate at the mouth of the tube by adding NaAc as protective coating. Adsorption of Ac- species on the TiO2 surface is shown to markedly decrease the chemical dissolution rate of the tube mouth, resulting in longer nanotube length.

Zinc-Doped TiO2 Nanotube Arrays

2010 ◽  
Vol 434-435 ◽  
pp. 446-447 ◽  
Author(s):  
Yang Yang ◽  
Xiao Hui Wang ◽  
Long Tu Li
Keyword(s):  
Tio2 Nanotubes ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Tio2 Nanotube Array ◽  
Tem Analysis ◽  
Nanotube Array ◽  
Doped Tio2 ◽  
Main Technique ◽  
Valence Structure

Zinc-doped TiO2 nanotube arrays were fabricated by immersing TiO2 nanotube arrays in zinc-containing solution for hours. And subsequent heat-treatment was crucial for Zn2+ coming into the crystal lattice of TiO2 nanotubes. TEM analysis was used as main technique to investigate the structure of zinc-doped TiO2 nanotubes, and found that the Zn2+ ions only combine into the lattice of TiO2 nanotubes. This kind of doping can change the valence structure in the surface of TiO2 nanotube array. The obtained zinc-doped TiO2 nanotube arrays have potential application in photocatalysis.

scholarly journals TiO2 Nanotubes: Metal-Cluster-Decorated TiO2 Nanotube Arrays: A Composite Heterostructure toward Versatile Photocatalytic and Photoelectrochemical Applications (Small 5/2015)

Small ◽  
2015 ◽  
Vol 11 (5) ◽  
pp. 553-553 ◽  
Author(s):  
Fang-Xing Xiao ◽  
Sung-Fu Hung ◽  
Jianwei Miao ◽  
Hsin-Yi Wang ◽  
Hongbin Yang ◽  
...  
Keyword(s):  
Tio2 Nanotubes ◽  
Metal Cluster ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays

TiO2 Nanotube arrays: Influence of tube length on the photocatalytic degradation of Paraquat

2016 ◽  
Vol 194 ◽  
pp. 1-6 ◽  
Author(s):  
Cédric B.D. Marien ◽  
Thomas Cottineau ◽  
Didier Robert ◽  
Patrick Drogui
Keyword(s):  
Photocatalytic Degradation ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Tube Length ◽  
Nanotube Arrays
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