scholarly journals Doped ZnO Nanostructured and their application as photocatalytic: as Review

2021 ◽  
Vol 4 (1) ◽  
pp. 1-15
Author(s):  
Fadhela M. Hussein
Keyword(s):  
Visible Light ◽  
Energy Gap ◽  
Sol Gel ◽  
Chemical Vapor ◽  
Light Region ◽  
Methods Of Synthesis ◽  
Wet Chemical ◽  
Doped Zno ◽  
Light Absorbance ◽  
Photocatalytic Applications

There are two types of methods of synthesis of several different kinds of doped ZnO nanomaterials for photocatalytic applications, gas phase methods, include pulsed laser deposition and chemical vapor deposition and wet chemical methods such as sol–gel, electrospinning, hydrothermal, spray pyrolysis, thermomechanical .doping with metal ions is make local energies levels within the semiconductor energy gap, which results in prolongation of the light absorbance to the visible light region. Several studies have that metaldoped ZnO, such as N, S, and C, using Co, Fe, Cu, Eu, Ce, Ag, Mn, and Al and non-metal doping, ZnO to the reducing Energies and enhancement of photocatalytic behavior in the region of visible light.

Photocatalytic Activity of Bismuth Ferrite Nanoparticles Synthesized via Sol-Gel Route

2019 ◽  
Vol 233 (5) ◽  
pp. 595-607 ◽  
Author(s):  
Mohsin Siddique ◽  
Noor Muhammad Khan ◽  
Muhammad Saeed
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Irradiation Time ◽  
Bismuth Ferrite ◽  
Sol Gel ◽  
Reaction System ◽  
Light Conditions ◽  
X Ray Diffraction ◽  
Light Region ◽  
Gel Technique

Abstract Nanosized, magnetically separable bismuth ferrite (BFO) nanoparticles, pertaining a crystallite size in the range of 14–15 nm were prepared via facile sol-gel technique. The product was characterized by scanning electron microscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy. The product was explored for the photocatalytic mineralization of rhodamine B (RB) dye in aqueous medium. The effect of different investigational parameters such as amount of photocatalyst, initial dye concentration and irradiation time on the photocatalytic degradation of RB was studied. The results reveal that the catalyst shows good degrading ability under normal pH and visible light conditions. BFO nanoparticles demonstrated a strong absorption ability in the visible-light region, which lead to efficient photocatalytic degradation of RB dye The reaction system was heterogeneous in nature in which the catalyst can be separated by a normal magnet.

Effect of Transition Metal Oxide Doping (Cr, Co, V) in the Photocatalytic Activity of TiO2 for Congo Red Degradation under Visible Light

2014 ◽  
Vol 69 (5) ◽  
Author(s):  
P. W. Koh ◽  
L. Yuliati ◽  
S. L. Lee
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Congo Red ◽  
Sol Gel ◽  
Rutile Phase ◽  
Band Gap Energy ◽  
Electron Recombination ◽  
Doped Tio2 ◽  
Light Region ◽  
Electron Scavenger

Comparative study of Cr, Co or V-doped TiO2 was carried out. The photocatalysts were synthesized via sol-gel method. The results indicated that the dopants of Cr, Co, and V induced anatase to rutile phase transition of TiO2 at different dopant amounts of 1, 4, 2 mol%, respectively. Besides that, the existence of dopant extended the absorption wavelength of TiO2 to visible light region, thus making it a visible-driven photocatalyst. The doped transition metal exhibited different oxidation states on the TiO2 surface. The prepared photocatalysts were tested over photodegradation of Congo Red. Amongst all, Cr-doped TiO2 (3 mol%) was the best photocatalyst attributed to the presence of 45% rutile phase, reduced band gap energy of 2.30 eV and formation of Cr6+, which acted as an electron scavenger to delay the hole-electron recombination. 

Preparation of N-Doped TiO2 Photocatalytic Paint and its Sterilization Performance under Visible-Light Irradiation

2007 ◽  
Vol 336-338 ◽  
pp. 1964-1967
Author(s):  
Xiao Ning Zhang ◽  
Wen Bin Cao ◽  
Yan Hong Li ◽  
Fan Yong Ran
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Anatase Tio2 ◽  
Light Irradiation ◽  
Counting Method ◽  
Latex Paint ◽  
Light Region ◽  
Colony Counting ◽  
Nanocrystalline Anatase Tio2 ◽  
Light Absorbance

A new functional photocatalytic paint was prepared by adding N-doped nanocrystalline anatase TiO2 powders into self-engineered oxidation resistance latex paint system. The property of the UV-Vis light absorbance of the paint was characterized. The effects of the amount, types, and the introducing methods of the TiO2 in the paints on the behavior of the UV absorption, photocatalytic properties of the paint were systematically investigated. UV-Vis absorption spectra reveal that the ultraviolet light can strongly be absorbed by the paints. The absorption edge of the N-doped nanocrystalline anatase powders modified paint has red-shifted to visible light region. The colony counting method is used to study its sterilization performance under visible light irradiation. The sterilization experiments show that the rate of sterilizing staphylococcal bacteria by the N-doped TiO2 modified paint can exceed more than 99% after the paint has been irradiated by the visible light for 2 to 4 hours.

Synthesis of nitrogen-doped ZnO by sol–gel method: characterization and its application on visible photocatalytic degradation of 2,4-D and picloram herbicides

2015 ◽  
Vol 14 (3) ◽  
pp. 536-542 ◽  
Author(s):  
J. J. Macías-Sánchez ◽  
L. Hinojosa-Reyes ◽  
A. Caballero-Quintero ◽  
W. de la Cruz ◽  
E. Ruiz-Ruiz ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Irradiation ◽  
Zno Nanoparticles ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Light Irradiation ◽  
Gel Method ◽  
Nitrogen Doped ◽  
Doped Zno

The photocatalytic performance of modified 30% wt. N-ZnO nanoparticles under visible light irradiation was demonstrated by the oxidation of picloram and 2,4-D.

Photocatalytic Degradation of Methyl Orange by a New Photoctalyst Multi-Walled Carbon Nanotues (MWCNTs)/TiO2/CdS Nanocomposite

2012 ◽  
Vol 184-185 ◽  
pp. 1084-1089
Author(s):  
Ou Yang Ke ◽  
Xie Shan ◽  
Xiao Ou Ma ◽  
Meng Li ◽  
Qiu Lian Feng
Keyword(s):  
Methyl Orange ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Sol Gel ◽  
Oxidative Degradation ◽  
Pure Tio2 ◽  
First Order Kinetics ◽  
Composite Photocatalysts ◽  
Sol Gel Process ◽  
Light Absorbance

Composite photocatalysts using TiO2 coated by Multi-walled carbon nanotues(MWCNTs) and CdS were prepared by sol-gel process. The purpose of adding MWCNTs and CdS was extending the light absorbance range of pure TiO2 to visible light. Methyl orange (MO) was chosen as an object. The degradation of MO by MWCNTs/TiO2/CdS composite photocatalysts under visible light irradiation was studied. The results showed that the presence of MWCNTs and CdS can enhance the photoefficiency of TiO2 greatly. In addition, The photocatalyst was used for five cycles with photocatalytic degradation efficiency still higher than 96%. The photocatalytic degradation of MO followed a first-order kinetics according to the Langmuir-Hinshelwood model. A possible decomposing mechanism for the photocatalytic oxidative degradation was also discussed. The results of the study showed the potential use of MWCNTs/TiO2/CdS composite in degradation of toxic organic pollutants.

Characterization and activity of visible-light driven TiO2 photocatalyst doped with tungsten

2010 ◽  
Vol 62 (9) ◽  
pp. 2128-2133 ◽  
Author(s):  
T. Putta ◽  
M. C. Lu ◽  
J. Anotai
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Anatase Phase ◽  
Sol Gel ◽  
Light Illumination ◽  
Visible Light Region ◽  
Light Region ◽  
Acid Type ◽  
Visible Light Driven ◽  
Amorphous Tio2

This research aimed to expand the activity of TiO2 down to the visible light region by modifying the sol-gel conditions and doping with tungsten. The optimum conditions for calcination temperature, acid type, and heating rate were 200°C, HNO3, and 1°C/min, respectively. The undoped TiO2 synthesized under these conditions could significantly absorb the visible light whereas the commercial Degussa P-25 could not. The absorptivity decreased sequentially as the wavelength increased from 400 to 700 nm. Within 6 h of 2-W blue-light illumination, 23% of 0.1 mM 2-chlorophenol was removed. The XRD result showed that the crystalline was anatase phase. The visible-light absorption property of the TiO2 became even better when doped with tungsten. At the optimum W to TiO2 ratio of 0.5%, the degradation of 0.1 mM 2-chlorophenol increased to 53% indicating a higher photocatalytic activity. Both crystalline and amorphous TiO2 could exhibit the photocatalytic activity under the visible light region.

Synthesis, Characterization and Visible Light Photocatalytic Properties of BiOCl0.2Br0.1I0.7

2011 ◽  
Vol 52-54 ◽  
pp. 2094-2098 ◽  
Author(s):  
Kai Jin Huang ◽  
Hou Guang Liu ◽  
Chang Sheng Xie
Keyword(s):  
Visible Light ◽  
Electric Fields ◽  
Photocatalytic Properties ◽  
Bandgap Energy ◽  
Obvious Effect ◽  
Light Region ◽  
Powder Samples ◽  
Wet Chemical ◽  
First Time ◽  
Visible Light Photocatalytic

The ternary solid solution BiOCl0.2Br0.1I0.7 was successfully synthesized using a wet chemical method. The visible light photocatalytic properties of BiOCl0.2Br0.1I0.7 were investigated for the first time. Powder samples were characterized by XRD, SEM, UV-vis spectrophotometry and nitrogen sorption. BiOCl0.2Br0.1I0.7 absorbs intensely in the visible light region and the optical bandgap is 1.82eV. The chlorine and the bromine elements have an obvious effect in changing the bandgap energy and the particle size of the catalysts. The deep valance band edge position, the internal electric fields and the morphology give the BiOCl0.2Br0.1I0.7 best visible light photocatalytic properties.

Synthesis of Mn and Se-Doping TiO2 Mesoporous Materials and their Antibacterial Efficacy under Visible Light Irradiation

2011 ◽  
Vol 287-290 ◽  
pp. 1852-1855 ◽  
Author(s):  
Sheng Chu ◽  
Hao Yue Zhu ◽  
Min Xue ◽  
Lei Lei Luo ◽  
Fei Kong ◽  
...  
Keyword(s):  
Visible Light ◽  
Pore Size ◽  
Mesoporous Materials ◽  
Adsorption Property ◽  
Sol Gel ◽  
Light Region ◽  
Visible Light Driven ◽  
Se Doping ◽  
Mn Species ◽  
Adsorption Desorption

Two kinds of visible light driven mesoporous structured Mn and Se-doping TiO2 nanocrystal photocatalysts have been synthesized through a modified sol-gel method, and N2 adsorption-desorption isotherm confirms that the mesoporous materials possess large pore size and narrow pore size distribution. X-Ray powder Diffraction (XRD) analyses reveal that the doping of Mn and Se inhibits the growth of TiO2 anatase nanocrystal and the Mn species are higher dispersed on the surface of TiO2. Ultraviolet (UV)-vis spectrum demonstrates the excellent adsorption property of Mn doping TiO2 for visible light region, which enables this novel photocatalysis material to possess remarkable activity in photocatalytic antibacterial for E. Coli. bacteria under visible lights radiation.

scholarly journals Synthesis and Characterization of Pure and Nitrogen Doped Titanium Oxide Nanocrystallites for Visible Light Photocatalytic Applications

2021 ◽  
Vol 33 (4) ◽  
pp. 853-858
Author(s):  
R. Girija ◽  
S. Stella Mary ◽  
G. Balakrishnan
Keyword(s):  
Visible Light ◽  
Titanium Oxide ◽  
Energy Gap ◽  
Anatase Phase ◽  
Sol Gel ◽  
Blue Dye ◽  
Hydroxyl Groups ◽  
Band Shift ◽  
Doped Tio2 ◽  
Nitrogen Doped

The pure and nitrogen doped titanium oxide (TiO2) nanocrystallites were synthesized using sol-gel technique. The synthesized nanoparticles were characterized to examine the microstructural, optical and photocatalytic properties. The XRD studies of pure and doped TiO2 showed the formation of polycrystalline tetragonal structure with anatase phase. The crystallite sizes were calculated and found to be 17 and 15 nm for the pure and N-doped TiO2, respectively. FTIR studies indicated that the N-doped TiO2 bands are stronger compared with pure TiO2, indicating the more hydroxyl groups. FESEM studies showed the uniform formation of TiO2 nanocrystallites and spherical in shape with agglomeration. The photoluminescence spectra of the samples show emission peaks, indicating the band to band shift having the energy gap of 2.9 eV. The photocatalytic performance of the nanocatalyst was studied using methylene blue dye under visible light irradiation for 90 min. The photocatalytic efficiency of 66.9% and 85.8% is obtained for the pure and N-doped TiO2, respectively.

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