Visible photocatalytic activity of metal ion doped and undoped nano ZnO for the degradation of Acidal Navy Blue 3BR

2018 ◽  
Vol 1 (1) ◽  
pp. 32-52
Author(s):  
G Thennarasu ◽  
A Sivasamy
Keyword(s):  
Catalytic Activity ◽  
Organic Contaminants ◽  
Metal Ion ◽  
Oxygen Demand ◽  
Precipitation Method ◽  
Catalyst Loading ◽  
Nano Zno ◽  
Photo Catalytic Activity ◽  
Doped Zno ◽  
Co Doped

Metal (Mn, Cu, Co) doped and undoped Nano ZnO, prepared by chemical precipitation method and calcined at 300oC was characterized by XRD, FE-SEM, FT-IR, DRS and TEM. These photo catalysts can be effectively degrade organic contaminants using visible light irradiation. Doping reduces the intra granular resistance and recombination of the photo generated electron–hole pairs. The photo activity of undoped and doped ZnO powders was evaluated by monitoring the photo-decolourization of the aqueous solutions of Acidal Navy Blue 3BR (ANB 3BR) dye under visible irradiation. The disappearance of dye molecules followed pseudo-first-order kinetics. The effect of various parameters namely, pH of the medium, catalyst loading, initial dye concentration and kinetics of photo degradation of ANB 3BR was investigated. The rate of degradation was found to be strongly influenced by all above mentioned parameters. The reduction in the chemical oxygen demand (COD) of the decolorized aqueous samples revealed a possibility of complete destruction of the organic molecules along with colour removal. Experimental data were analyzed by model equations such as Langmuir and Freundlich isotherms and it was found that the Langmuir isotherm model best fitted the adsorption data. The results showed that the doped (Mn, Cu, Co) percentage (0.25, 0.5, 0.75, 1, 1.5%) were successfully doped into the ZnO and that manganese and copper-doping reduced the photo catalytic activity of ZnO, Co doped ZnO increase the photo catalytic activity.1%, 0.75%, 0.75% of Mn, Cu, Co doped in ZnO can be used in photo catalytic experiments.

Photo-Catalytic Activity of Ag-N Co-Doped ZnO/CuO Nanocomposite for Degradation of Methyl Orange

2016 ◽  
Vol 32 (1-2) ◽  
pp. 49
Author(s):  
Jemal Mohammed Yasin ◽  
O. P. Yadav ◽  
Abi M. Taddesse
Keyword(s):  
Catalytic Activity ◽  
Methyl Orange ◽  
Band Gap Energy ◽  
Spectroscopic Techniques ◽  
Solution Ph ◽  
Photo Catalytic Activity ◽  
Composite Photocatalysts ◽  
Doped Zno ◽  
Co Doped ◽  
Degradation Of Methyl Orange

Nano-size Ag-N co-doped ZnO-CuO composites have been synthesized and tested for their photo-catalytic activity towards degradation of methyl orange in aqueous solution under visible as well as UV radiations. Crystal structure, surface functional groups, metallic composition and band structure of as-synthesized nano-material were investigated using XRD, FTIR, AAS and UV-Vis spectroscopic techniques, respectively. Ag-N co-doped ZnO-CuO photocatalyst showed higher photo-catalytic activity than Ag- or N-doped and undoped composite photocatalysts. The observed highest activity of Ag-N co-doped ZnO-CuO among the studied photo-catalysts, is attributed to the cumulative effects of lowering of band-gap energy and decrease of recombination rate of photo-generated electrons and holes owing to doped N and Ag, respectively. Effects of photo-catalyst load, solution pH and substrate initial concentration on the degradation of methyl orange have also been studied.

Microwave-assisted synthesis of Ce-doped ZnO/CNT composite with enhanced photo-catalytic activity

2017 ◽  
Vol 43 (1) ◽  
pp. 84-91 ◽  
Author(s):  
Md. Elias ◽  
Md. Khairul Amin ◽  
Shakhawat H. Firoz ◽  
Md. Asjad Hossain ◽  
Sonia Akter ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Microwave Assisted Synthesis ◽  
Photo Catalytic Activity ◽  
Microwave Assisted ◽  
Doped Zno

Study on the Preparation of Nano Fe3O4 Powder and its Properties

2012 ◽  
Vol 178-181 ◽  
pp. 562-565
Author(s):  
Rui Cui Liu ◽  
Fu Yi Jiang ◽  
Zi Quan Liu
Keyword(s):  
Catalytic Activity ◽  
Rhodamine B ◽  
Catalytic Degradation ◽  
Model Reaction ◽  
Iron Chloride ◽  
Precipitation Method ◽  
Photo Catalytic Activity ◽  
Powder Samples ◽  
Nano Fe3o4 ◽  
Co Precipitation

The experiment used iron chloride, iron dichloride and other agents as the main resources to prepare the nano Fe3O4 powder by co-precipitation method. Magnets were used to test the magnetism of the prepared nano Fe3O4 powder samples. And the photo-catalytic degradation of rhodamine B solution was used as the model reaction to test the photo-catalytic activity of the prepared nano Fe3O4 powder. The results showed that the prepared nano Fe3O4 powder samples had good magnetism but low photo-catalytic activity.

Biological synthesis, physico-chemical characterization of undoped and Co doped α-Fe2O3 nanoparticles using Tribulus terrestris leaf extract and its antidiabetic, antimicrobial applications

2021 ◽  
Vol 12 (4) ◽  
pp. 045003
Author(s):  
A S Sakthi Athithan ◽  
J Jeyasundari ◽  
Y B A Jacob
Keyword(s):  
Metal Ion ◽  
Leaf Extract ◽  
Digestive Enzyme ◽  
Precipitation Method ◽  
Biological Synthesis ◽  
Diffusion Method ◽  
Tribulus Terrestris ◽  
Hematite Nanoparticles ◽  
X Ray ◽  
Co Doped

Abstract Hematite (α-Fe2O3) nanoparticles (NPs) were chemically and thermodynamically more stable among iron oxide nanoparticles. Doping of Co2+ metal ion in α-Fe2O3 can modify the structural, optical and magnetic properties of NPs and also enhances the potential of the biomedical applications. In the current study, undoped and Co doped hematite nanoparticles were synthesised by co-precipitation method using Tribulus terrestris L. leaf extract as bio-reductant. The magnetic, optical and structural investigations were studied with the help of Ultraviolet-visible (UV-Vis), Fourier Transform Infrared (FTIR), Scanning Electron Microscopy equipped with Energy Dispersive X-ray (SEM-EDX) Spectroscopy, Vibrating Sample Magnetometer (VSM) and X-ray Diffraction (XRD) Spectroscopy. XRD analysis shows that synthesized nanoparticles were in hematite phase, rhombohedral in structure. XRD spectral pattern clearly evidenced that prepared α-Fe2O3 and Co-Fe2O3 NPs were highly crystalline with no impurity peaks. Using VSM spectra, the M-H curve indicates that saturation magnetisation (Ms) value increases for Co-Fe2O3 NPs than undoped α-Fe2O3 NPs, it can be clearly seen that doping largely affects the magnetic nature of nanoparticles. In the UV-Vis spectra, absorption maxima increases and band gap value decreases for cobalt doped hematite nanoparticles indicating the substitution of Fe2+ ions by Co2+ ions in α-Fe2O3 lattice sites. Antidiabetic and antimicrobial activity of the synthesized undoped and Co doped hematite NPs were tested by alpha-amylase inhibitory and disc diffusion method. The Co-Fe2O3 NPs have greatly inhibited the digestive enzyme and microbial strains as compared to undoped α-Fe2O3 NPs.

Boron Doped ZnO Nanostructures for Photo Degradation of Methylene Blue, Methyl Orange and Rhodamine B

2021 ◽  
Vol 21 (4) ◽  
pp. 2483-2494
Author(s):  
Aqeel Ahmed Shah ◽  
Ali Dad Chandio ◽  
Asif Ahmed Sheikh
Keyword(s):  
Methylene Blue ◽  
Catalytic Activity ◽  
Methyl Orange ◽  
Rhodamine B ◽  
Recombination Rate ◽  
Charge Recombination ◽  
Photo Degradation ◽  
Photo Catalytic Activity ◽  
Doped Zno ◽  
Nonmetal Doping

The design of sensitive and efficient photo catalyst for the energy and environmental applications with minimum charge recombination rate and excellent photo conversion efficiency is a challenging task. Herein we have developed a nonmetal doping methodology into ZnO crystal using simple solvothermal approach. The boron (B) is induced into ZnO. The doping of B did not make any significant change on the morphology of ZnO nano rods as confirmed by scanning electron microscopy (SEM) without considerable change on periodic arrangement of nanostructures. The existence of B, Zn, and O is shown by energy dispersive spectroscopy (EDS). The X-ray diffraction (XRD) patterns are well matched to the hexagonal phase for both pristine ZnO and B-doped ZnO. The XRD has shown slight dislocation of 2theta degree. The UV-visible spectroscopy was used to measure the optical bandgap and photo catalytic activity for the degradation of organic dyes. The nonmetal doped ZnO has shown potential and outstanding photo catalytic activity for the photo degradation of methylene blue (MB), methyl orange (MO) and rhodamine B in aqueous solution. The photo degradation efficiency of MB, MO and rhodamine B is found to be 96%, 86% and 80% respectively. The enhanced photo catalytic activity of B-doped ZnO is indexed to the inhibited charge recombination rate due to the reduction in the optical bandgap. Based on the obtained results, it can be said that nonmetal doping is excellent provision for the design of active materials for the extended range of applications.

Synthesis of CoO-ZnO photocatalyst for enhanced visible-light assisted photodegradation of methylene blue

2022 ◽  
Author(s):  
Muhammad Saeed ◽  
Iltaf Khan ◽  
Muhammad Adeel ◽  
Nadia Akram ◽  
Majid Muneer
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Aqueous Phase ◽  
Organic Pollutants ◽  
Precipitation Method ◽  
Doped Zno ◽  
Co Doped

The synthesis of efficient photocatalysts for visible light-assisted photodegradation of aqueous phase organic pollutants has received significant consideration recently. In this research, Co-doped ZnO is synthesized by precipitation method for...

Preparation and Characterization of Ag and Co Doped ZnO Nano Particles

2012 ◽  
Vol 584 ◽  
pp. 248-252
Author(s):  
B. Sankara Reddy ◽  
S. Venkatramana Reddy ◽  
R.P. Vijaya Lakshmi ◽  
N. Koteeswara Reddy
Keyword(s):  
Blue Emission ◽  
Photo Luminescence ◽  
Hexagonal Structure ◽  
Nano Particles ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Doped Zno ◽  
Co Precipitation ◽  
Co Doped

Pure ZnO and Ag, Co doped ZnO nano particles [Zn1-xAgxCoyO, where x = 0.00 and 0.05, y = 0.05] were synthesized by chemical co precipitation method without use of surfactant. All the prepared samples calcinated in 1 hour at 500oC, after that the morphology of the samples were evaluated by Scanning Electron Microscope (SEM). The X- ray diffraction (XRD) results indicated that the synthesized co-doped ZnO nano crystals had the pure hexagonal structure without any significant change in the structure affected by Ag and Co substitution. Dopant elements Ag and Co are present in the ZnO host material and conformed by Energy Dispersive Analysis of X-ray Spectra (EDAX). The incorporation of Ag+ in the place of Zn2+ has made a considerable decrease in the size of nano crystals as compared to pure ZnO nano particles (It is to be noted that Co should be kept constant at 5 mol %). Blue emission was observed by Photo Luminescence (PL) Spectra.

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