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...

scholarly journals Fabrication of Fe-doped ZnO/Nanocellulose Nanocomposite as an Efficient Photocatalyst for Degradation of Methylene Blue Under Visible Light

2022 ◽  
Author(s):  
Mohammad Saeed Vasheghani Farahani ◽  
Maryam Nikzad ◽  
Mohsen Ghorbani
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Chemical Precipitation ◽  
Degradation Efficiency ◽  
Hydroxyl Group ◽  
Precipitation Method ◽  
Molar Ratios ◽  
Doped Zno

Abstract In this work, a photocatalytic nanocomposite, Fe-doped ZnO/nanocellulose, was synthesized using an in-situ method and examined for methylene blue (MB) degradation. For this purpose, pure ZnO (PZ) was synthesized by the chemical precipitation method and then subjected to Fe+3 doping with different concentrations of Fe3+ (1, 3, and 5 mol%). The PZ and Fe-doped ZnO (FZ) samples were characterized using several standard analyses. UV-vis DRS analysis was also used to investigate the effect of Fe3+ doping on the bandgap of PZ. The doping of Fe3+ enhanced the photocatalytic activity of ZnO under visible light. The degradation efficiency of FZ samples (> 50%) was enhanced compared to the pristine ZnO (36.91%) during the same period. The catalyst with the highest degradation efficiency (94.21%) was then conjugated with broom corn stalk-derived nanocellulose (NC) at varying NC/ Zn2+ molar ratios (0.1, 0.2, 0.3, and 0.4) and characterized by various analyses. The NC enhanced the hydroxyl group at the surface of the nanocomposite, consequently improved the photocatalytic performance of the synthesized samples. The ability of the optimized photocatalyst for MB degradation was assessed. The effect of operating parameters such as pH, catalyst dosage, and initial MB concentration was investigated and degradation efficiency of 98.84% was achieved at the optimum condition. Besides, photocatalyst regeneration study indicated the great photocatalytic performance of this nanocomposite with no loss in its degradation efficiency. The facile synthesis and fast degradation rate of this nanocomposite make it a promising candidate for real-world wastewater treatment.

scholarly journals Synthesis and photocatalytic activity studies of Silver-Nitrogen co-doped ZnO-Fe2O3 nanocomposites for the degradation of Methylene blue under UV-Visible region

2020 ◽  
Vol 10 (7) ◽  
pp. 659
Author(s):  
Wondimagegn Kumala
Keyword(s):  
Methylene Blue ◽  
Binary Systems ◽  
Diffuse Reflectance Spectroscopy ◽  
Visible Region ◽  
Precipitation Method ◽  
Bandgap Energy ◽  
X Ray Diffraction ◽  
Uv Visible ◽  
Doped Zno ◽  
Co Doped

The binary systems of ZnO-Fe<sub>2</sub>O<sub>3</sub> nanocomposites were synthesized by a precipitation method with aqueous solutions of Fe and Zn nitrate, whereas nitrogen-doped ZnO-Fe<sub>2</sub>O<sub>3</sub>, silver-doped ZnO-Fe<sub>2</sub>O<sub>3,</sub> and silver-nitrogen co-doped ZnO-Fe<sub>2</sub>O<sub>3</sub> nanocomposite were prepared by solid-state reaction. The structure and bandgap of the composites were studied using X-ray diffraction (XRD) and UV-visible diffuse reflectance spectroscopy (UV–vis). An aqueous model pollutant Methylene blue (MB) dye solution was used to evaluate photocatalytic degradation activities of the nanocomposites under visible light irradiation. Doping photocatalyst significantly increased the effectiveness of the photocatalyst in reducing bandgap energy. So 2.05 eV is the lowest energy, which is for Ag/N co-doped ZnO-Fe<sub>2</sub>O<sub>3 </sub>photocatalysts. Results of the experiment that involved the photocatalysts revealed that Methylene blue degradations of 45.11%, 47%, 51%, and 64.5% in 180 min under light radiation using ZnO-Fe<sub>2</sub>O<sub>3</sub>, Ag-doped ZnO-Fe<sub>2</sub>O<sub>3</sub>, N-doped ZnO-Fe<sub>2</sub>O<sub>3,</sub> and Ag/N co-doped ZnO-Fe<sub>2</sub>O<sub>3</sub>, respectively. The doped photocatalysts were all superior to the undoped ZnO-Fe<sub>2</sub>O<sub>3</sub>. The efficiency of Ag/N co-doped ZnO-Fe<sub>2</sub>O<sub>3 </sub>photocatalysts was higher on the photodegradation of MB at optimum PH, the load of Methylene blue photocatalyst which is 78%.

Synthesis of Visible-Light Responsive CdS/ZnO Nanocomposite Photocatalysts via Simple Precipitation Method

2014 ◽  
Vol 608 ◽  
pp. 224-229 ◽  
Author(s):  
Potjanaporn Chaengchawi ◽  
Karn Serivalsatit ◽  
Pornapa Sujaridworakun
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Precipitation Method ◽  
Cds Nanoparticles ◽  
Methylene Blue Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Blue Solution ◽  
Scanning Electron

A visible-light responsive CdS/ZnO nanocomposite photocatalyst was successfully synthesized by precipitation of CdS nanoparticles, using Cd (NO3)2 and Na2S as starting materials, on ZnO nanoparticles and then calcined at 400°C for 2 hours. The effects of the mole ratio of CdS and ZnO in the composites on their phase, morphology, and surface area were investigated by X-ray Diffraction (XRD), scanning electron microscope (SEM), Brunauer Emmett Teller method (BET), respectively. The photocatalytic degradation of methylene blue solution in the presence of composite products under visible-light irradiation was investigated. The results showed that the mole ratio of CdS and ZnO played a significant role on photocatalytic performance. The highest photocatalytic activity was obtained from the CdS/ZnO nanocomposite with mole ratio of 1:4, which is higher than that of pure CdS and pure ZnO.

scholarly journals Photocatalytic Hydrogen Production from Glycerol Aqueous Solution Using Cu-Doped ZnO under Visible Light Irradiation

2019 ◽  
Vol 9 (13) ◽  
pp. 2741 ◽  
Author(s):  
Vincenzo Vaiano ◽  
Giuseppina Iervolino
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Noble Metals ◽  
Light Irradiation ◽  
Precipitation Method ◽  
Glycerol Solution ◽  
Glycerol Concentration ◽  
Photocatalytic Hydrogen Production ◽  
Doped Zno

Cu-doped ZnO photocatalysts at different Cu loadings were prepared by a precipitation method. The presence of Cu in the ZnO crystal lattice led to significant enhancement in photocatalytic activity for H2 production from an aqueous glycerol solution under visible light irradiation. The best Cu loading was found to be 1.08 mol %, which allowed achieving hydrogen production equal to 2600 μmol/L with an aqueous glycerol solution at 5 wt % initial concentration, the photocatalyst dosage equal to 1.5 g/L, and at the spontaneous pH of the solution (pH = 6). The hydrogen production rate was increased to about 4770 μmol/L by increasing the initial glycerol concentration up to 10 wt %. The obtained results evidenced that the optimized Cu-doped ZnO could be considered a suitable visible-light-active photocatalyst to be used in photocatalytic hydrogen production without the presence of noble metals in sample formulation.

The Preparation of C, N, S Tri-Doped TiO2 and Visible-Light Photo-Degradation of Methylene Blue and Dyes

2011 ◽  
Vol 287-290 ◽  
pp. 1735-1743 ◽  
Author(s):  
Yi Dong Shi ◽  
Qiong Guo ◽  
Yuan Song Xie
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Degradation Rate ◽  
Raw Material ◽  
Precipitation Method ◽  
Light Sources ◽  
Visible Absorption ◽  
Photo Degradation ◽  
X Ray

The C, N, S tri-doped TiO2 with high visible-light photo-catalysis effect was successfully prepared by mixing thiourea with the self-prepared TiO2 powder through calcining for 2h at 450°C. The TiO2 powder was obtained by homogeneous precipitation method using the metatitanic acid instead of expensive chemical reagents contained Ti as raw material. The effect of doping materials and methods on the photo-degradation rate of methylene blue and dyes was studied. The characterizations of the doped TiO2 were analyzed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-visible absorption spectra (UV-vis). The results showed that this sample was the anatase TiO2 and contained elements C, N, S. The sample exhibited a significant response to ultraviolet and visible light. In the photo-degradation experiment, the C, N, S, tridoped-TiO2 could decolorize methylene blue and textile dyes quickly, and the photo-degradation rate of methylene blue could reach upward 98% after 3 hours under the different light sources.

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