Green Synthesis of ZnO/Dy/NiO Heterostructures for Enhanced Photocatalytic Applications

2020 ◽  
Vol 1 (1) ◽  
pp. 30-36
Author(s):  
Shubha Jayachamarajapura Pranesh ◽  
Diwya Lanka
Keyword(s):  
Visible Light ◽  
Uv Light ◽  
Combustion Method ◽  
Hybrid Nanocomposites ◽  
Synthetic Dyes ◽  
Hybrid Nanostructure ◽  
Wide Range ◽  
Visible Light Active ◽  
Textile Industries ◽  
Photocatalytic Applications

Background: Textile industries discharge harmful synthetic dyes to nearby water sources. These colour effluents should be treated before discharge to reduce the toxicity caused by synthetic colours. Objective: To synthesize visible light active superstructures to reduce water pollution caused by textile industries. Methods: We have successfully synthesized ZnO/Dy/NiO hybrid nanocomposites using waste curd as fuel by a simple combustion method. The obtained material was able to reduce recombination and enhanced the photocatalytic degradation of organic pollutants. The as-synthesized material was characterized by XRD, absorption spectroscopy, FESEM, EDAX, etc. The obtained hybrid nanostructure was used as a photocatalyst for the degradation of methylene blue under sunlight, UV light as well as in dark. Comparative experiments were carried out with a variation of catalytic load, pH, dye concentrations, etc. for a better understanding of the performance of the catalyst at various conditions. Results and Conclusion: The ternary compound shows wide range of absorption by expanding absorption band both in UV and visible regions. ZnO/Dy/NiO hybrid nanocomposites performed well and showed uniqueness in the activity uder visible light.

Hybrid Energy Conversion and Storage (HECS) Cells of the Composite Materials between Visible-Light Active Co(OH)2and UV-Light Active Ni(OH)2

2018 ◽  
Vol 85 (13) ◽  
pp. 1203-1217 ◽  
Author(s):  
Ketsuda Kongsawatvoragul ◽  
Saran Kalasina ◽  
Montakan Suksomboon ◽  
Nutthaphon Phattharasupakun ◽  
Juthaporn Wutthiprom ◽  
...  
Keyword(s):  
Composite Materials ◽  
Visible Light ◽  
Energy Conversion ◽  
Uv Light ◽  
Hybrid Energy ◽  
Energy Conversion And Storage ◽  
Visible Light Active ◽  
And Storage

Quantum dots in photocatalytic applications: efficiently enhancing visible light photocatalytic activity by integrating CdO quantum dots as sensitizers

2017 ◽  
Vol 19 (36) ◽  
pp. 24915-24927 ◽  
Author(s):  
A. H. Reshak
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Optical Band Gap ◽  
Visible Light Active ◽  
Photocatalytic Applications ◽  
Visible Light Photocatalytic

The amalgamation of a wide optical band gap photocatalyst with visible-light-active CdO quantum dots (QDs) as sensitizers is one of the most efficient ways to improve photocatalytic performance under visible light irradiation.

Improved visible light photocatalytic activity of rGO–Fe3O4–NiO hybrid nanocomposites synthesized byin situfacile method for industrial wastewater treatment applications

2018 ◽  
Vol 42 (6) ◽  
pp. 4372-4383 ◽  
Author(s):  
Shanmugam Mahalingam ◽  
Young-Ho Ahn
Keyword(s):  
Wastewater Treatment ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Industrial Wastewater ◽  
Hybrid Nanocomposites ◽  
Synthetic Dyes ◽  
Dye Wastewater ◽  
Hybrid Nanocomposite ◽  
Visible Light Photocatalytic

In situsurfactant free synthesis of rGO–Fe3O4–NiO hybrid nanocomposite for improving photocatalytic degradation of synthetic dyes (MR and CV) and real industrial dye wastewater.

scholarly journals An Emerging Visible-Light Organic–Inorganic Hybrid Perovskite for Photocatalytic Applications

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 115 ◽  
Author(s):  
Bianca-Maria Bresolin ◽  
Samia Ben Hammouda ◽  
Mika Sillanpää
Keyword(s):  
Visible Light ◽  
The Novel ◽  
Lead Iodide ◽  
Photo Degradation ◽  
Visible Light Photocatalyst ◽  
Hybrid Perovskite ◽  
Light Activity ◽  
Visible Light Active ◽  
Methylammonium Lead Iodide ◽  
Photocatalytic Applications

The development of visible-light active photocatalysts is a current challenge especially energy and environmental-related fields. Herein, methylammonium lead iodide perovskite (MAIPb) was chosen as the novel semiconductor material for its ability of absorbing visible-light. An easily reproducible and efficient method was employed to synthesize the as-mentioned material. The sample was characterized by various techniques and has been used as visible-light photocatalyst for degradation of two model pollutants: rhodamine B (RhB) and methylene-blue (MB). The photo-degradation of RhB was found to achieve about 65% after 180 min of treatment. Moreover, the efficiency was enhanced to 100% by assisting the process with a small amount of H2O2. The visible-light activity of the photocatalyst was attributed to its ability to absorb light as well as to enhance separation of photogenerated carriers. The main outcome of the present work is the investigation of a hybrid perovskite as photocatalyst for wastewater treatment.

Synthesis and photocatalytic application of visible-light active β -Fe 2 O 3 /g-C 3 N 4 hybrid nanocomposites

2016 ◽  
Vol 187 ◽  
pp. 171-180 ◽  
Author(s):  
Konstantinos C. Christoforidis ◽  
Tiziano Montini ◽  
Elza Bontempi ◽  
Spyridon Zafeiratos ◽  
Juan Josè Delgado Jaén ◽  
...  
Keyword(s):  
Visible Light ◽  
Hybrid Nanocomposites ◽  
Photocatalytic Application ◽  
Visible Light Active

scholarly journals Visible-Light Active Nanomaterials for Environmental Remediation – A Mini Review

2021 ◽  
Vol 12 (2) ◽  
pp. 2535-2547
Keyword(s):  
Visible Light ◽  
Human Health ◽  
Environmental Remediation ◽  
Hazardous Substances ◽  
The Past ◽  
Surface Areas ◽  
Visible Light Active ◽  
Textile Industries ◽  
Further Development ◽  
Broad Overview

For the past few decades, industries like dyeing, paper, and textile industries have been releasing potentially hazardous substances which may affect human health. The majority of the pollutants present in water bodies comprise dyes. Although various traditional methods have been employed to treat wastewater from industries, recent advances in technology depict tapping of solar energy using visible light photocatalysts to remove toxic dyes hazardous to health. Nanomaterials have proved to enhance the properties of any material they are incorporated into, especially due to their increased surface areas in the case of catalysts, resulting in more interaction with the substrate. The uses of nanomaterials in photocatalytic degradation activities have also proven to increase degradation efficiencies. The present study is intended to provide a broad overview of the various contaminants, especially dyes, polluting the environment and the visible-light-active nanomaterials-related technologies available for their degradation. Further, the advantages of using such materials and technologies in improving the environment and human health will be discussed in detail, and the foundation for further development in this area will be highlighted.

scholarly journals Stable CuCrO2 nanoparticles - ZnO fibres p-n heterostructure system for effective photocatalytic activity

2019 ◽  
Vol 13 (2) ◽  
pp. 189-201 ◽  
Author(s):  
Elif Baylan ◽  
Hasan Akyildiz ◽  
Ozlem Yildirim
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Uv Light ◽  
Light Exposure ◽  
Band Gap Energy ◽  
Blue Dye ◽  
Nanoparticle Dispersion ◽  
K Value ◽  
Composite Photocatalyst ◽  
Visible Light Active

Heterostructured photocatalysts were fabricated by coupling electrospun n-type ZnO fibres and hydrothermally derived p-type CuCrO2 nanoparticles. The effect of the amount of CuCrO2 nanoparticles on the photocatalytic activity of the heterostructured photocatalyst was systematically investigated. The formation of the heterojunctions between the two semiconductors was revealed via detailed XRD, XPS, TEM and optical property measurements. The experimental results indicated that the optimal CuCrO2 amount in the composite photocatalyst was 1.0wt.% due to the optimum doping and surface coverage, higher absorption onset edge, larger absorption intensity and optimum band gap energy. This composite photocatalyst, fabricated by drop casting of CuCrO2 nanoparticle dispersion on ZnO fibres, displayed 30% higher rate constant (k) value compared to the pure ZnO fibres in the degradation of methylene blue dye molecules and reached 93.4% decomposition in 1 h under UV-visible light exposure. The obtained results are highly encouraging in comparison to only UV/light active p-n heterostructured photocatalysts previously reported in literature. Therefore, we believe that the proposed approach here opened the way for simple synthesis of highly-efficient visible light active heterostructured semiconductor photocatalyst systems.

scholarly journals Photocatalytic Reduction of CO2 to Methanol by Cu2O/TiO2 Heterojunctions

2021 ◽  
Vol 14 (1) ◽  
pp. 374
Author(s):  
S.-P. Cheng ◽  
L.-W. Wei ◽  
H.-Paul Wang
Keyword(s):  
Solar Energy ◽  
Visible Light ◽  
Uv Light ◽  
Light Exposure ◽  
Photocatalytic Reduction ◽  
Low Carbon ◽  
Mild Conditions ◽  
Photogenerated Electrons ◽  
Visible Light Active ◽  
Reduction Of Co2

The conversion of CO2 to low-carbon fuels using solar energy is considered an economically attractive and environmentally friendly route. The development of novel catalysts and the use of solar energy via photocatalysis are key to achieving the goal of chemically reducing CO2 under mild conditions. TiO2 is not very effective for the photocatalytic reduction of CO2 to low-carbon chemicals such as methanol (CH3OH). Thus, in this work, novel Cu2O/TiO2 heterojunctions that can effectively separate photogenerated electrons and holes were prepared for photocatalytic CO2-to-CH3OH. More visible light-active Cu2O in the Cu2O/TiO2 heterojunctions favors the formation of methanol under visible light irradiation. On the other hand, under UV-Vis irradiation for 6 h, the CH3OH yielded from the photocatalytic CO2-to-CH3OH by the Cu2O/TiO2 heterojunctions is 21.0–70.6 µmol/g-catalyst. In contrast, the yield of CH3OH decreases with an increase in the Cu2O fraction in the Cu2O/TiO2 heterojunctions. It seems that excess Cu2O in Cu2O/TiO2 heterojunctions may lead to less UV light exposure for the photocatalysts, and may decrease the conversion efficiency of CO2 to CH3OH.

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