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Your search keyword '"ZnO/Graphene composite"' showing total 2 results
Start Over Descriptor "ZnO/Graphene composite" Topic graphene
2 results on '"ZnO/Graphene composite"'

1. ZnO/Graphene Composite from Solvent-Exfoliated Few-Layer Graphene Nanosheets for Photocatalytic Dye Degradation under Sunlight Irradiation.

Author

Venkidusamy, Vasanthi, Nallusamy, Sivanantham, Nammalvar, Gopalakrishnan, Veerabahu, Ramakrishnan, Thirumurugan, Arun, Natarajan, Chidhambaram, Dhanabalan, Shanmuga Sundar, Pabba, Durga Prasad, Abarzúa, Carolina Venegas, and Kamaraj, Sathish-Kumar

Subjects
PHOTODEGRADATION, GRAPHENE, NANOSTRUCTURED materials, ZINC oxide, METHYLENE blue
Abstract

ZnO/graphene nanocomposites were prepared using a facile approach. Graphene nanosheets were prepared by ultrasonication-based liquid phase exfoliation of graphite powder in a low boiling point organic solvent, 1,2-Dichloroethane, for the preparation of ZnO/graphene nanocomposites. Structural properties of the synthesized ZnO/graphene nanocomposites were studied through powder XRD and micro-Raman analysis. The characteristic Raman active modes of ZnO and graphene present in the micro-Raman spectra ensured the formation of ZnO/graphene nanocomposite and it is inferred that the graphene sheets in the composites were few layers in nature. Increasing the concentration of graphene influenced the surface morphology of the ZnO nanoparticles and a flower shape ZnO was formed on the graphene nanosheets of the composite with high graphene concentration. The efficiencies of the samples for the photocatalytic degradation of Methylene Blue dye under sunlight irradiation were investigated and 97% degradation efficiency was observed. The stability of the nanocomposites was evaluated by performing five cycles, and 92% degradation efficiency was maintained. The observed results were compared with that of ZnO/graphene composite derived from other methods. [ABSTRACT FROM AUTHOR]

Published
2023
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2. Highly efficient adsorbent for the transformer oil purification by ZnO/Graphene composite

Author

T. Tan Vu, The Vinh La, Van Tuan Pham, Minh Khoi Vu, Dang Chinh Huynh, and Ngoc Khiem Tran

Subjects
Pore size, Transformer oil, General Chemical Engineering, Composite number, Adsorbent, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, law.invention, lcsh:Chemistry, Adsorption, law, Specific surface area, Vacancy defect, Zeolite, Purification, Graphene, Chemistry, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, lcsh:QD1-999, Chemical engineering, ZnO/Graphene composite, 0210 nano-technology
Abstract

In this work, a highly efficient adsorbent consisting of the ZnO/Graphene composite was prepared for the first time via the sonification route using urea as an alkaline precursor. The synthesized ZnO/Graphene composite provides the highest specific surface area comparing to other ZnO/Graphene composites synthesized by different approaches presented in the literature. For all we know, this is the first time the obtained ZnO/Graphene composite was used as an adsorbent for the transformer oil purification. The results showed that the ZnO/Graphene composite has a higher purification capacity than the conventional adsorbent, a commercial zeolite. Several factors that may underpin this outstanding result, such as the unreduced oxygen functional groups, the vacancy defects on the surface of the RGO flake, the high specific surface area, and the suitable pore size of the ZnO/Graphene composite for oil refining. Besides, the 3D structure of the ZnO/Graphene composite can enlarge the residence purification time of the transformer oil, helping to improve the purification capacity of the ZnO/Graphene composite.

Published
2020
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