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2022 | OriginalPaper | Chapter

ZnO Nanocomposites in Dye Degradation

Authors : M. V. Manohar, Amogha G. Paladhi, Siji Jacob, Sugumari Vallinayagam

Published in: Advanced Oxidation Processes in Dye-Containing Wastewater

Publisher: Springer Nature Singapore

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Abstract

Substances like dyes having substantial colouring capacity are used in textiles which releases the effluents into natural streams by evading waste water treatment. Pollution caused by such non-biodegradable dyes like making the water unfit for human activities, harming aquatic life, causing diseases in humans etc. has become the major concern. Advanced Oxidative Processes (AOPs) by photocatalysis are being employed to remove these dyes and bring a considerable reduction in the contamination. Various semiconductor nanoparticles are widely used for photocatalysed degradation of dyes, out of which ZnO nanoparticle is one of the effective catalysts for this purpose. ZnO is considered above all other metal oxides due to its stability, low cost, high photosensitivity and optical properties. ZnO is combined with metal, metal oxides etc. in order to overcome the recombination of generated charge carriers and increase its photocatalytic and sonocatalytic efficiency. ZnO is produced by several methods like hydrothermal synthesis, solvothermal synthesis, one step flaming process etc. Characterization and confirmation of the synthesized nanoparticles are carried out by techniques such as X-ray diffraction (XRD), UV–Visible analysis, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Raman Spectroscopy, Brunauer-Emmer-Teller (BET) technique, Field Emission Scanning Electron Microscopy (FE-SEM), Energy Dispersal X-ray analysis (EDX), Fourier-Transform Infrared (FTIR) spectroscopy Analysis, Energy Dispersal X-Ray spectroscopy (EDS) etc. Photocatalytic and sonocatalytic dye degradation depends on pH, size of the ZnO nanocomposite and calcination process. In this review different methods of ZnO synthesis, nanocomposite synthesis of ZnO with metals, characterization of the ZnO nanoparticles and dye degradation processes have been discussed.

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Metadata
Title
ZnO Nanocomposites in Dye Degradation
Authors
M. V. Manohar
Amogha G. Paladhi
Siji Jacob
Sugumari Vallinayagam
Copyright Year
2022
Publisher
Springer Nature Singapore
DOI
https://doi.org/10.1007/978-981-19-0882-8_12