Abstract
Current study delineates the synthesis and environmental applications of ZnO/CuO nanocomposite in photocatalysis and gas sensing. The ZnO/CuO nanocomposites (1:1, 1:2, and 2:1) were synthesized by a cost-effective and simple co-precipitation method. X-ray diffraction and high-resolution transmission electron microscopy investigation confirms the monoclinic crystal phase for the CuO and hexagonal wurtzite for ZnO in ZnO/CuO nanocomposites. The Raman spectroscopic analysis also revealed the monoclinic crystal phase for the CuO with C2h space group. The morphological features were explored by scanning electron microscopy. The successful synthesis of the ZnO/CuO nanocomposites with their very stable + II oxidation state is revealed by the X-ray photoelectron spectroscopy investigation. Optical properties and band gap measurements were explored by ultra-violet diffuse reflectance spectroscopy and the synthesized ZnO/CuO nanocomposite (1:1) was found to exhibit the direct band gap of 2.34 eV. The photocatalytic degradation by ZnO/CuO nanocomposite (1:1) was studied for the degradation of crystal violet (CV) dye. Nearly 90% photocatalytic degradation of CV dye was accomplished using this photocatalyst. The parameters like effect of pH, contact time, catalyst dose, kinetic study and scavenging study were investigated in the present study. The photocatalytic degradation products were analyzed by LC–MS analysis and fragmentation pathway has been depicted. Besides, the synthesized ZnO/CuO nanocomposites (1:1, 1:2, and 2:1) were studied as gas sensor for monitoring gases like LPG, ethanol, ammonia and NO2. ZnO/CuO nanocomposite was proved to be efficient ethanol gas sensor as compared to other tested gases.
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Acknowledgements
Authors are thankful to the management of the M. G. Vidyamandir, Nasik for providing the necessary research facilities. Authors are very thankful to KBC-NMU, Jalgaon for XRD and SEM results. Authors are gratefully acknowledge to IIT-Roorkee for XPS results, Savitribai Phule Pune University for Raman spectroscopy analysis, SAIF, Cochin University, Kerala for HR-TEM results and UV-DRS results. Authors are also sincerely acknowledged to NH-RDF, Chehadi, (Nashik) for LC-MS analysis. Authors are gratefully acknowledge to department of Physics and Department of Chemistry, Manmad, Nanochemistry research laboratory, Nandurbar, Department of Physics, SICES Degree College, Ambarnath, Thick and thin film laboratory, MSG College, Malegaon, Department of Chemistry, ACS College, Satana for providing necessary laboratory research facility.
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Shinde, R.S., Khairnar, S.D., Patil, M.R. et al. Synthesis and Characterization of ZnO/CuO Nanocomposites as an Effective Photocatalyst and Gas Sensor for Environmental Remediation. J Inorg Organomet Polym 32, 1045–1066 (2022). https://doi.org/10.1007/s10904-021-02178-9
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DOI: https://doi.org/10.1007/s10904-021-02178-9