Visible light facilitated degradation of alternate dye solutions by highly reusable Mn-ZnO nano-photocatalyst

Keeping the industrial viability in view, manganese incorporated zinc oxide nanocomposites (Mn-ZnO NCs) was synthesized as a reusable photocatalyst. The photocatalytic efficiency of Mn-ZnO NCs was compared with ZnO nanoparticles. Morphology and size of the samples were modulated using sodium dodecyl...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-06, Vol.867, p.158870, Article 158870
Main Authors: Basnet, Parita, Samanta, Dhrubajyoti, Chanu, T. Inakhunbi, Chatterjee, Somenath
Format: Article
Language:English
Subjects:
Catalytic activity
Crystallites
Dye mixture
Dyes
Electron paramagnetic resonance
Field emission microscopy
Fourier transforms
Infrared spectra
Manganese
Mass spectra
Mass spectrometry
Methylene blue
Mn-ZnO nanocomposites
Morphology
Nanocomposites
Nanoparticles
Optical properties
Parameter estimation
Photocatalysis
Photocatalysts
Photodegradation
Photoelectrons
Photoluminescence
Rhodamine
Sodium dodecyl sulfate
Sodium dodecyl sulphate
Surface properties
X ray spectra
Zinc oxide
Zinc oxides
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Summary:Keeping the industrial viability in view, manganese incorporated zinc oxide nanocomposites (Mn-ZnO NCs) was synthesized as a reusable photocatalyst. The photocatalytic efficiency of Mn-ZnO NCs was compared with ZnO nanoparticles. Morphology and size of the samples were modulated using sodium dodecyl sulphate (SDS) as the cappant. The crystallite size and crystalline parameters were estimated through X-ray diffraction spectra, while the adsorption of SDS on the samples was assessed through Fourier transform infrared spectra. Since the efficiency of any photocatalyst fundamentally depends upon its photo-physical and surface properties, UV-Visible, Photoluminescence, and Electron paramagnetic resonance spectroscopic techniques were used to access the optical properties while Field emission scanning electron microscopy was employed to deduce the morphology of the samples. Energy dispersive X-ray spectra and X-ray photoelectron spectra confirmed the elemental composition of the samples. The photocatalytic degradation of dye solutions was monitored initially through UV-Vis spectra. In order to confirm that the final products of photocatalytic degradation were non-toxic, Mass spectrometry was employed to estimate the types of intermediates and final products formed during and after the course of photocatalytic reaction. The results of visible light assisted photocatalytic degradation studies indicated that Mn-ZnO NCs were highly reusable for degrading alternate solutions of dyes (rhodamine B and methylene blue) as well as their mixture within a span of only 20 min. The difference in the morphology of Mn-ZnO NCs before and after performing the photocatalytic activity was also assessed. [Display omitted] •Room temperature assisted synthesis of SDS capped ZnO and Mn-ZnO nanocomposites.•Morphology of ZnO tuned upon Mn incorporation.•Photostability of Mn-ZnO photocatalyst for alternate dyes degradation.•Efficient degradation of mixed dye solutions by Mn-ZnO nanocomposites•Non-toxic end-products of photodegradation estimated using ESI-MS spectrometry
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.158870