Abstract
In this work, we have synthesized Mn-doped SnO2@ZnO nanocomposite for photo degradation of Methylene blue and Rhodamine B dyes upon visible light irradiation. The crystal structure, functional group, optical absorption, defect related emission, morphology, purity and binding energy state of synthesized samples were identified by using various analytical tools. The crystal structure revealed the rutile tetragonal, hexagonal wurtzite for SnO2 and ZnO samples and the average crystal sizes were found in the range of 23.3 nm to 16.7 nm for the synthesized samples. The optical absorption peaks were shifted to higher wavelength side and optical band gap values were found between 3.52 eV and 2.77 eV which confirm the formation of hetero-junction of SnO2@ZnO composites. The field emission scanning electron spectroscopy (FESEM) revealed the spherical grain morphology for pure and composite samples. The energy dispersive spectra (EDS) and element mapping confirms the purity of the synthesized samples. The X-ray photoelectron spectroscopy (XPS) revealed that the composition and energy state of Mn4+, Sn4+ and Zn2+ for composite samples. The photocatalytic degradation results clearly indicate that the Mn-doped SnO2@ZnO nanocomposite has higher degradation efficiency of 98% and 92% for the Methylene blue and Rhodamine B dyes, respectively and is higher than the other synthesized samples. The present study reveals a low cost and highly efficient photo-catalyst which works up on visible light irradiation for the purification of waste water from industries.
Highlights
In the present digital era, the energy shortage and the environmental related problems are the two main issues of the livegoods of the modern society
The researchers have focused on developing the low cost, low maintenance and high efficient photocatalysts which work upon solar or visible light irradiation to give pollution free water
In the past three decades, the inorganic metal-oxide (TiO2, SnO2, CuO, WO3 and ZnO, etc) based semiconducting materials have propelled a great attention in the field of photocatalysis due to their high catalytic behavior and stability [4,5,6,7]
Summary
License: This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License Version of Record: A version of this preprint was published at Journal of Materials Science: Materials in Electronics on August 3rd, 2021. See the published version at https://doi.org/10.1007/s10854-02106692-x. VISIBLE LIGHT INDUCED PHOTOCATALYTIC PERFORMANCE OF Mn-SnO2@ZnO NANOCOMPOSITE FOR HIGH EFFICIENT CATIONIC DYE DEGRADATION S. Asaithambi1,2, P. Sakthivel1, M. Karuppaiah1, V. Balaji1, R.Yuvakkumar1, G. Ravi1*
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