Microwave-Assisted Synthesis of Mushrooms Like MWCNT/SiO 2 @ZnO Nanocomposite: Influence on Nematic Liquid Crystal E7 an
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Microwave‑Assisted Synthesis of Mushrooms Like MWCNT/SiO2@ZnO Nanocomposite: Influence on Nematic Liquid Crystal E7 and Highly Effective Photocatalytic Activity in Degradation of Methyl Blue Hasan Eskalen1 · Serhan Uruş2 · Şükrü Özgan3 Received: 2 July 2020 / Accepted: 24 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Mostly-uniform spherical mushrooms like MWCNT/SiO2@ZnO nanocomposite was synthesized under microwave power and characterized using TEM, XRD, EDX, TG/DTA and FT-IR techniques. The modified chemical process was used in three steps for the synthesis of the nanocomposite. Having a nano-capillary structure of MWCNT as nano-core, chemically and physically inert silica cover are a vital backbone for ZnO, which is a semiconductor. Because of the excellent chemical and physical properties of MWCNT/SiO2@ZnO nanocomposite, it has shown unique catalytic properties in the photocatalytic degradation of methyl blue. Approximately all of the methyl blue was degraded in water in 10 min. under sun-light and after 60 min., rarely left from dye in the water. The thermal and electrical behavior of mushrooms like nanocomposite doped E7 was investigated. According to the obtained results, the nematic to isotropic phase transition temperature of sample enhanced with nanocomposite dispersion and threshold voltage of mushroom like nanocomposite doped Nematic Liquid Crystal E7 decreased was founded. Graphic Abstract Methyl Blue O2
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O22-
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CB
2 2
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H2O
VB
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OH ZnO SiO2
Keywords ZnO · Carbon nanotube · Liquid crystal · Photocatalysis · Methyl blue
1 Introduction * Serhan Uruş [email protected] Extended author information available on the last page of the article
The usage of synthetic dyes is exponentially increasing day by day. However, the synthetic dyes can remain stable in water samples even in aerobic waste treatment
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processes that cause the pollution of the environment because of their chemical structure against physical and chemical effects. Nowadays, the photocatalytic degradation of organic pollutants in water without using any oxidant in daylight has been studied [1–6]. The organic dyes can be degraded with a light source using a photocatalyst. Besides, semiconductors like ZnO and TiO2 have chemical and physical stability in even severe conditions in photocatalysis. The nano-core MWCNT is a unique supporting material because of the sizeable nano-capillary area for the controlled precipitation of a solid material such as silica-gel. Additionally, S iO 2 covering on a nano-core gives important features because of its unique chemically and physically stability in severe chemical and physical conditions. The photocatalyst having a small bandgap like a semiconductor gives unique properties in the oxidation of an organic pollutant because of electron mobility with the excitation and thus obtaining active radicallic oxygen species. ZnO is known as an n-type semiconductor with a wide bandgap (3.37 eV). ZnO can show excellent p
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