Electrochemical synthesis of novel aluminium oxyhydroxide-decorated MnO 2 /chitosan nanocomposite with efficient photoca
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ORIGINAL PAPER
Electrochemical synthesis of novel aluminium oxyhydroxide‑decorated MnO2/chitosan nanocomposite with efficient photocatalytic and antibacterial activity Saima Sultana1 · Nafees Ahmad1,2 · Ees Ahmad3 · Suhail Sabir1 · Mohammad Zain Khan1 Received: 14 April 2020 / Accepted: 24 July 2020 / Published online: 25 August 2020 © Springer Nature Switzerland AG 2020
Abstract Manganese oxide/chitosan/aluminium oxyhydroxide (MnO2/C/Al(O)OH) was synthesized by the electrochemical deposition method and characterized by standard analytical techniques. Fourier-transform infrared spectroscopy was used to study the functional group analysis and X-ray diffraction to determine particle size and crystallinity. Morphological studies of the nanocomposites were studied by scanning electron microscope coupled with energy-dispersive spectroscopy and transmission electron microscopy. The surface area of the synthesized materials was calculated by cyclic voltammetry, and the thermal properties were studied by thermogravimetric analysis and differential thermal analysis. The photocatalytic activity of the as-prepared nanocomposite was performed against the degradation of acid navy blue R (ANB) under the influence of visible light irradiation. The resultant nanocomposite exhibits appreciable photodegradation of ANB dye which is due to higher charge separation and formation of reactive oxygen species. The charge ( e−, h+) separation properties of the nanocomposites were studied by fluorescence spectroscopy. Recycling experiment was performed to check the stability of the photocatalyst. Moreover, antibacterial nature of the prepared materials has also been examined against gram-positive and gram-negative strains using the broth dilution as well as disc diffusion method and efficient result of antibacterial test is obtained.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s41204-020-00083-z) contains supplementary material, which is available to authorized users. * Mohammad Zain Khan [email protected] 1
Environmental Research Laboratory, Department of Chemistry, Aligarh Muslim University, Aligarh 202 002, India
2
School of Water, Energy and Environment, Cranfield University, Bedford MK43 0AL, UK
3
Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh 202002, India
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Nanotechnology for Environmental Engineering (2020) 5:20
Graphic abstract
Keywords Nanocomposite · Photocatalyst · Electrochemical · Visible light · Acid navy blue · Antibacterial
Introduction Water pollution has become serious threat to the environment due to rapid industrialization and discharge of unwanted material directly to the water bodies. The unwanted waste materials from textiles, pharmaceuticals, petrochemicals, fertilizer industries, etc., are directly discharged into the water streams which are quite carcinogenic and toxic in nature [1–3]. Discharge of these organic
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pollutants l
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