Enhanced photocatalytic dye degradation and antibacterial activity of biosynthesized ZnO-NPs using curry leaves extract
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(2020) 5:29
ORIGINAL PAPER
Enhanced photocatalytic dye degradation and antibacterial activity of biosynthesized ZnO‑NPs using curry leaves extract with coconut water M. Satheshkumar1 · B. Anand1 · A. Muthuvel2 · M. Rajarajan3 · V. Mohana4 · A. Sundaramanickam5 Received: 10 September 2020 / Accepted: 28 October 2020 © Springer Nature Switzerland AG 2020
Abstract Nowadays, zinc oxide nanoparticle is ineluctable filler in medicinal and photocatalytic activities. A simple, non-toxic and green synthetic method has been used for synthesis of ZnO-NPs. Characterizations of ZnO-NPs were confirmed by UV–Vis spectroscopy, XRD, FT-IR, EDX analysis and FE-SEM. The XRD pattern reveals that the formation of hexagonal wurtzite structure with average crystallite size of 1.62 nm. FE-SEM images confirmed that the ZnO-NPs are irregular spherical in structure. EDX analysis clearly exhibit strong signal of Zn element and weak signal of O element. Different functional groups in the nanoparticles, curry leaves and coconut water were indicated by FT-IR analysis. Furthermore, the synthesized products were evaluated for photocatalytic activity against organic methylene blue dye and antibacterial activity. Graphic abstract
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Nanotechnology for Environmental Engineering
(2020) 5:29
Keywords Dye degradation · Antibacterial · Photocatalyst · ZnO-NPs · Curry leaves
Introduction Metal oxide nanoparticles including S nO 2, TiO 2, CuO and ZnO represent a new class of significant nanomaterials that are increasingly being utilized in health and food processing applications [1]. Among the metal nanoparticles, zinc oxide nanoparticles (ZnO-NPs) have wide range of band gap (3.37 eV) which gained numerous interests because of their potential to photodegrade and photo-oxidize biological and chemical species [2, 3]. ZnO-NPs have many applications like electronics, optics, environmental protection, solar cells, nanomedicine, pharmaceuticals, catalysts and cosmetics along with its antifungal, acaricidal, antibacterial, anti-diabetic, pediculocidal and larvicidal activities [4]. The ZnO-NPs have broad spectrum of antibacterial and catalytic degradation efficacy than the micro-sized ZnO due to large surface area [5]. A wide variety of physicochemical methods have been used to fabrication of ZnO-NPs, such as sol–gel [6], ultrasound [7], hydrothermal synthesis [8], thermal decomposition [9] and homogeneous precipitation [10]. However, these fabric methods have some disadvantages owing to the involvement of toxic chemicals and solvents [11]. Recently, green routes have become popular among researchers due to its biocompatibility, environment friendly approach, and cost effectiveness [12]. Plant and their associated materials are used for the synthesis of stable nanomaterials for largescale production [13]. To date, several researches have been carried out on ZnO-NPs synthesis by plants such as Eucalyptus globules [14], Cassia fistula [15],
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