Abstract: Nanotechnology is a relatively new field which is making advancements each day. It is making a huge impact on our day-to-day lives. Nanoparticles possess unique properties which makes it viable to use it in a wide variety of fields such as in cosmetics, parasitology and catalysis. We used a plant-mediated, nature-friendly method which does not involve the usage of any harmful chemicals. Syzgium cumini seed extract was taken as the reducing agent for the preparation of zinc oxide nanoparticles. Green-synthesized zinc oxide nanoparticles were confirmed using X-ray diffraction, Fourier-transform infrared, UV–Vis spectroscopy, scanning electron microscope and transmission electron microscope. The average particle size was found to be around 50–60 nm. Additionally, larvicidal and ovicidal activity of the prepared nanoparticles against dengue causing vector was also carried out which resulted in LC50 and LC90 of 51.94 ppm and 119.99 ppm, respectively. Graphical abstract: [Figure not available: see fulltext.]/ © 2018, Islamic Azad University (IAU).

Mohana Roopan S

Department of Chemistry

School of Advanced Sciences

Vellore Campus

Mathew R.S

Mahesh S.S

Titus D

Aggarwal K

Bhatia N

Damodharan K.I

Elumalai K

Samuel J.J.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

International Journal of Environmental Science and Technology

Zinc oxide (ZnO) nanoparticles (NPs) are important materials when making different products like sun screens, textiles, and paints. In the current study, the photocatalytic effect of prepared ZnO NPs from Moringa oleifera (M. oleifera) was evaluated on degradation of crystal violet (CV) dye, which is largely released from textile industries and is harmful to the environment. Preliminarily, ZnO NP formation was confirmed using a double beam ultraviolet visible (UV-Vis) spectrophotometer; further, the NP size was estimated using XRD analysis and the functional group analysis was determined using Fourier transform infrared (FT-IR) spectroscopy. The morphology of the synthesized NPs was found to be a hexagonal shape using SEM and TEM analysis and elemental screening was analyzed using EDX. ZnO NPs were shown sized 40–45 nm and spherical in shape. The degradation percentage of ZnO NPs was calculated as 94% at 70 min and the rate of the reaction –k = 0.0282. The synthesized ZnO NPs were determined for effectiveness on biological activities such as antifungal, hemolytic, and antibacterial activity. ZnO NPs showed good antifungal activity against Alternaria saloni and Sclerrotium rolfii strains. Further, we have determined the hemolytic and antibacterial activity of ZnO NPs and we got successive results in antibacterial and hemolytic activities. © 2016, The Author(s).

Fulltext

Nanoscale Research Letters

Vegetable Peel Waste for the Production of ZnO Nanoparticles and its Toxicological Efficiency, Antifungal, Hemolytic, and Antibacterial Activities

Currently phytochemical approach for the synthesis of metal nanoparticles plays a major role. In this manuscript phytochemical synthesis of Ni-Pd bi-metallic nanoparticles (Ni-Pd NPs) were subjected for various biological applications like pesticidal, larvicidal and ovicidal activities. The synthesized Ni-Pd NPs were confirmed by various characterization techniques, The XRD pattern confirms the formation of Ni-Pd NPs in purest crystalline form and it matches with the Joint Committee Powder Diffraction Standard data of JCPDS: 65-5788. The crystalline sizes of bi-metallic nanoparticles were found to be 33 nm which is calculated from Scherrer equation. TEM images clear cuts the spherical particle of Pd NPs with over layered by Ni NPs. The TEM histogram analysis helps to find the average particle size of Ni-Pd NPs as 34 ± 2 nm. The EDAX spectrum also confirms the presence of palladium and nickel atom. Further the synthesized bi-metallic nanoparticles were subjected for larvicidal activity against Aedes aegypti (A. aegypti) which resulted in LC50 and LC90 of 288.88 ppm and 483.06 ppm respectively. Also in this manuscript phyto-synthesized Ni-Pd NPs were subjected to antifeedant activity against Callosobruchus maculatus (C. maculatus) and ovicidal activity against eggs of C. maculatus were performed. © 2016

Journal of Molecular Liquids

Coir mediated instant synthesis of Ni-Pd nanoparticles and its significance over larvicidal, pesticidal and ovicidal activities

The use of plant extract to synthesize nanoparticle has been considered as one of the eco-friendly method. Additionally, it is a strong alternate for conventional methods which includes chemical and physical approach. In this study, microwave assisted extraction of Carissa edulis (C. edulis) at 70 °C and 400 W was used to extract the secondary metabolites. Further, the metabolites were used as capping agent and Zn (NO3)2 as the metal precursor to synthesize ZnO nanoparticles (ZnO NPs). UV–Vis spectroscopy, FT-IR, XRD, SEM and HR-TEM were used for the characterization of nanoparticles. The Surface Plasmon Resonance around 358 nm from the UV–Vis spectroscopy result represents the ZnO NPs formation. The FT-IR confirms the presence of functional groups that acts as the capping agent for the synthesis of ZnO NPs. The crystalline structure of nanoparticles is revealed in the XRD result, morphology showed by SEM results and the size of the ZnO NPs were predicted by HR-TEM. We have carried out the photocatalytic degradation of Congo red at 365 nm in photo reactor using ZnO NPs. The result from the photocatalytic degradation Congo red showed rate constant is (− k) 0.4947 with 97{\%} of degradation. This is our first attempt on the C. edulis extract on ZnO NPs preparation and Congo red dye degradation revels that ZnO NPs exhibit good photocatalytic property.

Journal of Photochemistry and Photobiology B: Biology

Photocatalytic degradation of Congo red using Carissa edulis extract capped zinc oxide nanoparticles

The physicochemical methods of the synthesis of zinc nanoparticles (ZnO NPs) and some detailed studies on ZnO toxicity mechanism and biokinetics have been reported. However, some of these physical and chemical methods of synthesis are expensive and can also have toxic substances absorbed onto them. Hence, eco-friendly synthesis of nanoparticles due to their easier process, cheaper availability, and high stability is dominating new research. In particular, ZnO NPs which are now being synthesized through major biological systems involved in this are bacteria, fungi, and plant extracts; this has increased studies in various applications in the biological field. In this review, we have elaborated on various natural source-mediated syntheses of ZnO NPs and their role in various biological activities like antimicrobial, anticandidal, larvicidal, cytotoxic, and photocatalytic activities. Apart from these applications, ZnO NPs are also reported to help to prevent dust formation, for several years, on oil paintings. © 2015, Springer-Verlag Berlin Heidelberg.

Applied Microbiology and Biotechnology

Biotechnological aspects of ZnO nanoparticles: overview on synthesis and its applications

Nickel oxides nanoparticles (NiO NPs) were synthesized by biosynthesis method with the help of phytoconstituents present in the neem leaf. Further the synthesized NiO NPs were subjected for structural, optical, morphological and magnetic properties. The XRD patterns clearly infer the presence of polycrystalline nature of samples (0 1 0), (0 1 1) and (0 1 2) with hexagonal crystal phase. Morphological studies using Transmission Electron Microscope (TEM) reveals that the biosynthesized NiO NPs were in shape of oblong with 12 nm in size. Elemental analysis (EDAX) confirms the quantity of Ni is present at 51% and remaining O as 49% as well as the mass magnetization values of 61 emu/g are also recorded for NiO NPs and its coercivity values in the range of 0.2–0.4 of nanoparticles respectively. Finally the NiO NPs was studied for bacterial activity against Staphylococcus aureus (MTCC 1430) and followed by Escherichia coli (MTCC 739) by agar diffusion assay. © 2016 The Authors

Journal	Data powered by TypesetInternational Journal of Environmental Science and Technology
Publisher	Data powered by TypesetSpringer Science and Business Media LLC
ISSN	1735-1472
Open Access	0