A facile microwave-assisted reaction was used to synthesize graphene oxide with cerium oxide nanoparticles (GO-CeO2 NPs) from water extracts of Moringa oleifera flower. The one step microwave synthesis treatment was used for reduction of ceria atom to cerium oxide nanoparticles along with the reduction of graphene oxide. The synthesized GO-CeO2 NPs were analysed by various analytical instrumentation techniques and we found the size of nanoparticles as 50 nm with a spherical shape. Further, the green synthesized GO-CeO2 NPs were employed as a catalyst to reduce 4-nitrophenol and achieved a degradation rate of 95.45%. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

Murugan V

Department of Mathematics

School of Advanced Sciences

Vellore Campus

Mohana Roopan S

Department of Chemistry

Anand K

Surendra T.V

Chuturgoon A.A

Muniyasamy S.

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

Journal of Inorganic and Organometallic Polymers and Materials

Biosynthetic methods are alternative approaches which are much safer than the normal techniques (physical and chemical) used for the methods for synthesis of metal nanoparticles. The benefits are sample as it is economic and environment friendly. Herein present investigation, we have reported a microwave mediated eco-friendly synthetic approach for preparing cerium oxide (CeO2) nanoparticles. Here, we used Moringa oleifera peel as the stabilizing and reducing agent towards synthesize of Ce2O NPs via microwave irradiation. The NPs were further characterized using UV-Vis, FT-IR, XRD and HR-TEM techniques. The FTIR analysis confirmed the phytochemical involvement in NPs stabilization. The crystallinity of CeO2 nanoparticles are well demonstrated through X-ray Diffraction and HR-TEM. The TEM images reveal the spherical shape of the CeO2 NPs having an average size of 45nm. Additionally, these CeO2 NPs were used successfully as a catalyst in the degradation of the dye, crystal violet. Also the antibacterial activity of the synthesized CeO2 NPs was evaluated using Staphylococcus aureus (Gram positive bacteria) and Escherichia coli (Gram negative bacteria). CeO2 NPs showed better activity on E. coli than S. aureus. We have demonstrated an eco-friendly preparation of CeO2 nanoparticles, a good photocatalyst and having better antibacterial properties.

Journal of Photochemistry and Photobiology B: Biology

Photocatalytic and antibacterial properties of phytosynthesized CeO2 NPs using Moringa oleifera peel extract

Maximum pollutants in the industrial and domestic waste water effluents from any sources include pathogens and organic chemicals, which can be removed before discharging into the water bodies. Methylene blue has been considered as one of the major water contaminated pollutants. Such pollutant is dominant in surface water and groundwater. It will cause irreversible hazards to human and aquatic life. Nanotechnology plays a major role in degrading such type of pollutant. In order to fulfill today's requirement, we have decided to handle the green synthesis of nanoparticles and its application by merging important fields like chemistry, environmental science, and biotechnology. Here our work emphasizes on the biological synthesis of SnO2 nanoparticles (SnO2 NPs) using the methanolic extract of Cyphomandra betacea (C.betacea), and it was confirmed by various characterization techniques such as UV-visible spectroscopy, FT-IR, XRD, SEM, particle size analyzer, zeta potential, and TEM. The obtained results stated that the synthesized SnO2 NPs were in rod shape with an average size of 21nm, which resulted in a product of nanobiotechnology. Further, we have utilized the environmental-friendly synthesized SnO2 NPs photocatalytic degradation of environmental concern methylene blue with first-order kinetics. In this paper, we have attempted to prove that secondary metabolite-entrapped SnO2 NPs are non-toxic to the environment.

Efficacy of SnO 2 nanoparticles toward photocatalytic degradation of methylene blue dye

Tin oxide (SnO2) nanoparticles were prepared using Persia Americana seed methanolic extract by calcining stannous chloride precursors at 300-500 °C by green synthesis method. Synthesized SnO2 NPs were confirmed via characterization techniques such as UV-visible spectroscopy (UV), X-ray diffraction (XRD), Scanning Electron Microscope (SEM) and Energy Dispersive X-ray analysis (EDAX). The results of characterization technique states that the synthesized nanoparticles were in the size of 4 nm and further we have undergone catalytic degradation of organic dye named phenolsulfonphthalein (phenol red). The result showed that SnO2 NPs shows much degradation activity by the catalytic action of long UV exactly at 365 nm. © 2015 Elsevier B.V. All rights reserved.

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

Green synthesis of SnO 2 nanoparticles and its photocatalytic activity of phenolsulfonphthalein dye

Most of researcher focused their research towards synthesize of nanoparticles by the method of applied chemical method which was one of the costliest method. We have focused cheapest and simplest method for the synthesizing of lead nanoparticles (Pb-NPs) using cocos nucifera L extract. The methanolic extract of cocos nucifera L was efficiently used as a reducing agent for synthesizing Pb-NPs. On treatment of lead acetate with cocos nucifera coir extracts, stable Pb-NPs were formed. The synthesized Pb-NPs were further confirmed by UV-visible spectroscopy, X-ray diffraction (XRD), Transmission electron microscope (TEM) and Energy Dispersive (EDAX) analysis. The secondary metabolites present in methanolic extract which can mainly act as a reducing and capping agents for the formation of Pb-NPs were identified by GC-MS. Anti-microbial activity for Pb-NPs against four pathogenic strain's such as Staphylococcus aureus, Escheria coli, Staphylococcus epidermis and Bacillus subtilis. Result states that Pb-NPs size was 47 nm and also shows good activity against S. aureus. Further we report on photocatalytic absorption of malachite green dye processed in short UV wavelength at 254 nm. UV spectral analysis showed peak absorbance at 613 nm with special reference to the excitation of surfaces plasmon vibration by Pb-NPs.

Green synthesis, spectroscopic investigation and photocatalytic activity of lead nanoparticles

Palladium chemistry has grown into an extremely powerful strategy for C-C bond formation. The reported methodology is based on the eco-friendly synthesis of palladium nanoparticles (PdNPs) obtained from the methanolic extract of Carissa carandas (C. carandas) fruit extract. The synthesized PdNPs were characterized by UV-Vis spectroscopy, FTIR, SEM, TEM, XRD, zeta potential and particle size analyzer. The synthesized PdNPs were applied in Suzuki Miyaura Coupling reaction and further it was subjected to its toxicity assessment against the species of Artemia salina. The synthesis was carried out by both conventional and non-conventional methodology. The yield comparison was performed based on the amount of catalyst and condition. The catalytic efficiency and recyclability of the nanoparticles were performed. The post-synthesis comparative analysis on the quality of reaction based on E-factor and Eco-Scale to paramount its impact on the ecological friendliness.

Journal	Data powered by TypesetJournal of Inorganic and Organometallic Polymers and Materials
Publisher	Data powered by TypesetSpringer Science and Business Media LLC
ISSN	1574-1443
Open Access	No