scholarly journals Microwave-Assisted Synthesis of CuO Nanoparticles Using Cordia africana Lam. Leaf Extract for 4-Nitrophenol Reduction

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Aklilu Guale Bekru ◽  
Osman Ahmed Zelekew ◽  
Dinsefa Mensur Andoshe ◽  
Fedlu Kedir Sabir ◽  
Rajalakshmanan Eswaramoorthy
Keyword(s):  
Leaf Extract ◽  
Low Cost ◽  
Precious Metals ◽  
Cuo Nanoparticles ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Ph Values ◽  
Cuo Nps ◽  
Nitrophenol Reduction ◽  
Cordia Africana

Copper-oxide-based nanomaterials play an important role as a low-cost alternative to nanoparticles of precious metals for the catalytic reduction of 4-nitrophenols. In this study, CuO nanoparticles were synthesized by a microwave-assisted method using Cordia africana Lam. leaf extract for reduction or stabilization processes. The synthesized CuO nanoparticles (NPs) were characterized using X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). The analysis indicated that nanocrystals of the monoclinic CuO phase having a cluster of agglomerated morphology with a crystallite size of about 9 nm were synthesized. We also evaluated the catalytic performance of CuO NPs against 4-nitrophenol (4-NP) reduction. The catalyst has shown excellent performance completing the reaction within 12 min. Furthermore, the performance of CuO NPs synthesized at different pH values was investigated, and results indicated that the one synthesized at pH 7 reduced 4-NP effectively in shorter minutes compared to those obtained at higher pH values. The CuO NPs synthesized using Cordia africana Lam. leaf extract exhibited a better reducing capacity with an activity parameter constant of 75.8 min−1·g−1. Thus, CuO synthesized using Cordia africana Lam. holds a potential application for the catalytic conversion of nitroarene compounds into aminoarene.

scholarly journals Biosynthesis of copper(II) oxide nanoparticles using Murayya koeniggi aqueous leaf extract and its catalytic activity in 4-nitrophenol reduction

2019 ◽  
Vol 15 (2) ◽  
pp. 218-224 ◽  
Author(s):  
Mustaffa Shamsuddin ◽  
Nurulhuda Raja Nordin
Keyword(s):  
Leaf Extract ◽  
Low Cost ◽  
Precious Metals ◽  
Spherical Shape ◽  
Xrd Analysis ◽  
Oxide Nanoparticles ◽  
Catalytic Activities ◽  
Cuo Nps ◽  
Nitrophenol Reduction ◽  
Wide Range

Copper(II) oxide nanoparticles (CuO NPs) has a wide range of applications as catalysts. The natural abundance of copper and its relatively low cost make it a viable alternative to catalysts made from expensive precious metals such as platinum and palladium. In this study, a rapid, simple and green method was developed for the synthesis of CuO NPs using an aqueous extract of Murayya koenigii leaves. Several parameters were optimized, namely, the volume of leaf extract, pH, reaction temperature and reaction time. The optimum condition for the biosynthesis was obtained by using 3 mL of leaf extract; 10 mL of 5 mM CuSO, at pH 11, at room temperature.  The biosynthesis was completed within 50 minutes. The synthesized CuO NPs were characterized using Ultraviolet-visible Spectroscopy (UV-Vis), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and Transmission Electron Microscope (TEM) analyses. The UV-Vis absorption spectra confirmed the formation of CuO NPs with characteristic peak at 634 nm. The FTIR spectroscopic analysis of the biosynthesized CuO NPs confirmed the surface adsorption of the bioactive components in the leaf extract that acted as the reducing agent and stabilizing agent for the metal nanoparticles. XRD analysis showed a series of diffraction peaks at 2θ of 32.5°, 35.5°, 38.6°, 48.8°, 53.4°, 58.1°, 61.5°, 66.3°, 68.0°, 72.4° and 75.0°, corresponding to (110), (002), (111), (202), (020), (202), (113), (311), (220), (311) and (222) respectively. From TEM images, CuO NPs were of spherical shape with a mean diameter of 8.4 nm. The biosynthesized CuO NPs demonstrated good catalytic activities on the reduction 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of sodium borohydride, NaBH4 and can be reused three times without significant decrease in the catalytic activities

scholarly journals Microwave Assisted Synthesis of Dibenzo-[b,f][1,5]diazocine Derivatives for Photocatalytic Water Splitting Applications

2021 ◽  
Vol 33 (3) ◽  
pp. 627-631
Author(s):  
S.K. Cho ◽  
J.H. Jung ◽  
Y. Sissembayeva ◽  
J.H. Song ◽  
D.I. Jung ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Water Splitting ◽  
Noble Metals ◽  
Low Cost ◽  
Precious Metals ◽  
Microwave Assisted Synthesis ◽  
Reaction Conditions ◽  
Photocatalytic Water Splitting ◽  
Microwave Assisted ◽  
Hydrogen Molecules

Photocatalytic water splitting converts solar energy to storable hydrogen molecules which has the highest energy per mass. Most catalysts for photocatalytic water splitting utilize noble metals or precious metals. Organic photocatalysts are attracting more attention owing to several advantages like light weight, low cost, defined structure and tunability. In this study, the synthesis of several dibenzo[b,f][1,5]- diazocines via microwave irradiation for water splitting application is reported. Microwave irradiation facilitates fast, safe and simple synthesis in green reaction conditions. Mini library of dibenzo[b,f][1,5]diazocines were created in order to understand substituents effect on the photocatalytic activity.

scholarly journals Microwave Assisted Green Synthesis of Silver Nanoparticles using Pomegranate Peel Extract: Characterization and Antibacterial Activity Studies

2019 ◽  
Vol 32 (2) ◽  
pp. 458-462
Author(s):  
Gugulothu Yaku ◽  
Bandi Rajkumar ◽  
T.V.D. Prasad Rao
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Low Cost ◽  
Diffusion Method ◽  
Microwave Assisted Synthesis ◽  
Pomegranate Peel ◽  
Stabilizing Agent ◽  
X Ray ◽  
Microwave Assisted ◽  
Pomegranate Peel Extract

In the present work, a simple and low cost and eco-friendly technique is applied for the microwave assisted synthesis of silver nanoparticles (AgNPs) using the extract of pomegranate peel wastes, which does not require any use of external stabilizing agent. The extract of pomegranates peelings waste served as a reducing as well as capping/stabilizing agent. The synthesized silver nanoparticles were characterized by using powder X-ray diffraction (XRD), transmission eelectron microscopy (TEM), FT-IR, UV-visible spectroscopy and scanning electron microscopy-energy dispersive X-ray analysis (SEM-EDX). The stability of AgNPs was analyzed by zeta potential measurements. The antibacterial activity of synthesized AgNPs was also evaluated on six Gram-positive and Gram-negative bacteria using agar well diffusion method.

scholarly journals Microwave-Assisted Synthesis of Amikacin Modified N,S co-Doped Carbon Dots for Escherichia coli Detection

Chemosensors ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 61
Author(s):  
Fajar Amelia Rachmawati Putri ◽  
Mudasir Mudasir ◽  
Kinichi Morita ◽  
Suherman Suherman
Keyword(s):  
Escherichia Coli ◽  
Carbon Dots ◽  
Limit Of Detection ◽  
Low Cost ◽  
Microwave Assisted Synthesis ◽  
E Coli ◽  
Microwave Assisted ◽  
Average Size ◽  
Doped Carbon Dots ◽  
Co Doped

Fluorescent amikacin modified nitrogen, sulfur co-doped carbon dots (amikacin modified N,S-CDs) were synthesized by a facile and low-cost one-step microwave-assisted specifically for selective detection of Gram-negative bacteria Escherichia coli (E. coli). Amikacin is a semi-synthetic amino glycoside antibiotic and it was employed in this study to increase the fluorescence response of N,S-CDs by providing binding ligand towards E. coli. The effect of thiourea content as the source of nitrogen and sulfur dopants was investigated prior to the preparation of amikacin modified N,S-CDs. The formation of amikacin modified N,S-CDs were characterized by using Fourier transform infrared (FTIR), X-ray diffraction (XRD), Transmission electron microscope (TEM), UV-Vis spectrophotometer, and spectrofluorometer. Amikacin modified N,S-CDs was identified to be successfully synthesized from the wavenumber shift of the C=O stretching mode. Amikacin modified N,S-CDs were amorphous with an average size of 7 nm. Fluorescence spectra showed that the highest intensity was obtained at thiourea content of 50% and amikacin mass of 25 mg. By comparing fluorescence responses of all the investigated amikacin modified N,S-CDs, the limit of detection (LOD) was attained by 25 mg amikacin modified N,S-CDs at 1.526 cfu mL−1.

Tamarix gallica leaf extract mediated novel route for green synthesis of CuO nanoparticles and their application for N-arylation of nitrogen-containing heterocycles under ligand-free conditions

RSC Advances ◽  
2015 ◽  
Vol 5 (51) ◽  
pp. 40628-40635 ◽  
Author(s):  
Mahmoud Nasrollahzadeh ◽  
S. Mohammad Sajadi ◽  
Mehdi Maham
Keyword(s):  
Catalytic Activity ◽  
Green Synthesis ◽  
Leaf Extract ◽  
Cuo Nanoparticles ◽  
Aryl Halides ◽  
Cuo Nps ◽  
Ligand Free ◽  
Tamarix Gallica

We report the green synthesis of CuO nanoparticles (CuO NPs) using Tamarix gallica leaf extract and their catalytic activity for N-arylation of nitrogen-containing heterocycles with aryl halides under ligand-free conditions.

Effect of (Ag, Zn) co-doping on Structural, Optical and Bactericidal Properties of CuO Nanoparticles Synthesized by Microwave-assisted Method

2021 ◽  
Author(s):  
Naveen Thakur ◽  
Anu . ◽  
Kuldeep Kumar ◽  
Ashwani Kumar
Keyword(s):  
Copper Oxide ◽  
Synthesis Method ◽  
Cuo Nanoparticles ◽  
Microwave Assisted Synthesis ◽  
Co Doping ◽  
Microwave Assisted ◽  
Bactericidal Properties ◽  
Microwave Assisted Method ◽  
Co Doped

A microwave assisted synthesis method has been used for the fabrication of pure and (Ag, Zn) co-doped copper oxide (Cu1-x-yAgxZnyO) nanoparticles (NPs) with different weight ratios of zinc (0.00, 0.02,...

scholarly journals Microwave Synthesis of Silver Nanoparticles

Nano Hybrids ◽  
2013 ◽  
Vol 4 ◽  
pp. 99-112 ◽  
Author(s):  
Sonali Saha ◽  
M.M. Malik ◽  
M.S. Qureshi
Keyword(s):  
Ag Nanoparticles ◽  
Leaf Extract ◽  
Microwave Assisted Synthesis ◽  
Ag Nanoparticle ◽  
Microwave Assisted ◽  
Physical Chemical ◽  
Enzymatic Action ◽  
Green Route ◽  
Biological Methods ◽  
Xrd And Tem

In this work, a green route for synthesis of Ag nanoparticles is presensted. For the synthesis of Ag nanoparticles, tulasi leaf extract (Ocimum leaf) in combination with microwave irradiation was used which yielded stable spherical Ag nanoparticle in the range of 5-50 nm. Surface morphology of nanoparticle was analyzed by XRD and TEM. UV-Vis analysis was also carried out to characterize the synthesized nanoparticles. The main feature of the process is that it is carried out in a very short span of time in comparison to other conventional physical, chemical and biological methods. Microwave assisted synthesis suppresses the enzymatic action to keep the process easy, fast and eco-friendly.

scholarly journals Green Synthesis and Characterization of Crystalline CuO Nanoparticles using Aqueous Mentha Piperita L. Leaf Extract

2021 ◽  
Vol 20 (2) ◽  
pp. 1-6
Author(s):  
Fatma A. Shtewi ◽  
Wedad M. Al-Adiwish ◽  
Hamid A. Alqamoudy ◽  
Awatif A. Tarroush
Keyword(s):  
Copper Oxide ◽  
Green Synthesis ◽  
Leaf Extract ◽  
Copper Oxide Nanoparticles ◽  
Cuo Nanoparticles ◽  
Mentha Piperita ◽  
Synthesis Process ◽  
Oxide Nanoparticles ◽  
Cuo Nps ◽  
Tauc Plot

Copper oxide nanoparticles are essential technology materials that are utilized as catalysts in the chemical industry, as well as in photonic and electronic devices and medical applications. Due to their applications in advanced technologies, we have concentrated on the production of CuO nanoparticles using enhanced, cost-effective, and environmentally friendly synthetic techniques. In this paper, we have presented a green synthesis technique to successfully synthesis copper oxide nanoparticles (CuO NPs) utilizing copper (II) sulfate pentahydrate (CuSO4.5H2O) as precursor salt and Mentha Piperita leaf extract as a reducing and stabilizing agent during the synthesis process. The precursor salt solution and reducing agent were mixed in a 1:1 volume ratio at 50 °C. The CuO NPs synthesized were confirmed by the characteristics Surface Plasmon Resonance (SPR) peak in the UV-visible region. Also, the optical direct band gap energy of the CuO NPs determined from the Tauc plot was 3.26 eV. The FTIR spectrum analysis confirmed existence of functional groups of polyphenols from Mentha piperita L. leaf extract, which are responsible for the reduction of Cu2+ ions and effective stabilization of CuO NPs. All the peaks observed in the XRD pattern revealed the production of CuO NPs having monoclinic structure with an average crystallite size of 42.51 nm. The surface morphology of the CuO nanoparticles was detected using SEM analysis. Further, the synthesis mechanism of CuO NPs has also been investigated.

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