Green synthesis of NiO nanoparticles and application in production of renewable H2 from bioethanol

Bach, Vanessa Rossato; Zempulski, Denise Aparecida; Oliveira, Lígia Gomes; Polinarski, Marcos Antonio; Tonin, Angelica Priscila Parussolo; Meurer, Eduardo C.; Cardozo‐Filho, Lúcio; Alves, Helton José

doi:10.1016/j.ijhydene.2022.05.264

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…Owing to their high surface area to volume ratio, nanoparticles have distinctive and superior physical and chemical properties as compared to their bulk counterparts. [1] Hence, nanoparticles have found practical applications in diverse fields including biology, medicine, [2][3][4][5][6][7][8][9][10][11][12][13][14] biotechnology, chemistry, physics, agriculture, electronics, material sciences, [15][16][17][18][19] and hydrogen storage. [20] They play a notable role as nano-catalysts, [21][22][23][24][25][26][27][28][29][30][31] nano-adsorbents, and environmentremediating agents.…”

Section: Introductionmentioning

confidence: 99%

Eco‐Friendly Synthesis of Iron Nanoparticles Using Green Tea Extract: Characterization and Evaluation of Their Catalytic, Anti‐oxidant and Anti‐bacterial Potentials

2023

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The green route for the synthesis of metal nanoparticles has emerged as a promising pathway due to its simple, non‐toxic, low‐cost, and environment‐friendly nature. In this study, eco‐friendly iron nanoparticles were successfully synthesized from the extract of green tea leaves. The synthesized nanoparticles were characterized by UV‐Visible, FT‐IR, SEM, EDX, TEM, and XRD techniques. The morphological analysis of the nanoparticles by SEM and TEM studies revealed that they were spherical in shape with particle size in the 30–70 nm range. The XRD investigation established the amorphous nature of the nanoparticles. The role of the phytochemicals of the tea extract as the reducing and stabilizing agents for the nanoparticles was confirmed by the FT‐IR analysis. The iron nanoparticles exhibited significant catalytic potential in the degradation of organic dyes‐ malachite green and methylene blue. The reactions followed pseudo‐first‐order kinetics and the percent degradation of 85.20 % for malachite green and 89.42 % for methylene blue was achieved in 20 min. and 10 min. respectively. The nano‐catalyst was reusable for three consecutive cycles of degradation reaction without any significant loss in its activity. The anti‐oxidant activity of the nanoparticles was studied by the DPPH assay wherein the nanoparticles exhibited a promising free radical scavenging ability of about 77 % with the IC50 value of 589.70 μg/mL. The anti‐bacterial activity of the nanoparticles was analyzed by the agar well diffusion method against four bacterial strains: gram‐positive Staphylococcus aureus, Bacillus subtilis, and gram‐negative Escherichia coli, Pseudomonas aeruginosa. The zones of inhibition and the Minimum Inhibitory Concentration (MIC) values of the nanoparticles were determined. The nanoparticles showed moderate toxicity against all the tested bacterial strains. The synthesis of the iron nanoparticles was rapid and simple and the results of the investigated applications were significant and promising.

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Section: Introductionmentioning

confidence: 99%

Eco‐Friendly Synthesis of Iron Nanoparticles Using Green Tea Extract: Characterization and Evaluation of Their Catalytic, Anti‐oxidant and Anti‐bacterial Potentials

2023

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“…In order to preserve the integrity of the nickel oxide nanoparticles, a solution of nickel nitrate (99.99% Sigma-Aldrich) with a concentration of 0.5 M was prepared in a beaker containing 50 mL of distilled water. Previous papers from this research project [3] outlined the comprehensive synthesis process.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of NiO nanoparticles for gas sensor application

Nicolas¹,

Perciani²

2023

ETN

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A green combustion technique assisted by freshly extracted tea (Camellia sinensis /natural tannic acid) was adopted to synthesize NiO nanoparticles. Further research into the physicochemical properties of the NiO nanoparticles was conducted after heating them to 350℃. The average particle size of NiO nanoparticles in their as-prepared state was found to be 18.4 nm, while the average particle size of NiO nanoparticles in their heat-treated condition was found to be 28.7 nm. The scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to record NiO nanoparticles' external morphology, particle shape, and particle size. It was discovered that the NiO nanoparticles had a spherical shape with an average particle size of 23.5 nm for the samples created as is and 34.8 nm for the heated samples. The performance assessment of the petrol sensor was carried out using a number of testing techniques and a variety of gases. NiO nanoparticles outperformed all other testing gases when it came to how effectively the sensor responded to ethanol gas. NiO nanoparticles are interesting materials for use in gas sensor applications, as evidenced by their response-recovery time.

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“…The rising awareness about global environmental problems augmented by rampant usage of petroleum-based polymers has motivated researchers worldwide to create alternative green materials [1][2][3] . Chitin nanostructures [4,5] , due to their nanosized dimensions and distinct properties, are increasingly emerging as a viable choice for the fabrication of functional bio-nanocomposite materials for use in a diverse range of applications [6] ranging from drug delivery vehicles [7] in COVID-19 treatment, wound dressings [8] to environmentally safe food packaging membranes [9] .…”

Section: Introductionmentioning

confidence: 99%

Complex dielectric-impedance spectroscopic studies of magnetite added chitin biopolymer

Rani

Hooda

Dheer

et al. 2023

ACE

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We have successfully synthesized magnetic chitin (MCH) by incorporating iron oxide nanoparticles into biodegradable and abundantly naturally available chitin by the coprecipitation method. X-ray diffraction (XRD) characterization revealed formation of cubic inverse spinel structure of Fe3O4 nanoparticles. In addition to this, other characterization studies like energy dispersive X-ray analysis (EDX) and vibrating sample magnetometry (VSM) were also performed to have an insight into the compositional and functional nature of the structure. A detailed spectroscopic study of complex impedance and dielectric constant for a wide frequency range of ~1 Hz to 10 MHz at discrete temperatures ~300–400 K has been performed by us for the first time on MCH in order to understand various relaxation processes. From permittivity, we have estimated the height of the potential barrier to be ~95.8 ± 0.3 meV. Impedance measurements yielded an activation energy of ~35.85 meV. Thermogravimetric analysis (TGA) of the sample showed exceptionally high thermal stability of the sample with percentage of residual mass at 800 ℃ being ~73% in MCH, which is quite high in comparison to the pristine chitin. An S shaped curve obtained through VSM measurement confirmed the superparamagnetic nature of the nanocomposite. The study assumes significance in the present scenario of rising awareness about the environment and demand to explore alternative green materials with numerous biomedical/environmental applications ranging from drug delivery vehicles in COVID-19 treatment to food packaging.

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Green synthesis of NiO nanoparticles and application in production of renewable H2 from bioethanol

Cited by 5 publications

References 30 publications

Eco‐Friendly Synthesis of Iron Nanoparticles Using Green Tea Extract: Characterization and Evaluation of Their Catalytic, Anti‐oxidant and Anti‐bacterial Potentials

Eco‐Friendly Synthesis of Iron Nanoparticles Using Green Tea Extract: Characterization and Evaluation of Their Catalytic, Anti‐oxidant and Anti‐bacterial Potentials

Synthesis of NiO nanoparticles for gas sensor application

Complex dielectric-impedance spectroscopic studies of magnetite added chitin biopolymer

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