Biosynthesis of cuprous oxide using banana pulp waste extract as reducing agent

Torres-Arellano, S.; Reyes-Vallejo, O.; Pantoja, Joel; Alemán-Ramirez, J.L.; Huerta-Flores, Ali M.; Moreira, J.; Muñiz, Jesús; Vargas-Estrada, Laura; Sebastián, P.J.

doi:10.1016/j.fuel.2020.119152

Cited by 16 publications

(3 citation statements)

References 43 publications

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“…The crystal structure of the catalyst was characterized using X‐ray diffraction (XRD) (Rigaku diffractometer, Tokyo, Japan) with Cu‐K α radiation (1.5406 Å) in the 2θ range of 10–70°. The crystallite size ( D ) was estimated using the Scherrer formula in Equation (1):

D goodbreak= \frac{kλ}{Bcosθ}

where B is the full‐width at half‐maximum (FWHM) of the peak (in radians), θ is the Bragg angle, k is the shape factor (0.9) and λ is the X‐ray wavelength (1.5405 Å) 24 …”

Section: Methodsmentioning

confidence: 99%

“…where B is the full-width at half-maximum (FWHM) of the peak (in radians), θ is the Bragg angle, k is the shape factor (0.9) and λ is the X-ray wavelength (1.5405 Å). 24 Raman spectroscopy characterization with a confocal Raman system (NTEGRA Spectra NT-MDT, 1000 BV Amsterdam, Netherlands) was performed to determine the phases present in the samples. The excitation source was a laser at 532 nm.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

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Crystal phase evolution of high temperature annealed Fe₃O₄‐CaO catalysts for biodiesel production

Alemán-Ramirez

Reyes-Vallejo

Okoye³

et al. 2023

Biofuels Bioprod Bioref

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Biodiesel (BD) is an alternative transportation fuel that has been commercialized. Most CaObased heterogeneous catalysts that are applied for BD production become strongly deactivated after not more than five cycles of reuse. Predominantly CaO and Ca(OH) 2 active phases in eggshell were mixed with Fe 3 O 4 by ball milling for 3 h followed by annealing at different temperatures (200-1000 °C) for 2 h to produce a magnetic catalyst. The catalyst was deployed to synthesize BD using a transesterification reaction with methanol. The catalyst characterization results from X-ray diffraction and Raman analysis revealed the phase evolution of the catalysts with increasing annealing temperature, which facilitated the oxidation of the Fe 3 O 4 to the maghemite (Fe 2 O 3 ) phase. Increasing temperature led to a decrease in the catalyst surface area due to increased rigidity and loss of pores; however, the basicity increased due to the conversion of calcium carbonates mainly to CaO. Under optimal conditions of 65 °C, methanol/ oil molar ratio of 12:1, and 4 wt% catalyst loading, BD yield of 95.33% could be achieved under 120 min reaction time. The catalyst could be reused seven times with minimal loss in catalytic activity. The synthesized BD showed a calorific value of 39.99 MJkg -1 , a density of 0.9 gcm -3 , a viscosity of 4.92 mm 2 s -1 , which satisfactorily complied with the international standards of ASTM-D-6751 and EN-14214.

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D goodbreak= \frac{kλ}{Bcosθ}

where B is the full‐width at half‐maximum (FWHM) of the peak (in radians), θ is the Bragg angle, k is the shape factor (0.9) and λ is the X‐ray wavelength (1.5405 Å) 24 …”

Section: Methodsmentioning

confidence: 99%

Section: Catalyst Characterizationmentioning

confidence: 99%

Crystal phase evolution of high temperature annealed Fe₃O₄‐CaO catalysts for biodiesel production

Alemán-Ramirez

Reyes-Vallejo

Okoye³

et al. 2023

Biofuels Bioprod Bioref

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“…Plant extracts are often preferred for their simplicity and rapid reduction capabilities, whereas microorganisms offer versatility and the potential for controlled synthesis under specific conditions ( Varghese et al, 2020 ). Numerous studies have reported successful synthesis of Cu 2 O particles using plant extracts, including banana pulp waste ( Torres-Arellano et al, 2021 ), Aloe vera ( Kerour et al, 2018 ), Piper longum ( Murphin Kumar et al, 2020 ), and Cressa leaf ( Hui et al, 2022 ) extracts. These methods not only align with sustainable and eco-friendly principles but also contribute to the expansion of green nanotechnology in the production of Cu 2 O NPs for diverse applications ( Waris et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Plant mediated synthesis of flower-like Cu2O microbeads from Artimisia campestris L. extract for the catalyzed synthesis of 1,4-disubstituted 1,2,3-triazole derivatives

Abdelbaki,

Djemoui,

Souli

et al. 2024

Front. Chem.

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This study presents a novel method for synthesizing 1,4-disubstituted 1,2,3-triazole derivatives through a one-pot, multi-component addition reaction using flower-like Cu2O microbeads as a catalyst. The flower-like Cu2O microbeads were synthesized using an aqueous extract of Artimisia Campestris L. This extract demonstrated the capability to reduce and stabilize Cu2O particles during their initial formation, resulting in the formation of a porous flower-like morphology. These Cu2O microbeads exhibit distinctive features, including a cubic close-packed (ccp) crystal structure with an average crystallite size of 22.8 nm, bandgap energy of 2.7 eV and a particle size of 6 µm. Their catalytic activity in synthesizing 1,4-disubstituted 1,2,3-triazole derivatives was investigated through systematic exploration of key parameters such as catalyst quantity (1, 5, 10, 15, 20, and 30 mg/mL), solvent type (dimethylformamide/H2O, ethanol/H2O, dichloromethane/H2O, chloroform, acetone, and dimethyl sulfoxide), and catalyst reusability (four cycles). The Cu2O microbeads significantly increased the product yield from 20% to 85.3%. The green synthesis and outstanding catalytic attributes make these flower-like Cu2O microbeads promising, efficient, and recyclable catalysts for sustainable and effective chemical transformations.

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Calcium–Magnesium oxide by the ball-milling method using eggshell as calcium source: its study for photodegradation of methylene blue

Reyes-Vallejo

Sánchez-Albores

Ashok

et al. 2023

J Mater Sci: Mater Electron

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In this study, the synthesis of Calcium–Magnesium oxide through the ball milling method using eggshell as a CaO source, developing an ecological process synthesis, is presented. After ball milling, an annealing process was carried out in order to increase the crystallinity of the material to enhance its optoelectronic properties by varying the temperature from 450 to 900 °C. The samples were analyzed by X-ray diffraction, Raman and UV–Vis spectroscopy, FE-SEM, photoluminescence, and BET analysis. The ball milling process itself promoted a reduction in particle size, which increased slightly during the annealing process, achieving a more homogeneous size distribution and improving its crystallinity, according to XRD and Raman spectroscopy. The samples were tested for the photodegradation of methylene blue (100 mL of a 10 ppm solution), using LED lamps (200 W). The best photodegradation performance was recorded with the sample annealed at 750 °C, which is explained by the more homogeneous size distribution and the greater surface area, a smaller band gap, and fewer surface defects, which causes greater absorption of light, a better transport of the charge carriers and consequently a better performance in the photodegradation of MB. The complete removal of MB was achieved in 20 min under sunlight stimulation, which can be reduced to 12 min using 400 mg of the catalyst. On the other hand, the trapping experiment showed that superoxide radicals (·O2−) and holes (h+) are the key reactive species in the photodegradation process of MB. The kinetic study showed to follow a pseudo-first-order for all cases. These photodegradation results reported for the first time are better than those reported in other Calcium–Magnesium oxide synthesized by combustion or ultrasound-assisted methods.

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Biosynthesis of cuprous oxide using banana pulp waste extract as reducing agent

Cited by 16 publications

References 43 publications

Crystal phase evolution of high temperature annealed Fe₃O₄‐CaO catalysts for biodiesel production

Crystal phase evolution of high temperature annealed Fe₃O₄‐CaO catalysts for biodiesel production

Plant mediated synthesis of flower-like Cu2O microbeads from Artimisia campestris L. extract for the catalyzed synthesis of 1,4-disubstituted 1,2,3-triazole derivatives

Calcium–Magnesium oxide by the ball-milling method using eggshell as calcium source: its study for photodegradation of methylene blue

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Biosynthesis of cuprous oxide using banana pulp waste extract as reducing agent

Cited by 16 publications

References 43 publications

Crystal phase evolution of high temperature annealed Fe3O4‐CaO catalysts for biodiesel production

Crystal phase evolution of high temperature annealed Fe3O4‐CaO catalysts for biodiesel production

Plant mediated synthesis of flower-like Cu2O microbeads from Artimisia campestris L. extract for the catalyzed synthesis of 1,4-disubstituted 1,2,3-triazole derivatives

Calcium–Magnesium oxide by the ball-milling method using eggshell as calcium source: its study for photodegradation of methylene blue

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Crystal phase evolution of high temperature annealed Fe₃O₄‐CaO catalysts for biodiesel production

Crystal phase evolution of high temperature annealed Fe₃O₄‐CaO catalysts for biodiesel production