Synthesis of CaO–Ag-NPs @CaCO3 Nanocomposite via Impregnation of Aqueous Sol Ag-NPs onto Calcined Calcium Oxalate

Kodeh, Fawzi S.; El‐Nahhal, Issa M.; Elkhair, Emad Abou; Darwish, A.

doi:10.1007/s42250-019-00112-8

Cited by 12 publications

(4 citation statements)

References 37 publications

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“…The particle size observed using TEM corresponds well with the average crystallite size estimated by Xray diffraction (XRD). This finding aligns with the results reported by (22).…”

Section: High-resolution Transmission Electron Microscopy (Hrtem)supporting

confidence: 94%

Synthesis and Characterization of Calcium Oxide Nanoparticles (CaO NPS) from Snail Shells Using Hydrothermal Method

Chukwuemeke Ulakpa,

Adaeze,

Chimezie

et al. 2024

Journal of the Turkish Chemical Society Section A: Chemistry

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Calcium oxide (CaO) holds significant importance as a catalyst and effective chemisorbent for hazardous gases. This study presents the synthesis of CaO nanoparticles (NPs) using the hydrothermal technique with snail shells' calcium carbonate (CaCO3) as the starting material. The hydrothermal method offers several advantages over alternative approaches for producing metal oxide NPs, including its simplicity, cost-effectiveness, and ability to operate at low temperatures and pressures. By utilizing waste materials like snail shells as a precursor, the entire process becomes more economical, environmentally friendly, and sustainable. The synthesized NPs were analyzed using various techniques, including Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), the Barrett-Joyner-Halenda (BJH) model for pore structure quantification, Brunauer-Emmett-Teller (BET) for surface area calculation, and thermo gravimetric analysis (TGA/DTA-DSC). XRD analysis confirmed that the size of the synthesized CaO NPs was 43.14 nm, determined using the Debye-Scherrer equation. The transmission electron microscopy (TEM) image provided valuable insight into the morphology of the nano-catalyst. The analysis revealed that the nano-catalyst displayed a spherical shape, with an average particle size measuring 50 nanometers. The FTIR and XRD results unequivocally demonstrated the successful conversion of calcium carbonate (CaCO3) derived from snail shells into calcium oxide (CaO). TGA exhibited a significant weight loss peak at 700 °C, indicating the transformation of CaCO3 into CaO. The DTA-DSC curve exhibited sharp endothermic peaks at 700 °C, suggesting a decomposition reaction and the formation of a new compound. SEM images displayed porous, rough, and fragile surfaces that became agglomerated at higher temperatures. In other words, the FE-SEM images of NPs illustrated that the particles were predominantly spherical in morphology. Hence, waste snail shells hold promise as a valuable source of calcium for various applications in different fields.

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“…The particle size observed using TEM corresponds well with the average crystallite size estimated by Xray diffraction (XRD). This finding aligns with the results reported by (22).…”

Section: High-resolution Transmission Electron Microscopy (Hrtem)supporting

confidence: 94%

Synthesis and Characterization of Calcium Oxide Nanoparticles (CaO NPS) from Snail Shells Using Hydrothermal Method

Chukwuemeke Ulakpa,

Adaeze,

Chimezie

et al. 2024

Journal of the Turkish Chemical Society Section A: Chemistry

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“…00-004-0777, it demonstrated a cubic structure without impurities. 20 , 27 , 44 , 45 In the XRD pattern of CaO, a few low-intensity calcite peaks (CaCO 3 ) illustrate rapid carbonation of CaO by atmospheric CO 2. 46 Upon codoping, the slightly shifted layer spacing to higher values is attributed to the homogeneous distribution of Ce and CNC between interlayers of pure CaO, which is consistent with the peak shift observed in XRD spectra.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Degradation with Sustainable CaO Nanorods Doped with Ce and Cellulose Nanocrystals: In Silico Molecular Docking Studies

et al. 2022

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This research work intends to evaluate the photoactivity of calcium oxide (CaO) nanorods (NRs) doped with cellulose nanocrystals (CNCs) and cerium (Ce). CNC-doped CaO and Ce/CNC codoped CaO were synthesized via the sol–gel technique. Structural, optical, morphological, physiochemical, phase constitution, and functional group evaluations were performed. The photodegradation of the prepared nanostructures was analyzed by observing photodegradation of a mixture of methylene blue and ciprofloxacin dye under light irradiation. The photocatalytic activity of the dye was drastically enhanced upon codoping in CaO. For both Escherichia coli and Staphylococcus aureus , statistically significant inhibitory zones ( p < 0.05) were achieved in the case of CNCs and pristine and codoped CaO. Furthermore, in silico molecular docking studies (MDS) were accomplished against DNA gyrase from nucleic acid biosynthesis and enoyl-[acyl-carrier-protein] reductase (FabI) from the fatty acid biosynthetic pathway to rationalize the possible mechanism behind these antibacterial activities.

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“…25 A recent study reported that a CaO-Ag-NPs@CaCO 3 nanocomposite showed strong antimicrobial activity against Escherichia coli and Staphylococcus aureus. 26 It is also used as an absorbent, water soener, and potential hydrogen regulator for wastewater and in fertilizers. 27 The properties of multi-metal composite oxides fabricated from the assembly of individual oxides make the materials potentially signicant in the elds of electronic devices, catalysis, photocatalysis and nonlinear optical and semiconductor devices.…”

Section: Introductionmentioning

confidence: 99%

Enhanced visible light-mediated photocatalysis, antibacterial functions and fabrication of a 3-chlorophenol sensor based on ternary Ag₂O·SrO·CaO

et al. 2020

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A novel multi-metal oxide nanocomposite, Ag 2 O$SrO$CaO, was synthesized by a facile co-precipitation method followed by calcinations. The synthesized nanocomposite was characterized by XRD, FESEM, EDS, TEM, FTIR spectroscopy and photoluminescence (PL) spectroscopy. The composite showed enhanced photocatalytic activity under visible light irradiation and excellent anti-bacterial performance against both Gram-positive and Gram-negative bacteria. Here, the synthesized Ag 2 O$SrO$CaO nanomaterials were deposited on a glassy carbon electrode (GCE) in the form of a thin film to fabricate the desired electrochemical sensor and subjected to I-V analysis of 3-chlorophenol (3-CP) in a phosphate buffer solution (PBS). A calibration curve was plotted from the linear relation of current versus concentration and used to calculate the sensitivity (8.9684 mA mM À1 cm À2 ), linear dynamic range (LDR, 0.1 nM to 0.01 mM) and lower limit of detection (DL, 97.12 AE 4.86 pM). The analytical parameters of the sensor such as response time, reproducibility and long-term stability in the detection of 3-CP were reliable. Finally, it was used to analyze real samples collected from various environmental sources and found to be acceptable.

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Synthesis of CaO–Ag-NPs @CaCO3 Nanocomposite via Impregnation of Aqueous Sol Ag-NPs onto Calcined Calcium Oxalate

Cited by 12 publications

References 37 publications

Synthesis and Characterization of Calcium Oxide Nanoparticles (CaO NPS) from Snail Shells Using Hydrothermal Method

Synthesis and Characterization of Calcium Oxide Nanoparticles (CaO NPS) from Snail Shells Using Hydrothermal Method

Enhanced Photocatalytic Degradation with Sustainable CaO Nanorods Doped with Ce and Cellulose Nanocrystals: In Silico Molecular Docking Studies

Enhanced visible light-mediated photocatalysis, antibacterial functions and fabrication of a 3-chlorophenol sensor based on ternary Ag₂O·SrO·CaO

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Synthesis of CaO–Ag-NPs @CaCO3 Nanocomposite via Impregnation of Aqueous Sol Ag-NPs onto Calcined Calcium Oxalate

Cited by 12 publications

References 37 publications

Synthesis and Characterization of Calcium Oxide Nanoparticles (CaO NPS) from Snail Shells Using Hydrothermal Method

Synthesis and Characterization of Calcium Oxide Nanoparticles (CaO NPS) from Snail Shells Using Hydrothermal Method

Enhanced Photocatalytic Degradation with Sustainable CaO Nanorods Doped with Ce and Cellulose Nanocrystals: In Silico Molecular Docking Studies

Enhanced visible light-mediated photocatalysis, antibacterial functions and fabrication of a 3-chlorophenol sensor based on ternary Ag2O·SrO·CaO

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Enhanced visible light-mediated photocatalysis, antibacterial functions and fabrication of a 3-chlorophenol sensor based on ternary Ag₂O·SrO·CaO