Influence of Li2+ Doping on the Structural and Optical Properties of CaO Synthesized by Sol–Gel Process

Lalou, Nadir; Kadari, Ahmed

doi:10.1142/s2251237319500023

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…The linear part of this curve is extrapolated to zero on the energy axis to get the value of optical band gap. The value of optical band gap thus obtained to be 3.48 eV which is lower than the value (6.26 eV) for bulk CaO but found compatible with the reported results for CaO nanoparticles by different researches [11,19]. This low value of optical band gap may be associated with the presence of Ca(OH) 2 phase in the CaO nanoparticles which provides defect states between the energy gap and reduces the band gap.…”

Section: Optical Characterization Of Cao Nanoparticlessupporting

confidence: 87%

“…It has been reported that solution based chemical methods has excellent tendency to control the size, shape, distribution and other properties of the end products [4]. CaO and Ca(OH) 2 nanoparticles are reported to synthesized by sol-gel method, thermal decomposition, precipitation, hydrothermal, microwave-assisted method, etc., [3,9,[11][12][13][14][15][16][17][18][19]. Among all these methods, direct precipitation is simple, cost-effective, reproductive and rapid technique for nanoparticles synthesis [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Structural, Optical and Antibacterial Response of CaO Nanoparticles Synthesized via Direct Precipitation Technique

Kumar¹,

Sharma²,

Pradhan³

et al. 2021

Nano BioMed ENG

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Calcium oxide (CaO) is a promising material that works as a glass constituent, catalyst, toxicwaste remediation, poisonous gas absorbent, industrial refectory element for metal smelting, paper bleaching, sulfur neutralization in sugar, cosmetics and drug delivery mediator. This work proposes the synthesis of CaO nanoparticles by direct precipitation technique using an aqueous solution of calcium chloride and sodium hydroxide precursors. The synthesized nanoparticles are characterized for the structure, morphology, chemical composition and optical behavior using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), field effect scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS), and diffuse reflectance spectroscopy. The XRD results show that the CaO nanoparticles have been synthesized in a cubic crystalline structure with the average crystallite size of about 13 nm and display aggregated morphology of nanoclusters. The presence of distinct peaks in the FTIR and EDS spectra reveal that the nanoparticles are successfully formed from the chemical recipe of the precipitation process. The optical bandgap has been estimated from the Kubelka-Munk plot and found to be 3.48 eV. The antibacterial activity of CaO nanoparticles has been tested by the well diffusion technique and observed that it shows good antibacterial action against the gram-negative bacterial strains.

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Section: Optical Characterization Of Cao Nanoparticlessupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Structural, Optical and Antibacterial Response of CaO Nanoparticles Synthesized via Direct Precipitation Technique

Kumar¹,

Sharma²,

Pradhan³

et al. 2021

Nano BioMed ENG

View full text Add to dashboard Cite

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Green synthesis of CaO nanoparticles from chicken eggshells: antibacterial, antifungal, and heavy metal (Pb2⁺, Cr2⁺, Cd2⁺ and Hg2⁺) adsorption properties

Hemmami,

Zeghoud,

Ben Amor

et al. 2024

Front. Environ. Sci.

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BackgroundChicken eggshells, a common poultry byproduct, are rich in calcium and provide a sustainable source for producing calcium oxide nanoparticles (CaO NPs). Their use in eco-friendly synthesis aligns with the growing emphasis on sustainable materials for environmental and biomedical applications. Objectives: This study develops an eco-friendly method for synthesizing CaO NPs from chicken eggshells, characterizes their physicochemical properties, and evaluates their antibacterial and antifungal activities. It also tests their effectiveness in removing heavy metal ions (Pb2⁺, Cr2⁺, Cd2⁺, and Hg2⁺) from aqueous solutions.MethodsCaO NPs were synthesized by calcining chicken eggshells at 700°C for 7 h. Comprehensive characterization included analysis of crystalline structure, morphology, optical properties, bandgap energy, chemical composition, and thermal stability. Antibacterial and antifungal activities were tested using the well-agar diffusion method. Batch adsorption experiments evaluated heavy metal ion removal under varying conditions of pH, temperature, stirring time, and adsorbent concentrationResultsThe synthesis produced spherical, single-crystal CaO NPs with diameters ranging from 5 to 30 nm and a crystalline size of approximately 20 nm. The nanoparticles had a bandgap energy of about 4.7 eV. Significant antibacterial activity was observed against Staphylococcus aureus, Klebsiella pneumoniae, and Escherichia coli, with increasing inhibition zones correlating with nanoparticle concentration. The CaO NPs also effectively inhibited Candida albicans. For efficient metal ion removal, the optimal conditions were found to be 30 min at pH 6 with 40 mg of CaO NPs at 25°C, achieving recovery rates of 98% for Pb2⁺, 97% for Cd2⁺, 97% for Cr2⁺, and 97% for Hg2⁺. For near-complete removal, extending the process to 70 min at pH 6 with 40 mg of CaO NPs at 45°C achieved the highest recovery rates: 99% for Pb2⁺, 98% for Cd2⁺, 99% for Cr2⁺, and 99% for Hg2⁺, though this approach involves higher energy and cost.ConclusionCaO NPs derived from chicken eggshells are effective antibacterial agents and adsorbents for heavy metal removal. These findings highlight their potential for sustainable applications in environmental and biomedical fields.

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Influence of Li2+ Doping on the Structural and Optical Properties of CaO Synthesized by Sol–Gel Process

Cited by 2 publications

References 17 publications

Structural, Optical and Antibacterial Response of CaO Nanoparticles Synthesized via Direct Precipitation Technique

Structural, Optical and Antibacterial Response of CaO Nanoparticles Synthesized via Direct Precipitation Technique

Green synthesis of CaO nanoparticles from chicken eggshells: antibacterial, antifungal, and heavy metal (Pb2⁺, Cr2⁺, Cd2⁺ and Hg2⁺) adsorption properties

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