Fast and efficient green synthesis of CaWO4 NPs using eggshells as a biogenic calcium source: Structure, optical property, and morphology

Nobre, Francisco Xavier; Mendes, O.C.; Silva, A.P.J. da; Junior, J.L.S.; Nascimento, M.V.B. do; Pessoa, Wanison A.G.; Manzato, Lizandro; Brandim, Ayrton de Sá; Matos, José Milton Elias de; Brito, Walter Ricardo; Couceiro, Paulo Rogério da Costa; Leyet, Y.

doi:10.1016/j.jphotochem.2023.114589

Cited by 5 publications

(6 citation statements)

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“…Variations in the intensity and graphic profile of the crystallographic planes were observed when normalizing and superimposing the diffraction patterns of all samples. These variations were studied using structural refinement by the Rietveld method, which allowed a detailed study of the network parameters ( a , b , c , α, β, γ), atomic coordinates ( x , y , z ), Unit Cell Volume ( V ), Occupation of atoms ( O cc ), and the orientation of crystallographic planes. − …”

Section: Resultsmentioning

confidence: 99%

“…As seen in the images presented in Figure (a–d), it is possible to notice the evident decrease in the maximum absorbance associated with the wavelength at 554 nm, characteristic of the electronic transitions of the chromophore group of the RhB dye after the process of absorbing photons with a wavelength greater than 535 nm. This process includes, among other processes, N-deethylation, cleavage of the chromophore group, opening of the aromatic ring, and mineralization. ,,− …”

Section: Resultsmentioning

confidence: 99%

“…These variations were studied using structural refinement by the Rietveld method, 50 which allowed a detailed study of the network parameters ( a , b , c , α, β, γ), atomic coordinates ( x , y , z ), Unit Cell Volume ( V ), Occupation of atoms ( O cc ), and the orientation of crystallographic planes. 51 − 53 …”

Section: Resultsmentioning

confidence: 99%

“…Among the synthesis methods commonly employed, it is possible to highlight the chemical methods in an aqueous medium based on different precursors of silver ions and phosphorus ions. Thus, the use of chemical route such as hydrothermal, 25 solvothermal, 43 microwave, 32 sol−gel, 30 and sonochemistry 24 methods are classically described in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…The process of generating radials using inorganic semiconductors, mainly metal oxides, consists of absorbing electromagnetic radiation with photons of energetic magnitude equal to or greater than the energy between the valence (VB) and conduction (CB) bands of the semiconductor. 24 The absorption of these photons promotes the excitation of electrons ( e – ) from BV to BC, resulting in the appearance of holes ( h + ) in BV. 25 Therefore, the described process allows the reduction of O 2 dissolved in the aqueous medium to superoxide radicals (O 2 •– ), at the same time, the holes promote the oxidation of water molecules to protons (H + ), hydroxyl ions (HO – ), and hydroxyl radials (HO • ).…”

Section: Introductionmentioning

confidence: 99%

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Solvent Effect on the Structural, Optical, Morphology, and Antimicrobial Activity of Silver Phosphate Microcrystals by Conventional Hydrothermal Method

Takeno,

Nobre,

da Costa

et al. 2024

ACS Omega

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The design of particle size and morphology are a promising approach to investigating the properties exhibited by different types of materials. In the present study, the silver phosphate microcrystals (Ag3PO4) were first time synthesized using the hydrothermal and solvothermal method by combination of the solvents water/isopropyl alcohol (SP-IA), water/acetone (SP-AC), water/ammonium hydroxide (AP-AH), all in a ratio of 1:1 (v/v). The synthesized materials were structurally characterized by X-ray diffraction (XRD), Rietveld refinement, and Raman vibrational spectroscopy, where it was confirmed that the pure phase was achieved for all prepared samples. The study of the optical properties by UV–vis diffuse reflectance spectroscopy (UV–vis/DRS) and colorimetry revealed that the obtained materials have an optical bandgap between 2.30 and 2.32 eV. The FE-SEM images collected revealed different morphologies for the synthesized materials, with a predominance of tetraploid-shaped microcrystals for the SP-AC sample, rods for the SP-IA sample, cubes and polyhedral for the SP-WT sample and condensed polyhedral for the SP-AH sample. The photocatalytic performance against the Rhodamine B dye (RhB) was 100%, 98.2%, 94.2%, and 87.8%, using the samples SP-AC, SP-IA, SP-WT, and SP-AH as photocatalyst at time of 12 min. On the other hand, the antimicrobial performance of SP-AC sample showed superior performance, resulting in the minimum inhibitory concentrationMIC of 7.81 μg mL–1 for the strain of E. coli, 7.81 μg mL–1 for the strain of E. aureus, 15.62 μg mL–1 for the strain of P. auruginosa, and 15.62 μg mL–1 for the strains of C. albicans. In this way, was synthesized a promissory antimicrobial and photocatalyst material, through an easy and cost-effective method.

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