Effect of the Precursor on the Synthesis of ZnO and Its Photocatalytic Activity

Limón-Rocha, Isaías; González, Carlos Alberto Guzmán; Anaya-Esparza, Luis Miguel; Romero-Toledo, Rafael; Rico, José Luis; Vargas, Óscar; Pérez-Larios, Alejandro

doi:10.3390/inorganics10020016

Cited by 23 publications

(13 citation statements)

References 82 publications

(109 reference statements)

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“…This behavior is due to the ionic size of the Ca 2+ ion, which is larger than the guest cation Zn 2+ [29]. The substitution of Ca 2+ with a larger radius in the Zn 2+ sites resulted in an increase in the size of the nanoparticle, which agrees with other investigations where the concentration of the dopant directly influenced the morphology and size of the nanoparticles [30][31][32][33][34].…”

Section: Discussionsupporting

confidence: 88%

“…An XPS analysis was performed for the samples, obtaining signals corresponding to zinc (Zn 2p), calcium (Ca 2p), oxygen (O 1s) and carbon (C 1s). In Figure 5, we observed the characteristic peaks for Zn 2p 1/2 and Zn 2p 3/2 [33]. The signals observed around 1047 and 1024 eV were assigned to Zn in octahedral sites, and the increase in the intensity of these signals with the increase in doping is appreciable, which is related to the increase in the concentration of antisite defects [45,46].…”

Section: Discussionmentioning

confidence: 91%

“…The spectra for carbon (C 1s) is shown in Figure 8, where the peak deconvolutions at 289, 287, 285, and 284 correspond to O-C = C, C = O, C-O and C = C, respectively [48]. The spectra indicates a shift towards higher binding energies when calcium ions are used as a dopant [33,49]. The optical absorbances obtained in the UV-vis analysis (Figure 9) can be attributed to the Zn-O electron transitions of ZnO.…”

Section: Discussionmentioning

confidence: 99%

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A Study of Zn-Ca Nanocomposites and Their Antibacterial Properties

Torres-Ramos

Martín-Camacho

González

et al. 2022

IJMS

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This study aimed to develop Ca2+ doped ZnO nanoparticles (NPs) and investigate their antibacterial properties against microorganisms of dental interest. Zn-Ca NPs were synthesized by the sol-gel method with different concentrations of Ca2+ (1, 3, and 5 wt. %) and subsequently characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-vis spectroscopy and Fourier transform infrared spectroscopy (FT-IR). The Kirby–Bauer method was used to measure antibacterial effects. NPs showed the wurzite phase of ZnO and bandgap energies (Eg) from 2.99 to 3.04 eV. SEM analysis showed an average particle size of 80 to 160 nm. The treatments that presented the best antibacterial activity were Zn-Ca 3% and Zn-Ca 5%. ZnO NPs represent an alternative to generate and improve materials with antibacterial capacity for dental applications.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

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A Study of Zn-Ca Nanocomposites and Their Antibacterial Properties

Torres-Ramos

Martín-Camacho

González

et al. 2022

IJMS

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“…The FTIR spectra for treated powders are shown in Figure 3 . The bands that are typical of Si-O vibrations are visible in the recorded spectra and are identical to those that have been described in the literature [ 16 , 17 , 18 , 19 , 20 , 21 ]. Small bands at 560 cm −1 or 568 cm −1 may be attributed to the vibration of the Si-O-Zn bonds, whereas the main bands at 1273 cm −1 , 1080 cm −1 , 1114 cm −1 , 793 cm −1 , and 467 cm −1 are assigned to Si-O-Si bonds in networks and chains.…”

Section: Resultssupporting

confidence: 82%

The Influence of Gel Preparation and Thermal Treatment on the Optical Properties of SiO2-ZnO Powders Obtained by Sol–Gel Method

Mocioiu

Vladut

Atkinson

et al. 2022

Gels

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The effect of gel preparation and heat treatment on the structural and optical properties of SiO2-ZnO materials prepared by the sol–gel method was investigated. Zinc acetate dehydrate, TEOS (tetraethylortosilicate), ethanol, distillated water and HCl were used as a starting material, solvent and catalyst, respectively. Four powders (G1–G4) were prepared in different ways from the starting materials mentioned above. The method of adding Zn precursors during the synthesis differed from one another. For the G1 synthesis, only Zn acetate powder was employed; for the G2 synthesis, Zn acetate was dissolved in distilled water; and for the G3 synthesis, Zn acetate was dissolved in ethanol. When synthesizing G4, TEOS was added last, after Zn acetate had been combined with water and ethanol. The SiO2-ZnO materials were dried at 200 °C and then heat-treated at 700 °C and 900 °C. All samples were investigated by X-ray diffraction and infrared spectroscopy in order to investigate their structure. SEM measurements were performed to investigate the morphology of materials. Optical properties were influenced by gel preparation and heat treatments. A reflectance of over 60% was obtained for G3 and G4 powders, while for G1 and G2, the reflectance was below 30%. In conclusion, synthesis steps and heat treatment can control the structure and properties of the powders.

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“…Zinc sulfate heptahydrate (M r = 287.6 g/mol) was used as a precursor for a ZnO synthesis too, according to Limón-Rocha et al, 2019 [ 37 ]. A solution of 0.15 M was prepared by mixing zinc sulfate heptahydrate with distilled water.…”

Section: Methodsmentioning

confidence: 99%

ZnO Nanoparticles from Different Precursors and Their Photocatalytic Potential for Biomedical Use

et al. 2022

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Semiconductor photocatalysts, particularly ZnO nanoparticles, were synthesized via the precipitation method using four different precursors (zinc acetate/zinc nitrate/zinc sulfate/zinc chloride) and compared, according to their optical, structural, photocatalytic, and anticancer properties. The materials were characterized via X-ray Diffraction method (XRD), micro-Raman, Fourier Transform Infrared Spectroscopy (FT-IR), Brunauer–Emmett–Teller (BET), Dynamic Light Scattering (DLS), and Field Emission Scanning Electron Microscope (FESEM) analysis. Photocatalysis was conducted under UV and visible light irradiation, using Rhodamine B as the organic pollutant. It was observed that the highest photocatalysis efficiency was obtained by the nanoparticles synthesized from the zinc acetate used as precursor material. A cell-dependent anticancer efficiency of the tested ZnO nanoparticles was also observed, that was also attributed to the different precursors and the synthesis method, revealing that the nanoparticles that were synthesized from zinc acetate were more bioactive among the four tested precursors. Overall, the data revealed that both the enhanced photocatalytic and biological activity of ZnO nanoparticles derived from zinc acetate precursor could be attributed to the reduced crystalline size, increased surface area, as well as the observed hexagonal crystalline morphology.

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Effect of the Precursor on the Synthesis of ZnO and Its Photocatalytic Activity

Cited by 23 publications

References 82 publications

A Study of Zn-Ca Nanocomposites and Their Antibacterial Properties

A Study of Zn-Ca Nanocomposites and Their Antibacterial Properties

The Influence of Gel Preparation and Thermal Treatment on the Optical Properties of SiO2-ZnO Powders Obtained by Sol–Gel Method

ZnO Nanoparticles from Different Precursors and Their Photocatalytic Potential for Biomedical Use

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