Effects of mechanical activation on structure and photocatalytic properties of ZnO powders

Gancheva, Maria; Iordanova, R.; Dimitriev, Y.; Avdeev, G.; Iliev, Tz.

doi:10.2478/s11532-013-0314-4

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…The calculated crystallite size for samples S1 (∼80 nm), S2 (∼37 nm), and S3 (∼70 nm), are in concordance with previously reported values, which is generally reported between 10 nm and 100 nm, depending on the temperature and the synthesis conditions of the system. 51 Ghosh et al 52 found the existance of a trend of the crystallites to decrease in size when the strain increases. This may be due to the retarded crystal growth by the stretched lattice that increases the lattice energy and diminishes the driving force of the growth.…”

Section: Resultsmentioning

confidence: 99%

Role of Ammonia on the Growth Mechanism of ZnO Films Deposited at Ambient Temperature

Rosado-Mendoza¹,

Casanova²,

Oliva³

2020

ECS J. Solid State Sci. Technol.

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Zinc oxide (ZnO) was synthesized by chemical bath deposition (CBD) technique at room temperature. The species distribution diagrams, and the solubility curves were used for determining the better chemical conditions required to evaluate the ammonia role for obtaining high quality ZnO films. ZnSO4, NH4NO3, and KOH were the chemical reagents used for the bath. Three different pH zones between 9 and 13 were selected to synthesize the films. X-ray diffraction analysis showed that the pH value of the chemical bath and the ammonia concentration influences on the structure crystalline of the deposited films. Three different surface morphologies were obtained according to the pH of the solution. The bandgap energy values measured in the deposited films range from 3.52 eV to 3.77 eV. The estimated Urbach’s tails energy values confirmed that samples exhibited high crystallinity. By controlling the ammonia concentration and pH, deposition of high quality ZnO films can be obtained at room temperature.

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Section: Resultsmentioning

confidence: 99%

Role of Ammonia on the Growth Mechanism of ZnO Films Deposited at Ambient Temperature

Rosado-Mendoza¹,

Casanova²,

Oliva³

2020

ECS J. Solid State Sci. Technol.

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“…For example, TiO 2 nanotubes functionalized with CuS quantum dots [76], nanosized hybrids of TiO 2 /SiO 2 [77], Sndoped TiO 2 nanostructured thin flms [78,79], bidoped TiO 2 -ZrO 2 ferromagnetic nanocomposites [80], and Ni x : TiO 2 thin flms [81]. ZnO or ZnSis another category of photocatalyst that has been applied in the photodegradation process of MG. As the same to TiO 2 , it has been used alone in the form of quantum dots [82], thin flms [83], nanoparticles [84] and powders [85], or prepared into composites such as Pt-doped ZnO [86], Mn-doped ZnS [84], Fe 3+ -doped ZnS [82], and a hybrid of ZnO nanorods grown on 3D reduced graphene oxide/Ni foam [87]. Novel photocatalysts are constantly being synthesized and successfully applied for the photodegradation of MG, which illustrates the great interest of researchers in such a category of AOPs.…”

Section: Degradation Of Mg In the Aquaculturementioning

confidence: 99%

Strategies for Solving the Issue of Malachite Green Residues in Aquatic Products: A Review

Luo

Yang

2023

Aquaculture Research

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Malachite green (MG) residue in aquatic products is a widely concerning issue, and the possible source of MG contamination includes its illegal usage and environmental pollution. A variety of strategies for solving such a problem have been proposed, and the research about them is summarized in this review. The MG contamination in aquaculture environments can be eliminated by adsorption, degraded by advanced oxidation processes (AOPs), or biodegraded by microbes or enzymes. The illegal usage of MG can be prevented by screening novel anti-Saprolegnia sp. agents from current available agricultural antibiotics, plant extracts, or antagonistic microbes. Nevertheless, deficiencies also existed in these proposed solving strategies. Therefore, further research opportunities in such areas were provided. This includes developing effective combinatorial methods (adsorption + AOPs or biodegradation) for eliminating MG from the aquaculture environment; systematically considering the impact of practical conditions on the efficiency of MG elimination; screening more efficient anti-Saprolegnia sp. agents; and systematically evaluating both the in vivo activities and safety of these agents.

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“…Salah et al (2011) (Salah et al, 2011) firstly applied HEBM through a planetary mill up to 50h for reducing the particle size of ZnO to nanometric scale from a microcrystalline powder, suggesting the modifications induced in ZnO nanoparticles might prove useful as antibacterial material. Gancheva et al (2013) (Gancheva, Iordanova, Dimitriev, Avdeev, & Iliev, 2013) used the same milling to evaluate the photocatalytic activity of ZnO after milling for 10h with different milling speed rotation (Gancheva et al, 2013). Chen et al (2014) (D. Chen et al, 2014) stated that the defects promoted during HEBM highly influence the photocatalytic activity of ZnO with increased time and rotation due to the bulk defects promoted during the milling process.…”

Section: Introductionmentioning

confidence: 99%

Influence of the shaker mill in the properties of ZnO processed by high energy milling

Storion

Pallone

Giraldi

et al. 2021

RSD

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This work evaluates how the High Energy Ball Milling (HEBM) in a shaker mill influences the optical, physical, and microstructural properties of ZnO. The procedure also combines Fe inclusion from the grinding medium with particle size reduction. ZnO powder was milled by 1, 2, 3, 4, and 5 h, which resulted in a particle size reduction to the nanometric scale with a mean size of around 50 nm and a crystallite size reduction by three times when processed from 4 h. Milling has proven to be an efficient process for obtaining nanoparticles with an incredibly short processing time and changed the morphology of the particles from random to spherical shapes. Results also indicate the processing progressively expanded the ZnO hexagonal structure due to the imposed strain and Fe inclusion, which can help to decrease the bandgap and slow down the recombination rate of the electron-hole pairs, improving the photocatalysis activity. The optical results showed no additional band appeared due to milling processes and diminished the bandgap from 3.37 to 3.21 eV. Milling also led to an increase in the c value from 5.2076 to 5.2112 Å, which is one of the most important factors for improved antibacterial activity. HEBM has proved to be a suitable process for obtaining ZnO nanoparticles with properties useful for various applications.

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Effects of mechanical activation on structure and photocatalytic properties of ZnO powders

Cited by 6 publications

References 20 publications

Role of Ammonia on the Growth Mechanism of ZnO Films Deposited at Ambient Temperature

Role of Ammonia on the Growth Mechanism of ZnO Films Deposited at Ambient Temperature

Strategies for Solving the Issue of Malachite Green Residues in Aquatic Products: A Review

Influence of the shaker mill in the properties of ZnO processed by high energy milling

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