One-step synthesis of ZnO and Ag/ZnO heterostructures and their photocatalytic activity

Mendoza‐Mendoza, Esmeralda; Nuñez-Briones, A.G.; Garcı́a-Cerda, L.A.; Peralta, René D.; Montes-Luna, A.J.

doi:10.1016/j.ceramint.2018.01.001

Cited by 90 publications

(24 citation statements)

References 26 publications

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“…Zinc oxide nanomaterials have been synthesized by different techniques such as the co-precipitation method [4,5], sol–gel method [6,7,8], combustion method [9], hydrothermal method [10], and thermal decomposition [1], depending on the desired structure. ZnO, when modified, could be utilized as a base material for diluted magnetic semiconductors [11], gas sensors [12,13], and photocatalysts [14,15,16,17]. In photocatalytic applications, ZnO nanoparticles were used to remove numerous azo dyes, such as methylene blue [18], methyl orange [17], rhodamine B [19], and methyl red [20].…”

Section: Introductionmentioning

confidence: 99%

Preparation, Characterization and Photocatalytic Activity of La-Doped Zinc Oxide Nanoparticles

et al. 2019

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Lanthanum (La)-doped zinc oxide nanoparticles were synthesized with different La concentrations by employing a gel combustion method using poly(vinyl alcohol) (PVA). The as-synthesized photocatalysts were characterized using various techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), photoluminescence (PL) spectroscopy, and UV–visible absorption spectroscopy. The average size of ZnO nanoparticles decreased from 34.3 to 10.3 nm with increasing concentrations of La, and the band gap, as evaluated by linear fitting, decreased from 3.10 to 2.78 eV. Additionally, it was found that the photocatalytic activity of doped samples, as investigated by using methyl orange dye under visible lights, improved in response to the increase in La concentration. The decomposition of methyl orange reached 85.86% after 150 min in visible light using La0.1Zn0.9O as the photocatalyst.

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Section: Introductionmentioning

confidence: 99%

Preparation, Characterization and Photocatalytic Activity of La-Doped Zinc Oxide Nanoparticles

et al. 2019

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“…As a result of the colorful products increasing the trade of people, the applications of colorful products in different areas are rapidly increasing. In particular, organic dyes released from cosmetics, food, textiles, pharmaceuticals industries form a large proportion of the contaminants in the wastewater 1 . The release of organic dyes, which has high stability, to the environment causes ecological problems and threatens the living life in the water 2 .…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation kinetics of Orange G dye over ZnO and Ag/ZnO thin film catalysts

Tekin

Kızıltaş

2019

Sci Rep

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The degradation of water pollutants with photocatalysts is one of the most studied subjects in the past 20 years. Although considerable studies have been completed in this field, kinetic model studies are still a major inadequacy. In this study, ZnO and Ag/ZnO thin film photocatalysts were synthesized and SEM-EDS, XRD and chronoamperometric measurements were used the characterization of photocatalysts. The network kinetic model was applied the photocatalytic degradation of Orange G using ZnO and Ag/ZnO thin film photocatalysts. The photocatalytic degradation of Orange G was investigated under the different reaction medium (initial dye concentrations, temperature, light intensity). It was found that the network kinetic model is the most appropriate model for the degradation of Orange G dye on the ZnO and Ag/ZnO thin film photocatalysts. The calculated adsorption equilibrium (KB) constant and activation energy of ZnO thin film photocatalyst are 0.0191 and 21.76 kj/mol, respectively. Additionally, the calculated values for Ag/ZnO thin film photocatalyst are 0.035 and 18.32 kj/mol. The general rate equations were determined for each photocatalysts.

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“…This, among others, reduces charge-carriers' recombination, promotes effective charge separation and makes more facile the migration of charge carriers to their reaction sites. Similar effects have been attained by loading noble metals such as Au, Ag, Pd and Pt as co-catalysts [12][13][14] and by the formation of ZnO heterojunctions with other semiconductors like TiO 2 , BiVO 4 , Ag 2 O or Cu 2 O [14][15][16][17][18]. Numerous attempts to extend the light absorption window of ZnO -naturally centered in the ultraviolettowards lower energies have been also reported [19].…”

Section: Introductionmentioning

confidence: 70%

Enhancement Photocatalytic Activity of the Heterojunction of Two-Dimensional Hybrid Semiconductors ZnO/V2O5

et al. 2018

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In this work, we report the fabrication of the new heterojunction of two 2D hybrid layered semiconductors—ZnO (stearic acid)/V2O5 (hexadecylamine)—and its behavior in the degradation of aqueous methylene blue under visible light irradiation. The optimal photocatalyst efficiency, reached at a ZnO (stearic acid)/V2O5 (hexadecylamine) ratio of 1:0.25, results in being six times higher than that of pristine zinc oxide. Reusability test shows that after three photocatalysis cycles, no significant changes in either the dye degradation efficiency loss, nor the photocatalyst structure, occur. Visible light photocatalytic performance observed indicates there is synergetic effect between both 2D nanocomposites used in the heterojunction. The visible light absorption enhancement promoted by the narrower bandgap V2O5 based components; an increased photo generated charge separation favored by extensive interface area; and abundance of hydrophobic sites for dye adsorption appear as probable causes of the improved photocatalytic efficiency in this hybrid semiconductors heterojunction. Estimated band-edge positions for both conduction and valence band of semiconductors, together with experiments using specific radical scavengers, allow a plausible photodegradation mechanism.

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One-step synthesis of ZnO and Ag/ZnO heterostructures and their photocatalytic activity

Cited by 90 publications

References 26 publications

Preparation, Characterization and Photocatalytic Activity of La-Doped Zinc Oxide Nanoparticles

Preparation, Characterization and Photocatalytic Activity of La-Doped Zinc Oxide Nanoparticles

Photocatalytic degradation kinetics of Orange G dye over ZnO and Ag/ZnO thin film catalysts

Enhancement Photocatalytic Activity of the Heterojunction of Two-Dimensional Hybrid Semiconductors ZnO/V2O5

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