Sintering temperature effect on photocatalytic efficiencies of ZnO/TiO2 composite plates

Konyar, Mehmet; Yatmaz, H. Cengiz; Öztürk, Koray

doi:10.1016/j.apsusc.2012.04.058

Cited by 38 publications

(15 citation statements)

References 50 publications

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“…Vlazan et al (2015) also obtained a TiO 2 -ZnO oxide system via a hydrothermal method; the TEM images of the obtained powders showed individual particles of nanometric size (> 50 nm). The observed sintering effect produced by the calcination process is well described in the literature (Chen et al 2015;Konyar et al 2012;Luo and Zhang (2015); Nie et al 2015). In the cited studies it was shown that the calcination process causes the disappearance of individual particles, and closure of the porous structure is observed.…”

Section: Characteristics Of the Synthesized Photocatalystssupporting

confidence: 64%

“…The current state of scientific knowledge indicates that oxide materials of the TiO 2 -ZnO type feature the coexistence of such crystalline structures as rutile and ZnTiO 3 , as well as anatase, Zn 2 TiO 4 and Zn 2 Ti 3 O 8 (Konyar et al 2012;Yamaguchi et al 1987). The presence of specific crystalline structures is also determined by the starting materials (Liu et al 2009).…”

Section: Characteristics Of the Synthesized Photocatalystsmentioning

confidence: 99%

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Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

et al. 2019

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A TiO 2 -ZnO binary oxide system (with molar ratio TiO 2 :ZnO = 8:2) was synthesized by a hydrothermal method, assisted by calcination at temperatures of 500, 600 and 700 °C, using zinc citrate as the precursor of ZnO. The morphology (SEM, TEM), crystalline structure (XRD, Raman spectroscopy), diffuse reflectance spectra (DRS), chemical surface composition (EDXRF), porous structure parameters (low-temperature N 2 sorption) and characteristic functional groups (FT-IR) of the TiO 2 -ZnO oxide materials were comprehensively analyzed. The novelty of this work is the observation of the coexistence of the crystalline structures of anatase and ZnTiO 3 in TiO 2 -ZnO oxide materials. Moreover, it is shown that the obtained materials absorb visible radiation. The key stage of the study was the evaluation of the photocatalytic activity of the TiO 2 -ZnO binary oxide systems in the degradation of model organic pollutants: C.I. Basic Red 1, C.I. Basic Violet 10, C.I. Basic Blue 3 and 4-nitrophenol. For all synthesized materials, a high efficiency of degradation of the model organic impurities was demonstrated. The results show that the synthesized products may be materials of interest for use in the degradation of organic pollutants. Moreover, the kinetics of the photocatalytic degradation of selected organic compounds were determined based on the Langmuir-Hinshelwood equation, assuming a pseudo-first-order (PFO) reaction.

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Section: Characteristics Of the Synthesized Photocatalystssupporting

confidence: 64%

Section: Characteristics Of the Synthesized Photocatalystsmentioning

confidence: 99%

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

et al. 2019

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“…The photocatalytic degradation efficiency is affected by many parameters such as type and structure of semiconductors, mainly TiO 2 and ZnO, pollutant concentration, illumination time and its intensity, pH, and temperature. The simple reactor configuration and the powder form of semiconductor catalysts have several advantages such as low cost, high surface area for adsorption and reaction, high degradation rate, and no mass transfer limitation .…”

Section: Introductionmentioning

confidence: 99%

Degradation Efficiency of Textile and Wood Processing Industry Wastewater by Photocatalytic Process Using In Situ Ultrafiltration Membrane

Doruk

Yatmaz

Dizge

2015

CLEAN Soil Air Water

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The hybrid membrane photocatalytic reactor (MPR) in this study was constructed by submerging a flat polyethersulfone membrane module into a ZnO or TiO 2 slurry photocatalytic reactor for raw wastewater treatment. The short and long term MPR performance was investigated for the degradation of textile and wood processing industry wastewater. The different operational parameters such as the catalyst type, catalyst loading, initial wastewater concentration, light type, and semiconductor powder type affecting the performance of the reactor were initially evaluated using a batch system without a membrane module. After the optimization of the operating conditions, the long term studies were performed by the MPR. Nearly 100% color and 30-55% chemical oxygen demand (COD) removal could be reached at a hydraulic retention time of 6 h for both wastewater effluents. Moreover, reverse osmosis experiments were applied on MPR ultrafiltration effluent for further COD removal and up to 88% COD removal efficiency could be obtained. The color and organic matter degradation efficiency showed that the catalyst can be reused effectively in MPR. In this hybrid design, the membrane module served also as a separator which is very advantageous in keeping catalyst powder in suspension during the operation. The results indicated that the effluent water can be used as process water in the industry.

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“…Titania (TiO 2 ) and ZnO are the two semiconductors attracting the most attention for applications in photocatalysis [1,2], gas sensors [3][4][5] and solar cells [6,7]. Titania composited with other semiconductors has been proved to be effective in improving the photon-induced properties [8,9]; it is therefore not surprising that TiO 2 /ZnO composites have been the topics of many studies [4,7,[10][11][12][13][14][15][16]. On the other hand, one-dimensional nanostructures such as nanotubes and nanorods/nanowires favor a rapid charge transfer to either the surrounding environment or the conductive substrate, which, together with the intrinsic high specific surface area, guarantees an advantageous photon-induced property over compact nanoparticulate films [17].…”

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confidence: 99%

Conformal growth of ZnO on TiO2 nanowire array for enhanced photocatalytic activity

Tao¹,

Wu²,

Xiao³

et al. 2013

Applied Surface Science

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Highlights TiO 2 nanowire array is achieved by direct oxidation of Ti in H 2 O 2 solution at a low temperature of 80 C. A subsequent pulsed laser deposition of ZnO on the TiO 2 nanowire array achieves core-shell TiO 2 /ZnO nanoarrays. The PLD ZnO layer is oriented grown to exhibit an abnormal strong X-ray peak corresponding to (002). The composite film exhibits improved photocurrent and photocatalytic activity.

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Sintering temperature effect on photocatalytic efficiencies of ZnO/TiO2 composite plates

Cited by 38 publications

References 50 publications

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

Degradation Efficiency of Textile and Wood Processing Industry Wastewater by Photocatalytic Process Using In Situ Ultrafiltration Membrane

Conformal growth of ZnO on TiO2 nanowire array for enhanced photocatalytic activity

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