Preparation and characterization of ZrO2/TiO2 composite photocatalytic film by micro-arc oxidation

Luo, Qiang; Cai, Qizhou; Li, Xinwei; Pan, Zhenhua; Li, Yujie; Chen, Xi-di; Yan, Quansheng

doi:10.1016/s1003-6326(13)62818-6

Cited by 34 publications

(14 citation statements)

References 23 publications

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“…These values also support the existence of the anatase phase structure of TiO 2 and correspond to the (101) lattice planes of anatase [30]. The differences in the d-spacing between the TZ-1 sample (0.353 nm) and pure TiO 2 (0.348 nm) are a strong indication of the incorporation of Zr 4+ into the TiO 2 structure [31]. On the other hand, Figure 2b,f show the selected area of electron diffraction of the TZ-1 and TZ-5 samples, where the rings and the similar diffraction patterns are indicative of the TiO 2 anatase phase.…”

Section: Tem-saed Imagessupporting

confidence: 57%

Photocatalytic Degradation of Rhodamine B and Methylene Orange Using TiO2-ZrO2 as Nanocomposite

et al. 2021

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The present research reports the synthesis of ZrO2-doped TiO2 photocatalysts at different ZrO2 contents (1, 3 and 5% wt.) synthesized by the sol–gel method. The samples were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction, attenuated total reflectance-Fourier transform infrared, ultraviolet–visible, X-ray photoelectron spectroscopy and N2 adsorption–desorption analysis. The photocatalytic activity of the ZrO2-doped TiO2 was investigated against the dyes methyl orange and rhodamine B through mineralization studies. The ZrO2-doped TiO2 samples presented a semiglobular-ovoid agglomerate shape around 500–800 nm. The samples presented high crystallinity of the TiO2 anatase phase, XPS suggested the formation of Zr–O–Ti bonds and the samples were classified as mesoporous materials with slight changes in the optical features in comparison with pure TiO2. Our study shows that the ZrO2-doped TiO2 composites exhibited a higher photocatalytic activity than just utilizing the synthetized TiO2 and a commercial P25. The different degradation behaviors are attributed to differences in the textural properties, and to the different optical absorptions of the samples due to structural defects created by the level of doping of Zr4+ ions into the TiO2 lattice. Reaction kinetics parameters were calculated by the Langmuir–Hinshelwood model, and a third run cycle of the ZrO2-doped TiO2 at 1% wt. achieved a photocatalytic degradation of 78.1 and 75.5% for RhB and MO, respectively.

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Section: Tem-saed Imagessupporting

confidence: 57%

Photocatalytic Degradation of Rhodamine B and Methylene Orange Using TiO2-ZrO2 as Nanocomposite

et al. 2021

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“…However, its photocatalytic activity remains insufficient for practical applications because of the high recombination rate of photogenerated electronhole pairs (e --h + ) [2][3]. Thus, TiO2 is coupled with other metal oxides, such as ZrO2, CeO2, NiO, WO3 and Al2O3 in order to improve the photocatalytic activity [4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Interfacial charge-transfer process across ZrO2-TiO2 heterojunction and its impact on photocatalytic activity

Guerrero-Araque

Ramírez-Ortega

Acevedo–Peña

et al. 2017

Journal of Photochemistry and Photobiology A: Chemistry

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2 Graphical abstract Highlights: ZrO2-TiO2 heterojunction with high photocatalytic activity were obtained by solgel. Energy states at heterojunction interface altered the semiconducting properties. 5 mol% ZrO2 in ZrO2-TiO2 heterojunction propitiated a better electron-hole separation. Photocatalytic activity is improved by favoring the charge transfer process. Direct and indirect charge transfer process involved in phototocatalytic process. Abstract.In this paper, ZrO2-TiO2 composites were synthesized by sol-gel method with different ZrO2:TiO2 molar ratios (01:99, 05:95 and 10:90). The results identified two trends; at a low ZrO2 content, the incorporation of Zr 4+ into the TiO2 lattice was possible provoking generation of oxygen vacancies (1 mol % of ZrO2); while at higher ZrO2 contents, ZrO2-TiO2 heterojunctions were created (5 and 10 mol % of ZrO2). The photocatalytic activity was evaluated by measuring photodegradation of phenoxyacetic acid, 2,4-dichlorophenoxyacetic acid or 4-chlorophenol solutions. The ZT-5 composite shows the best performance attributed to surface states at the interface of ZrO2-TiO2 heterojunctions.These surface states act as traps for charge carriers favoring the spatial separation of electron-hole pairs until reaching a maximum in the composite with 5 mol% of ZrO2. The ZT-5 composite showed the most negative flat band potential and the highest donor density indicating that these surface states are in optimal concentration. At higher ZrO2 contents, charge carrier separation is less effective, which decreases the photocatalytic activity.Nevertheless, the molecule structure has an impact on the direct or indirect charge transfer process as was evidenced by EIS measurements.

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“…At present,most studies have doped commercial yttria-stabilized zirconia to change its electrical properties by regulating the crystal phase, morphology and particle size distribution.In addition,many groups have prepared different levels powder by different techniques to further decrease the ohmic resistance of solid electrolyte,for example,chemical coprecipitation method [7] ,sol-gel methods [8] and so on.Rudzani sigwadi [9] prepared zirconia with relatively small particle size and small distance between lattice fringes(0.2928 nm and 0.2824 nm) by precipitation method,and the effect of calcination temperature on the crystallinity and particle size of zirconia particles was investigated.In this paper,lamellar liquid crystal template method is first adopted,which has the important advantage of mild reaction conditions,and enables synthesis of nanopowder at low temperature.…”

Section: 、Introductionmentioning

confidence: 99%

Synthesis of Bismuth Doped Yttria Stabilized Zirconia Electrolyte and Study of Ionic Conductivity

Guo

Zhao

Liu

et al. 2021

Preprint

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x%molBi3+-doped yttria-stabilized zirconia with 4%molYO1.5 (x = 0–5,BiYSZ) are prepared via lamellar liquid crystal template method.The influence of different doping amount of Bi3+ on crystal form,morphology,the ionic conductivity are investigated in detail.In addition,densification time of BiYSZ are determined.X-ray diffraction(XRD),Raman spectrum,Scanning Electron Microscope(SEM) results show that BiYSZ powder with stable tetragonal phase and spherical structure is nanometer level.Moreover,by using the Ac impedance spectroscopy to analyse conductivity of solid electrolytes,we find that Bi3+-doped yttria-stabilized zirconia with 4%molYO1.5 improve the ionic conductivity.Comparing all the compositions,3mol%Bi3+ doped yttria stabilized zirconia with 4%molY3+ gives the highest ionic conductivity of 7.41×10− 5 S/cm− 1 at 500℃,and sintering temperatures of BiYSZ reduce around 100℃ than Y0.04Zr0.96O2(4YSZ),ionic conductivity increases one order of magnitude.

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Preparation and characterization of ZrO2/TiO2 composite photocatalytic film by micro-arc oxidation

Cited by 34 publications

References 23 publications

Photocatalytic Degradation of Rhodamine B and Methylene Orange Using TiO2-ZrO2 as Nanocomposite

Photocatalytic Degradation of Rhodamine B and Methylene Orange Using TiO2-ZrO2 as Nanocomposite

Interfacial charge-transfer process across ZrO2-TiO2 heterojunction and its impact on photocatalytic activity

Synthesis of Bismuth Doped Yttria Stabilized Zirconia Electrolyte and Study of Ionic Conductivity

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