Preparation, characterization and photocatalytic properties of ZnTiO3 powders

Kong, Jizhou; Li, Aidong; Zhai, Haifa; Li, Hui; Yan, Qingyu; Ma, Jan; Wu, Di

doi:10.1016/j.jhazmat.2009.06.092

Cited by 90 publications

(57 citation statements)

References 35 publications

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“…Electron affinities (χ ) of these three oxides have the same value (4.0 eV) as observed by others researchers [46][47][48]. For titanates (Zn 2 TiO 4 and ZnTiO 3 ) values of E g in the range [1,4,9,16,30,[52][53][54]. However, not enough information is found in the literature about the χ values of both ternary compounds.…”

Section: Resultsmentioning

confidence: 53%

“…For instance, the enhancement of the photocatalytic properties of the ZnO-TiO 2 composites, in comparison with TiO 2 oxide, for degrading organic substance has been reported by several authors [1][2][3][8][9][10][11]. In the preparation of the ZnO-TiO 2 system (anatase or/and rutile TiO 2 ), besides the ZnO and TiO 2 binary oxides, the ternary compounds ZnTiO 3 and Zn 2 TiO 4 are, in many cases, originated [12][13][14][15][16]. These titanates have also important photocatalytic properties, whether mixed with ZnO or TiO 2 , or with both: the reason why, at present, they are being widely studied [1,3,9,10,16].…”

Section: Introductionmentioning

confidence: 99%

“…In the preparation of the ZnO-TiO 2 system (anatase or/and rutile TiO 2 ), besides the ZnO and TiO 2 binary oxides, the ternary compounds ZnTiO 3 and Zn 2 TiO 4 are, in many cases, originated [12][13][14][15][16]. These titanates have also important photocatalytic properties, whether mixed with ZnO or TiO 2 , or with both: the reason why, at present, they are being widely studied [1,3,9,10,16]. In this work ZnO-TiO 2 thin films were prepared by the r.f.…”

Section: Introductionmentioning

confidence: 99%

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Band gap coupling in photocatalytic activity in ZnO–TiO2 thin films

2012

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Zinc oxide and titanium dioxide composite thin films were prepared on Corning 7059 glass substrates by co-sputtering. The reactive gas-surroundings used was ultrahigh purity oxygen. To analyze the structural, optical and photocatalytic properties of the ZnO-TiO 2 samples, X-ray diffraction (XRD), atomic force microscopy (AFM), optical absorption, Raman spectroscopy and methylene blue bleaching were carried out at room temperature. XRD patterns indicate the presence of TiO 2 (anatase and rutile phases), ZnO, ZnTiO 3 , and Zn 2 TiO 4 crystalline structures. AFM images allow the observation of non-homogeneous surface in the ZnO-TiO 2 system, suggesting the separation of different crystalline phases in the composite. Raman studies exhibit different spectra in the films depending on the area analyzed, which can be interpreted as a result of the existence of well separated crystalline regions as seen in AFM images. The photocatalytic activity (PA) of TiO 2 -ZnO-ZnTiO 3 -Zn 2 TiO 4 composite, as expected for adequate coupling semiconductors, is larger than PA of ZnO and TiO 2 oxides, used as references. A simple proposal about the probable alignment of the conduction band, the valence band, and the Fermi level is included. E. García-Ramírez · M. Mondragón-Chaparro ESIME Azcapotzalco, Instituto Politécnico Nacional,

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Section: Resultsmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Band gap coupling in photocatalytic activity in ZnO–TiO2 thin films

2012

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“…The removal efficiency of BP at the initial dosage of 0.01 g, increased from 77% at the second minute of contact to 95% at time equals to 30 min by keeping constant stirring, however, with rising LCFO dosage to 0.03 g the percentage of removal obtained in the second minute of stirring was 88%, and the most percent of removal (98%) was attained when the stirring was continued till time equals to 15 min. The adsorbent dosage obtained in this study for complete removal of BP on to LCFO nanopowder is less than most of the reported values in the literatures for dye adsorption using other adsorbents (Moussavi and Mahmoudi, 2009;Song et al, 2008;Kong et al, 2009;Zhang et al, 2006). …”

Section: Effect Of Contact Time and Adsorbent Dosagecontrasting

confidence: 60%

Synthesis and Evaluation Catalytic Efficiency of Perovskite-Type Oxide Nanopowders in Removal of Bromocresol Purple from Aqueous Solution

Tavakkoli¹,

Ghaemi²,

Mostofizadeh³

2014

IJSRK

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Abstract. A 1-x A x BO 3 belongs to the perovskite oxides of the ABO 3 structure. In this study, nanoparticles of La 0.5 Ca 0.5 FeO 3 were fabricated by sol-gel citrate technique. A series of common analytical techniques were used to characterize the crystallinity, morphology, specific surface area, and grain size of the nanopowders. These properties were characterised by means of XRD, SEM, EDX and FTIR. The calculated particles size using the Scherrer's formula was about 20 nm. Moreover, the family of perovskite-type oxides could be considered as an adsorbent/catalyst material for the removal of dyes. This study has also investigated the efficiency of La 0.5 Ca 0.5 FeO 3 , as an adsorbent for removal of dye (Bromocresol Purple (BP)), from an aqueous solution. The adsorption studies were carried out at different pH values, various adsorbent dosages and contact time in a batch experiments. The kinetic studies indicate that the removal process obeys the Pseudo-first-order kinetic equation. Also, the isotherm evaluations reveal that the adsorption of BP by the nanoparticles follows the Langmuir model. In addition, this nanoparticle with good specific affinity towards dye molecules was a promising adsorbent for dye removal from natural water.

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“…Therefore, they are highly beneficial in understanding the physics behind the coupling of these coexisting orders, such as in magneto-electric coupling. It has also been reported that these materials are important for technological applications such as memory devices and solar cells [3][4][5][6][7][8][9][10][11] . Antiferromagnetic MnTiO 3 (T N = 64 K), exhibiting ilmenite structure, possesses a magnetic field induced spin-flop phase (H c = 6.5 T), and it further exhibits a linear magnetoelectric (ME) effect [12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and magnetic symmetry in MnTiO3analyzed by second harmonic generation

et al. 2013

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Second harmonic generation (SHG) and linear absorbance spectra of MnTiO3 were measured and the 1.88, 2.41, 2.63, and 3.06 eV SHG features were identified as d-d optical transitions from 6 A1g to 4 T1g( 4 G), 4 T2g( 4 G), { 4 Eg, 4 A1g( 4 G)}, and 4 Eg( 4 D) respectively. These zero-phonon transitions were used to calculate the octahedral crystal field splitting energy (∆0) and the Racah parameters B and C. The SHG spectra showed significant distinctions between the antiferromagnetic and the paramagnetic or spin-flop phases. The polarization dependence of the SHG in the spin-flop phase provided optical evidence that the spins canted from the c-axis toward the a-axis. These distinctions between the three magnetic phases could be useful for mapping 180 • antiferromagnetic domains in MnTiO3.2

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Preparation, characterization and photocatalytic properties of ZnTiO3 powders

Cited by 90 publications

References 35 publications

Band gap coupling in photocatalytic activity in ZnO–TiO2 thin films

Band gap coupling in photocatalytic activity in ZnO–TiO2 thin films

Synthesis and Evaluation Catalytic Efficiency of Perovskite-Type Oxide Nanopowders in Removal of Bromocresol Purple from Aqueous Solution

Electronic structure and magnetic symmetry in MnTiO3analyzed by second harmonic generation

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