Preparation of Ni Doped ZnO-TiO<sub>2</sub>Composites and Their Enhanced Photocatalytic Activity

Zou, Xiaowen; Dong, Xiaoli; Wang, Limei; Ma, Hongchao; Zhang, Xinxin; Zhang, Xiufang

doi:10.1155/2014/893158

Cited by 14 publications

(8 citation statements)

References 37 publications

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“…This probably due to small dopant concentration of ZnO used in this study which is only 0.75%. This finding is in agreement with the reported studies where disappearances of ZnO peaks is attributed to the very small of crystallite size [3]. Figure 3(a) illustrates the highest intensity at 600 o C and sharpen peaks indicate at higher calcination temperature up to 600 o C promotes higher crystallinity of catalyst forming.…”

Section: Resultssupporting

confidence: 92%

“…Specifically, absorption of TiO 2 can be extended to visible range [3] when coupling with other semiconductor or doping with non-metal or metal ion such as B, C, N, Fe 3+ and Zn 2+ [4] or metal oxides such as ZnO and MgO. Previous works reported that ZnO appeared as promising photocatalyst and alternative to TiO 2 since its photo degradation mechanism was identical to TiO 2 .…”

Section: -2506mentioning

confidence: 99%

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EFFECT OF CALCINATION TEMPERATURE ON ZnO/TIO2 COMPOSITE IN PHOTOCATALYTIC TREATMENT OF PHENOL UNDER VISIBLE LIGHT

Abdullah

So'aib²,

Krishnan

2017

MJAS

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Composite catalyst ZnO/TiO 2 of molar ratio 0.75% was synthesized via sol gel method. The effect of preparation method on the crystal morphology was investigated. The catalyst particles were calcinated at 500 o C,550 o C and 600 °C for 3 hours. The XRD results revealed that calcination temperature controls the crystalline phase in terms of homogeneity and surface area of catalyst produced. The particle size was found to increase with calcination temperature suggesting the effect of different calcination temperatures on catalytic activity for complete degradation of phenol. The result found that ZnO/TiO 2 catalyst calcinated at 600 o C resulted in 70% phenol degradation within five hours of irradiation time under visible light. The kinetic behavior of phenol degradation was found to fit with pseudo first order Langmuir-Hinshelwood kinetic model. Keywords: sol gel, ZnO/TiO 2 catalyst, photocatalytic degradation, visible light, kinetic Abstrak Pemangkin komposit ZnO/TiO 2 dengan 0.75% nisbah molar telah di sintesis melalui kaedah sol gel. Kesan kaedah penyediaan pada morfologi kristal itu telah di selidiki. Zarah-zarah pemangkin telah dikalsinkan pada suhu 500 o C, 550 o C dan 600 o C selama 3 jam. Keputusan XRD menunjukkan suhu pengkalsinan mengawal fasa kristal dari segi kesamaan dan kawasan permukaan pemangkin dihasilkan. Saiz zarah didapati meningkat sejajar dengan peningkatan suhu pengkalsinan mencadangkan kesan suhu pengkalsinan yang berbeza pada aktiviti pemangkin untuk penyingkiran penuh fenol. Keputusan mendapati pemangkin ZnO/TiO 2 yang dikalsinkan pada 600 o C boleh menyebabkan 70% fenol terdegradasi bagi tempoh lima jam masa penyinaran di bawah cahaya nampak. Kelakuan kinetik degradasi fenol didapati sesuai dengan pseudo peringkat pertama model kinetik Langmuir -Hinshelwood.

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Section: Resultssupporting

confidence: 92%

Section: -2506mentioning

confidence: 99%

EFFECT OF CALCINATION TEMPERATURE ON ZnO/TIO2 COMPOSITE IN PHOTOCATALYTIC TREATMENT OF PHENOL UNDER VISIBLE LIGHT

Abdullah

So'aib²,

Krishnan

2017

MJAS

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“…Thus, B, ZnO, and TiO 2 altogether resulted in a synergistic effect to obtain enhanced photocatalytic performance of B-ZnO/TiO 2 [17,26]. Furthermore, B-ZnO/TiO 2 nanocomposites exhibit superior photocatalytic performance compared to other nanocomposites presented in the literature [17,18,20,[40][41][42][43][44][45], as summarized in Table 2, indicating that B-ZnO/TiO 2 can be a promising photocatalyst for the removal of organic dyes.…”

Section: Photocatalytic Removal Of Mb Dyementioning

confidence: 89%

Natural Sunlight Driven Photocatalytic Removal of Toxic Textile Dyes in Water Using B-Doped ZnO/TiO2 Nanocomposites

et al. 2022

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A novel B-doped ZnO/TiO2 (B–ZnO/TiO2) nanocomposite photocatalyst was prepared using a mechanochemical–calcination method. For the characterization of the synthesized B–ZnO/TiO2 photocatalyst, XRD, FESEM-EDS, FTIR, UV-Vis DRS, BET, PL, and XPS techniques were used. The bandgap energy of B–ZnO/TiO2 was reduced, resulting in enhanced visible-light absorption. Significant PL quenching confirmed the reduction in the electron–hole recombination rate. Furthermore, reduced crystallite size and a larger surface area were obtained. Hence, the B–ZnO/TiO2 photocatalyst exhibited better photocatalytic activity than commercial TiO2, ZnO, B–ZnO, and ZnO/TiO2 in the removal of methylene blue (MB) dye under natural sunlight irradiation. The effects of various parameters, such as initial concentration, photocatalyst amount, solution pH, and irradiation time, were studied. Under optimal conditions (MB concentration of 15 mg/L, pH 11, B–ZnO/TiO2 amount of 30 mg, and 15 min of operation), a maximum MB removal efficiency of ~95% was obtained. A plausible photocatalytic degradation mechanism of MB with B–ZnO/TiO2 was estimated from the scavenger test, and it was observed that the •O2− and •OH radicals were potential active species for the MB degradation. Cyclic experiments indicated the high stability and reusability of B–ZnO/TiO2, which confirmed that it can be an economical and environmentally friendly photocatalyst.

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“…e absence of other Zn 2p peaks indicates that zinc ions form ZnO and that they are not part of the TiO 2 lattice. e XPS O 1s spectra (Figure 2(d)) for all nanocomposites are also identical and are characterized by peaks at 529.2 eV and 531.7 eV, which correspond to oxygen bound in the crystal lattice of metal oxides and hydroxyl oxygen (OH) on the sample surface, respectively [53].…”

Section: Xps Surface States Ofmentioning

confidence: 93%

Characterization of Commercial TiO2 P90 Modified with ZnO by the Impregnation Method

Dontsova

Yanushevska

Nahirniak

et al. 2021

Journal of Chemistry

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This article is devoted to TiO2/ZnO nanocomposites’ creation by modifying with the commercial TiO2/P90 product using the impregnation method and identifying the effect of the ZnO modifier on its adsorption, structural, photocatalytic, and electrical properties. The synthesized TiO2/ZnO nanocomposites were characterized by XRD, XRF, XPS, and low-temperature nitrogen adsorption-desorption methods. As a result, nanostructured TiO2/ZnO composites with the ZnO content of 2, 5, 10, and 15% were obtained. It was shown that the phase composition of TiO2/P90 does not change during the nanocomposite synthesis. XPS studies of TiO2/ZnO nanocomposites indicated the presence of Ti4+, Zn2+, O2−, and OH states on their surface, which is associated with TiO2, ZnO, and hydroxide ions. The nitrogen adsorption-desorption method showed that the commercial TiO2/P90 sample is nonporous, and all TiO2/ZnO nanocomposites are characterized by almost the same homogeneous mesoporous structure. Experimentally established sorption and photocatalytic properties depend on the specific surface area and electrostatic interaction with dyes. The effect of the ZnO modifier on I-V characteristics of the TiO2/P90 sample was revealed. The obtained experimental data showed that the TiO2/P90 sample contains one type of current carriers, and TiO2/2ZnO and TiO2/5ZnO nanocomposites are characterized by two types of current carriers.

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Preparation of Ni Doped ZnO-TiO₂Composites and Their Enhanced Photocatalytic Activity

Cited by 14 publications

References 37 publications

EFFECT OF CALCINATION TEMPERATURE ON ZnO/TIO2 COMPOSITE IN PHOTOCATALYTIC TREATMENT OF PHENOL UNDER VISIBLE LIGHT

EFFECT OF CALCINATION TEMPERATURE ON ZnO/TIO2 COMPOSITE IN PHOTOCATALYTIC TREATMENT OF PHENOL UNDER VISIBLE LIGHT

Natural Sunlight Driven Photocatalytic Removal of Toxic Textile Dyes in Water Using B-Doped ZnO/TiO2 Nanocomposites

Characterization of Commercial TiO2 P90 Modified with ZnO by the Impregnation Method

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Preparation of Ni Doped ZnO-TiO2Composites and Their Enhanced Photocatalytic Activity

Cited by 14 publications

References 37 publications

EFFECT OF CALCINATION TEMPERATURE ON ZnO/TIO2 COMPOSITE IN PHOTOCATALYTIC TREATMENT OF PHENOL UNDER VISIBLE LIGHT

EFFECT OF CALCINATION TEMPERATURE ON ZnO/TIO2 COMPOSITE IN PHOTOCATALYTIC TREATMENT OF PHENOL UNDER VISIBLE LIGHT

Natural Sunlight Driven Photocatalytic Removal of Toxic Textile Dyes in Water Using B-Doped ZnO/TiO2 Nanocomposites

Characterization of Commercial TiO2 P90 Modified with ZnO by the Impregnation Method

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Preparation of Ni Doped ZnO-TiO₂Composites and Their Enhanced Photocatalytic Activity