Synthesis of mesoporous worm-like ZrO 2 –TiO 2 monoliths and their photocatalytic applications towards organic dye degradation

Thejaswini, T.V.L.; Prabhakaran, D.; Mohan, Akhila Maheswari

doi:10.1016/j.jphotochem.2017.05.015

Cited by 45 publications

(36 citation statements)

References 35 publications

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“…Titania has also been combined with other semiconductor such as ZnO [15,16], SnO2 [17], CeO2 [18] or ZrO2 [19] in order to increase the specific surface, the photocatalytic activity or decrease the formation of free radicals. Regarding the ZrO2-TiO2 combination, it has been previously reported that zirconia doping increases the specific surface area [20,21], the surface acidity [22], the transition temperature between anatase and rutile [21][22][23], the adsorption and the hydrophilic properties [20,24]. However, in most studies [19,[21][22][23], the doped materials require a calcination step to obtain crystalline materials.…”

Section: Introductionmentioning

confidence: 99%

Ambient temperature ZrO2-doped TiO2 crystalline photocatalysts: Highly efficient powders and films for water depollution

Mahy

Lambert

Tilkin

et al. 2019

Materials Today Energy

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In this paper, several TiO2 materials doped with zirconia precursor (0.7, 1.4, 1.6 and 2.0 mol%) were synthesized by an easy aqueous sol-gel synthesis at ambient temperature. This method consisted in the peptization of the TiO2 colloid in presence of HNO3. The corresponding pure TiO2 material was also synthesized for comparison. The performances and the physicochemical properties of these materials were compared to the well-known Evonik P25 photocatalyst.The physico-chemical characterizations showed that nano-crystalline anatase-brookite particles were produced with the sol-gel process, with higher specific surface area than P25 (~ 200 m 2 g -1 vs. 47 m 2 g -1 ). All samples presented a higher visible absorption than P25. The XPS spectra showed that all the samples were doped with nitrogen and that mixed TiO2-ZrO2 oxide materials were obtained when doping with zirconia precursor.Photoactivity was evaluated through the degradation of p-nitrophenol in water. On the one hand, under UV/visible light, the ZrO2 doping increased the degradation efficiency of the pure TiO2 catalyst due to a better charge separation in the mixed TiO2-ZrO2 oxides. The activity of the sample with the highest dopant content was even higher than the one of P25. On the other hand, under visible light, all samples were much more efficient than P25. This activity shift towards visible range was due to the N-doping of the catalysts, with a slight improvement for the doped ones.Finally, the feasibility of producing films starting from an aqueous suspension of the photocatalyst was assessed on P25, pure TiO2 and the best doped material. The photoactivity of these films, evaluated on the degradation of methylene blue under UV-A light, showed that the sample with the highest dopant concentration had an efficiency 4 times higher than pure TiO2 and 20 times higher than P25.

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Section: Introductionmentioning

confidence: 99%

Ambient temperature ZrO2-doped TiO2 crystalline photocatalysts: Highly efficient powders and films for water depollution

Mahy

Lambert

Tilkin

et al. 2019

Materials Today Energy

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“…For the Zr 3d spectrum of TiO2/N42/Zr2.8 sample (Figure 7d), peaks are visible at 182.0 eV and 184.6 eV that correspond to Zr 3d3/2 and Zr 3d5/2 electronic states [14,53,57,58]. They confirm the presence of ZrO2.…”

Section: Xps Analysismentioning

confidence: 72%

“…On the Ti 2p spectra (Figure 7a), for both samples, the Ti 2p1/2 and Ti 2p3/2 peaks are observed at 464.2 eV and 458.5 eV, respectively. They correspond to Ti 4+ species [27,52,53] and therefore the expected TiO2 [14]. In Figure 7b, the peak at 530.1 eV is linked to Ti-O bonds and is present for both samples [14,54].…”

Section: Xps Analysismentioning

confidence: 87%

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Green Synthesis of N/Zr Co-Doped TiO2 for Photocatalytic Degradation of p-Nitrophenol in Wastewater

Benkhennouche-Bouchene

Mahy

Wolfs

et al. 2021

Catalysts

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TiO2 prepared by a green aqueous sol–gel peptization process is co-doped with nitrogen and zirconium to improve and extend its photoactivity to the visible region. Two nitrogen precursors are used: urea and triethylamine; zirconium (IV) tert-butoxide is added as a source of zirconia. The N/Ti molar ratio is fixed regardless of the chosen nitrogen precursor while the quantity of zirconia is set to 0.7, 1.4, 2, or 2.8 mol%. The performance and physico-chemical properties of these materials are compared with the commercial Evonik P25 photocatalyst. For all doped and co-doped samples, TiO2 nanoparticles of 4 to 8 nm of size are formed of anatase-brookite phases, with a specific surface area between 125 and 280 m2 g−1 vs. 50 m2 g−1 for the commercial P25 photocatalyst. X-ray photoelectron (XPS) measurements show that nitrogen is incorporated into the TiO2 materials through Ti-O-N bonds allowing light absorption in the visible region. The XPS spectra of the Zr-(co)doped powders show the presence of TiO2-ZrO2 mixed oxide materials. Under visible light, the best co-doped sample gives a degradation of p-nitrophenol (PNP) equal to 70% instead of 25% with pure TiO2 and 10% with P25 under the same conditions. Similarly, the photocatalytic activity improved under UV/visible reaching 95% with the best sample compared to 50% with pure TiO2. This study suggests that N/Zr co-doped TiO2 nanoparticles can be produced in a safe and energy-efficient way while being markedly more active than state-of-the-art photocatalytic materials under visible light.

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“…The generated active species such as · O 2− , h + and · OH by the above initiated process react to decolourize the dye molecules to CO 2 , H 2 O or other products (Eq. 7) [64][65][66].…”

Section: Photocatalytic Mechanismmentioning

confidence: 99%

MnFe2O4/ZrO2 nanocomposite as an efficient magnetically separable photocatalyst with good response to sunlight: preparation, characterization and catalytic mechanism

Meena¹,

Anantharaju

Vidya³

et al. 2020

SN Appl. Sci.

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Magnetically separable novel nano-MnFe 2 O 4 /ZrO 2 nanocomposite (NC) and MnFe 2 O 4 (MFO) samples were synthesized by an efficient solution combustion methodology. The structure, morphology and optical properties were characterized through powder X-ray diffraction, scanning electron microscopy, Fourier-transform infrared spectroscopy and UV-Vis spectroscopy. The photocatalytic activity of MnFe 2 O 4 /ZrO 2 nanocomposite was analysed for decolourization efficiency of methylene blue (MB) and textile dye wastewater under natural sunlight irradiation. The results demonstrated that the decolourization response of the MnFe 2 O 4 /ZrO 2 nanocomposite was 95% for MB and 59% for textile dye wastewater in 90 min. The photocatalytic performance of MnFe 2 O 4 /ZrO 2 was almost 1.4 times as high as pure MnFe 2 O 4 was ascribed to the synergic effect and interfacial interaction across MnFe 2 O 4 nanoparticle (NP) and ZrO 2 that leads to separation of electron-hole pairs efficiently and broadened light absorption of the composite (2.42 eV) compared to MnFe 2 O 4 (2.15 eV). The effective optimized parameters such as solution pH of 7, nanocomposite dosage of 60 mg and initial dye concentration of 20 ppm were studied on photocatalytic performance for the removal of MB dye. The magnetically separable MnFe 2 O 4 / ZrO 2 nanocomposite proved to be highly active and a stable catalyst in five successive photodecolourization cycles for an aqueous solution of MB dye under sunlight irradiation. Furthermore, the possible sunlight photocatalytic mechanism of the MnFe 2 O 4 /ZrO 2 nanocomposite was proposed. Due to its enhancement in photocatalytic activity, this NC has great potential towards the environmental remediation for practical photocatalytic application towards wastewater treatment.

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Synthesis of mesoporous worm-like ZrO 2 –TiO 2 monoliths and their photocatalytic applications towards organic dye degradation

Cited by 45 publications

References 35 publications

Ambient temperature ZrO2-doped TiO2 crystalline photocatalysts: Highly efficient powders and films for water depollution

Ambient temperature ZrO2-doped TiO2 crystalline photocatalysts: Highly efficient powders and films for water depollution

Green Synthesis of N/Zr Co-Doped TiO2 for Photocatalytic Degradation of p-Nitrophenol in Wastewater

MnFe2O4/ZrO2 nanocomposite as an efficient magnetically separable photocatalyst with good response to sunlight: preparation, characterization and catalytic mechanism

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