Supercritical antisolvent precipitation of TiO2 with tailored anatase/rutile composition for applications in redox catalysis and photocatalysis

Marín, Raimon P.; Ishikawa, Satoshi; Bahruji, Hasliza; Shaw, Greg; Kondrat, Simon A.; Miedziak, Peter J.; Morgan, David; Taylor, Stuart Hamilton; Bartley, Jonathan K.; Edwards, Jennifer K.; Bowker, Michael; Ueda, Wataru; Hutchings, Graham J.

doi:10.1016/j.apcata.2015.02.023

Cited by 29 publications

(16 citation statements)

References 47 publications

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“…It is worthwhile to note that, as far as we know, only two papers were focused on the preparation by SAS process of TiO 2 to be used as photocatalyst [37,38]. Therefore, the effectiveness of SAS precipitation for photocatalytic applications is still unexplored.…”

Section: Introductionmentioning

confidence: 99%

Zinc Oxide Nanoparticles Obtained by Supercritical Antisolvent Precipitation for the Photocatalytic Degradation of Crystal Violet Dye

et al. 2019

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In this work, the synthesis of zinc oxide (ZnO) photocatalyst from thermal decomposition of zinc acetate (ZnAc) nanoparticles obtained by supercritical antisolvent (SAS) precipitation was investigated. The optimization of calcination conditions of the SAS ZnAc was carried out, studying the effect of temperature (in the range 300–600 °C) on the production of ZnO nanoparticles. In particular, it was demonstrated that the organic residues in ZnO and its particle size, thus the specific surface area, strongly affect the photocatalytic performances. SAS micronization of ZnAc produces regular nanoparticles with a mean diameter of about 54.5 ± 11.5 nm, whereas unprocessed ZnAc is characterized by very large crystals. The experimental results evidenced that ZnAc prepared by SAS process calcined at 500 °C showed a regular nanometric structure (mean diameter: 65.0 ± 14.5 nm) and was revealed to be the best choice for the photocatalytic removal of crystal violet dye (CV). In fact, the photocatalytic activity performances of ZnO nanoparticles prepared by this route were higher with respect to that of ZnO from unprocessed ZnAc calcined at 500 °C (which is characterized by irregular tetrapods with mean size 181.1 ± 65.5 nm). The optimized photocatalyst was able to assure the complete CV decolorization in 60 min of UV irradiation time and a mineralization degree higher than 90% after 120 min of treatment time.

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Section: Introductionmentioning

confidence: 99%

Zinc Oxide Nanoparticles Obtained by Supercritical Antisolvent Precipitation for the Photocatalytic Degradation of Crystal Violet Dye

et al. 2019

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“…The dispersion of noble metals on the surface of TiO 2 has been investigated with the purpose of enhancing the photocatalytic activity of TiO 2 , because metal particles can trap electrons, thus extending the electron-hole pair lifetime [83]. H 2 PtCl 6 was impregnated onto the surface of a TiO 2 photocatalyst prepared by supercritical anti-solvent precipitation (see Section 2.2) [84]. The obtained Pt/TiO 2 material calcined at 750 • C was found to have a comparable catalytic performance with Pt/P25 in the water splitting reaction under UV-Vis irradiation.…”

Section: Photocatalysismentioning

confidence: 99%

“…The Au-scCeO 2 and Au-Pd/scCeO 2 catalysts also gave better stability while the Au-Pd/unCeO 2 catalyst suffered gradual deactivation. A similar method was applied to prepare Au-Pd/scTiO 2 catalysts with good nanoparticle dispersion (Figure 16) for the oxidation of benzyl alcohol to benzaldehyde and the synthesis of H 2 O 2 [84].…”

Section: Supported Noble-metal Nanoparticles Catalystsmentioning

confidence: 99%

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Nanostructured Oxides Synthesised via scCO2-Assisted Sol-Gel Methods and Their Application in Catalysis

Tao

Pescarmona

2018

Catalysts

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Nanostructured metal oxides and silicates are increasingly applied in catalysis, either as supports or as active species in heterogeneous catalysts, owing to the physicochemical properties that typically distinguish them from bulk oxides, such as higher surface area and a larger fraction of coordinatively unsaturated sites at their surface. Among the different synthetic routes for preparing these oxides, sol-gel is a relatively facile and efficient method. The use of supercritical CO 2 (scCO 2) in the sol-gel process can be functional to the formation of nanostructured materials. The physical properties of the scCO 2 medium can be controlled by adjusting the processing temperature and the pressure of CO 2 , thus enabling the synthesis conditions to be tuned. This paper provides a review of the studies on the synthesis of oxide nanomaterials via scCO 2-assisted sol-gel methods and their catalytic applications. The advantages brought about by scCO 2 in the synthesis of oxides are described, and the performance of oxide-based catalysts prepared by scCO 2 routes is compared to their counterparts prepared via non-scCO 2-assisted methods.

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“…The semi-conductive photocatalysts generally used are titanium dioxide or titania (TiO 2 ) [ 21 , 22 , 23 ], ZnO [ 24 , 25 ], WO 3 [ 26 , 27 ], Fe 2 O 3 [ 28 , 29 ], CeO 2 [ 30 , 31 ], MoO 3 [ 32 , 33 ], ZrO 2 [ 34 , 35 ], SnO 2 [ 36 , 37 ], CdS [ 38 , 39 ], and ZnS [ 40 , 41 ]. Up to now, semiconductor-based photocatalysts in various forms have been proposed, mainly as nanopowders [ 42 , 43 , 44 , 45 , 46 , 47 , 48 ] or aerogels [ 49 , 50 , 51 , 52 , 53 , 54 ], due to the high specific surface area of these materials, resulting in a very high contact between the semiconductor and the fluid to be treated and, consequently, the photocatalytic performance could be enhanced.…”

Section: Introductionmentioning

confidence: 99%

Supercritical Carbon Dioxide-Based Processes in Photocatalytic Applications

et al. 2021

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Conventional methods generally used to synthesize heterogeneous photocatalysts have some drawbacks, mainly the difficult control/preservation of catalysts’ morphology, size or structure, which strongly affect the photocatalytic activity. Supercritical carbon dioxide (scCO2)-assisted techniques have recently been shown to be a promising approach to overcome these limitations, which are still a challenge. In addition, compared to traditional methods, these innovative techniques permit the synthesis of high-performance photocatalysts by reducing the use of toxic and polluting solvents and, consequently, the environmental impact of long-term catalyst preparation. Specifically, the versatility of scCO2 allows to prepare catalysts with different structures (e.g., nanoparticles or metal-loaded supports) by several supercritical processes for the photocatalytic degradation of various compounds. This is the first updated review on the use of scCO2-assisted techniques for photocatalytic applications. We hope this review provides useful information on different approaches and future perspectives.

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Supercritical antisolvent precipitation of TiO2 with tailored anatase/rutile composition for applications in redox catalysis and photocatalysis

Cited by 29 publications

References 47 publications

Zinc Oxide Nanoparticles Obtained by Supercritical Antisolvent Precipitation for the Photocatalytic Degradation of Crystal Violet Dye

Zinc Oxide Nanoparticles Obtained by Supercritical Antisolvent Precipitation for the Photocatalytic Degradation of Crystal Violet Dye

Nanostructured Oxides Synthesised via scCO2-Assisted Sol-Gel Methods and Their Application in Catalysis

Supercritical Carbon Dioxide-Based Processes in Photocatalytic Applications

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