Pt/TiO2 photocatalysts deposited on commercial support for photocatalytic reduction of CO2

Tasbihi, Minoo; Kočí, Kamila; Edelmannová, Miroslava; Troppová, Ivana; Reli, Martin; Schomäcker, Reinhard

doi:10.1016/j.jphotochem.2018.04.012

Cited by 66 publications

(25 citation statements)

References 29 publications

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“…An important consequence of this trapping effect is that the photogenerated electron can diffuse to the surface of the material and favor the reduction of the adsorbed nitrocompound. 34,60 This effect is not apparent when the catalyst is used without reduction; in fact, the photoreduction was only 45%.…”

Section: Photocatalytic Reduction Of 4-npmentioning

confidence: 99%

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Castañeda

Alvarado

Martínez

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Photoreduction of 4-nitrophenol (4-NP) photocatalytically to 4-aminophenol (4-AP) is considered a promising treatment of this recalcitrant pollutant. 4-aminophenol is widely applied as an intermediate in the pharmaceutical and agricultural industries. In this work, iridium/cerium dioxide (Ir/CeO 2 ) photocatalysts with different Ir contents (0.5, 1.0 and 2.0 wt%) were studied in the photoreduction of 4-NP using Na 2 SO 3 as hole scavengers under UV irradiation. In order to identify their physicochemical properties, the materials were studied by several techniques and photoactivity was monitored by UV-visible spectroscopy. RESULTS:The characterization results provided evidence that the modification of CeO 2 by impregnation of Ir causes a decrease in CeO 2 textural properties and its band gap energy. The photocatalytic reduction of 4-nitrophenol was enhanced by 26.1% using Ir/CeO 2 1.0 wt% in comparison with CeO 2 support. The phrase is related with the comparison between the photocatalytic behavior of Ir/CeO 2 1.0 wt% photocatalyst in regard the results evidenced with CeO 2 unmodified. An effect of the metal loading over photoactivity was observed and the optimal Ir content was 1.0 wt%. A reduction of 84% was obtained using 1.0 wt%Ir/CeO 2 , whereas for higher metal loading (2.0 wt%) 4-NP reduction decreased by 72%. CONCLUSION:The enhancement in the photocatalytic behavior of the Ir/CeO 2 series could be related to the presence of Ir + and Ir 0 species evidenced by X-ray photoelectron spectroscopy (XPS), thus, Ir + species could favor the adsorption of the pollutant and Ir 0 particles could act as trap of the photogenerated electrons that are responsible for reduction of the nitrocompound. The decrease in photoactivity when 2.0 wt% Ir/CeO 2 was used as photocatalyst could be associated with partial blockage of the surface active sites by increasing amounts of metal.

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Section: Photocatalytic Reduction Of 4-npmentioning

confidence: 99%

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Castañeda

Alvarado

Martínez

et al. 2019

J of Chemical Tech & Biotech

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“…[3] Various strategies have been applied in the development of visible-light active photocatalysts, including impurityd oping (e.g.,N:TiO 2 ), [4] surfacem odification (e.g.,p hosphates), [5] nanostructuring (e.g.,n anoneedles) [6] and the use of co-catalysts (e.g.,P t). [7] However,r ecent studies have shown that one of the most promising strategiesf or improving photocatalytic activity is to form ah eterojunction. [8] Ah eterojunction is defined as the interface between two dissimilars emiconductors.…”

Section: Introductionmentioning

confidence: 99%

Heterojunction α‐Fe₂O₃/ZnO Films with Enhanced Photocatalytic Properties Grown by Aerosol‐Assisted Chemical Vapour Deposition

Jiamprasertboon

Kafizas

Sachs

et al. 2019

Chemistry A European J

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Type Ih eterojunctionf ilms of a-Fe 2 O 3 /ZnO are reported here as an on-titania based photocatalyst, which shows remarkablee nhancement in the photocatalytic properties towards stearic acid degradationu nder UVA-light exposure (l = 365 nm), with aq uantum efficiencyo fx = 4.42 AE 1.54 10 À4 molecules degraded/photon, which was about 16 times greater than that of a-Fe 2 O 3 ,a nd 2.5 times greater than that of ZnO. Considering that the degradation of stearic acid requires 104 electron transfers for each molecule, this represents an overall quantum efficiency of 4.60 %f or the a-Fe 2 O 3 /ZnO heterojunction. Time-resolved transienta bsorption spectroscopy (TAS) revealed the charge-carrier behaviour responsible fort his increase in activity. Photogenerated electrons,f ormed in the ZnO layer,w ere transferred into the a-Fe 2 O 3 layer on the pre-mst imescale, whichr educed electron-hole recombination. This increasedt he lifetimeo fp hotogenerated holes formed in ZnO, which oxidise stearic acid. The heterojunction a-Fe 2 O 3 /ZnO films grown herein show potentiale nvironmental applicationsa sc oatings fors elfcleaningw indows and surfaces.

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“…In Table 1 , we have summarized Pt-TiO 2 based photocatalysts for CO 2 reduction in the previously reported literatures [ 10 , 17 , 19 , 20 , 21 , 22 , 24 , 27 , 34 , 35 , 36 , 37 ]. CO and CH 4 have commonly been observed as CO 2 reduction products, consistent with the present results.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic CO2 Reduction and Electrocatalytic H2 Evolution over Pt(0,II,IV)-Loaded Oxidized Ti Sheets

et al. 2020

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Energy recycling and production using abundant atmospheric CO2 and H2O have increasingly attracted attention for solving energy and environmental problems. Herein, Pt-loaded Ti sheets were prepared by sputter-deposition and Pt4+-reduction methods, and their catalytic activities on both photocatalytic CO2 reduction and electrochemical hydrogen evolution were fully demonstrated. The surface chemical states were completely examined by X-ray photoelectron spectroscopy before and after CO2 reduction. Gas chromatography confirmed that CO, CH4, and CH3OH were commonly produced as CO2 reduction products with total yields up to 87.3, 26.9, and 88.0 μmol/mol, respectively for 700 °C-annealed Ti under UVC irradiation for 13 h. Pt-loading commonly negated the CO2 reduction yields, but CH4 selectivity was increased. Electrochemical hydrogen evolution reaction (HER) activity showed the highest activity for sputter-deposited Pt on 400 °C-annealed Ti with a HER current density of 10.5 mA/cm2 at −0.5 V (vs. Ag/AgCl). The activities of CO2 reduction and HER were found to be significantly dependent on both the nature of Ti support and the oxidation states (0,II,IV) of overlayer Pt. The present result could provide valuable information for designing efficient Pt/Ti-based CO2 recycle photocatalysts and electrochemical hydrogen production catalysts.

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Pt/TiO2 photocatalysts deposited on commercial support for photocatalytic reduction of CO2

Cited by 66 publications

References 29 publications

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Heterojunction α‐Fe₂O₃/ZnO Films with Enhanced Photocatalytic Properties Grown by Aerosol‐Assisted Chemical Vapour Deposition

Photocatalytic CO2 Reduction and Electrocatalytic H2 Evolution over Pt(0,II,IV)-Loaded Oxidized Ti Sheets

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Pt/TiO2 photocatalysts deposited on commercial support for photocatalytic reduction of CO2

Cited by 66 publications

References 29 publications

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO2 photocatalysts under UV irradiation

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO2 photocatalysts under UV irradiation

Heterojunction α‐Fe2O3/ZnO Films with Enhanced Photocatalytic Properties Grown by Aerosol‐Assisted Chemical Vapour Deposition

Photocatalytic CO2 Reduction and Electrocatalytic H2 Evolution over Pt(0,II,IV)-Loaded Oxidized Ti Sheets

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Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Heterojunction α‐Fe₂O₃/ZnO Films with Enhanced Photocatalytic Properties Grown by Aerosol‐Assisted Chemical Vapour Deposition