Study of the visible light activity of Pt and Au-TiO2 photocatalysts in organic pollutants degradation

Cubillos-Lobo, Jairo Antonio; Mesa, Julie Joseane Murcia; Romero, Jhonatan R. Guarín; Rojas, Hugo; Hidalgo, M.C.; Navı́o, J.A.

doi:10.17533/udea.redin.n83a03

Cited by 6 publications

(4 citation statements)

References 33 publications

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“…The percentage of oxidized Pt phase was higher than that of the Pt metallic phase. The presence of Pt oxide phases along with the metallic Pt causes the photosensitization of Pt/TiO 2 samples to absorb visible light, − which was reflected in the optical absorbance of Pt/TiO 2 , as observed from UV–vis spectra . Overall, Pt present in Pt/TiO 2 existed in two chemical states, namely, Pt metallic and PtO and/or Pt(OH) 2 .…”

Section: Resultsmentioning

confidence: 98%

Green Hydrogen Production in an Optofluidic Planar Microreactor via Photocatalytic Water Splitting under Visible/Simulated Sunlight Irradiation

Pala

Peela

2021

Energy Fuels

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The visible light-active Pt/TiO2 photocatalyst thin films were prepared by photo-depositing Pt onto the sol–gel TiO2 spin-coated films. An optofluidic planar microreactor was fabricated using a Pt/TiO2 film-coated glass substrate as the bottom plate and an uncoated glass substrate containing a planar reaction chamber as the cover plate. The Pt/TiO2 thin films were tested for the photocatalytic water splitting activity in the presence of methanol as the sacrificial agent to produce hydrogen under visible/solar light irradiation. The effect of catalyst film thickness, reactant flow rate, light intensity, and type of light source on the rate of hydrogen production was studied. The Pt/TiO2 film with a thickness of 1650 ± 119 nm showed a highest rate of 16.35 mmol h–1 g–1 (4.7 μmol h–1 cm–2) hydrogen production at an optimum reactant flow rate of 0.3 mL min–1 under visible light (400 W metal halide lamp) irradiation. The stability study carried out for four cycles of 5 h runs proved that the photocatalyst was stable and the film was well adhered to the glass substrate. A hydrogen production rate of 0.766 mmol h–1 g–1 (0.22 μmol h–1 cm–2) and a solar to hydrogen conversion efficiency of 0.015% were obtained under a simulated solar light irradiation of ∼100 mW cm–2 intensity, proving the solar light activity of the Pt/TiO2 film.

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Section: Resultsmentioning

confidence: 98%

Green Hydrogen Production in an Optofluidic Planar Microreactor via Photocatalytic Water Splitting under Visible/Simulated Sunlight Irradiation

Pala

Peela

2021

Energy Fuels

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“…Thus, the efficiency of photocatalytic processes is generally controlled by the rate of formation of hydroxyl radicals 8 . In the last years, different topics were the object of research aimed mainly to increase the pollutants degradation rate: (i) improvement of the catalyst properties (for example, shifting the photoactivity into the visible light region); 9–13 (ii) use of more efficient artificial light sources (LEDs and optical fibers) and solar light; 8,14–19 (iii) use of macroscopic supports for recovering the photocatalyst after the process; –24 and (iv) optimization of photoreactor configuration 8 . Such aspects have been investigated extensively from an experimental point of view.…”

Section: Introductionmentioning

confidence: 99%

Main parameters influencing the design of photocatalytic reactors for wastewater treatment: a mini review

Sacco

Vaiano

Sannino

2020

J of Chemical Tech & Biotech

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The research in the heterogeneous photocatalysis to remove different types of pollutants in liquid phase has notably increased in the last years. The main objectives of the research dealing with photocatalysis were: (i) to shift the photoactivity of catalysts in the visible light range or to increase the degradation rate; (ii) the use of the artificial light sources (low pressure lamp, high pressure lamp, LEDs, and optical fibers) and solar light; (iii) photocatalysts recovering and deactivation; (iv) photoreactor configuration; (v) photodegradation of contaminants of emerging concern; and (vi) verification of induced effects from the photocatalytic treatment, such as the induction of bacterial resistance. Here, one of the main problems in the practical application of photocatalysis, which is the photoreactors scale‐up, is addressed with the use of mathematical modeling. In this perspective, this mini review reports a literature exam of the main parameters that are important to take into account for the design and the development of photoreactors for wastewater treatment, and through the use of computational fluid dynamics models (CFD). © 2020 Society of Chemical Industry

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“…The apparent pseudo-first order kinetics constants were compared with the literature and are reported in Table 3. Our system at the optimal operative conditions Pd(0.25%)/Cr-TiO 2 Visible AO7 0.041 [48] Pt(0.3%)/S-TiO 2 Visible Methyl Orange 0.017 [49] Cu(10%)/TiO 2 Visible Methyl Orange 0.001 [50] Pt(1%)/TiO 2 Visible Reactive Black 5 0.001 [51] Fe-N-TiO 2 Visible AO7 0.03 [47] Fe-Pr-TiO 2 Visible AO7 0.0325…”

Section: Literature Comparisonmentioning

confidence: 99%

Ag/Cr-TiO2 and Pd/Cr-TiO2 for Organic Dyes Elimination and Treatment of Polluted River Water in Presence of Visible Light

et al. 2023

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In this work, photocatalytic materials constituted by Cr-doped TiO2 (Cr-TiO2) decorated with noble metals show high effectiveness in the mineralization of Acid Orange 7 (AO7) and in the disinfection of real river water. The materials were firstly obtained by sol-gel method to get Cr-TiO2 that was subsequently modified by photochemical deposition of Ag or Pd nanoparticles (Ag/Cr-TiO2, Pd/Cr-TiO2). Chemical-physical characterization results evidenced that the noble metals were homogeneously distributed on the Cr-TiO2 surface. By using Pd(0.25%)/Cr-TiO2, the AO7 discoloration efficiency was about 91.4% after only 60 min of visible irradiation, which can be due to the lowest band gap of this material. Moreover, nitrates, chlorides, total hardness, and coliform bacteria content significantly decreased after the treatment of real river water samples (that is contaminated by industrial and domestic effluents) under UV and visible light irradiation in the presence of TiCrOx decorated with noble metals. One hundred percent of elimination rate for E. coli, total coliforms, and other enterobacteriaceae (without regrowth) was achieved by using Ag/Cr-TiO2 as photocatalyst.

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Study of the visible light activity of Pt and Au-TiO2 photocatalysts in organic pollutants degradation

Cited by 6 publications

References 33 publications

Green Hydrogen Production in an Optofluidic Planar Microreactor via Photocatalytic Water Splitting under Visible/Simulated Sunlight Irradiation

Green Hydrogen Production in an Optofluidic Planar Microreactor via Photocatalytic Water Splitting under Visible/Simulated Sunlight Irradiation

Main parameters influencing the design of photocatalytic reactors for wastewater treatment: a mini review

Ag/Cr-TiO2 and Pd/Cr-TiO2 for Organic Dyes Elimination and Treatment of Polluted River Water in Presence of Visible Light

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