Hydrogen Production via Water Dissociation Using Pt–TiO2 Photocatalysts: An Oxidation–Reduction Network

Guayaquil‐Sosa, Jesus Fabricio; Calzada, Alan; Serrano, Benito; Escobedo, Salvador; Lasa, Hugo de

doi:10.3390/catal7110324

Cited by 26 publications

(18 citation statements)

References 9 publications

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“…Since Pd/TiO 2 has narrower bandgaps (direct, indirect) than Pt/TiO 2 , it performs in the Vis-light range better, increasing the efficiency of the photocatalysis. Determined values of indirect bandgap of TiO 2 (3.27eV) and Pt/TiO 2 (2.71 eV) ( Figure 1e) are consistent with the literature data for TiO 2 [13][14][15] and for Pt/TiO 2 [36,37]. It is well known that structure modification of TiO 2 with platinum and palladium nanoparticles (NPs) improves the quantum yield of photoconversion, as well as it shifts the light absorption of wide bandgap semiconductors to the Vis-light range [19].…”

Section: Characterization Of the Photocatalystssupporting

confidence: 88%

Solar Photocatalytic Degradation of Sulfamethoxazole by TiO2 Modified with Noble Metals

et al. 2019

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Application of solar photocatalysis for water treatment is intensively studied. In this work, we investigated TiO2 modified with platinum (Pt/TiO2) and palladium (Pd/TiO2) using sulfamethoxazole (SMX) as the model contaminant. We considered the following parameters: (i) level of TiO2 modification with Pt/Pd, (ii) initial concentration of photocatalysts, (iii) geographic location where processes were conducted, and (iv) natural water matrix. The catalysts characterized by SEM, EDX, DRS, and XRD techniques showed successful deposition of Pd and Pt atoms on TiO2 surface that enabled light absorption in the visible (Vis) range, and therefore caused efficient SMX removal in all tested conditions. A comparison of the rate constants of SMX degradation in various conditions revealed that modification with Pd gave better results than modification with Pt, which was explained by the better optical properties of Pd/TiO2. The removal of SMX was higher with Pd/TiO2 than with Pt/TiO2, independent of the modification level. In the experiments with the same modification level, similar rate constants were achieved when four times the lower concentration of Pd/TiO2 was used as compared with Pt/TiO2. Formation of four SMX transformation products was confirmed, in which both amine groups are involved in photocatalytic oxidation. No toxic effect of post-reaction solutions towards Lepidium sativum was observed.

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Section: Characterization Of the Photocatalystssupporting

confidence: 88%

Solar Photocatalytic Degradation of Sulfamethoxazole by TiO2 Modified with Noble Metals

et al. 2019

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“…This model was supported by experimental data (arrowed-lines) and sound assumptions (arrowed-dashed lines) [111]. Furthermore, this model has been used as a groundwork for further kinetic studies in the photoconversion of organic pollutants in water [112][113][114], air [8,31,33], and for hydrogen production [34,115] at the CREC-UWO laboratories. On the other hand, Imoberdorf et al (2005), proposed a more complex sequence of elementary reaction steps.…”

Section: Reaction Mechanism Developmentmentioning

confidence: 63%

Photocatalysis for Air Treatment Processes: Current Technologies and Future Applications for the Removal of Organic Pollutants and Viruses

Escobedo

Lasa

2020

Catalysts

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Photocatalysis for air treatment or photocatalytic oxidation (PCO) is a relatively new technology which requires titanium dioxide (TiO2) and a source of light (Visible or near-UV) to degrade pollutants contained in air streams. Present approaches for the photodegradation of indoor pollutants in air streams aim to eliminate volatile organic compounds (VOCs) and viruses, which are both toxic and harmful to human health. Photocatalysis for air treatment is an inexpensive and innovative green process. Additionally, it is a technology with a reduced environmental footprint when compared to other conventional air treatments which demand significant energy, require the disposal of used materials, and release CO2 and other greenhouse gases to the environment. This review discusses the most current and relevant information on photocatalysis for air treatment. This article also provides a critical review of (1) the most commonly used TiO2-based semiconductors, (2) the experimental syntheses and the various photocatalytic organic species degradation conversions, (3) the developed kinetics and computational fluid dynamics (CFD) and (4) the proposed Quantum Yields (QYs) and Photocatalytic Thermodynamic Efficiency Factors (PTEFs). Furthermore, this article contains important information on significant factors affecting the photocatalytic degradation of organic pollutants, such as reactor designs and type of photoreactor irradiation. Overall, this review describes state-of-the-art photocatalysis for air treatment to eliminate harmful indoor organic molecules, reviewing as well the potential applications for the inactivation of SARS-CoV2 (COVID-19) viruses.

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“…Recently, TiO 2 -based photocatalysts have been used in several applications, such as antimicrobial activity [1], water splitting [2], hydrogen production [3], carbon dioxide reduction [4], organic pollutant degradation [5][6][7][8], solar cells [9][10][11], batteries [12], and super capacitors [13,14]. Currently, the search has intensified for an abundant, inexpensive, efficient, safe, and recyclable photocatalyst that can be used for degradation of organic contaminants, for instance, methyl orange (MO) in wastewater treatment and/or water purification.…”

Section: Introductionmentioning

confidence: 99%

A C-Doped TiO2/Fe3O4 Nanocomposite for Photocatalytic Dye Degradation under Natural Sunlight Irradiation

et al. 2019

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Magnetically recyclable C-doped TiO2/Fe3O4 (C-TiO2/Fe3O4) nanocomposite was successfully synthesized via a sol–gel method. The synthesized samples were characterized using SEM, energy-dispersive X-ray spectroscopy (EDS), FTIR, and UV-VIS diffuse reflectance spectroscopy (DRS) techniques. The results clearly showed that a C-TiO2/Fe3O4 nanocomposite was produced. The photocatalytic activities of the prepared pristine (TiO2), C-doped TiO2 (C-TiO2) and C-TiO2/Fe3O4 were evaluated by the photodegradation of methyl orange (MO) under natural sunlight. The effect of catalyst loading and MO concentration were studied and optimized. The C-TiO2/Fe3O4 nanocomposite exhibited an excellent photocatalytic activity (99.68%) that was higher than the TiO2 (55.41%) and C-TiO2 (70%) photocatalysts within 150 min. The magnetic nanocomposite could be easily recovered from the treated solution by applying external magnetic field. The C-TiO2/Fe3O4 composite showed excellent photocatalytic performance for four consecutive photocatalytic reactions. Thus, this work could provide a simple method for the mass production of highly photoactive and stable C-TiO2/Fe3O4 photocatalyst for environmental remediation.

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Hydrogen Production via Water Dissociation Using Pt–TiO2 Photocatalysts: An Oxidation–Reduction Network

Cited by 26 publications

References 9 publications

Solar Photocatalytic Degradation of Sulfamethoxazole by TiO2 Modified with Noble Metals

Solar Photocatalytic Degradation of Sulfamethoxazole by TiO2 Modified with Noble Metals

Photocatalysis for Air Treatment Processes: Current Technologies and Future Applications for the Removal of Organic Pollutants and Viruses

A C-Doped TiO2/Fe3O4 Nanocomposite for Photocatalytic Dye Degradation under Natural Sunlight Irradiation

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