Plasmonic Photocatalysts for Microbiological Applications

Endo‐Kimura, Maya; Kowalska, Ewa

doi:10.3390/catal10080824

Cited by 29 publications

(16 citation statements)

References 140 publications

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“…Tian and Tatsuma proposed the electron transfer from photoexcited gold NPs (due to plasmon resonance) to CB of titania, with simultaneous transfer of compensative electrons from the solution to gold NPs (Tian and Tatsuma, 2005). Since then, many reports showed vis activity of NM modified widebandgap semiconductors, resulting from plasmonic activation, known as "plasmonic photocatalysis" (Furube et al, 2007;Kowalska et al, 2009;Mukherjee et al, 2013;Panayotov et al, 2013;Sugawa et al, 2015;Verbruggen, 2015;Verma et al, 2018;Endo-Kimura and Kowalska, 2020;Raja-Mogan et al, 2020;Wei et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Property-governed performance of platinum-modified titania photocatalysts

Wang

Kowalska

2022

Front. Chem.

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Titania is probably the most widely investigated semiconductor photocatalyst because of various advantages, such as high activity, thermal and chemical stability, low price, abundance, and negligible toxicity. However, pristine titania is also characterized by charge carriers’ recombination, and thus lower quantum yields of photocatalytic reactions than theoretical 100%. Moreover, its wide bandgap, despite being recommended for excellent redox properties, means also inactivity under visible part of solar radiation. Accordingly, titania has been surface modified, doped and coupled with various elements/compounds. For example, platinum deposited on the surface of titania has shown to improve both UV activity and the performance under vis. Although the studies on titania modification with platinum started almost half a century ago, and huge number of papers have been published up to now, it is unclear which properties are the most crucial and recommended to obtain highly efficient photocatalyst. In the literature, the opposite findings could be found on the property-governed activities that could result from huge differences in the reaction systems, and also examined photocatalysts. Considering the platinum properties, its content, the size of nanoparticles and the oxidation state, must be examined. Obviously, the characteristics of titania also influence the resultant properties of deposited platinum, and thus the overall photocatalytic performance. Although so many reports on Pt/TiO2 have been published, it is hardly possible to give indispensable advice on the recommended properties. However, it might be concluded that usually fine platinum NPs uniformly deposited on the titania surface result in high photocatalytic activity, and thus in the low optimal content of necessary platinum. Moreover, the aggregation of titania particles might also help in the lowering the necessary platinum amount (even to 0.2 wt%) due to the interparticle electron transfer mechanism between titania particles in one aggregate. In respect of platinum state, it is thought that it is highly substrate-specific case, and thus either positively charged or zero valent platinum is the most recommended. It might be concluded that despite huge number of papers published on platinum-modified titania, there is still a lack of comprehensive study showing the direct correlation between only one property and the resultant photocatalytic activity.

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Section: Introductionmentioning

confidence: 99%

Property-governed performance of platinum-modified titania photocatalysts

Wang

Kowalska

2022

Front. Chem.

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“…It should be pointed out that plasmonic photocatalysts have already exhibited photocatalytic activities for numerous reactions, including degradation of pollutants in both liquid and gas phases, inactivation of microorganisms, water splitting, solar energy conversion, and synthesis of organic compounds [2,3,33]. However, the level of activity under vis irradiation is much lower than that under UV (even by a few orders in magnitude).…”

Section: Introductionmentioning

confidence: 99%

TiO2/Au/TiO2 Plasmonic Photocatalysts: The Influence of Titania Matrix and Gold Properties

2022

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Plasmonic photocatalysts have gained more and more attention because of possible applications for solar energy conversion, environmental decontamination, and water treatment. However, the activity under visible light is usually very low, and the property-governed activity as well as the mechanisms are not fully understood yet. Accordingly, this study examines four different titania photocatalysts (anatase and rutile with fine and large crystallites) modified with gold by photodeposition. Three kinds of samples were prepared, as follows: (i) gold-modified titania (Au/TiO2), (ii) physically mixed Au/TiO2 samples (Au/TiO2(1) + Au/TiO2(2)), and (iii) Au/(TiO2(1) + Au/TiO2(2)) samples, prepared by subsequent deposition of gold on the mixture of bare and gold-modified titania. In total, twelve samples were prepared and well characterized, including diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning transmission electron microscopy (STEM). The photocatalytic activity was examined in three reaction systems: (i) methanol dehydrogenation during gold photodeposition under UV/vis irradiation, (ii) oxidative decomposition of acetic acid (UV/vis), and (iii) oxidation of 2-propanol to acetone under visible light irradiation (λ > 450 nm). It was found that during subsequent deposition, gold is mainly formed on the surface of pre-deposited Au nanoparticles (NPs), localized on fine titania NPs, through the electrostatic attractions (negatively charged gold resulting from photogenerated electrons’ accumulation). This gold aggregation, though detrimental for UV activity (many “naked” large titania with low activity), is highly beneficial for vis activity because of efficient light harvesting and increased interface between gold and titania (gold deposits surrounded by fine titania NPs). Moreover, it was found that rutile is more active than anatase for plasmonic photocatalysis, probably due to easier electron transfer from gold via titania to adsorbed oxygen (more negative conduction band), which might hinder the back reaction (electron transfer: Au→TiO2→Au).

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“…Figure 4b shows that the keywords colored in green to yellow (intermediate to high scores, which means that those keywords are frequent in recent years) belong mostly to the red cluster (Figure 4a), which shows that the current trend is to focus more on solar photocatalysis with TiO 2 and nanomaterials. Recent progress has been made in catalyst modification research to boost its light-harvesting capacity towards the visible; new Vislight active catalytic materials for disinfection have been tested, including plasmonic [60] and carbon nitride-based photocatalysts [61]. There have also been advances in disinfection with TiO 2 , based on the applications of its different types of structures (nanotubes, nanoparticles, nanofibers or nanopowder) doped with silver, selenium nanoparticles, ZnO, copper, zinc or yttrium, and for several waterborne microorganisms such as Escherichia coli, Staphylococcus aureus, Bacteriophages F2 and MS2, Cryptosporidium spp.…”

Section: Abstract' Trends and Progressmentioning

confidence: 99%

Worldwide Research Trends on Solar-Driven Water Disinfection

Martín

Brindley

Pérez

et al. 2021

IJERPH

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“Ensure access to water for all”, states Goal 6 of the UN’s Sustainable Development Goals. This worldwide challenge requires identifying the best water disinfection method for each scenario. Traditional methods have limitations, which include low effectiveness towards certain pathogens and the formation of disinfection byproducts. Solar-driven methods, such as solar water disinfection (SODIS) or solar photocatalysis, are novel, effective, and financially and environmentally sustainable alternatives. We have conducted a critical study of publications in the field of water disinfection using solar energy and, hereby, present the first bibliometric analysis of scientific literature from Elsevier’s Scopus database within the last 20 years. Results show that in this area of growing interest USA, Spain, and China are the most productive countries in terms of publishing, yet Europe hosts the most highly recognized research groups, i.e., Spain, Switzerland, Ireland, and UK. We have also reviewed the journals in which researchers mostly publish and, using a systematic approach to determine the actual research trends and gaps, we have analyzed the capacity of these publications to answer key research questions, pinpointing six clusters of keywords in relation to the main research challenges, open areas, and new applications that lie ahead. Most publications focused on SODIS and photocatalytic nanomaterials, while a limited number focused on ensuring adequate water disinfection levels, testing regulated microbial indicators and emerging pathogens, and real-world applications, which include complex matrices, large scale processes, and exhaustive cost evaluation.

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Plasmonic Photocatalysts for Microbiological Applications

Cited by 29 publications

References 140 publications

Property-governed performance of platinum-modified titania photocatalysts

Property-governed performance of platinum-modified titania photocatalysts

TiO2/Au/TiO2 Plasmonic Photocatalysts: The Influence of Titania Matrix and Gold Properties

Worldwide Research Trends on Solar-Driven Water Disinfection

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