A review of self-cleaning photocatalytic surface: Effect of surface characteristics on photocatalytic activity for NO

Li, Fen; Liu, Guanyu; Liu, Fuqiang; Yang, Sanqiang

doi:10.1016/j.envpol.2023.121580

Cited by 24 publications

(3 citation statements)

References 139 publications

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“…Microorganisms have varying levels of resistance to photocatalytic disinfection. The order of disinfection susceptibility is as follows: molds, yeasts, Gram-positive bacteria, Gram-negative bacteria, and viruses [97]. Thus, in the case of viruses, relatively few outer structures are present, offering less resistance to inactivation by photocatalysis; for bacteria, Gram-positive bacteria have higher peptidoglycan content than Gram-negative bacteria and, for this reason, are more resistant [98][99][100][101][102][103][104].…”

Section: Characteristics Of the Selected Studiesmentioning

confidence: 99%

Antimicrobial Activity of Photocatalytic Coatings on Surfaces: A Systematic Review and Meta-Analysis

Ubaldi,

Valeriani,

Volpini

et al. 2024

Coatings

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Photocatalytic technologies represent an innovative method to reduce microbial load on surfaces, even considering recent public health emergencies involving coronaviruses and other microorganisms, whose presence has been detected on surfaces. In this review paper, the antimicrobial efficacy of various photocatalysts applied by different coating methods on different surfaces has been compared and critically discussed. Publications reviewing the use of photocatalytic coatings on surfaces for antimicrobial effectiveness have been examined. Clear search parameters were employed to analyze the PubMed, Scopus, and WOS databases, resulting in 45 papers published between 2006 to 2023 that met the inclusion criteria. The paper assessed various types of photocatalytic coatings that targeted different microbial objectives. Based on the pooled data analysis, the TiO2 coating exhibited a substantial effect in decreasing bacteria strains, both Gram-positive and -negative (99.4%). Although the diversity of these technologies poses significant obstacles to obtaining a comprehensive final assessment of their effectiveness and feasibility for surface application, subgroup analysis indicated significant variations in the removal efficiency of Gram-positive strains based on different surface types (p = 0.005) and time of exposure (p = 0.05). Photocatalytic coatings provide a promising approach to combating the spread of microorganisms on surfaces. Further “in-field” investigations are necessary in the foreseeable future to explore and optimize this novel and exciting health technology.

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Section: Characteristics Of the Selected Studiesmentioning

confidence: 99%

Antimicrobial Activity of Photocatalytic Coatings on Surfaces: A Systematic Review and Meta-Analysis

Ubaldi,

Valeriani,

Volpini

et al. 2024

Coatings

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“…Along with the rapid development of the economy and continuous use of energy, environmental pollution and resource shortages have become very challenging problems. One of the harmful gaseous pollutants produced by the combustion of fossil fuels is NO, which not only causes acid rain but also affects the human respiratory system [1][2][3]. Currently, industrial treatment methods for NO x primarily include selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) [4].…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Bi-Modified Bi2Sn2O7 Nanosheets for Efficient Photocatalytic NO Removal

Li,

Zhao,

Zhang

et al. 2024

Catalysts

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The photocatalytic removal of nitric oxide (NO) is a promising technology used to reduce the level of harmful gaseous pollutants in parts per billion (ppb). As a potential photocatalyst, Bi2Sn2O7 has a low quantum efficiency due to its fast recombination rate of photo-generated carriers. In this paper, Bi/Bi2Sn2O7 was prepared by the in situ deposition of Bi. The structural, electrical, and optical properties of the attained sample were investigated through a series of analyses. The results demonstrate that Bi nanoparticles not only enhance the photoabsorption ability of Bi2Sn2O7 due to their surface plasmon resonance (SPR) effect, but also improve its photocatalytic activity. Photocatalytic performance was evaluated by the oxidation of NO at ppb level under xenon lamp (λ > 400 nm) irradiation. It was found that the photocatalytic NO removal rate increased from 7.2% (Bi2Sn2O7) to 38.6% (Bi/Bi2Sn2O7). The loading of Bi promotes the separation and migration of photo-generated carriers and enhances the generation of •O2− and •OH radicals responsible for the oxidation of NO. The Bi/Bi2Sn2O7 composite photocatalyst also exhibits excellent photocatalytic stability, which makes it a potential candidate for use in air purification systems.

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“…Second, the photo-induced superhydrophilicity under UV irradiation (water contact angle < 10 • ) leads to the spreading of water drops (formation of a water film) on the surface of the photocatalyst, preventing direct contact between external contaminants and the surface itself and washing them away [12,13]. The synergy of photocatalytic and superhydrophilic effects will promote and maintain the self-cleaning capacity of a surface to keep the aesthetic image of buildings unchanged over time [14,15], while helping to reduce air pollution [16] and mitigate the consequences of heat islands [17].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Self-Cleaning Property of Photocatalytic Coatings at a Laboratory Scale

Hot,

Castelló Lux,

Ringot

2023

Photochem

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Self-cleaning products are commercially available to protect surfaces against soiling and avoid the high consumption of energy and chemical detergents necessary for cleaning. They are based on semiconductor oxides, mostly titanium dioxide (TiO2), which induce photocatalytic oxidation activity and superhydrophilicity. Therefore, we present an experimental procedure at a lab scale to assess the self-cleaning ability of various photocatalytic coatings (five TiO2-based commercial products and one lab-grade zinc oxide (ZnO) product) applied to mortar surfaces. The samples were artificially stained with three types of soiling: Congo red dye, diesel soot, and motor oil. They were exposed to the environmental cycle of UV illumination and water flow for two weeks and the changes in stain colors were first assessed with visual inspection. Then, spectrophotometry measurements were conducted before and after the self-cleaning experiment to calculate the color differences for each stain in the CIELab color space data. In addition, the coatings were characterized via X-ray diffraction analyses and water contact angle measurements. Results highlighted color changes for each stain and higher wettability (induced by OH radicals) of the coated surfaces, which favored surface washing and thus stain removal. Light also had a positive effect on the attenuation of the stains, particularly for the Congo red dye.

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A review of self-cleaning photocatalytic surface: Effect of surface characteristics on photocatalytic activity for NO

Cited by 24 publications

References 139 publications

Antimicrobial Activity of Photocatalytic Coatings on Surfaces: A Systematic Review and Meta-Analysis

Antimicrobial Activity of Photocatalytic Coatings on Surfaces: A Systematic Review and Meta-Analysis

Plasmonic Bi-Modified Bi2Sn2O7 Nanosheets for Efficient Photocatalytic NO Removal

Investigation of the Self-Cleaning Property of Photocatalytic Coatings at a Laboratory Scale

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