Analysis of the photocatalytic activity of TiO2 coating on a glass as a criterion of its ability to self-cleaning

Abstract Herein we present a short review of different materials and techniques that have been used for the production of surfaces with self-cleaning and/or antimicrobial properties. From this, it was verified that titanium dioxide was the most frequently used compound to obtain surfaces with these properties; however, other materials such as silica, zinc and silver have also been used for this purpose. The spin-coating and dip-coating techniques were the most used techniques, and the bacteria Staphylococcus aureus and Escherichia coli were the most used in the antimicrobial assays. The analyzed studies showed that it is possible to obtain surfaces with both self-cleaning and/or antimicrobial properties, as well as with photocatalytic activity. Regarding possible applications, it is possible to highlight the interest in the production of glass and medical devices with self-cleaning and/or antimicrobial action.

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Preparation of self-cleaning surfaces with a dual functionality of superhydrophobicity and photocatalytic activity

Applied Surface Science ◽

10.1016/j.apsusc.2014.07.122 ◽

2014 ◽

Vol 319 ◽

pp. 367-371 ◽

Cited By ~ 27

Author(s):

Eun Ji Park ◽

Hye Soo Yoon ◽

Dae Han Kim ◽

Yong Ho Kim ◽

Young Dok Kim

Keyword(s):

Photocatalytic Activity ◽

Self Cleaning

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Effect of external bias voltage and coating thickness on the photocatalytic activity of thermal sprayed TiO2 coating

Progress in Organic Coatings ◽

10.1016/j.porgcoat.2007.09.030 ◽

2008 ◽

Vol 61 (2-4) ◽

pp. 321-325 ◽

Cited By ~ 12

Author(s):

Zeng Yi ◽

Cheng Guofeng ◽

Wen Ma ◽

Wu Wei

Keyword(s):

Photocatalytic Activity ◽

Bias Voltage ◽

Coating Thickness ◽

Tio2 Coating ◽

External Bias

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Self-cleaning durability assessment of TiO2/SiO2 photocatalysts coated concrete: Effect of indoor and outdoor conditions on the photocatalytic activity

Building and Environment ◽

10.1016/j.buildenv.2021.108743 ◽

2022 ◽

pp. 108743

Author(s):

Souad Khannyra ◽

Manuel Luna ◽

M.L. Almoraima Gil ◽

Mohammed Addou ◽

Maria J. Mosquera

Keyword(s):

Photocatalytic Activity ◽

Durability Assessment ◽

Self Cleaning ◽

Indoor And Outdoor

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Superhydrophobic and photocatalytic self-cleaning on cotton fabric using fluorine-free flower-like-TiO2/PDMS coatings

10.21203/rs.3.rs-404885/v1 ◽

2021 ◽

Author(s):

Esfandiar Pakdel ◽

Hai Zhao ◽

Jinfeng Wang ◽

Bin Tang ◽

Russell Varley ◽

...

Keyword(s):

Photocatalytic Activity ◽

Cotton Fabric ◽

Nitrogen Doping ◽

Dip Coating ◽

Polydimethyl Siloxane ◽

Water Contact ◽

Highly Efficient ◽

Coating Method ◽

Self Cleaning ◽

The Impact

Abstract This research presents the development of novel self-cleaning cotton fabric with dual functionalities of superhydrophobicity and photocatalytic activity. Fluorine-free coating formulations composed of either flower-like TiO2 or nitrogen-doped TiO2 particles, with a hierarchical surface morphology, and polydimethyl siloxane (PDMS) polymer were applied to cotton fabrics using a facile dip-coating method. The self-cleaning performance of fabrics was assessed based on their superhydrophobicity and effective removal of oil-based food stains. Additionally, the impact of nitrogen doping on photocatalytic activity of flower-like TiO2 particles was investigated. The obtained results demonstrated that the presence of both PDMS and hierarchical particles generated excellent superhydrophobicity on the cotton fabric with a water contact angle of 156.7 ± 1.9⁰. In addition, the coated fabric exhibited highly efficient photocatalytic activity, decomposing stains under simulated sunlight. Nitrogen doping process significantly boosted the photocatalytic activity of TiO2 particles in degrading stains and dye solution. The developed superhydrophobic fabric showed high robustness against both chemical and physical durability tests. This research contributes significantly to the continued advancement of highly efficient self-cleaning textiles via the development of dual functions of superhydrophobicity and photocatalytic activity.

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PHOTOCATALYTIC ACTIVE SELF-CLEANING CEMENT-BASED MATERIALS. COMPOSITIONS, PROPERTIES, APPLICATION

Bulletin of Belgorod State Technological University named after V G Shukhov ◽

10.34031/2071-7318-2020-5-3-16-25 ◽

2020 ◽

pp. 16-25

Author(s):

M. Antonenko ◽

Yu. Ogurtsova ◽

V. Strokova ◽

E. Gubareva

Keyword(s):

Photocatalytic Activity ◽

Diffusion Processes ◽

Photocatalytic Reaction ◽

Active Materials ◽

Concrete Mixtures ◽

Developed Surface ◽

Cement Based Materials ◽

Cement System ◽

Self Cleaning ◽

Prospects Of Application

The paper reviews the available technologies for producing photocatalytic active self-cleaning materials based on cement, including concretes and dry building mixtures. Used photocatalytic additives and their influence on the cement system are considered. The applied methods for assessing the photocatalytic activity of self-cleaning cement materials are presented. The compositions of concrete mixtures, their properties, areas and prospects of application are analyzed. The main problems of development, production and application of photocatalytic active self-cleaning materials based on cement are presented. The main directions to increase the self-cleaning ability of photocatalytic active materials based on cement are: optimization of the microstructure of the photocatalyst and the composite with its use in the direction of creating a developed surface of the photocatalyst - hierarchical microstructure; it intensifies the diffusion processes of photocatalytic reaction reagents and increases the contact area photocatalyst with a pollutant; it absorbs and accumulates ultraviolet radiation waves; optimization of the phase composition of titanium dioxide - search for the ratio of the anatase and rutile phases, at which the maximum photocatalytic activity is achieved; choosing of economically feasible method for periodical updating of the surface of concrete products carbonized during operation in order to restore self-cleaning ability.

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