Connecting contact angle evolution to photocatalytic kinetics of self cleaning surfaces

[Display omitted] •Kinetic constants and reaction order determined via contact angle measurements.•Cassie-Baxter model tested for both activation and self-cleaning processes.•Model demonstrates examples of first order and zero order cleaning kinetics. We demonstrate that the Cassie-Baxter model of c...

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Bibliographic Details
Published in:Catalysis today 2018-07, Vol.310, p.49-58
Main Author: Ollis, David
Format: Article
Language:English
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Summary:[Display omitted] •Kinetic constants and reaction order determined via contact angle measurements.•Cassie-Baxter model tested for both activation and self-cleaning processes.•Model demonstrates examples of first order and zero order cleaning kinetics. We demonstrate that the Cassie-Baxter model of contact angle for a composite surface consisting of “bare” and “covered” components (typically adventitious or purposeful carbonaceous deposits) can be used for quantitative determination of the kinetics of “self-cleaning” photocatalyst surfaces. In particular, literature data is analyzed to demonstrate examples of zero and first order reaction, as well as quantitative determination of rate constant values for two key processes: the initial activation of new photocatalysts, and the removal of purposeful fatty acid deposits such as that required in the ISO standard 27448: 2009 for activity determination of photocatalytic self-cleaning surfaces.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2017.09.051