Decoupling Adsorption and Photocatalysis: Addressing the Dark Adsorption Pitfall in Catalyst Ranking
Anna Dougan-Bacha, Jordan E. Cox, Sarah K. St. Angelo
TL;DR
This paper addresses how adsorption effects can mislead rankings of photocatalysts and proposes a method to minimize these effects.
Contribution
A new low-concentration method is introduced to decouple adsorption and photocatalysis effects in catalyst evaluation.
Findings
Adsorption rates and capacities vary significantly among similar photocatalysts like ZnO-based materials.
Using a low-concentration approach changes catalyst rankings by minimizing dark adsorption effects.
Standard evaluation methods often fail to account for adsorption differences, leading to misleading results.
Abstract
Heterogeneous photocatalysis relies on the adsorption of the target molecule to the surface of the catalyst and the photocatalytic action of the material to degrade target molecules. In many reports, a 30 min dark adsorption time is used prior to exposure of the system to light and initiation of photocatalysis with no discussion of differences in adsorption rate or capacity when comparing catalystswhen adsorption rates or capacities are very different, misleading catalyst rankings may result. Even closely related materials, such as the ZnO-based photocatalysts discussed here, adsorb target molecules at different rates, have different adsorption capacities, and have apparently different photocatalytic rates. When typical methods for evaluating photocatalysts are used, the adsorption effects are not accounted for. Here, we illustrate potential concerns while evaluating photocatalysts and…
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Taxonomy
TopicsAdvanced Photocatalysis Techniques · TiO2 Photocatalysis and Solar Cells · Nanomaterials for catalytic reactions