Title:
Photocatalytic Efficiency of Cement-Based Materials: Demonstration of Proposed Test Method
Author(s):
Amal R. Jayapalan, Bo Yeon Lee, Eva M. Land, Michael H. Bergin, and Kimberly E. Kurtis
Publication:
Materials Journal
Volume:
112
Issue:
2
Appears on pages(s):
219-228
Keywords:
characterization; photocatalysis; surface area; titania
DOI:
10.14359/51686985
Date:
3/1/2015
Abstract:
While there is an increasing interest in using photocatalytic cement-based materials, a lack of an appropriate standard procedure for testing the photocatalytic activity and efficiency of such materials makes comparisons among materials and data from different sources challenging. Current standard test methods are not appropriate for assessing photocatalytic nitrogen oxide conversion by cementitious materials because the standards do not consider surface properties of cementitious materials, nor are the test conditions appropriate for evaluation of cementitious materials. Therefore, the main objective is to propose a standard procedure for assessing the photocatalytic activity of cement mixtures with TiO2 additives and to define a parameter—the photocatalytic efficiency factor (PEF)—that could be used to compare the photocatalytic activity of different TiO2 cement mixtures, even for extended exposure conditions. The use of PEF is demonstrated, and values of PEF ranging from 8.40 to 51.55 μmol·h–1·m–2 (0.78 to 4.79 μmol·h–1·ft–2) was observed for mixtures with TiO2 up to 15% replacement.
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