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A Method to Compare the Activities of Semiconductor Photocatalysts in Liquid−Solid Systems
Author(s) -
Megatif Lena,
Dillert Ralf,
Bahnemann Detlef W.
Publication year - 2018
Publication title -
chemphotochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.13
H-Index - 18
ISSN - 2367-0932
DOI - 10.1002/cptc.201800134
Subject(s) - photocatalysis , dichloroacetic acid , semiconductor , suspension (topology) , materials science , volume (thermodynamics) , reaction rate constant , analytical chemistry (journal) , chemical engineering , chemistry , nanotechnology , chromatography , optoelectronics , organic chemistry , physics , catalysis , thermodynamics , kinetics , mathematics , quantum mechanics , homotopy , pure mathematics , engineering
A method to determine the activity of semiconducting photocatalysts in liquid–solid systems is suggested employing a black body photoreactor. The reaction rates, defined as the converted amount of the probe molecule per unit time (d n /d t ), in the presence of nine different photocatalysts, were found to be constant and not affected by the initial concentration of the probe compound dichloroacetic acid ( c 0 ), the mass concentration of the photocatalyst ( γ ), and the suspension volume (when c 0 and γ are larger than 5 mM and 1 g L −1 , respectively). The method presented here thus seems to be generally applicable to obtain experimental data allowing the comparison of the photocatalytic activities of different semiconductors.