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Determination of the photocatalytic activities of titanium dioxides and other white pigments
Author(s) -
Irick Gether
Publication year - 1972
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1972.070160917
Subject(s) - anatase , photodegradation , titanium dioxide , isopropyl alcohol , pigment , rutile , photocatalysis , acetone , materials science , zinc , chemistry , nuclear chemistry , organic chemistry , catalysis , metallurgy
Titanium dioxide, zinc oxide, and other white pigments are widely used in protective coatings and textile applications. An undesirable property of such pigments is their behavior as photo‐oxidation catalysts. As a measure of the activities of various pigments, quantum yields were determined for the photo‐oxidation of isopropyl alcohol to acetone in a system where the pigment was the only absorbing species. An absolute quantum yield of 0.5 was found for reagent‐grade anatase; relative quantum yields were determined for various commercial anatase and rutile titanium dioxides, zinc oxide, barium sulfate, and barium tungstate. A good correlation was found between the photodegradation rates of pigmented polypropylenes, the photodegradation rates of the dyes in pigmented cellulose acetate butyrate, and the activities of the pigments determined by the isopropyl alcohol oxidation method.