TY - JOUR
T1 - Determination of quantum yields in two-dimensional scattering systems
AU - Du, Yikui
AU - Rabani, Joseph
PY - 2004/3/15
Y1 - 2004/3/15
N2 - A simple method for the determination of photochemical quantum yields (Φ) in light scattering system is proposed. The method is applied for two-dimensional (2D) reactors, such as photocatalytic layers, where scattered light can exit only through the front or rear surfaces. The determination of Φ is based on the measurement of both product formation rate, R, and the transmitted light (IT) in the 2D system, comparing two 2D reactors (layers with thickness L 1 and L 2, or suspensions with concentration C 1 and C 2), respectively. A good approximation of the quantum yield can be derived from the equation: Φ=(R2-R1)/(IT(1)-IT(2)), where the numbers in parenthesis refer to the given reactor. Satisfactory accuracy is obtained with "D1"=0.6-1 and "D2"=1.2-2, where " D 1" and " D 2" represent the respective apparent spectrophotometric absorbance of the 2D reactors. The method requires only a light intensity detector or a chemical actinometer. Systematic errors are discussed.
AB - A simple method for the determination of photochemical quantum yields (Φ) in light scattering system is proposed. The method is applied for two-dimensional (2D) reactors, such as photocatalytic layers, where scattered light can exit only through the front or rear surfaces. The determination of Φ is based on the measurement of both product formation rate, R, and the transmitted light (IT) in the 2D system, comparing two 2D reactors (layers with thickness L 1 and L 2, or suspensions with concentration C 1 and C 2), respectively. A good approximation of the quantum yield can be derived from the equation: Φ=(R2-R1)/(IT(1)-IT(2)), where the numbers in parenthesis refer to the given reactor. Satisfactory accuracy is obtained with "D1"=0.6-1 and "D2"=1.2-2, where " D 1" and " D 2" represent the respective apparent spectrophotometric absorbance of the 2D reactors. The method requires only a light intensity detector or a chemical actinometer. Systematic errors are discussed.
KW - Layers
KW - Light scattering
KW - Photolysis
KW - Quantum yield
KW - Titanium dioxide
UR - http://www.scopus.com/inward/record.url?scp=1342265012&partnerID=8YFLogxK
U2 - 10.1016/S1010-6030(03)00412-X
DO - 10.1016/S1010-6030(03)00412-X
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AN - SCOPUS:1342265012
SN - 1010-6030
VL - 162
SP - 575
EP - 578
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
IS - 2-3
ER -