Calculation method of quantum efficiency to TiO_2 nanocrystal photocatalysis reaction

Article type: Research Article

Authors: Xie, Yi-bing | Yuan, Chun-wei

Affiliations: National Laboratory of Molecular & Biomolecular Electronics,Southeast University, Nanjing, 210096, China. E-mail: ybxie@263.net

Abstract: The quantum yield is an important factor to evaluate the efficiency of photoreactor. This article gives an overall calculation method of the quantum efficiency(&b.Phi;) and the apparent quantum efficiency(&b.Phi;_2) to the TiO_2/UV photocatalysis system. Furthermore, for the immobility system (IS), the formulation of the faction of light absorbed by the TiO_2 thin film is proposed so as to calculate the quantum efficiency by using the measured value and theoretic calculated value of transmissivity (T). For the suspension system(SS), due to the difficulty to obtain the absorption coefficient (&b.alpha;) of TiO_2 particulates, the quantum efficiency is calculated by means of the relative photonic efficiency (&b.zeta;_r) and the standard quantum yield (&b.Phi;_standard).

Keywords: photodegradation reaction, absorption coefficient, relative photonic efficiency, photonic efficiency, apparent quantum efficiency, quantum efficiency

Journal: Journal of Environmental Sciences, vol. 14, no. 1, pp. 70-75, 2002