PTEF-Photochemical Thermodynamic Efficiency Factor

The Photochemical Thermodynamic Efficiency Factor (PTEF) is an energy ratio equating the energy used to achieve the photocatalytic conversion of organic molecules over the energy absorbed by the photocatalyst. This parameter was first introduced by Serrano and de Lasa (1997) and evaluates the performance of photocatalytic reactors on a thermodynamic basis. 

If Qa represents the irradiation energy absorbed and Qi ed the irradiation energy used for the desired formation of OH radicals which then interact with adsorbed species, the reactor s efficiency can be defined as  

The PTEF is a generally applicable parameter as it is not restricted to either a homogenous or an heterogeneous photoconversion chemical process. 

More specifically, the Qused in the photoconversion process can be represented via the rOH Horn tP/n- group with the PTEF being represented by 

Alternatively, a PTEF definition can be introduced based on A, r the area of iiradi-ated catalyst, 

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Serrano and de Lasa (1997,1999) evaluated the efficiency of the photocatalytic conversion of organic pollutants using a PTEF (Photocatalytic Thermodynamic Efficiency Factor). This factor is based on both photochemical and thermodynamic principles. 

Furthermore, the extensive applicability of photocatalysis has essentially become a problem of energy efficiency. As a result, the quantification of these energy efficiency factors is a major issue. Thus, Chapter VI considers these factors from two perspectives quantum efficiencies and Photochemical Thermodynamic Efficiency Factor (PTEF), the latter being a new efficiency factor introduced by the authors. 

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