The complex interplay between photons and catalytic powders in liquid-phase photocatalytic degradation reactions requires combined computational and experimental approaches to render a quantitative assessment of the light harvesting and handling properties the system. The full assessment of the light-to-chemical efficiency is here presented for the first of time for the complex 4-chlorophenol degradation. The reaction is carried out under different illumination conditions (UV, visible) with advanced, globular titania catalysts displaying high activity with respect to P25 and other reference materials. A critical issue, up to know not accounted for in the literature, is the effect that the different reaction products exerts in the use of charge carrier species by the catalytic system. Quantifying light effects in chemical conversion with explicit analysis of kinetically-relevant charge carrier species fate drives to correction(s) of the quantum efficiency observable, with a magnitude up to ca. 100%. The work outlines a novel and general procedure for the quantitative assessment of the real number of photons used in transforming pollutants through any liquid-phase photocatalytic process.

液相光催化降解反应中光子和催化粉末之间复杂的相互作用需要结合计算和实验方法来定量评估系统的光收集和处理性能。这里首次对复杂的 4-氯苯酚降解进行了光化学效率的全面评估。该反应在不同的光照条件（紫外线、可见光）下进行，先进的球状二氧化钛催化剂对 P25 和其他参考材料显示出高活性。一个关键问题，据了解，在文献中没有说明，是不同反应产物在催化系统使用电荷载流子物种时所产生的影响。通过对动力学相关的电荷载流子物种命运的明确分析来量化化学转化中的光效应，从而对可观察到的量子效率进行修正，幅度高达约 100%。这项工作概述了一种新颖的通用程序，用于通过任何液相光催化过程对用于转化污染物的实际光子数进行定量评估。