Photo-induced reactive oxygen species (ROS) are central to the selective oxidation of plastics and biomass, enabling efficient activation of inert C–H and C–C bonds under mild conditions—a crucial step toward bond cleavage and targeted functionalization. However, achieving precise control over the type, concentration, and spatial distribution of ROS remains challenging, especially for complex multicomponent substrates, as intermediate pathways depend critically on both ROS species and photocatalyst structure. This review systematically summarizes the formation and transformation mechanisms of radical and non-radical ROS and examines the direct role of photogenerated charges in oxidation. It demonstrates how rational catalyst design—through modulation of semiconductor properties, surface/interface structures, co-catalysts, and reaction conditions—can regulate ROS generation, evolution, and reactivity. Representative examples in plastic and biomass oxidation are discussed to illustrate how ROS and charge carriers drive selective depolymerization, monomer recovery, and functionalization via distinct mechanisms. Finally, this review highlights ongoing challenges in controlling ROS dynamics and elucidating their mechanistic roles, underscoring the need to correlate ROS behavior with reaction selectivity and product distribution.
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