What is the proposed photocatalytic mechanism for benzyl alcohol oxidation in the Pickering emulsion system?

Label:chem

Topic
Understanding the photocatalytic mechanism is crucial for optimizing the reaction conditions and improving the efficiency of the photocatalytic process.

From: "Solar-Driven Selective Benzyl Alcohol Oxidation in Pickering Emulsion Stabilized by CNTs/GCN Hybrids Photocatalyst", Catalysts 2025, 15(8), 753;
Answer
The proposed photocatalytic mechanism involves the excitation of GCN in the CNTs/GCN hybrid to generate electron–hole pairs. The photogenerated electrons migrate to the CNTs and are rapidly transported away, suppressing charge recombination. The electrons are scavenged by dissolved oxygen to form superoxide radicals (·O2−), which oxidize benzyl alcohol adsorbed on the photocatalyst surface. The photogenerated holes (h+) react with benzyl alcohol to form benzaldehyde through a deprotonation process. The high selectivity for benzaldehyde is due to the thermodynamically controlled oxidation pathway linked to the energy band structure of the photocatalyst.
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