A series of TiO2, TiO2/Pd, and TiO2/PdO hollow sphere photocatalysts was successfully prepared via a combination of hydrothermal, sol-immobilization, and calcination methods. The structure and optical properties of the as-prepared samples were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Telleranalysis, Barrett-Joyner-Halenda measurement, and UV-Vis diffuse reflectance spectroscopy. The photocatalysis efficiencies of all samples were evaluated through the photocatalytic degradation of rhodamine B under visible light irradiation. Results indicated that TiO2/PdO demonstrated a higher photocatalytic activity (the photocatalytic degradation efficiency could reach up to 100% within 40 min) than the other samples and could maintain a stable photocatalytic degradation efficiency for at least four cycles. Finally, after using different scavengers, superoxide and hydroxyl radicals were identified as the primary active species for the effectiveness of the TiO2/PdO photocatalyst.
Huimin Jia,Ya Wang,Yiting Yang,Chuang Liu,Weiwei He
Constructing a multi-interface synergistic catalytic system represents an effective strategy for developing highly efficient photocatalysts; however, the challenge lies in fabricating ideal heterojunctions that can fully harness the multiple synergistic effects of the components. In this study, a series of TiO2/Pd/Ti3C2 nanocomposite photocatalysts with 2D/0D/2D heterojunctions were successfully fabricated through a combination of photoreduction and electrostatic self-assembly techniques by varying the mass ratios. Under irradiation from a 300 W xenon lamp, the as-constructed TiO2/3% Pd/1% Ti3C2 heterojunction photocatalyst exhibited a significantly enhanced H2 evolution rate of 21.60 mmol h−1 g−1, which was approximately 135-fold and 25.4-fold higher than those of pristine TiO2 nanosheets (NSs) and TiO2/1% Ti3C2, respectively. Electrochemical impedance spectroscopy, photoluminescence spectroscopy, and electron spin resonance analysis collectively revealed that the enhanced photocatalytic performance can be attributed to the formation of a synergistic catalytic interface among the TiO2 NSs, highly active Pd NPs, and monolayer Ti3C2 nanosheets. This interface facilitated efficient charge separation, shortened the charge transfer pathways, and enhanced the generation of reactive oxygen species. This study presents a promising strategy for improving catalytic performance through multi-interface synergy and offers a preliminary investigation into the underlying synergistic mechanisms using multiple characterization techniques.
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