Volatile organic compounds (VOCs) are attracting much more attention due to their contributions to air pollution and human health problems. Photothermal catalytic oxidation is considered as an energy-saving method for the removal of VOCs. However, the efficiency of the photothermal catalytic system is still suffering from the low activity of the catalyst due to its poor response to visible light and low efficiency of charge separation. Here, few-layer CoAl–LDH (layered double hydroxide) was prepared as an advantageous support for loading Pt nanoparticles to obtain Pt–LDH, which were coated on CeO2 nanoparticles. Type II heterojunctions were formed on the interface of LDH and CeO2. In photocatalysis, the hot electrons will move to CeO2, which is better at the activation of O2 molecules, and holes will concentrate on the LDHs, which have plenty of hydroxyls to generate •OH radicals. Furthermore, the Schottky heterojunctions between LDH and Pt nanoparticles benefit the improvement of light absorption by the localized surface plasmon resonance of Pt nanoparticles. As a consequence, a high removal rate of toluene (75.7%) at a weight-hourly space velocity of 23340 mL/(g·h) under visible light irradiation (160 mW/cm2, λ > 400 nm) at room temperature was achieved over the Pt–LDH/CeO2 catalyst. The catalyst design provides a useful method to prepare high-efficiency photothermal catalysts.
Photocatalytic removal of organic pollutants under solar irradiation at room temperature is considered an energy-saving technique of environmental remediation. However, photocatalysis is impeded by the poor response to visible light and fast charge recombination. In this work, sub-nano Pt/β-FeOOH quantum dots (QDs) were designed to shorten the charge migration path and obtain wide light harvesting. Interestingly, the crystalline β-FeOOH QDs can be obtained by loading sub-nano Pt particles via a reconstruction mechanism of amorphous FeOOH induced by H2 spillover, which facilitates the fast kinetics of charge transition and benefits the oxygen-rich surface of the catalyst for photocatalytic oxidation reactions. Moreover, the Pt-VO-Fe interfaces were proved to be the most active sites for the activation of O2. As a result, the catalyst exhibits a predominant photocatalytic performance in toluene oxidation, achieving a TOFPt of 0.591 min−1 at room temperature under visible light irradiation. This work provides a new perspective on the design and preparation of nanocatalysts for high-efficient photocatalysis under visible light irradiation.
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