Energy shortage and environmental pollution problems force us to find low-energy consumption methods to deal with volatile organic compounds (VOCs). In this work, Pt-P25 was synthesized through a simple wet impregnation method and calcination method. The study showed that different calcination temperatures and calcination atmospheres affected the activation state of Pt species, showing significant differences in the photothermal catalytic toluene oxidation reaction efficiency. The Pt-P25-800N sample activated in a nitrogen atmosphere at 800 °C exhibits better activity compared to other samples, achieving a toluene conversion rate of 95% and mineralization rate of 65% under a light intensity of 400 mW cm⁻². Characterization results demonstrate that low-valent Pt species are positively correlated with toluene oxidation activity and play a major role in the reaction. The ultraviolet (UV), visible (vis) and infrared (IR) components in the spectrum all contribute to the toluene oxidation process. The catalytic bed is heated to the required temperature mainly through thermal effects, thus overcoming the reaction energy barrier. The traditional photocatalytic process over TiO₂ also plays an auxiliary enhancement role. Due to the efficient conversion capability of the active sites, Pt-P25-800N achieves long-term stability of at least 50 hours under low light intensity input and water vapor conditions, accompanied by minimal accumulation of intermediate products. The above results reveal that the comprehensive effect between active Pt species and photothermal catalysis jointly achieves efficient degradation of VOCs and alleviates the energy and environmental crisis.

中文翻译：

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活性 Pt 物种和光驱动光热催化的协同组合用于高效甲苯氧化


能源短缺和环境污染问题迫使我们寻找低能耗的方法来处理挥发性有机化合物（VOC）。本工作通过简单的湿法浸渍法和煅烧法合成了Pt-P25。研究表明，不同的煅烧温度和煅烧气氛影响Pt物种的活化状态，光热催化甲苯氧化反应效率表现出显着差异。在800℃氮气气氛中活化的Pt-P25-800N样品与其他样品相比表现出更好的活性，在400mW cm ^-2的光强度下实现了95%的甲苯转化率和65%的矿化率。表征结果表明，低价Pt物种与甲苯氧化活性呈正相关，并在该反应中起主要作用。光谱中的紫外线 (UV)、可见光 (vis) 和红外线 (IR) 成分均有助于甲苯氧化过程。主要通过热效应将催化床加热到所需温度，从而克服反应能垒。传统的TiO ₂光催化过程也起到辅助增强作用。由于活性位点的高效转换能力，Pt-P25-800N在低光强度输入和水蒸气条件下实现了至少50小时的长期稳定性，同时中间产物的积累最小。上述结果表明，活性Pt物种与光热催化的综合作用共同实现了VOCs的高效降解，缓解了能源和环境危机。