Pt 纳米颗粒和氧空位协同作用促进甲苯的光热催化降解。
Combined effects of Pt nanoparticles and oxygen vacancies to promote photothermal catalytic degradation of toluene.
机构信息
College of Environment and Safety Engineering, Fuzhou University, Fuzhou 350108, China; Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; CAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; CAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
出版信息
J Hazard Mater. 2023 May 5;449:131041. doi: 10.1016/j.jhazmat.2023.131041. Epub 2023 Feb 18.
Pt/Mn-TiO photothermal catalysts with abundant oxygen vacancies are prepared by loading Pt onto a composite of MnO and TiO using MIL-125 as precursor (abbreviated as Mn-TiO) and subsequent hydrogen reduction treatment. Under light irradiation with intensity of 625 mW/cm, the optimal 0.65Pt/Mn-TiO catalyst can achieve toluene conversion of 90.4 % and CO yield of 85.6 %, respectively, and maintain stable activity for at least 30 h in the presence of coke and water. The introduction of Pt nanoparticles improves the utilization of solar spectrum and facilitates the generation of more oxygen vacancies. The comparative experiments of photothermal catalysis and thermal catalysis further verify that light not only acts as a heat source but also enhances catalytic reaction through photocatalysis and photoactivation of lattice oxygen. In the follow-up work, catalytic oxidation under natural sunlight is performed on 0.65Pt/Mn-TiO to reach 75.0 % of toluene conversion, displaying a good practical application potential.
采用 MIL-125 为前驱体制备了具有丰富氧空位的 Pt/Mn-TiO 光热催化剂（简称 Mn-TiO），然后进行氢气还原处理。在 625 mW/cm 的光辐照强度下，最佳的 0.65Pt/Mn-TiO 催化剂分别实现了 90.4%的甲苯转化率和 85.6%的 CO 产率，并且在存在焦炭和水的情况下至少稳定 30 小时保持活性。Pt 纳米粒子的引入提高了对太阳能光谱的利用率，并促进了更多氧空位的产生。光热催化和热催化的对比实验进一步证实，光不仅作为热源，而且通过光催化和晶格氧的光活化来增强催化反应。在后续工作中，在 0.65Pt/Mn-TiO 上进行了自然光下的催化氧化，达到了 75.0%的甲苯转化率，显示出良好的实际应用潜力。
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