Yin Rongyang, Sun Pengfei, Cheng Lujun, Liu Tingting, Zhou Baocheng, Dong Xiaoping
Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou 310018, China.
Molecules. 2022 Aug 16;27(16):5216. doi: 10.3390/molecules27165216.
Much attention has been paid to developing effective visible light catalytic technologies for VOC oxidation without requiring extra energy. In this paper, a series of sponge-based catalysts with rich three-dimensional porosity are synthesized by combining MnOx and graphitic carbon nitride (GCN) with commercial melamine sponges (MS) coated with polydopamine (PDA), demonstrating excellent photothermal catalytic performance for formaldehyde (HCHO). The three-dimensional porous framework of MS can provide a good surface for material modification and a reliable interface for gas-solid interaction. The grown layer of PDA framework not only increases the near-infrared wavelength absorption for improving the light-to-heat conversion of catalysts, but also brings excellent adhesion for the subsequent addition of MnO and GCN. The efficient formaldehyde oxidation is attributed to the sufficient oxygen vacancies generated by co-loaded MnO and GCN, which is conducive to the activation of more O in the oxidation process. As the surface temperature of catalyst rapidly increases to its maximum value at ca. 115 °C under visible light irradiation, the HCHO concentration drops from 160 ppm to 46 ppm within 20 min. The reaction mechanism is certified as a classical Mars-van Krevelen mechanism based on the photo-induced thermal catalysis process.
人们已经对开发无需额外能量的用于挥发性有机化合物（VOC）氧化的有效可见光催化技术给予了极大关注。在本文中，通过将MnOₓ和石墨相氮化碳（GCN）与涂覆有聚多巴胺（PDA）的商用三聚氰胺海绵（MS）相结合，合成了一系列具有丰富三维孔隙率的海绵基催化剂，这些催化剂对甲醛（HCHO）表现出优异的光热催化性能。MS的三维多孔框架可为材料改性提供良好的表面，并为气固相互作用提供可靠的界面。生长的PDA框架层不仅增加了近红外波长吸收以提高催化剂的光热转换，还为后续添加MnO和GCN带来了优异的附着力。高效的甲醛氧化归因于共负载MnO和GCN产生的足够氧空位，这有利于在氧化过程中活化更多的O。在可见光照射下，催化剂的表面温度在约115℃迅速升至最大值，HCHO浓度在20分钟内从160 ppm降至46 ppm。基于光致热催化过程，反应机理被确认为经典的Mars-van Krevelen机理。
