Faculty of Engineering and IT, University of Technology, Sydney, P.O. Box 123, Broadway, NSW, 2007, Australia.
School of Chemical Engineering, Chonnam National University, Gwangju, 61186, South Korea.
Chemosphere. 2021 Jan;262:128004. doi: 10.1016/j.chemosphere.2020.128004. Epub 2020 Aug 20.
For the purpose of atmospheric NO removal, anatase TiO/g-CN photocatalytic composites were prepared by using a facile template-free calcination route in atmospheric conditions. Considerably fiscal NP400 and laboratory-grade melamine were used as the precursor of the composites. Additionally, samples were prepared with different wt. ratios of TiO and melamine by using two distinct calcination temperatures (550 °C/600 °C). The morphological attributes of the composites were assessed with X-ray diffraction, scanning and transmission electron microscopy, infrared spectroscopy, and X-ray photoelectron spectroscopy. Additionally, the optical traits were evaluated and compared using UV-visible diffuse reflectance spectroscopy and photoluminescence analysis. Finally, the photodegradation potentials for atmospheric NO by using the as-prepared composites were assessed under both UV and visible light irradiation. All the composites showed superior NO oxidation compared to NP400 and bulk g-CN. For the composites prepared by using the calcination temperature of 550 °C, the maximum NO removal was observed when the NP400 to melamine ratio was 1:2, irrespective of the utilized light irradiation type. Whereas for increased calcination temperature (600 °C), the maximum NO removal was observed at the precursor mix ratio of 1:3 (NP400:melamine). Successfully narrowed energy bandgaps were perceived in the as-prepared composites. Moreover, a subsequent drop in NO generation during NO oxidation was observed under both UV and visible light irradiation. Interestingly, higher calcination temperature during the synthesis of the catalysts has shown a significant drop in NO generation during the photodegradation of NO.
为了去除大气中的 NO，采用常压下简便的无模板煅烧法制备锐钛矿 TiO/g-CN 光催化复合材料。大量使用经济实惠的 NP400 和实验室级别的三聚氰胺作为复合材料的前体。此外，还使用两种不同的煅烧温度（550°C/600°C），通过不同的 TiO 和三聚氰胺的重量比来制备样品。使用 X 射线衍射、扫描和透射电子显微镜、红外光谱和 X 射线光电子能谱评估复合材料的形态特征。此外，使用紫外-可见漫反射光谱和光致发光分析来评估和比较光学特性。最后，在紫外光和可见光照射下，评估所制备的复合材料对大气 NO 的光降解潜力。与 NP400 和体相 g-CN 相比，所有复合材料均显示出优异的 NO 氧化性能。对于使用 550°C 煅烧温度制备的复合材料，当 NP400 与三聚氰胺的比例为 1:2 时，无论使用哪种光照类型，NO 的去除率均达到最大值。而对于升高的煅烧温度（600°C），在前驱体混合比为 1:3（NP400:三聚氰胺）时，NO 的去除率达到最大值。在制备的复合材料中观察到成功缩小的能带隙。此外，在紫外光和可见光照射下，NO 氧化过程中观察到 NO 生成量的后续下降。有趣的是，在催化剂的合成过程中升高煅烧温度，在 NO 的光降解过程中，NO 的生成量显著下降。
