School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, PR China.
School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, PR China.
Environ Res. 2022 Sep;212(Pt C):113405. doi: 10.1016/j.envres.2022.113405. Epub 2022 May 5.
Photocatalysis technology is used to remove the low concentration NO in recent years. However, the effect of this process is not very satisfactory. In this study, it was found that the prepositive NaOH solution could significantly improve the photocatalytic NO removal activity of g-CN. The apparent quantum yield of g-CN in the NO removal process was increased 3.5 times by the prepositive NaOH solution. The reason is that there was a synergistic effect formed between the prepositive NaOH solution and the photocatalytic NO removal process. The prepositive NaOH solution not only could increase the humidity and pH value in the photocatalytic unit, but also could improve the adsorption ability of g-CN for the HO, NO, and O. Moreover, the prepositive NaOH solution reduced the difficulty of the photogenerated carriers' transport and the ·OH generation. This study provided a new idea for the removal of low-concentration NOx.
近年来，光催化技术被用于去除低浓度的 NO。然而，该过程的效果并不十分理想。在本研究中，发现预加 NaOH 溶液可以显著提高 g-CN 的光催化 NO 去除活性。预加 NaOH 溶液使 g-CN 在 NO 去除过程中的表观量子产率提高了 3.5 倍。原因是预加 NaOH 溶液与光催化 NO 去除过程之间形成了协同效应。预加 NaOH 溶液不仅可以增加光催化单元中的湿度和 pH 值，还可以提高 g-CN 对 HO、NO 和 O 的吸附能力。此外，预加 NaOH 溶液降低了光生载流子传输和·OH 生成的难度。本研究为去除低浓度 NOx 提供了新的思路。
