Department of Environmental Research, University of Science and Technology (UST), Daejeon, 34113, Korea.
Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology (KICT), Goyang, 10223, Korea.
Sci Rep. 2023 Feb 9;13(1):2330. doi: 10.1038/s41598-023-29274-9.
In this study, we have demonstrated the application of sodium manganese oxide for the chemisorption of toxic acidic gases at room temperature. The fabricated alkali ceramic has NaMnO, NaMnO, and NaMnO phases with a surface area of 2.6 m g. Na-Mn oxide was studied for oxidation of HS, SO, and NO gases in the concentration range of 100-500 ppm. The material exhibited a high uptake capacity of 7.13, 0.75, and 0.53 mmol g for HS, SO, and NO in wet conditions, respectively. The material was reusable when regenerated simply by soaking the spent oxide in a NaOH-HO solution. While the HS chemisorption process was accompanied by sulfide, sulfur, and sulfate formation, the SO chemisorption process yielded only sulfate ions. The NO chemisorption process was accomplished by its conversion to nitrite and nitrate ions. Thus, the present work is one of the first reports on alkali ceramic utilization for room-temperature mineralization of acidic gases.
在这项研究中，我们展示了氧化锰钠在室温下吸附有毒酸性气体的应用。所制备的堿性陶瓷具有 NaMnO、NaMnO 和 NaMnO 相，比表面积为 2.6 m²/g。研究了 Na-Mn 氧化物对浓度范围在 100-500 ppm 的 HS、SO 和 NO 气体的氧化作用。该材料在湿条件下对 HS、SO 和 NO 的吸附容量分别高达 7.13、0.75 和 0.53 mmol/g。通过将用过的氧化物简单浸泡在 NaOH-H₂O 溶液中即可再生，该材料是可重复使用的。HS 的化学吸附过程伴随着硫化物、硫和硫酸盐的形成，而 SO 的化学吸附过程仅产生硫酸盐离子。NO 的化学吸附过程是通过将其转化为亚硝酸盐和硝酸盐离子来完成的。因此，本工作是第一篇关于堿性陶瓷在室温下矿化酸性气体的报告之一。
