State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes, Tiangong University, Tianjin, 300387, China.
School of Environmental Science and Engineering, Tiangong University, Tianjin, 300387, China.
Environ Sci Pollut Res Int. 2023 Feb;30(7):17994-18013. doi: 10.1007/s11356-022-23440-8. Epub 2022 Oct 7.
Ozone air pollution poses a serious threat to human health and ecological environment. Manganese oxide (MnOx) is a popular material for ozone decomposition with excellent catalytic performance. However, the catalytic activity may be reduced under high-humidity conditions because of oxygen vacancy of MnOx from the water evaporation. In this paper, a new type of MnOx/poly(acrylic acid-co-divinylbenzene) (PAA) catalyst with MnOx supported on hollow PAA was successfully prepared, which greatly improved the ozone decomposition efficiency under high humidity. It was shown that when the acrylic acid (AA) content was more than 50%, the PAA polymer layer was hydrophilic and the ozone decomposition efficiency would keep high activity for both the low- and high-humidity conditions. The best performance of ozone decomposition was identified for the methanol reduction and AA content of 60%, in which the efficiencies reached 94.5% and 85% at 50% and 90% humidity levels, respectively. It is the synergetic effect of the hydrophilic PAA support and hollow structure that retains and improves the decomposition activity, which can absorb the water vapor molecules and increase the ozone retention time. Therefore, the hollow microsphere catalyst prepared in this paper has great potential in solving the problem of ozone air pollution.
臭氧空气污染对人类健康和生态环境构成严重威胁。氧化锰 (MnOx) 是一种用于臭氧分解的流行材料，具有出色的催化性能。然而，由于 MnOx 的氧空位来自水蒸发，其催化活性可能会在高湿度条件下降低。在本文中，成功制备了一种新型的 MnOx/聚(丙烯酸-co-二乙烯基苯)（PAA）催化剂，将 MnOx 负载在中空 PAA 上，大大提高了高湿度下的臭氧分解效率。结果表明，当丙烯酸 (AA) 含量超过 50%时，PAA 聚合物层具有亲水性，臭氧分解效率在低湿度和高湿度条件下均保持高活性。甲醇还原和 AA 含量为 60%时，臭氧分解的性能最佳，在 50%和 90%的湿度水平下，效率分别达到 94.5%和 85%。正是亲水性 PAA 载体和中空结构的协同效应保留并提高了分解活性，它可以吸收水蒸气分子并增加臭氧保留时间。因此，本文制备的中空微球催化剂在解决臭氧空气污染问题方面具有巨大的潜力。
