双锰矿
锰
分解
金属有机骨架
臭氧
材料科学
催化作用
化学工程
复合数
化学
无机化学
空间速度
纳米技术
选择性
复合材料
吸附
有机化学
冶金
氧化锰
工程类
作者
Yuhui Liu,Jia-Ao Lv,Mingming Xu,Chen Dong,Xiaomin Liu,Jian‐Rong Li,Lin‐Hua Xie
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2023-04-21
卷期号:6 (9): 7794-7801
被引量:7
标识
DOI:10.1021/acsanm.3c00917
摘要
Ground-level ozone (O3) poses a threat to both human health and ecosystems; the development of O3 decomposition catalysts is thus of fundamental and practical significance. In the past decades, metal oxides have been widely investigated for O3 elimination due to their low cost and high catalytic activity. Recently, it has been demonstrated that metal–organic frameworks (MOFs) could also show high performance in the removal of O3 and even other airborne gaseous pollutants at the same time. Herein, we report a facile synthetic method to prepare the composite of the well-known MOF, UiO-66-NH2, and birnessite-type manganese dioxide, namely, δ-MnO2, where the nanosheets of δ-MnO2 are vertically aligned and densely grown on the crystal surfaces of UiO-66-NH2. The δ-MnO2/UiO-66-NH2 composite could completely remove low-concentration O3 (5 ppm) in both dry and highly humid (RH = 80%) air at ambient temperature and pressure with a space velocity of 2000 L h–1 g–1. In contrast, a single-phase sample of δ-MnO2 or the typical O3 decomposition catalyst, α-MnO2, showed a much lower O3 removal efficiency under the same experimental conditions. Due to the ultrathin morphology (high surface area) and well-separated distribution (no aggregation) of δ-MnO2 nanosheets in the δ-MnO2/UiO-66-NH2 composite, there are rich Mn2+/Mn3+ atoms and oxygen vacancies on its surface, contributing to its high performance in catalytic O3 decomposition. This work demonstrated a facile method to prepare MOF-based composites with fascinating nanostructures and high catalytic activity in O3 decomposition, which are also potentially useful in other catalytic reactions.
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