金属有机骨架上的水钠锰矿型二氧化锰纳米片在臭氧分解中具有高催化活性,ACS Applied Nano Materials

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金属有机骨架上的水钠锰矿型二氧化锰纳米片在臭氧分解中具有高催化活性
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2023-04-21 , DOI: 10.1021/acsanm.3c00917
Yu-Hui Liu ₁ , Jia-Ao Lv ₁ , Ming-Ming Xu ₁ , Chen Dong ₁ , Xiao-Min Liu ₂ , Jian-Rong Li ₁ , Lin-Hua Xie ₁

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地面臭氧 (O ₃ ) 对人类健康和生态系统构成威胁；_{因此，O 3}分解催化剂的开发具有基础性和实际意义。在过去的几十年中，金属氧化物由于其低成本和高催化活性而被广泛研究用于消除O _{3 。}最近，已经证明金属有机框架（MOFs）在去除 O ₃甚至其他空气中的气态污染物的同时也表现出高性能。在此，我们报告了一种简便的合成方法来制备众所周知的 MOF、UiO-66-NH ₂和水钠锰矿型二氧化锰的复合物，即 δ-MnO ₂，其中 δ-MnO 的纳米片₂垂直排列并密集生长在UiO-66-NH ₂的晶体表面上。δ-MnO ₂ /UiO-66-NH ₂复合材料可在常温常压下以2000 L的空速完全去除干燥和高湿（RH = 80%）空气中的低浓度O ₃ （5 ppm）小时^–1克^–1。相反，δ-MnO ₂的单相样品或典型的O ₃分解催化剂α-MnO ₂在相同的实验条件下表现出低得多的O _{3去除效率。}由于 δ-MnO 的超薄形态（高表面积）和良好分离的分布（无聚集）δ-MnO ₂ /UiO-66-NH _{2复合材料中的}₂纳米片，其表面有丰富的Mn ²⁺ /Mn ^{3+原子和氧空位，有助于其在催化O}₃分解方面的高性能。_{这项工作展示了一种制备具有迷人纳米结构和对 O 3}分解具有高催化活性的 MOF 基复合材料的简便方法，这也可能用于其他催化反应。

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Birnessite-Type Manganese Dioxide Nanosheets on Metal–Organic Frameworks with High Catalytic Activity in Ozone Decomposition

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.

更新日期：2023-04-21

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