Catalytic ozone decomposition and adsorptive VOCs removal in bimetallic metal-organic frameworks

Abstract

Atmospheric ozone has long been a threat to human health, however, rational design of high-performance O3-decomposition catalysts remains challenging. Herein, we demonstrate the great potential of a series of isomorphous bimetallic MOFs denoted as PCN-250(Fe2M) (M = Co2+, Ni2+, Mn2+) in catalytic O3 decomposition. Particularly, PCN-250(Fe2Co) showed 100% O3 removal efficiency for a continuous air flow containing 1 ppm O3 over a wide humidity range (0 ‒ 80% RH) at room temperature. Mechanism studies suggested that the high catalytic performance originated from the introduction of open Co(II) sites as well as its porous structure. Additionally, at low pressures around 10 Pa, PCN-250(Fe2Co) exhibited high adsorption capacities (89 ‒ 241 mg g−1) for most VOCs, which are not only a class of hazardous air pollutants but also the precursor of O3. This work opens up a new avenue to develop advanced air purification materials for O3 and VOCs removal in one.

Reconstruction of Highly Dense Cu−N4Active Sites in Electrocatalytic Oxygen Reduction Characterized by Operando Synchrotron Radiation

“…Moreover, the CuÀ NÀ C/GC carries a much better ORR activity compared to the samples prepared from single support of CuÀ NÀ C/CNTs and CuÀ NÀ C/rGO (Figure S12), testifying the 3D structures composed of CNTs and graphene nanosheets and high-content Cu SAS could benefit to mass and electron transfer during the electrochemical process. [38][39][40][41] As illustrated in Figure S13 and Table S6, CuÀ NÀ C/GC displays the lowest Tafel slope of 64.9 mV dec À 1 , implying a fast kinetics towards ORR. Compared to the Cu SAS catalysts derived from different…”

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

“…Zang and co-workers prepared a manganese-based MOF, ZZU-281, which exhibited exceptionally high catalytic activity for O 3 decomposition over the entire humidity range . Recently, we demonstrated that a bimetallic MOF, PCN-250­(Fe 2 Co), could not only catalytically decompose O 3 but also adsorptively remove various VOCs from ambient air effectively, which are not only a class of hazardous air pollutants but also the precursor of O 3 . These works revealed that the catalytically active centers of MOFs for O 3 decomposition were their metal centers, and only some redox-active metal centers (Fe, Mn, and Co) could show high catalytic activity.…”

Exceptional Ozone Decomposition over δ-MnO2/AC under an Entire Humidity Environment

“…The World Health Organization (WHO) updated the Air Quality Guidelines (AQG) level of ambient O 3 concentration to 100 μg m –3 for 8 h of exposure on average in 2021 . O 3 is relatively stable at low concentrations and difficult to spontaneously decompose to O 2 in ambient air . Hence, it is of great significance to study O 3 pollution elimination for the sake of public health and the ecosystem.…”

“…In addition, the complex and harsh preparation process and expensive raw materials of MOF greatly limited them in mass production and industrial application . In particular, the structure of MOF may be destroyed by exposure to O 3 . , Therefore, it is of great scientific significance and application value to develop a stable water-resistant catalyst with high efficiency and low cost for O 3 elimination.…”