Single Fe atom-anchored manganese dioxide for efficient removal of volatile organic compounds in refrigerator
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The efficient and rapid removal of volatile organic compounds (VOCs) holds significant importance for ensuring food quality and human health, particularly within the low-temperature confined spaces in refrigerators. However, achieving effective VOCs degradation under such conditions poses challenges in terms of activating inert bonds and facilitating mass transfer. In this study, we propose a novel solution by designing a cleaner module that incorporates 1.07% single Fe atom-anchored manganese dioxide catalysts (FeSAs-MnO2). The combination of single Fe atoms and defect-rich MnO2 substrate efficiently activates molecular oxygen, leading to enhanced generation of highly reactive oxygen species (ROS). Non-thermal plasma (NTP) and circulating fan are introduced to facilitate the regeneration of catalytic activity and improve mass transfer. The FeSAs-MnO2 cleaner module demonstrates exceptional performance in trimethylamine (TMA) removal, achieving a conversion efficiency of 98.9% for 9 ppm within just 9 min. Furthermore, accelerated aging tests predict an extended service life of up to 45 years for the FeSAs-MnO2 cleaner module, surpassing the expected lifespan of refrigerators significantly.
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This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB0450401), the National Natural Science Foundation of China (Nos. 92261105 and 22221003), the Anhui Provincial Natural Science Foundation (Nos. 2108085QB70 and 2108085UD06), the Anhui Provincial Key Research and Development Project (No. 2023z04020010), the Key Technologies Research and Development Program of Anhui Province (No. 2022a05020053), the Collaborative Innovation Program of Hefei Science Center, Chinese Academy of Sciences (No. 2021HSC-CIP002), and the Joint Funds from Hefei National Synchrotron Radiation Laboratory (Nos. KY2060000180 and KY2060000195). This work was partially carried out at the University of Science and Technology of China Center for Micro and Nanoscale Research and Fabrication. We acknowledge the Experimental Center of Engineering and Material Science in the University of Science and Technology of China. We thank the photo emission endstations BL1W1B in Beijing Synchrotron Radiation Facility (BSRF), BL14W1 in Shanghai Synchrotron Radiation Facility (SSRF), and BL10B and BL11U in National Synchrotron Radiation Laboratory (NSRL) for the help in characterizations.
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