Amino groups modified MnOx-PUF applied in indoor air purification: removing formaldehyde at room temperature

Graphical An amino groups modified MnO x catalyst (DEA-MnO x -PUF) was prepared for HCHO removal. During the indoor environment, the catalyst shows higher HCHO removal efficiency (93.9 %) than that of unmodified MnO x -PUF catalyst (88.6 %). It is attributed to the continuous decomposition of intermediates during the catalytic process by amino groups cross-linked on the surface of the catalyst. Indoor formaldehyde (HCHO) pollution has more and more serious adverse effects on human health, it is urgent to develop a material that can be embedded in the air purifier to achieve HCHO's degradation efficiently. In this work, based on the carrier material of polyurethane foam (PUF) modified by amino groups diethanolamine (DEA), we propose a strategy to prepare a manganese oxide compound catalyst (DEA-MnO x -PUF). During the static testing (C HCHO : 11.591 ppm, T: 25 °C), the catalyst shows higher HCHO removal efficiency (93.9 %) than that of unmodified MnO x -PUF catalyst (88.6 %), and it achieves high HCHO-to-CO 2 conversion (68.5 %). Additionally, during the continuous single-pass catalysis testing (C HCHO : 11.591 ppm, T: 25 °C, 240000 mL/(g cat h)), HCHO removal efficiency can be maintained around at 95 % within 50 hours. The excellent performance is attributed to the continuous decomposition of intermediates during the catalytic process by amino groups cross-linked on the surface of the catalyst. Based on the block whole MnO x -based catalyst DEA-MnO x -PUF, this work will provide a new route to develop a powerful purifier material with long-term efficient removal of HCHO.