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| Title: | Unraveling the mechanisms of room-temperature catalytic degradation of indoor formaldehyde and its biocompatibility on colloidal TiO2-supported MnOx-CeO2 | Authors: | Li, HW Huang, TT Lu, YF Cui, L Wang, ZY Zhang, CF Lee, SC Huang, Y Cao, JJ Ho, WK |
Issue Date: | 1-May-2018 | Source: | Environmental science : NANO, 1 May 2018, v. 5, no. 5, p. 1130-1139 | Abstract: | This work overcomes the limitations in room-temperature and moisture-dependent activity of transition metal oxide-based catalysts for sub-ppm formaldehyde removal. The active site exposure and selfassembly hydrophilicity were highlighted in MnOx-CeO2 (MCO) nanospheres after the loading of colloidal 2.1 wt% TiO2 particles (TO-MCO). Approximately 57% (relative humidity = 72%) and 41% (dry air) recycling catalytic activities at 35 degrees C were achieved. Our results proved that surface electron transfer, which was previously weakened because of the loss of surface oxygen species and unsuitable defect-site depositions of low active ions, in the MCO catalyst was recovered via the dispersion of hydrophilic Ti-O groups. This electron transfer was also strongly correlated with the specific surface area, porosity, and oxidation states of transition metals. The greater active site exposure derived from the cyclic electron transfer eventually enhanced the HCHO chemisorption and participation of oxygen species on the surface of TO-MCO throughout the bimetallic (Mn-Ce) dismutation reactions. The abundant superoxide radicals that were activated by these oxygen species prompted a nucleophilic attack on carbonyl bonds. Direct photoionization mass spectrometry determined formic acid, dioxirane (minor), and HOCH2OOH (little) as intermediates governing the HCHO selectivity to CO2. The cytotoxicity of catalysts exposed to yeast cells was evaluated for their potential environmentally friendly application indoors. | Publisher: | Royal Society of Chemistry | Journal: | Environmental science : NANO | ISSN: | 2051-8153 | EISSN: | 2051-8161 | DOI: | 10.1039/c8en00176f | Rights: | This journal is © The Royal Society of Chemistry 2018 The following publication Li, H., Huang, T., Lu, Y., Cui, L., Wang, Z., Zhang, C., ... & Ho, W. (2018). Unraveling the mechanisms of room-temperature catalytic degradation of indoor formaldehyde and its biocompatibility on colloidal TiO 2-supported MnO x–CeO 2. Environmental Science: Nano, 5(5), 1130-1139 is available at https://doi.org/10.1039/c8en00176f |
| Appears in Collections: | Journal/Magazine Article |
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| Li_Unraveling_Mechanisms_Room-Temperature.pdf | Pre-Published version | 1.52 MB | Adobe PDF | View/Open |
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