Back to results list
Show full item record
Please use this identifier to cite or link to this item:
|Title:||Unraveling the mechanisms of room-temperature catalytic degradation of indoor formaldehyde and its biocompatibility on colloidal TiO2-supported MnOx-CeO2||Authors:||Li, HW
|Issue Date:||2018||Publisher:||Royal Society of Chemistry||Source:||Environmental science : NANO, May 2018, v. 5, no. 5, p. 1130-1139 How to cite?||Journal:||Environmental science : NANO||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.||URI:||http://hdl.handle.net/10397/79287||ISSN:||2051-8153||EISSN:||2051-8161||DOI:||10.1039/c8en00176f|
|Appears in Collections:||Journal/Magazine Article|
Show full item record
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.