| Unraveling the mechanisms of room-temperature catalytic degradation of indoor formaldehyde and its biocompatibility on colloidal TiO2-supported MnOx-CeO2 | |
| Li, Haiwei1; Huang, Tingting2; Lu, Yanfeng2; Cui, Long1; Wang, Zhenyu2,3; Zhang, Chaofeng2; Lee, Shuncheng1; Huang, Yu2; Cao, Junji2,3; Ho, Wingkei4 | |
| 2018-05-01 | |
| 发表期刊 | ENVIRONMENTAL SCIENCE-NANO
 |
| 卷号 | 5期号:5页码:1130-1139 |
| 文章类型 | Article |
| 摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences ; Life Sciences & Biomedicine |
| DOI | 10.1039/c8en00176f |
| 关键词[WOS] | OXYGEN REDUCTION REACTION ; AMBIENT-TEMPERATURE ; CRIEGEE INTERMEDIATE ; OXIDATION ; REMOVAL ; NO ; SURFACE ; OXIDE ; MNO2 ; AIR |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Chemistry ; Environmental Sciences & Ecology ; Science & Technology - Other Topics |
| WOS类目 | Chemistry, Multidisciplinary ; Environmental Sciences ; Nanoscience & Nanotechnology |
| WOS记录号 | WOS:000432684200009 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ieecas.cn/handle/361006/5145 |
| 专题 | 粉尘与环境研究室 |
| 作者单位 | 1.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R China 2.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Xian 710061, Shaanxi, Peoples R China 3.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710049, Shaanxi, Peoples R China 4.Educ Univ Hong Kong, Dept Sci & Environm Studies, Hong Kong, Hong Kong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Haiwei,Huang, Tingting,Lu, Yanfeng,et al. Unraveling the mechanisms of room-temperature catalytic degradation of indoor formaldehyde and its biocompatibility on colloidal TiO2-supported MnOx-CeO2[J]. ENVIRONMENTAL SCIENCE-NANO,2018,5(5):1130-1139. |
| APA | Li, Haiwei.,Huang, Tingting.,Lu, Yanfeng.,Cui, Long.,Wang, Zhenyu.,...&Ho, Wingkei.(2018).Unraveling the mechanisms of room-temperature catalytic degradation of indoor formaldehyde and its biocompatibility on colloidal TiO2-supported MnOx-CeO2.ENVIRONMENTAL SCIENCE-NANO,5(5),1130-1139. |
| MLA | Li, Haiwei,et al."Unraveling the mechanisms of room-temperature catalytic degradation of indoor formaldehyde and its biocompatibility on colloidal TiO2-supported MnOx-CeO2".ENVIRONMENTAL SCIENCE-NANO 5.5(2018):1130-1139. |
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