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Photocatalytic degradation of gaseous VOCs over Tm3+-TiO2: Revealing the activity enhancement mechanism and different reaction paths
Rao, ZP; Shi, GS; Wang, Z; Mahmood, A; Xie, XF; Sun, J
2020-09-01
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
SubtypeArticle
AbstractIn this work, we synthesized thulium (Tm3+) modified TiO2 nanoparticles by a facile sol-gel route. We show that Tm3+-modified TiO2 exhibit superior photocatalytic activity than pure TiO2 towards gas-phase degradation of acetaldehyde, o-xylene, and their mixture. The photocatalytic activity enhances with the increasing Tm content from 0.1 to 0.5 mol%. The 0.5 mol%Tm-TiO2 sample demonstrated the highest photodegradation efficiency (> 90.0%) for acetaldehyde and o-xylene. According to the systematic characterization such as photoluminescence (PL), photocurrent, up-conversion spectra, UV-Vis diffuse reflectance spectroscopy and electron spin resonance (ESR) analysis, the enhanced photocatalytic performance can be attributed to introducing the new Tm-4f states between the original band gap of TiO2, which led to the increase of efficiency of light-induced electron-hole separation and the increase of hydrophilicity which resulted in the increased adsorption capacity towards acetaldehyde and o-xylene. Gas Chromatography-Mass Spectrometer (GC-MS) analysis suggested that o-xylene was first oxidized to o-benzaldehyde, which was eventually converted to butanol before being mineralized into CO2. However, new intermediates including phthalide, o-methyl acetophenone, naphthalene and 5-Methyl-4-octanone were detected in the mixture.
DOI10.1016/j.cej.2020.125078
WOS KeywordTM-DOPED TIO2 ; UP-CONVERSION ; GAS-PHASE ; CATALYTIC-OXIDATION ; OPTICAL-PROPERTIES ; FACILE SYNTHESIS ; ANATASE TIO2 ; TOLUENE ; NANOPARTICLES ; NANOTUBES
Language英语
WOS Research AreaEngineering
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27804
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Rao, ZP,Shi, GS,Wang, Z,et al. Photocatalytic degradation of gaseous VOCs over Tm3+-TiO2: Revealing the activity enhancement mechanism and different reaction paths[J]. CHEMICAL ENGINEERING JOURNAL,2020.
APA Rao, ZP,Shi, GS,Wang, Z,Mahmood, A,Xie, XF,&Sun, J.(2020).Photocatalytic degradation of gaseous VOCs over Tm3+-TiO2: Revealing the activity enhancement mechanism and different reaction paths.CHEMICAL ENGINEERING JOURNAL.
MLA Rao, ZP,et al."Photocatalytic degradation of gaseous VOCs over Tm3+-TiO2: Revealing the activity enhancement mechanism and different reaction paths".CHEMICAL ENGINEERING JOURNAL (2020).
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