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Surface adsorption configurations of H3PO4 modified TiO2 and its influence on the photodegradation intermediates of gaseous o-xylene
Wang, Z; Mahmood, A; Xie, XF; Wang, X; Qiu, HX; Sun, J
2020-08-01
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
SubtypeArticle
AbstractFor the oxide-based photocatalysts, polyoxylic acid modification can affect their adsorption/desorption properties and further regulate photocatalytic reaction pathway, which is crucial for enhancing photocatalytic activity and selectivity. Herein, phosphoric acid modified TiO2 was synthesized by a facile impregnation-calcination method for photocatalytic degradation of gaseous o-xylene. According to FTIR, XPS, and EDS analysis, phosphoric acid was anchored on the surface of TiO2 successfully. The surface P atomic percentages for PT1 was 2.45%. The as-prepared phosphoric acid modified TiO2 (PTx) had a photocatalytic performance superior to that of commercial TiO2 and unmodified TiO2 (PT0), with increasing by 2.2 times at most. Interestingly, the phosphoric acid molecules strongly adsorbed on anatase TiO2 surface by forming H-O-2C and =O-Ti-5C chemical bonds according to the first principle calculations, which changed TiO2 surface properties (specific surface area and surface negative electrostatic field) and further improved adsorption and charge carrier separation and transfer, thus improving the photocatalytic activity. Additionally, according to the intermediates results, the relative abundance of intermediates shows obvious difference. Acetone was detected as the most abundant intermediates during o-xylene degradation for PT0, whereas that was o-methyl benzaldehyde for PT1, which could be ascribed to the difference of surface adsorption configuration of o-xylene. According to the temperature-programmed desorption (TPD) results, the surface modified by phosphoric acid could change the o-xylene adsorption configuration to favor its methyl oxidation (standing configuration), whereas the unmodified surface could be more favorable to the benzene ring-open reaction (lying configuration). This work will deepen the understanding of the relevance of surface modification and surface photocatalytic reaction, which also provides a feasible strategy to improve photocatalytic selectivity.
DOI10.1016/j.cej.2020.124723
WOS KeywordVOLATILE ORGANIC-COMPOUNDS ; ENHANCED PHOTOCATALYTIC ACTIVITY ; VISIBLE-LIGHT PHOTOCATALYSIS ; TOTAL-ENERGY CALCULATIONS ; TITANIUM-DIOXIDE ; CATALYTIC COMBUSTION ; INDOOR AIR ; OXIDATION ; PHOSPHATE ; REMOVAL
Language英语
WOS Research AreaEngineering
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27865
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Wang, Z,Mahmood, A,Xie, XF,et al. Surface adsorption configurations of H3PO4 modified TiO2 and its influence on the photodegradation intermediates of gaseous o-xylene[J]. CHEMICAL ENGINEERING JOURNAL,2020.
APA Wang, Z,Mahmood, A,Xie, XF,Wang, X,Qiu, HX,&Sun, J.(2020).Surface adsorption configurations of H3PO4 modified TiO2 and its influence on the photodegradation intermediates of gaseous o-xylene.CHEMICAL ENGINEERING JOURNAL.
MLA Wang, Z,et al."Surface adsorption configurations of H3PO4 modified TiO2 and its influence on the photodegradation intermediates of gaseous o-xylene".CHEMICAL ENGINEERING JOURNAL (2020).
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