Enhanced photocatalytic performance of Ag@TiO2 for the gaseous acetaldehyde photodegradation under fluorescent lamp

Qinglong Zeng, Xiaofeng Xie, Xiao Wang, Yan Wang, Guanhong Lu, David Y.H. Pui, Jing Sun

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The ever increasing problem of air pollution has provoked the research and development of highly-efficient photocatalysts. Herein, Ag nanowires@TiO2 composite photocatalyst with improved photocatalytic performance was fabricated by a facile one-step solvothermal procedure. The formation of one-dimensional Ag nanowires@TiO2 core-shell nanostructures could not only broaden the light-absorbing range of TiO2 catalysts through the surface plasmon resonance effect of Ag nanowires, but also enable the effective separation of photoinduced electron-hole pairs. Under the irradiation of a 260 W fluorescent lamp, the composite with 0.5 wt% Ag nanowires exhibited the highest photocatalytic activity in short contact time (4.8 min), and the corresponding gaseous acetaldehyde removal ratio was 72%, which was much higher than that of bare TiO2 (37%). The photocatalyst also showed ultrastable activity in the 15 weeks usage, which ensured their practical applications in the air purification field. An in-depth mechanism of the photodecomposition of acetaldehyde was proposed on the basis of the electron spin resonance (ESR) tests and the scavenger experiments. [rad]O2 reactive radicals was found to play a predominant role in the oxidation and decomposition of acetaldehyde. The outstanding performance of the composite materials and the thoroughly understanding of the reaction mechanism would cast light on the purposively design and optimization of TiO2-based catalysts.

Original languageEnglish (US)
Pages (from-to)83-92
Number of pages10
JournalChemical Engineering Journal
Volume341
DOIs
StatePublished - Jun 1 2018

Bibliographical note

Funding Information:
This work was financially supported by the National Key Research and Development Program of China ( 2016YFA0203000 ), the Key Project of International Cooperation of the Chinese Academy of Sciences ( GJHZ1656 ), and the National Natural Science Foundation of China (No. 51702347 ).

Funding Information:
This work was financially supported by the National Key Research and Development Program of China (2016YFA0203000), the Key Project of International Cooperation of the Chinese Academy of Sciences (GJHZ1656), and the National Natural Science Foundation of China (No. 51702347).

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

  • Ag@TiO core-shell heterostructure
  • Gaseous photocatalysis
  • Photocatalytic mechanism
  • Reactive radicals
  • Surface plasmon resonance

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