Enhanced photocatalytic degradation of VOCs using Ln3+-TiO2catalysts for indoor air purification

F. B. Li, X. Z. Li, C. H. Ao, Shuncheng Lee, M. F. Hou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

161 Citations (Scopus)

Abstract

Two types of lanthanide ion-doped titanium dioxide (Ln3+- TiO2) catalysts including La3+-TiO2and Nd3+-TiO2were prepared by a sol-gel method. The effects of the lanthanide ion doping on the crystal structure, surface area, adsorption properties, pore size distribution, and surface chemical state of the catalysts were investigated by means of XRD, BET, and XPS. As results, the crystal size decreased significantly, while the specific surface area, t-plot total surface area, micropore volume, and the total pore volume increased owing to the lanthanide ion doping. The nitrogen adsorption-desorption isotherms of the catalysts showed that the N2adsorption ability of the Ln3+-TiO2catalysts was better than the TiO2catalyst. Among them, the 0.7% Ln3+-TiO2catalysts demonstrated the highest adsorption ability. The photocatalytic activity of the catalysts was investigated in the experiments of the photocatalytic degradation of benzene, toluene, ethylbenzene and o-xylene (BTEX) in a gaseous phase. The photocatalytic efficiency of the TiO2catalysts with the lanthanide ion doping was remarkably enhanced by BTEX removal. The 1.2% Ln3+-TiO2catalysts achieved the highest photocatalytic activity. The enhanced photodegradation of BTEX is possibly due to the improved adsorption ability and the enhanced electron-hole pairs separation due to the presence of Ti3+on the surface of Ln3+-TiO2catalysts and the electron transfer between the conduction band/defect level and lanthanide crystal field state.
Original languageEnglish
Pages (from-to)787-800
Number of pages14
JournalChemosphere
Volume59
Issue number6
DOIs
Publication statusPublished - 1 Jan 2005

Keywords

  • BTEX
  • Indoor air purification
  • Lanthanide ion
  • Photocatalysis
  • TiO 2

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemistry(all)

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