Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 82, Issue 1, Pages 289-298Publisher
SPRINGER
DOI: 10.1007/s10971-016-4276-9
Keywords
Ag/Ce4+/La3+ co-modified TiO2; Photocatalysis; Basalt fiber; Ammonia nitrogen
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Funding
- Program for the Science and Technology Plans of Tianjin [15PTSYJC00240, 16JCTPJC53280]
- Changjiang Scholars and Innovative Research Team (PCSIRT) in University of Ministry of Education [IRT13084]
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Ag/Ce4+/La3+ (1, 3, and 5 wt.%) co-modified titanium dioxide powder and modified Titanium dioxide coated basalt fiber photocatalysts were prepared via sol-gel method. The properties of the photocatalysts were characterized in detail by using transmission electron microscopy, field-emission scanning electron microscopy, UV-visible absorption spectra, X-ray powder diffraction, X-ray photoelectron spectroscopy. The results showed that the crystal of titanium dioxide photocatalyst transformed from anatase/rutile mixture phase to pure anatase phase, and the anatase crystallites size decreased after co-modifying by Ag/Ce4+/La3+. In comparison, Ag/Ce4+/La3+ co-modified titanium dioxide exhibited higher degradation efficiency than that of Ce4+/La3+ modified titanium dioxide and Ag modified titanium dioxide due to the synergistic effect of Ce4+/La3+ and Ag-0. Moreover, 3% Ag/Ce4+/La3+-TiO2 coated basalt fiber photocatalyst represented the best activity in the degradation of ammonia nitrogen wastewater. After 6 h degradation reaction, the concentration of ammonia nitrogen decreased from 60.4 mg/L to 2.8 mg/L, and the degradation rate of ammonia nitrogen reached 95.3%, about 74% of total nitrogen was removed during the process, whereas were 93.9 and 70.7% in case of 3% Ag/Ce4+/La3+-TiO2 powder, respectively. [GRAPHICS] .
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