期刊
APPLIED SURFACE SCIENCE
卷 467, 期 -, 页码 1076-1087出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.10.175
关键词
Au-TiO2 (TiO2(B)/anatase) nanobelts; Hydrothermal; Sol-gel process; Heterogeneous photocatalysis
类别
资金
- Spanish Ministry of Economy and Competitiveness [CTQ2015-64664-C2-1-P]
- Canary Islands Agency for Research, Innovation and the Information Society (ACIISI) of the Canary Islands Government through the FANOX Project [PROID2017010034]
- Spanish Ministry of Science and Innovation [UNLP10-3E-726]
- ERDF funds
- UNetBA Erasmus Program
In this work, novel TiO2-based nanobelts with various phases were synthesized: biphasic TiO2(B)/anatase, pure TiO2(B) and pure anatase. These catalysts were obtained via hydrothermal reaction using two nanoparticulated TiO2 photocatalysts as precursors: Aeroxide TiO2 P25 (P25) and TiO2 synthesized via a sol-gel process (SG). In addition, the surface of the photocatalysts was modified with gold using a photodeposition method. A characterization study of the different photocatalysts was performed with X-ray diffraction analysis (XRD), UV-Vis diffuse reflectance spectra (DRS), scanning electron microscopy (SEM), X-ray photoelectron spectrum analysis (XPS) and Brunauer-Emmett-Teller measurements (BET). The photocatalytic reaction of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) was investigated under UVA irradiation. A toxicity analysis was performed with the marine bioluminescent bacteria Vibrio fischeri. The highest 2,4-D removal efficiency of 99.2% was obtained with the biphasic Au-TiOP2 (TiO2(B)/anatase) nanobelts with anatase as predominant phase. Toxicity was mainly due to the intermediate 2,4-dichlorophenol (2,4-DCP) which was eliminated in 4 h. The TiO2 nanobelt phase structure is shown to have a significant effect on photocatalytic activity.
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