期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 170, 期 -, 页码 74-82出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2015.01.013
关键词
Photocatalysis; Microcystin-LA; Graphene oxide; Carbon nanotubes; TiO2
资金
- FCT (Fundacao para a Ciencia e a Tecnologia) and FEDER (ERDF - European Regional Development Fund) through Programme COMPETE [PTDC/AAC-AMB/122312/2010, FCOMP-01-0124-FEDER-019503]
- FCT [PEst-C/EQB/LA0020/2013]
- QREN [NORTE-070162-FEDER-000050, NORTE-07-0124-FEDER-000015, NORTE-07-0202-FEDER-038900]
- FCT Investigator Programme with financing from the European Social Fund and the Human Potential Operational Programme [SFRH/BD/79878/2011, SFRH/BPD/74239/2010, SFRH/BPD/88964/2012, IF/01501/2013]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/88964/2012, SFRH/BD/79878/2011, PTDC/AAC-AMB/122312/2010, SFRH/BPD/74239/2010] Funding Source: FCT
The photocatalytic degradation of a cyanobacterial toxin, microcystin-LA (MC-LA), was studied in aqueous solutions under both simulated solar light and visible light irradiation. Neat TiO2 and carbon-based TiO2 materials, prepared with carbon nanotubes (CNT) or graphene oxide (GO), were compared. The highest photocatalytic activity was obtained with a GO-TiO2 composite comprising 4 wt.% of carbon content (GO-TiO2-4). Complete conversion of MC-LA was achieved under solar light irradiation in 5 min. GO-TiO2-4 was also active under visible light illumination, with 88% of MC-LA removal in 2 h.The high photocatalytic activity of GO-TiO2-4 was attributed to the optimal assembly and interfacial coupling between the TiO2 nanoparticles and the GO sheets that can effectively inhibit electron/hole recombination. Reaction intermediates of MC-LA photocatalytic degradation were also identified by LC/Q-TOF and LC/MS/MS, most of them resulting from the attack of hydroxyl radicals to the MC-LA molecule under solar light irradiation. (C) 2015 Elsevier B.V. All rights reserved.
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