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Preparation and characterization of TiO2-Graphene@Fe3O4 magnetic composite and its application in the removal of trace amounts of microcystin-LR
Liang, Yulu1,2; He, Xiwen1,2; Chen, Langxing1,2; Zhang, Yukui1,2,3
Source PublicationRSC ADVANCES
2014
DOI10.1039/c4ra08258c
Volume4Issue:100Pages:56883-56891
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Multidisciplinary
WOS Research AreaChemistry
WOS KeywordVISIBLE-LIGHT IRRADIATION ; GRAPHENE OXIDE SHEETS ; PHOTOCATALYTIC DEGRADATION ; WATER-TREATMENT ; TITANIUM-DIOXIDE ; REACTION-PRODUCTS ; REACTION-KINETICS ; GRAPHITE OXIDE ; DRINKING-WATER ; RAMAN-SPECTRUM
AbstractMicrocystins (MCs), a family of potent cyclic heptapeptides, are produced by cyanobacteria blooms in eutrophic water and can cause acute and chronic toxicity and even mortality to animals and humans. Previous MC removal strategies concerned only highly contaminated water, in which the concentration of the pollutant was considerably larger than that in the natural world. Herein, we developed a ternary composite of TiO2-coated magnetic graphene and used it as an adsorbent and photocatalyst to efficiently remove microcystin-LR (MC-LR) from water. The two-dimensional sheets of graphene were decorated with a large quantity of spherical Fe3O4 nanoparticles (10-20 nm) and then coated with crystallized TiO2. These TiO2-graphene@ Fe3O4 composites exhibited a high magnetic response to the external magnetic field. And the huge surface of the graphene dramatically boosted the adsorbability and charge mobility, which lowered the recombination rate of electron-hole pairs, and hence systematically enhanced photocatalytic activity. The combination of adsorption and photodegradation endowed the composite with a better performance in the removal of trace amounts of MC-LR than the commercial photocatalyst, Degussa P25. The concentration of MC-LR can be lowered to less than 1 mu g L-1 (a provisional safety guideline by the World Health Organization) from 500 mu g L-1 under UV light in 30 min. The loading of TiO2-graphene@Fe3O4, the pH, and the UV energy were also optimized. Moreover, the stable removal capability of TiO2-graphene@Fe3O4 was confirmed over multiple cycles. Finally, the removal performance was also evaluated under natural light illumination in real surface water samples. This work paves the way for the development of more efficient and easily separable purifiers for the removal of pollutants and toxins from contaminated water.
Language英语
WOS IDWOS:000344998100036
Citation statistics
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/145770
Collection中国科学院大连化学物理研究所
Affiliation1.Nankai Univ, Coll Chem, Res Ctr Analyt Sci, State Key Lab Med Chem Biol, Tianjin 300071, Peoples R China
2.Collaborat Innovat Ctr Chem Sci & Engn, Tianjin 300071, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
Liang, Yulu,He, Xiwen,Chen, Langxing,et al. Preparation and characterization of TiO2-Graphene@Fe3O4 magnetic composite and its application in the removal of trace amounts of microcystin-LR[J]. RSC ADVANCES,2014,4(100):56883-56891.
APA Liang, Yulu,He, Xiwen,Chen, Langxing,&Zhang, Yukui.(2014).Preparation and characterization of TiO2-Graphene@Fe3O4 magnetic composite and its application in the removal of trace amounts of microcystin-LR.RSC ADVANCES,4(100),56883-56891.
MLA Liang, Yulu,et al."Preparation and characterization of TiO2-Graphene@Fe3O4 magnetic composite and its application in the removal of trace amounts of microcystin-LR".RSC ADVANCES 4.100(2014):56883-56891.
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