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J Environ Manage. 2017 Jun 15;195(Pt 2):157-165. doi: 10.1016/j.jenvman.2016.06.056. Epub 2016 Jul 6.

Magnetic semiconductor photocatalysts for the degradation of recalcitrant chemicals from flow back water.

Author information

1
Department of Chemical Technology, Chemical Faculty, Gdansk University of Technology (GUT), Narutowicza 11/12, 80-233 Gdansk, Poland. Electronic address: annjurek@pg.gda.pl.
2
Department of Chemical Technology, Chemical Faculty, Gdansk University of Technology (GUT), Narutowicza 11/12, 80-233 Gdansk, Poland.
3
Department of Solid State Physics, Faculty of Applied Physics and Mathematics, (GUT), Poland.

Abstract

In the present study treatability of persistent organic compounds from the flow back water after hydrauling fracturing was investigated. The combination of TiO2 photocatalyst and magnetic oxide nanoparticles enhance the separation and recoverable property of nanosized TiO2 photocatalyst. Fe3O4/TiO2 and Fe3O4@SiO2/TiO2 nanocomposites were prepared by heteroagglomeration. The photocatalysts' characteristics by X-ray diffractometry (XRD), scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS) showed that sample with the mass ratio of Fe3O4 to TiO2 equal 1:4 and molar ratio of TEOS:Fe3O4 = 8:1 and NH4OH:TEOS = 16:1 obtained by deposition TiO2 P25 (Evonik) on magnetite core had about 124 m2 g-1 specific surface area and superparamagnetic properties. The prepared composites contained TiO2 and Fe3O4 crystal phases. The photocatalytic activity was estimated by measuring the decomposition rate of three model pollutants identified in the flow back water from one of the Baltic Shale Basin. Regarding flow back water treatment after shale gas exploration, the progress of photocatalytic degradation of organic compounds was measured by chemical oxygen demand (COD) concentration. The Fe3O4@SiO2/TiO2_P25 composite nanoparticles were recovered and re-used without significant reduction of efficiency.

KEYWORDS:

Fe(3)O(4)/TiO(2) nanocomposites; Flow back water; Heterogenous photocatalysis; Magnetic nanoparticles; Titanium (IV) oxide

PMID:
27394084
DOI:
10.1016/j.jenvman.2016.06.056
[Indexed for MEDLINE]

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