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Magnetic semiconductor photocatalysts for the degradation of recalcitrant chemicals from flow back water
In the present study treatability of persistent organic compounds from the flow back water after hydrauling fracturing was investigated. The combination of TiO.sub.2 photocatalyst and magnetic oxide nanoparticles enhance the separation and recoverable property of nanosized TiO.sub.2 photocatalyst. Fe.sub.3O.sub.4/TiO.sub.2 and Fe.sub.3O.sub.4@SiO.sub.2/TiO.sub.2 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 Fe.sub.3O.sub.4 to TiO.sub.2 equal 1:4 and molar ratio of TEOS:Fe.sub.3O.sub.4 = 8:1 and NH.sub.4OH:TEOS = 16:1 obtained by deposition TiO.sub.2 P25 (Evonik) on magnetite core had about 124 m.sup.2 g.sup.-1 specific surface area and superparamagnetic properties. The prepared composites contained TiO.sub.2 and Fe.sub.3O.sub.4 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 Fe.sub.3O.sub.4@SiO.sub.2/TiO.sub.2_P25 composite nanoparticles were recovered and re-used without significant reduction of efficiency.
Magnetic semiconductor photocatalysts for the degradation of recalcitrant chemicals from flow back water
In the present study treatability of persistent organic compounds from the flow back water after hydrauling fracturing was investigated. The combination of TiO.sub.2 photocatalyst and magnetic oxide nanoparticles enhance the separation and recoverable property of nanosized TiO.sub.2 photocatalyst. Fe.sub.3O.sub.4/TiO.sub.2 and Fe.sub.3O.sub.4@SiO.sub.2/TiO.sub.2 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 Fe.sub.3O.sub.4 to TiO.sub.2 equal 1:4 and molar ratio of TEOS:Fe.sub.3O.sub.4 = 8:1 and NH.sub.4OH:TEOS = 16:1 obtained by deposition TiO.sub.2 P25 (Evonik) on magnetite core had about 124 m.sup.2 g.sup.-1 specific surface area and superparamagnetic properties. The prepared composites contained TiO.sub.2 and Fe.sub.3O.sub.4 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 Fe.sub.3O.sub.4@SiO.sub.2/TiO.sub.2_P25 composite nanoparticles were recovered and re-used without significant reduction of efficiency.
Magnetic semiconductor photocatalysts for the degradation of recalcitrant chemicals from flow back water
2016
Article (Journal)
English
BKL:
43.00
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