Influence of light flux and hydrodynamic flow regime on the photoreduction of Cr(VI) on the CuAl2O4/TiO2 hetero-junction

Gherbi, R.; Trari, M.; Nasrallah, Noureddine

doi:10.1016/j.jece.2013.09.020

Cited by 8 publications

(4 citation statements)

References 48 publications

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“…Semiconductor photocatalytic reduction technology has attracted a lot of attention in recent years (Miseki et al 2008 ; Kato and Kudo 2002 ; Wang et al 2009 ; Mu et al 2011 ; Nakhjavan et al 2012 ; Duo et al 2015 ; Zhang et al 2009 ). Semiconductor photocatalytic technology has a promising prospect for wastewater Cr(VI) removing because it is efficiency and inexpensive to maintain and operate without secondary pollution (Hu et al 2014 ; Meichtry et al 2014 ; Gherbi et al 2013 ; Alanis et al 2013 ). Strontium titanate (SrTiO 3 ) could be applied in Cr(VI) ion contaminant reduction with excellent photocatalyst performance, but it is only effective under ultraviolet irradiation which is about 4 % of the sunlight (Zheng et al 2011 ).…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal derived nitrogen doped SrTiO3 for efficient visible light driven photocatalytic reduction of chromium(VI)

et al. 2016

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In this work, we report on the synthesis of nitrogen doped SrTiO3 nanoparticles with efficient visible light driven photocatalytic activity toward Cr(VI) by the solvothermal method. The samples are carefully characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV–Vis diffuse reflectance spectroscopy and photocatalytic test. It is found that nitrogen doping in SrTiO3 lattice led to an apparent lattice expansion, particle size reduction as well as subsequent increase of Brunner–Emmet–Teller surface area. The visible light absorption edge and intensity can be modulated by nitrogen doping content, which absorption edge extends to about 600 nm. Moreover, nitrogen doping can not only modulate the visible light absorption feature, but also have consequence on the enhancement of charge separation efficiency, which can promote the photocatalytic activity. With well controlled particle size, Brunner–Emmet–Teller surface area, and electronic structure via nitrogen doping, the photocatalytic performance toward Cr(VI) reduction of nitrogen doped SrTiO3 was optimized at initial hexamethylenetetramine content of 2.Electronic supplementary materialThe online version of this article (doi:10.1186/s40064-016-2804-2) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal derived nitrogen doped SrTiO3 for efficient visible light driven photocatalytic reduction of chromium(VI)

et al. 2016

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“…However, TiO 2 based solar devices are efficient at short wavelengths (\400 nm) where only 5 % of the solar spectrum accounts for the UV radiation. Many efforts have been focused on heterosystems which could not only extend the spectral response of wide band gap semiconductors (SCs) toward lower energies but also inhibit the charge recombination and in this way increase the photocatalytic performance [10]. TiO 2 can mediate the electron transfer and plays a crucial role when the potential of its conduction band (CB) is less cathodic than that of the photosensitizer [11].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of orange II on the novel hetero-system WS2/TiO2 under UV light

Bassaid

Bellal

Trari

2015

Reac Kinet Mech Cat

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The photodegradation of orange II (OII) is successfully achieved on the new hetero-system WS 2 /TiO 2 under UV illumination. The nano sized bi-functional catalyst is prepared by sol gel and calcined at *450°C. The X-ray diffraction shows noticeably broad peaks and TiO 2 is therefore less crystallized with the anatase phase. The sensitizer WS 2 presents a direct optical transition at 1.72 eV. The Mott-Schottky plot (C -2 -V) is characteristic of n type conduction from which a flat band potential of 0.17 V SCE and a donor density of 5.30 9 10 17 cm -3 are determined. An energy band diagram is established, predicting an electron transfer from WS 2 to TiO 2 ; the injection process is confirmed by the photocurrent measurements at different concentrations. Upon increasing the mass of WS 2 , the activity increases and the best performance occurs on 30 % WS 2 /TiO 2 . A conversion of 98 % is reported in aerated solution for OII concentration of 10 ppm in less than 90 min. The oxidation follows a first order kinetic with a rate constant of 4.8 9 10 -2 min -1 .

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“…These methods include the application of Cr(VI) reduction via the use of chemical reductants as well as photocatalytic routes. Both the methodologies have advantages and disadvantages in the reduction process . Moreover, our reported bimetallic CuPd alloy NPs showed intriguing catalytic activity in both reduction reactions e. g. reduction of 4‐NP and toxic Cr(VI) compared to the monometallic counterparts .…”

Section: Cu−m (M=pd Ag Pt Au) Nanoparticle Catalystsmentioning

confidence: 90%

Cu‐Based Nanoparticles as Emerging Environmental Catalysts

Deka

Borah

Saikia

et al. 2018

The Chemical Record

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This account provides an overview of current research activities on nanoparticles containing the earth-abundant and inexpensive element copper (Cu) and Cu-based nanoparticles, especially in the field of environmental catalysis. The different synthetic strategies with possible modification of the chemical/ physical properties of these nanoparticles using such strategies and/or conditions to improve catalytic activity are presented. The design and development of support and/or bimetallic systems (e. g., alloys, intermetallic, etc.) are also included. Herein, we report synthetic approaches of Cu and Cu-based nanoparticles (monometallic copper, bimetallic copper and copper (II) oxide nanoparticles/nanostructures) and impregnation of such nanoparticles onto support material (e. g., Co O nanostructure), along with their applications as environmental catalyst for various oxidation and reduction reactions. Finally, this account provides necessary advances and perspectives of Cu-based nanoparticles in the environmental catalysis.

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Influence of light flux and hydrodynamic flow regime on the photoreduction of Cr(VI) on the CuAl2O4/TiO2 hetero-junction

Cited by 8 publications

References 48 publications

Hydrothermal derived nitrogen doped SrTiO3 for efficient visible light driven photocatalytic reduction of chromium(VI)

Hydrothermal derived nitrogen doped SrTiO3 for efficient visible light driven photocatalytic reduction of chromium(VI)

Photocatalytic degradation of orange II on the novel hetero-system WS2/TiO2 under UV light

Cu‐Based Nanoparticles as Emerging Environmental Catalysts

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