Photocatalytic reduction of Cr(VI) on the new hetero-system CuAl2O4/TiO2

Gherbi, R.; Nasrallah, Noureddine; Amrane, Abdeltif; Maachi, Rachida; Trari, M.

doi:10.1016/j.jhazmat.2010.11.105

Cited by 83 publications

(27 citation statements)

References 28 publications

(32 reference statements)

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“…10b). However, the tendency to saturation over illumination time is ascribed to the competitive water reduction as observed in our previous work (Gherbi et al 2011). …”

Section: Photocatalysissupporting

confidence: 63%

“…Environment protection has become a field of high priority because of the large scale aquatic pollution (Karunakaran et al 2009;Gherbi et al 2011). Unlike organic molecules, heavy metals are non-biodegradable and various methods exist for their removal, including reverse osmosis, ion exchange, electrochemical-reduction and electro-dialysis (Paul et al 2012).…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of nano structured Ba2SnO4 as a novel photocatalyst material for the chromate reduction

et al. 2013

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The photo-electrochemical properties of the layered perovskite Ba 2 SnO 4 , prepared by nitrate route are reported for the first time. The oxide exhibits a direct optical transition at 2.98 eV, attributed to the charge transfer O 2-: 2p ? Sn 4? : 5s and possesses a chemical stability over the whole pH range. The Mott Schottky plot in acidic medium is characteristic of n type conductivity with a flat band potential E fb of -0.84 V SCE and an electron density N D of 1.14 9 10 17 cm -3 . The electrochemical impedance spectroscopy reveals the bulk and grain boundaries contributions. Ba 2 SnO 4 is of interest for the environmental protection. At pH 2.5, its conduction band (CB, -0.86 V SCE ) is below the HCrO 4 -level, yielding a spontaneous reduction to Cr 3? under UV light. The reduction is optimized with respect to the Cr(VI) concentration. The photo reduction follows a pseudo-first-order kinetic and the data fit well the Langmuir-Hinshelwood (L-H) model with an apparent rate constant of 0.18 h -1 for an initial concentration of 50 ppm. The chromate reduction under solar light is studied under optimized conditions. In presence of oxalic acid, 73 % of initial concentration disappears after *2 h of irradiation.

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“…10b). However, the tendency to saturation over illumination time is ascribed to the competitive water reduction as observed in our previous work (Gherbi et al 2011). …”

Section: Photocatalysissupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of nano structured Ba2SnO4 as a novel photocatalyst material for the chromate reduction

et al. 2013

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“…Gherbi et al reported the visible-light-driven photoreduction of Cr(VI) over CuAl 2 O 4 /TiO 2 [181] with 95% reduction after 3 h irradiation at pH 2. The photoreduction follows first order kinetics with a half-life of ≈1 h and a quantum yield of 0.11%.…”

Section: Reviewmentioning

confidence: 99%

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Acharya

Naik

Parida

2018

Beilstein J. Nanotechnol.

103

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Cr(VI) exhibits cytotoxic, mutagenic and carcinogenic properties; hence, effluents containing Cr(VI) from various industrial processes pose threat to aquatic life and downstream users. Various treatment techniques, such as chemical reduction, ion exchange, bacterial degradation, adsorption and photocatalysis, have been exploited for remediation of Cr(VI) from wastewater. Among these, photocatalysis has recently gained considerable attention. The applications of photocatalysis, such as water splitting, CO2 reduction, pollutant degradation, organic transformation reactions, N2 fixation, etc., towards solving the energy crisis and environmental issues are briefly discussed in the Introduction of this review. The advantages of TiO2 as a photocatalyst and the importance of its modification for photocatalytic reduction of Cr(VI) has also been addressed. In this review, the photocatalytic activity of TiO2 after modification with carbon-based advanced materials, metal oxides, metal sulfides and noble metals towards reduction of Cr(VI) was evaluated and compared with that of bare TiO2. The photoactivity of dye-sensitized TiO2 for reduction of Cr(VI) was also discussed. The mechanism for enhanced photocatalytic activity was highlighted and attributed to the resultant properties, namely, effective separation of photoinduced charge carriers, extension of the light absorption range and intensity, increase of the surface active sites, and higher photostability. Advantages and limitations for photoreduction of Cr(VI) over modified TiO2 are depicted in the Conclusion. The various challenges that restrict the technology from practical applications in remediation of Cr(VI) from wastewater were addressed in the Conclusion section as well. The future perspectives of the field presented in this review are focused on the development of whole-solar-spectrum responsive, TiO2-coupled photocatalysts which provide efficient photocatalytic reduction of Cr(VI) along with their good recoverability and recyclability.

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“…Many approaches have been adopted to solve the issues [4][5][6]. In recent years, it has been found that the heterostructure combining TiO 2 with semiconductors could effectively reduce the recombination rate of photogenerated charges in TiO 2 [7][8][9]. Several TiO 2 -based heterojunctions have been reported, such as WO 3 /TiO 2 [10], Cu 2 O/TiO 2 [11] and CeO 2 /TiO 2 [12], etc.…”

Section: Introductionmentioning

confidence: 99%

Heterojunction of SrTiO3/TiO2 nanotubes with dominant (001) facets: Synthesis, formation mechanism and photoelectrochemical properties

Zhou

Yin

et al. 2015

Materials Science in Semiconductor Processing

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Photocatalytic reduction of Cr(VI) on the new hetero-system CuAl2O4/TiO2

Cited by 83 publications

References 28 publications

Preparation and characterization of nano structured Ba2SnO4 as a novel photocatalyst material for the chromate reduction

Preparation and characterization of nano structured Ba2SnO4 as a novel photocatalyst material for the chromate reduction

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Heterojunction of SrTiO3/TiO2 nanotubes with dominant (001) facets: Synthesis, formation mechanism and photoelectrochemical properties

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Photocatalytic reduction of Cr(VI) on the new hetero-system CuAl2O4/TiO2

Cited by 83 publications

References 28 publications

Preparation and characterization of nano structured Ba2SnO4 as a novel photocatalyst material for the chromate reduction

Preparation and characterization of nano structured Ba2SnO4 as a novel photocatalyst material for the chromate reduction

Cr(VI) remediation from aqueous environment through modified-TiO2-mediated photocatalytic reduction

Heterojunction of SrTiO3/TiO2 nanotubes with dominant (001) facets: Synthesis, formation mechanism and photoelectrochemical properties

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Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction