Visible light induced H2PO4− removal over CuAlO2 catalyst

Benreguia, N.; Omeiri, S.; Bellal, B.; Trari, M.

doi:10.1016/j.jhazmat.2011.06.049

Cited by 14 publications

(4 citation statements)

References 15 publications

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“…The increase in the photocurrent (J ph ) along the cathodic polarization is in conformity with p-type conduction which takes its origin from the oxygen insertion ( Fig. 9) [46]. The flat-band potential (V fb = 0.20 V) and the hole density (N A = 1.13 9 10 18 cm -3 ) are provided, respectively, from the intercept of the potential axis at C -2 = 0 and the slope of the Mott-Schottky characteristic (Fig.…”

Section: Photoelectrochemical Propertiessupporting

confidence: 52%

Sol–gel synthesis and characterization of the delafossite CuAlO2

Benreguia

Barnabé

Trari

2015

J Sol-Gel Sci Technol

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Nanocrystalline CuAlO 2 is synthesized by solgel method using ethylene glycol as solvent. The stages of formation are followed by thermal analysis. The X-ray diffraction pattern of the powder heat-treated at 1100°C shows a single phase, indexed in a rhombohedral symmetry (R 3 m). The apparent crystallite size (57 ± 8 nm) is determined from the Williamson-Hall plot. The direct optical transition (=3.69 eV), evaluated from the diffuse reflectance spectrum, is attributed to the charge transfer (O 2-: 2p ? Cu ? : 4s). The oxide is p-type semiconductor, and the conduction occurs predominantly by small polaron hopping between mixed valences Cu 2?/? , due to oxygen insertion in the layered crystal. The photoelectrochemical characterization gives a flat band of 0.20 V SCE and a hole density of 1.13 9 10 18 cm -3 . The semicircle centered on the real axis, in the electrochemical impedance spectroscopy (EIS), is due to the absence of constant phase element with a pure capacitive behavior. The straight line at 35°at low frequencies is attributed to the diffusion in the layered structure. Graphical Abstract Temperature dependence of the electrical conductivity for CuAlO 2 synthesized by sol-gel method. Inset: the variable range hopping at low temperatures. The sol-gel method has been successfully employed for the preparation of CuAlO 2 . The thermal variation of the conductivity indicates a semiconducting behavior which is frequency independent. At low temperature, a variable range hopping involves electrons jump over large distances according to the Mott law r ¼ r 0 exp T 0 T À Á 0:25 .

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Section: Photoelectrochemical Propertiessupporting

confidence: 52%

Sol–gel synthesis and characterization of the delafossite CuAlO2

Benreguia

Barnabé

Trari

2015

J Sol-Gel Sci Technol

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“…4a). This E g value was attributed to the indirectly allowed transition of CuAlO 2 (1.2-1.7 eV), 23,40,41 whereas the directly allowed transition usually leads to large E g values of 3-3.5 eV. 24,27 The indirect transition-induced photogeneration of charge carriers was conrmed by the IPCE proles (Fig.…”

Section: Use Of Cualo 2 For Photoelectrochemical H 2 Productionmentioning

confidence: 97%

Facilitating hole transfer on electrochemically synthesized p-type CuAlO₂ films for efficient solar hydrogen production from water

et al. 2017

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“…In this category, WS 2 is an attractive material for the solar energy conversion because it combines a narrow band gap, a chemical inertness over a fair pH range and occurs in n-as well in p-types [13]. In contrast to oxides that have a valence band (VB) deriving from O 2-: 2p parentage, WS 2 -VB is made up of less electronegative S: 3p orbital.…”

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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Visible light induced H2PO4− removal over CuAlO2 catalyst

Cited by 14 publications

References 15 publications

Sol–gel synthesis and characterization of the delafossite CuAlO2

Sol–gel synthesis and characterization of the delafossite CuAlO2

Facilitating hole transfer on electrochemically synthesized p-type CuAlO₂ films for efficient solar hydrogen production from water

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

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Visible light induced H2PO4− removal over CuAlO2 catalyst

Cited by 14 publications

References 15 publications

Sol–gel synthesis and characterization of the delafossite CuAlO2

Sol–gel synthesis and characterization of the delafossite CuAlO2

Facilitating hole transfer on electrochemically synthesized p-type CuAlO2 films for efficient solar hydrogen production from water

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

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Facilitating hole transfer on electrochemically synthesized p-type CuAlO₂ films for efficient solar hydrogen production from water