MoSe2/ZnO/ZnSe hybrids for efficient Cr(VI) reduction under visible light irradiation

Ren, Zhenxing; Liu, Xinjuan; Zhuge, Zhihao; Gong, Yinyan; Sun, Chang Q.

doi:10.1016/s1872-2067(19)63484-4

Cited by 89 publications

(31 citation statements)

References 63 publications

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“…Electrons on the CB of type- p Bi 2 S 3 and MoS 2 are transferred to CB of type- n Bi 2 WO 6 , which is finally used for Cr(VI) reduction, whereas the holes remain in the VB of Bi 2 S 3 (Equation (11)). Moreover, the CB edges of Bi 2 WO 6 , Bi 2 S 3 , and MoS 2 are more negative than the reduction potential of E (Cr(VI)/Cr(III)) (0.51 eV) [ 61 , 67 ]. Theoretically, the reduction of Cr(VI) to Cr(III) can be feasibly achieved by this route.…”

Section: Resultsmentioning

confidence: 99%

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Ren

Gong

et al. 2020

Nanomaterials

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Exploiting excellent photocatalytic activity and stable heterostructure composites are of critical importance for environmental sustainability. The spherical Bi2WO6/Bi2S3/MoS2 n-p heterojunction is first prepared via an in situ hydrothermal method using Bi2WO6, Na2MoO4·2H2O, and CH4N2S, in which the intermediate phase Bi2S3 is formed due to chemical coupling interaction of Bi2WO6 and CH4N2S. Scanning electron microscopy indicates that the compactness of the sample can be easily adjusted by changing the contents of S and Mo sources in the solution. The results of ultraviolet–visible (UV–vis) diffuse reflectance spectra, photoluminescence, transient photocurrent response, and electrochemical impedance spectra indicate that the formation of heterojunctions contributes to enhancing visible-light utilization and promoting photogenerated carrier separation and transfer. The composite material is used as a catalyst for the visible light photocatalytic reduction of Cr(VI). Remarkably, the optimal Bi2WO6/Bi2S3/MoS2 n-p heterojunction achieves the greatest Cr(VI) reduction rate of 100% within 75 min (λ > 420 nm, pH = 2); this rate is considerably better than the Cr(VI) reduction rate of pure Bi2WO6. The recycling experiment also reveals that the photocatalytic performance of the n-p heterojunction toward Cr(VI) is still maintained at 80% after three cycles, indicating that the n-p heterojunction has excellent structural stability. The capture experiment proves that the main active species in the system are electrons. The reasonable mechanism of Bi2WO6/Bi2S3/MoS2 photocatalytic reduction Cr(VI) is proposed. Our work provides new research ideas for the design of ternary heterojunction composites and new strategies for the development of photocatalysts for wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Ren

Gong

et al. 2020

Nanomaterials

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“…The point of charge zero (pzc) is measured from the equilibrium pH of an aqueous powder solution with a digital pH meter. The complex impedance spectroscopy (EIS) was undertaken with small amplitude wave signals in a wide region (10 -2 -10 5 Hz) [47][48][49][50][51].…”

Section: Scheme 1 Mechanism Of Pani-ndsa Doping Polymerizationmentioning

confidence: 99%

Preparation and Characterization of New Modified System: Polyaniline/1.5-Naphtalene Disulfonic Acid as Novel Photocatalyst in the H2 Production

Hamlaoui

Naar

Saib

et al. 2021

Preprint

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The semiconducting properties of the system Polyaniline / 1.5-naphtalene disulfonic acid are investigated for the first time to assess its photocatalytic performance for the hydrogen evolution under visible light irradiation. PANI is thermally stable up to ~ 300 °C, above which a weight loss of ~ 1.2% occurs. The X-ray diffraction pattern shows broad peaks with a particle size of ~ 7 nm, leading to an active surface area of ∼ 400 m2 g−1. A direct optical transition at 1.96 eV, is determined from the diffuse reflectance spectrum. The electrical conductivity of PANI-NDSA follows an exponential law with activation energy of 0.24 eV. The p-type conduction of PANI-NDSA is evidenced from the (capacitance-2 – potential) characteristic plot; a flat band potential (Efb) of 0.82 VSCE and a holes density (NA) of 8.43× 1024 m-3 are determined in neutral solution (Na2SO4 0.1 M). The electrochemical impedance spectroscopy, measured over an extended frequency domain (1 mHz - 1010 Hz), indicates the contribution of both the bulk and grain boundaries with a constant phase element (CPE). As application, PANI-NDSA is successfully tested for the hydrogen production upon visible light owing to the potential of its conduction band (-0.75 VSCE), less cathodic than that of H2O/H2 (~ -0.30 VSCE). H2 liberation rate of 3840 h-1 (g catalyst)-1 and a quantum efficiency of 0.34% under full light (29 mW cm-2) are obtained using Fe(CN)64- as reducing agent. The photoactivity is completely restored during the second cycle.

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“…Providing tremendous hope in solving the crisis of diminishing fossil fuels and deteriorating water quality, photocatalysis has drawn researchers' attention since the ability of TiO2 to split water was first reported in 1972 [1][2][3][4]. By generating charge carriers in semiconductors, photocatalysis represents the viability of converting light energy into chemical energy [5][6][7]. Nevertheless, the low utilization rate of the full solar spectrum still poses a challenge to the commercialization of photocatalysis [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Design of a ZnO/Poly(vinylidene fluoride) inverse opal film for photon localization-assisted full solar spectrum photocatalysis

Chen

Wang

Fang

et al. 2021

Chinese Journal of Catalysis

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MoSe2/ZnO/ZnSe hybrids for efficient Cr(VI) reduction under visible light irradiation

Cited by 89 publications

References 63 publications

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Preparation and Characterization of New Modified System: Polyaniline/1.5-Naphtalene Disulfonic Acid as Novel Photocatalyst in the H2 Production

Design of a ZnO/Poly(vinylidene fluoride) inverse opal film for photon localization-assisted full solar spectrum photocatalysis

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