Efficient reduction of Cr(VI) under visible light irradiation using CuS nanostructures

Nezar, Sawsen; Cherifi, Yacine; Barras, Alexandre; Addad, Ahmed; Dogheche, Elhadj; Saoula, Nadia; Laoufi, Nadia Aïcha; Roussel, Pascal; Szunerits, Sabine; Boukherroub, Rabah

doi:10.1016/j.arabjc.2018.01.002

Cited by 43 publications

(32 citation statements)

References 37 publications

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“…Powder XRD patterns of fresh CuS and used CuS nanoparticles after photocatalysis were compared ( Figure 1 ) to establish any changes in the crystalline phase of the as-prepared CuS nanoparticles. The CuS nanoparticles showed diffraction peaks at 2θ = 31.04°, 31.67°, 34.16°, 37.17°, 38.18°, 40.43°, 41.77°, 43.05°, 44.83°, 46.96°, 49.03°, 51.08°, 52.27°, 56.38°, 61.94° and 70.19° which corresponds to (100), (101), (102), (103), (006), (105), (106), (107), (008), (105), (110), (108), (201), (202), (116) and (208) plane of hexagonal covellite CuS phase (JCPDS No: 01-078-0876) [ 36 , 37 ]. The diffraction peaks show no apparent deviations; after the CuS nanoparticles have been used as photocatalysts to degrade the organic dyes.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Degradation of Ternary Dyes by Copper Sulfide Nanoparticles

Ajibade

Oluwalana

2021

Nanomaterials

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We report the effect of thermolysis time on the morphological and optical properties of CuS nanoparticles prepared from Cu(II) dithiocarbamate single-source precursor. The as-prepared copper sulfide nanoparticles were used as photocatalysts for the degradation of crystal violet (CV), methylene blue (MB), rhodamine B (RhB), and a ternary mixture of the three dyes (CV/MB/RhB). Powder XRD patterns confirmed the hexagonal covellite phase for the CuS nanoparticles. At the same time, HRTEM images revealed mixed shapes with a particle size of 31.47 nm for CuS1 prepared at 30 min while CuS2 prepared at 1 h consists of mixtures of hexagonal and nanorods shaped particles with an average size of 21.59 nm. Mixed hexagonal and spherically shaped particles with a size of 17.77 nm were obtained for CuS3 prepared at 2 h. The optical bandgaps of the nanoparticles are 3.00 eV for CuS1, 3.26 eV for CuS2 and 3.13 eV for CuS3. The photocatalytic degradation efficiency showed that CuS3 with the smallest particle size is the most efficient photocatalyst and degraded 85% of CV, 100% of MB, and 81% of RhB. The as-prepared CuS showed good stability and recyclability and also degraded ternary dyes mixture (CV/MB/RhB) effectively. The byproducts of the dye degradation were evaluated using ESI-mass spectrometry.

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Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Degradation of Ternary Dyes by Copper Sulfide Nanoparticles

Ajibade

Oluwalana

2021

Nanomaterials

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“…Photocatalysts are nowadays increasingly used to treat environmental problems, in particular excessive discharges of industrial waste water. Industrial wastewater is often loaded with traces of toxic metal ions (e.g., Cr(VI), Cd(II), As(V)), Hg(II)) as well as with harmful organic pollutants (e.g., organic dyes, polychlorinated biphenyls, phenol ) at the same time [1][2][3]. Among the metal ions, hexavalent chromium, Cr(VI), is a highly toxic and nonbiodegradable pollutant, which can cause different health problems such as cancer pulmonary congestions, and liver damage.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous photocatalytic Cr(VI) reduction and phenol degradation over copper sulphide-reduced graphene oxide nanocomposite under visible light irradiation: Performance and reaction mechanism

et al. 2021

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Cu x S (x=1‐2), a well‐known p‐type semiconductor material, has emerged as a new class of photocatalyst attributing to its simplicity of synthesis, a wide range compositions, low cost, low toxicity and high stability . The narrow band gap (1.2‐2.2 eV) of Cu x S depends on its crystalline phase, which permits to efficiently harvest photons in the visible light absorption window and thus makes it has outstanding light adsorption properties and excellent photocatalytic performance . At present, the unique morphologies and various compositions of Cu x S have been synthesized, including Cu 1.75 S nanoparticles, Cu 2 S nanowires, Cu x S nanorods, CuS nanosheets, CuS nanoflowers .…”

Section: Introductionmentioning

confidence: 99%

One‐Step Transformation from Cu₂S Nanocrystal to CuS Nanocrystal with Photocatalytic Properties

et al. 2019

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Herein, we have realized the transformation from Cu 2 S to CuS phase by a facile secondary vulcanization. The CuS completely inherited the special morphology of the precursor nanocrystal, and the feature excludes the structural and dimensional influence in the study of the effects of Cu(I) and Cu(II) on photocatalytic properties. Under visible light irradiation, the photocatalytic performances of Cu 2 S@CT (CT, biomass carbon tube) and CuS@CT composites were examined on organic dye (methylene blue, MB) degradation and Cr (VI) reduction at different original solution pH. Both photocatalysts exhibit good photocatalytic activity under favourable conditions, which should be attributed to the high specific surface area and luxuriant active sites of the materials with special nanostructures. Moreover, the Cu 2 S@CT and CuS@CT show distinctdifferent oxidability and reducibility due to the compositional difference, Cu 2 S@CT composites have better reduction properties of Cr(VI) at pH = 2, while the CuS@CT composites exhibit better degradation activity of MB at pH = 10.

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Efficient reduction of Cr(VI) under visible light irradiation using CuS nanostructures

Cited by 43 publications

References 37 publications

Enhanced Photocatalytic Degradation of Ternary Dyes by Copper Sulfide Nanoparticles

Enhanced Photocatalytic Degradation of Ternary Dyes by Copper Sulfide Nanoparticles

Simultaneous photocatalytic Cr(VI) reduction and phenol degradation over copper sulphide-reduced graphene oxide nanocomposite under visible light irradiation: Performance and reaction mechanism

One‐Step Transformation from Cu₂S Nanocrystal to CuS Nanocrystal with Photocatalytic Properties

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Efficient reduction of Cr(VI) under visible light irradiation using CuS nanostructures

Cited by 43 publications

References 37 publications

Enhanced Photocatalytic Degradation of Ternary Dyes by Copper Sulfide Nanoparticles

Enhanced Photocatalytic Degradation of Ternary Dyes by Copper Sulfide Nanoparticles

Simultaneous photocatalytic Cr(VI) reduction and phenol degradation over copper sulphide-reduced graphene oxide nanocomposite under visible light irradiation: Performance and reaction mechanism

One‐Step Transformation from Cu2S Nanocrystal to CuS Nanocrystal with Photocatalytic Properties

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One‐Step Transformation from Cu₂S Nanocrystal to CuS Nanocrystal with Photocatalytic Properties