Photocatalytic reduction of Cr(VI) by iron tungstosilicate under visible light

Cen, Qing; Gao, Qiaoyuan; Zhang, Chenlu; Liu, Yingqi; Wang, Qi

doi:10.1016/j.jcis.2019.11.098

Cited by 16 publications

(8 citation statements)

References 36 publications

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“…The synthesis of hybrids 3 and 4 has already been reported by us using a mechanochemical approach for their post-synthetic modification studies. 26 The successful synthesis of hybrids 1−4 was confirmed by 1 H and 19 F NMR spectroscopy. The 1 H NMR spectra of hybrids 1−4 showed chemical shifts corresponding to the different protons of the ASC moieties.…”

Section: ■ Introductionmentioning

confidence: 90%

“…Similarly, a singlet observed at around 3.31 ppm corresponding to six protons is due to the two methyl groups of the sulfonium unit (see Figures S1−S4a). The 19 F NMR spectrum of the ASC precursor FPDST showed a characteristic singlet peak due to the triflate moiety at −77.67 ppm. This peak was absent in the 19 28 The bands related to ν as (P−O), ν as (W�O), ν as (W−O−W), and ν as (W−O−W) for hybrid 2 appeared at 1076, 973, 889, and 784 cm −1 respectively.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The 19 F NMR spectrum of the ASC precursor FPDST showed a characteristic singlet peak due to the triflate moiety at −77.67 ppm. This peak was absent in the 19 28 The bands related to ν as (P−O), ν as (W�O), ν as (W−O−W), and ν as (W−O−W) for hybrid 2 appeared at 1076, 973, 889, and 784 cm −1 respectively. 29 The FT-IR data of hybrids 3 and 4 have already been reported.…”

Section: ■ Introductionmentioning

confidence: 99%

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Keggin Cluster Modulated Photocatalytic Activity of Aryl Sulfonium Polyoxometalate Hybrids toward Dichromate Reduction

2022

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Dichromate (Cr2O7 2–) ion having chromium in its +6 oxidation state is a carcinogen and a potential threat to humans and aquatic life. The photocatalytic reduction of toxic Cr(VI) species into less toxic Cr(III) is an important target in heterogeneous catalysis. In this work, the catalytic activities of a series of Keggin cluster-based aryl sulfonium polyoxometalate hybrids, (FPDS)3[PMo12O40] (1), (FPDS)3[PW12O40] (2), (FPDS)4[SiMo12O40] (3), and (FPDS)4[SiW12O40] (4), toward the photocatalytic reduction of Cr(VI) have been analyzed and compared. Here, we used the aryl sulfonium counterions to modulate the POM cluster’s solubility in water and stabilize the photogenerated e––h+ pair on the cluster. All of the hybrids 1–4 catalyzed the reduction of Cr(VI) to Cr(III) under ultraviolet (UV) irradiation, and their photocatalytic efficiencies followed the order hybrid 1 > hybrid 3 > hybrid 2 > hybrid 4, with the rate-constant values of 0.048, 0.0056, 0.0035, and 0.0028 min–1, respectively. Hybrid 1 with [PMo12O40]3– Keggin cluster exhibited the best photocatalytic activity in the series yielding a 99% reduction in 120 min. The reasons behind the best photocatalytic activity of hybrid 1 are identified as its low band gap, less charge recombination, and fast photoresponse. The electron-trapping analyses performed using AgNO3 revealed electrons as the main reactive species responsible for the photocatalytic reduction of Cr(VI). A plausible photocatalytic mechanism has also been proposed based on electron-trapping experiments. The present study shows that aryl sulfonium Keggin hybrids can function as efficient photocatalysts for Cr(VI) reduction, and their catalytic efficiency varies with the nature of the Keggin cluster.

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Section: ■ Introductionmentioning

confidence: 90%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Keggin Cluster Modulated Photocatalytic Activity of Aryl Sulfonium Polyoxometalate Hybrids toward Dichromate Reduction

2022

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“…Photocatalytic Cr(VI) reduction is a promising method due to the green procedure and low energy consumption. [19][20][21] Titanium dioxide (TiO 2 ) is a promising photocatalyst because of its abundance, low cost, excellent stability, and environmental benignity. 22,23 Although films (even in an array form) show lower photocatalytic efficiency than powder photocatalysts, they have significant advantages such as easy separation and thus reusability.…”

Section: Introductionmentioning

confidence: 99%

“…Photocatalytic Cr( vi ) reduction is a promising method due to the green procedure and low energy consumption. 19–21…”

Section: Introductionmentioning

confidence: 99%

Modulation of titania nanoflower arrays transformed from titanate nanowire arrays to boost photocatalytic Cr(vi) detoxification

Qin

Cao

Huang³

et al. 2022

New J. Chem.

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Construction of ZnO/Keggin Polyoxometalate Nano-heterojunction Catalyst for Efficient Removal of Rhodamine B in Aqueous Solution

Guo

Bai

Dong

et al. 2022

J Inorg Organomet Polym

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In this paper, we synthesized two novel heterojunction nanocomposite catalysts ZnO/Ag 4 SiW 12 O 40 and ZnO/Cs 3 PW 12 O 40 by a simple dissolution-precipitation method. The structure and morphology of the samples were analyzed by XRD, TEM, FT-IR, Raman, UV diffuse re ection, XPS and N 2 adsorption desorption isotherm. Compared with pure ZnO, the composite catalyst formed with Ag 4 SiW 12 O 40 (AgSiW) and Cs 3 PW 12 O 40 (CsPW) can signi cantly improve the problem of fast recombination rate of photogenerated carriers in ZnO, and broaden the response range of ZnO to visible light. Rhodamine B (RhB) was used as a simulated pollutant to investigate the photocatalytic degradation performance of the composite catalyst. The experimental results show that the photocatalytic degradation activity of the prepared composite catalyst is much higher than that of pure ZnO, and the degradation performance of ZnO/Ag 4 SiW 12 O 40 is stronger. Finally, the possible photocatalytic mechanism of ZnO/Ag 4 SiW 12 O 40 and ZnO/Cs 3 PW 12 O 40 heterojunction nanocomposite catalysts was proposed by UV diffuse re ection, free radical capture experiment and Mott Schottky test.

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Photocatalytic reduction of Cr(VI) by iron tungstosilicate under visible light

Cited by 16 publications

References 36 publications

Keggin Cluster Modulated Photocatalytic Activity of Aryl Sulfonium Polyoxometalate Hybrids toward Dichromate Reduction

Keggin Cluster Modulated Photocatalytic Activity of Aryl Sulfonium Polyoxometalate Hybrids toward Dichromate Reduction

Modulation of titania nanoflower arrays transformed from titanate nanowire arrays to boost photocatalytic Cr(vi) detoxification

Construction of ZnO/Keggin Polyoxometalate Nano-heterojunction Catalyst for Efficient Removal of Rhodamine B in Aqueous Solution

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