One-step hydrothermal synthesis of high-performance visible-light-driven SnS2/SnO2 nanoheterojunction photocatalyst for the reduction of aqueous Cr(VI)

Zhang, Yongcai; Long, Yao; Zhang, Geshan; Dionysiou, Dionysios D.; Li, Jing; Du, Xiaosheng

doi:10.1016/j.apcatb.2013.08.006

Cited by 329 publications

(109 citation statements)

References 71 publications

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“…Prior to illumination, the solution was stirred for 60 min in the dark to reach adsorption-desorption equilibrium and then was exposed to light irradiation. The concentration of Cr(VI) was measured by using the diphenylcarbazide (DPC) method [30]. The evolution of concentration of Cr(VI) was determined by the absorbance at 540 nm on UV−8000A spectrophotometer (Yuanxi, Shanghai).…”

Section: Photocatalytic Experimentsmentioning

confidence: 99%

Multicycle photocatalytic reduction of Cr(VI) over transparent PVA/TiO2 nanocomposite films under visible light

et al. 2017

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Photocatalytic reduction of hexavalent chromium in wastewater has been widely investigated as an attractive treatment method. In this work, we reported an efficient method for photocatalytic reduction of Cr(VI) over transparent polyvinyl alcohol/titanium dioxide (PVA/TiO2) nanocomposite films under sunlight irradiation. The transparent PVA/TiO2 nanocomposite films were prepared by a simple hydrothermal method combined with a solution casting process. The results revealed that the anatase TiO2 nanoparticles with size less than 10 nm were in-situ generated in PVA matrix, which endowed the films with high transparency. Photocatalytic reduction of Cr(VI) over PVA/TiO2 nanocomposite films exhibited superior visible light photocatalytic activity. Mechanism investigation demonstrated that the PVA acted not only as a transparent support for TiO2 nanoparticles, but also as holes scavengers simultaneously to improve the separation of photogenerated holes and electrons. Meanwhile, the transparent PVA/TiO2 nanocomposite films displayed remarkable stability and excellent recyclability during multicycle Cr(VI) photoreduction. Furthermore, the PVA/TiO2 nanocomposite films showed selective adsorption ability for Cr(III), and thus totally removal of Cr(VI) was achieved after photoreduction process.

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Section: Photocatalytic Experimentsmentioning

confidence: 99%

Multicycle photocatalytic reduction of Cr(VI) over transparent PVA/TiO2 nanocomposite films under visible light

et al. 2017

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“…Figure 3(b) displays that the two strong peaks at around (487.43 eV, 495.90 eV) and (486.64 eV, 495.05 eV) for the bare SnO 2 and S2-SnO 2 sample, respectively, which is attributed to Sn 3d 5=2 and 3d 3=2 . 32,33,39,42,44 Compared with the bare SnO 2 sample, the downshift of Sn 3d peaks of the S2-SnO 2 can be assigned to the replacement of higher electro-negative oxygen by lower electronegative sulfur. 39,45 Figure 3(c) presents the O1s spectrum, in which the peak (centered at about 531.01 eV) was attributed to the coordination of oxygen in Sn-O-Sn for the bare SnO 2 sample.…”

Section: -3mentioning

confidence: 99%

“…39,45 Figure 3(c) presents the O1s spectrum, in which the peak (centered at about 531.01 eV) was attributed to the coordination of oxygen in Sn-O-Sn for the bare SnO 2 sample. 32,33,39,42,44 As for the S2-SnO 2 sample, the O1s peak situated at 531.81 exhibits an upshift in comparison with the bare SnO 2 sample, which could be related to the O bound to Sn and S. 42,46 In addition, it can be seen from Fig. 3(d) that the S 2p core-level XPS spectrum of the S2-SnO 2 sample can be divided into two peaks, which indicates that there exist two chemical environments.…”

Section: -3mentioning

confidence: 99%

“…The peaks at 161.11 eV and 162.67 eV could be attributed to the binding energies of S2p 3=2 and S2p 1=2 . 32,33,39,42,44 The XRD, …”

Section: -3mentioning

confidence: 99%

“…[23][24][25][26] For example, combination of SnO 2 with SnS 2 to fabricate SnO 2 /SnS 2 hetero-nanostructures has demonstrated enhanced photocatalytic activity because of improved charge separation of photo-generated carriers through interfacial charge transfer. [27][28][29][30][31][32][33] Additionally, chemical doping is also an e®ective strategy to narrow the bandgap by modifying the electronic structures of semiconductors as well as their surface properties, thus improving their photocatalytic performances. 34 Recently, it is found that suitable metal ions doped SnO 2 may increase the photocatalytic e±ciency by increasing the charge separation.…”

Section: Introductionmentioning

confidence: 99%

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One-Pot Hydrothermal Synthesis of Sulfur-Doped SnO₂ Nanoparticles and their Enhanced Photocatalytic Properties

et al. 2016

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Sulfur-doped SnO 2 nanoparticles with ultra¯ne sizes have been successfully prepared by a one-pot hydrothermal method. The obtained samples are characterized by X-ray di®raction (XRD), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HRTEM), thermogravimetric (TG), analyzer UV-Vis spectroscopy, photoluminescence (PL) and electrochemical impedance spectroscopy (EIS). The experimental results indicate that the doping level of sulfur element as well as the bandgaps of SnO 2 can be controlled to a certain extent by varying the amount of L-cysteine (L-cys). When evaluated as photocatalysts in the degradation of rhodamine B (RhB) and reduction of Cr(VI) under visible light region, the resultant sulfur-doped SnO 2 nanoparticles demonstrate obviously enhanced photocatalytic activities due to the markedly improved visible light response and e®ective separation of the photo-generated electron-hole pairs.

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Nanostructured Metal Sulfides: Classification, Modification Strategy, and Solar‐Driven CO₂ Reduction Application

Wang

Lin

Tian

et al. 2020

Adv Funct Materials

282

170

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Solar‐driven conversion of CO2 into high value‐added fuels is expected to be an environmental‐friendly and sustainable approach for relieving the greenhouse gas effect and countering energy crisis. Metal sulfide semiconductors with wide photoresponsive range and favorable band structures are suitable photocatalysts for CO2 photoreduction. This review summarizes the recent progress on metal sulfide semiconductors for photocatalytic CO2 reduction. First, the fundamentals, mechanisms and some principles, like product selectivity, of photocatalytic CO2 reduction are introduced. Then, according to the elemental composition, the metal sulfide photocatalysts applied for CO2 reduction are classified into binary (CdS, ZnS, MoS2, SnS2, Bi2S3, In2S3,Cu2S, NiS/NiS2, and CoS2), ternary (ZnIn2S4, CdIn2S4, CuInS2, Cu3SnS4, and CuGaS2), and quaternary (Cu2ZnSnS4) systems, in which their crystal structures, photochemical characteristics, and photocatalytic CO2 reduction applications are systematically demonstrated. Especially, the diverse modification strategies for improving the activity and product selectivity of photocatalytic CO2 reduction on these metal sulfides are summarized. Finally, the current challenges and future directions for the development of metal sulfide photocatalysts for CO2 reduction are proposed. This review is expected to serve as a powerful reference for exploiting high‐efficiency metal sulfide photocatalysts for CO2 conversion and furthering related mechanism understanding.

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One-step hydrothermal synthesis of high-performance visible-light-driven SnS2/SnO2 nanoheterojunction photocatalyst for the reduction of aqueous Cr(VI)

Cited by 329 publications

References 71 publications

Multicycle photocatalytic reduction of Cr(VI) over transparent PVA/TiO2 nanocomposite films under visible light

Multicycle photocatalytic reduction of Cr(VI) over transparent PVA/TiO2 nanocomposite films under visible light

One-Pot Hydrothermal Synthesis of Sulfur-Doped SnO₂ Nanoparticles and their Enhanced Photocatalytic Properties

Nanostructured Metal Sulfides: Classification, Modification Strategy, and Solar‐Driven CO₂ Reduction Application

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One-step hydrothermal synthesis of high-performance visible-light-driven SnS2/SnO2 nanoheterojunction photocatalyst for the reduction of aqueous Cr(VI)

Cited by 329 publications

References 71 publications

Multicycle photocatalytic reduction of Cr(VI) over transparent PVA/TiO2 nanocomposite films under visible light

Multicycle photocatalytic reduction of Cr(VI) over transparent PVA/TiO2 nanocomposite films under visible light

One-Pot Hydrothermal Synthesis of Sulfur-Doped SnO2 Nanoparticles and their Enhanced Photocatalytic Properties

Nanostructured Metal Sulfides: Classification, Modification Strategy, and Solar‐Driven CO2 Reduction Application

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Product

Resources

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One-Pot Hydrothermal Synthesis of Sulfur-Doped SnO₂ Nanoparticles and their Enhanced Photocatalytic Properties

Nanostructured Metal Sulfides: Classification, Modification Strategy, and Solar‐Driven CO₂ Reduction Application