A ternary photocatalyst of graphitic carbon nitride/cadmium sulfide/titania based on the electrostatic assembly using two-dimensional semiconductor nanosheets

Zhou, Chenjuan; Qian, Jiajia; Jun-ping, Yan; Dong, Xiaoping; Zhou, Bingwei

doi:10.1016/j.jcis.2016.12.056

Cited by 27 publications

(6 citation statements)

References 49 publications

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“…More recently, Dong et al. synthesized CN/CdS/titania nanosheets (TNS) composites, and found that the encapsulation structure of CdS@nanosheets with an intimate interface favored the photoexcited carrier transfer, and thus, improved the photocatalytic performance for the degradation of organic dyes under visible‐light irradiation . Notably, semiconductor quantum dots (QDs), such as CdS, CdSe, and CdTe, have been decorated on other semiconductors to improve their optical absorbance and assist charge transfer.…”

Section: Introductionsupporting

confidence: 56%

WS₂/Graphitic Carbon Nitride Heterojunction Nanosheets Decorated with CdS Quantum Dots for Photocatalytic Hydrogen Production

et al. 2018

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Two-dimensional/two-dimensional (2D/2D) stacking heterostructures are highly desirable in fabricating efficient photocatalysts because face-to-face contact can provide a maximized interfacial region between the two semiconductors; this largely facilitates the migration of charge carriers. Herein, a WS /graphitic carbon nitride (CN) 2D/2D nanosheet heterostructure decorated with CdS quantum dots (QDs) has been designed, for the first time. Optimized CdS/WS /CN without another cocatalyst exhibits a significantly enhanced photocatalytic H evolution rate of 1174.5 μmol h g under visible-light irradiation (λ>420 nm), which is nearly 67 times higher than that of the pure CN nanosheets. The improved photocatalytic activity can be primarily attributed to the highly efficient charge-transfer pathways built among the three components, which effectively accelerate the separation and transfer of photogenerated electrons and holes, and thus, inhibit their recombination. Moreover, the extended light-absorption range also contributes to excellent photocatalytic efficiency. In addition, the CdS/WS /CN photocatalyst shows excellent stability and reusability without apparent decay in the photocatalytic H evolution within 4 cycles in 20 h. It is believed that this work may shed light on specifically designed 2D/2D nanosheet heterostructures for more efficient visible-light-driven photocatalysts.

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Section: Introductionsupporting

confidence: 56%

WS₂/Graphitic Carbon Nitride Heterojunction Nanosheets Decorated with CdS Quantum Dots for Photocatalytic Hydrogen Production

et al. 2018

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“…So far, transition metal sulfide semiconductors such as CdS, MoS 2 , and WS 2 have achieved much attention because of their narrow bandgap and their ability to separate charges under the visible light [24][25][26][27][28] . MoS 2 with a 2D layered structure and a narrow bandgap of 2 eV is capable to absorb noticeable amount of light, with excellent thermal and chemical stability.…”

mentioning

confidence: 99%

Developing the Ternary ZnO Doped MoS2 Nanostructures Grafted on CNT and Reduced Graphene Oxide (RGO) for Photocatalytic Degradation of Aniline

Ghasemipour

Fattahi

Rasekh

et al. 2020

Sci Rep

136

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Transition metal sulfide semiconductors have achieved significant attention in the field of photocatalysis and degradation of pollutants. MoS 2 with a two dimensional (2D) layered structure, a narrow bandgap and the ability of getting excited while being exposed to visible light, has demonstrated great potential in visible-light-driven photocatalysts. However, it possesses fast-paced recombination of charges. in this study, the coupled MoS 2 nanosheets were synthesized with Zno nanorods to develop the heterojunctions photocatalyst in order to obtain superior photoactivity. the charge transfer in this composite is not adequate to achieve desirable activity. therefore, heterojunction was modified by reduced graphene oxide (RGO) nanosheets and carbon nanotubes (cnts) to develop the RGo/Zno/MoS 2 and cnts/Zno/MoS 2 ternary nanocomposites. the structure, morphology, composition, optical and photocatalytic properties of the as-fabricated samples were characterized through X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), Field Emission Scanning electron Microscopy (feSeM), transmission electron Microscopy (teM), energy-Dispersive X-ray (eDX), elemental mapping, photoluminescence (pL), Ultraviolet-Visible spectroscopy (UV-ViS), and Brunauer-emmett-teller (Bet) techniques. the photo-catalytic performance of all samples was evaluated through photodegradation of aniline in aqueous solution. the combination of RGo or cnts into the Zno/MoS 2 greatly promoted the catalytic activity. However, the resulting RGo/Zno/MoS 2 ternary nanocomposites showed appreciably increased catalytic performance, faster than that of cnts/Zno/MoS 2. charge carrier transfer studies, the Bet surface area analysis, and the optical studies confirmed this superiority. The role of operational variables namely, solution pH, catalyst dosage amount, and initial concentration of aniline was then investigated for obtaining maximum degradation. complete degradation was observed, in the case of pH = 4, catalyst dosage of 0.7 g/L and aniline concentration of 80 ppm, and light intensity of 100 W. According to the results of trapping experiments, hydroxyl radical was found to be the main active species in the photocatalytic reaction. Meanwhile, a plausible mechanism was proposed for describing the degradation of aniline upon ternary composite. Moreover, the catalyst showed excellent reusability and stability after five consecutive cycles due to the synergistic effect between its components. Total-Organic-Carbon concentration (TOC) results suggested that complete mineralization of aniline occurred after 210 min of irradiation. Finally, a real petrochemical wastewater sample was evaluated for testing the catalytic ability of the as-fabricated composites in real case studies and it was observed that the process successfully quenched 100% and 93% of Chemical Oxygen Demand (COD) and TOC in the wastewater, respectively.

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“…The corresponding UV–vis absorption spectra of all samples were studied to reveal their optical absorption properties. As displayed in Figure a, pure In 2 O 3 can absorb the light source less than 450 nm wavelength because of the large band gap (2.8 eV). , By contrast, narrow band gap semiconductor CdS (2.4 eV) exhibited a wide absorption edge at about 580 nm. ,, Compared with pristine In 2 O 3 , the decoration with Au NPs caused an enhancement of the visible-light absorption (Figure S2b) because of the SPR effect of Au, − and the optical absorption increased with the introduction of Au NPs. The deposition of CdS QDs led to the red-shifted absorption edge, whether for In 2 O 3 /CdS- y (Figure S3b) or for In 2 O 3 /Au/CdS- y (Figure a).…”

Section: Resultsmentioning

confidence: 99%

“…12,14 By contrast, narrow band gap semiconductor CdS (2.4 eV) exhibited a wide absorption edge at about 580 nm. 18,27,58 Compared with pristine In 2 O 3 , the decoration with Au NPs caused an enhancement of the visible-light absorption (Figure S2b) because of the SPR effect of Au, 59−62 and the optical absorption increased with the introduction of Au NPs. The deposition of CdS QDs led to the red-shifted absorption edge, whether for In 2 O 3 /CdS-y (Figure S3b) or for In 2 O 3 /Au/ CdS-y (Figure 6a).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Au Nanoparticle and CdS Quantum Dot Codecoration of In₂O₃ Nanosheets for Improved H₂ Evolution Resulting from Efficient Light Harvesting and Charge Transfer

Shi

Sun

et al. 2018

ACS Sustainable Chem. Eng.

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Au nanoparticle (NP)- and CdS quantum dot (QD)-codecorated In2O3 nanosheets, assembled into flowerlike structure (In2O3/Au/CdS), were synthesized to facilitate photocatalytic H2 production. The optimized In2O3/Au4/CdS-12 (4 wt % Au NPs and CdS QDs were deposited for 12 cycles) displays achieved a photocatalytic hydrogen generation ability of 17.23 μmol/h (10 mg of catalyst), which is 22.97, 5.08, and 5.05 times as high as that of pristine In2O3 (0.75 μmol/h), In2O3/Au4 (3.39 μmol/h), and In2O3/CdS-12 (3.41 μmol/h), respectively. This significant improvement of H2 generation rate can be attributed to the following factors: the heterojunction at the In2O3–CdS interface and the Schottky barrier at the interface between In2O3–Au and CdS–Au improves the migration and separation of charge carriers, and the surface plasma resonance (SPR) effect of noble metal Au NPs enhances the light harvesting capacity of In2O3 and boosts the generation of hot electrons, efficiently improving the utilization rate of sunlight.

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A ternary photocatalyst of graphitic carbon nitride/cadmium sulfide/titania based on the electrostatic assembly using two-dimensional semiconductor nanosheets

Cited by 27 publications

References 49 publications

WS₂/Graphitic Carbon Nitride Heterojunction Nanosheets Decorated with CdS Quantum Dots for Photocatalytic Hydrogen Production

WS₂/Graphitic Carbon Nitride Heterojunction Nanosheets Decorated with CdS Quantum Dots for Photocatalytic Hydrogen Production

Developing the Ternary ZnO Doped MoS2 Nanostructures Grafted on CNT and Reduced Graphene Oxide (RGO) for Photocatalytic Degradation of Aniline

Au Nanoparticle and CdS Quantum Dot Codecoration of In₂O₃ Nanosheets for Improved H₂ Evolution Resulting from Efficient Light Harvesting and Charge Transfer

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A ternary photocatalyst of graphitic carbon nitride/cadmium sulfide/titania based on the electrostatic assembly using two-dimensional semiconductor nanosheets

Cited by 27 publications

References 49 publications

WS2/Graphitic Carbon Nitride Heterojunction Nanosheets Decorated with CdS Quantum Dots for Photocatalytic Hydrogen Production

WS2/Graphitic Carbon Nitride Heterojunction Nanosheets Decorated with CdS Quantum Dots for Photocatalytic Hydrogen Production

Developing the Ternary ZnO Doped MoS2 Nanostructures Grafted on CNT and Reduced Graphene Oxide (RGO) for Photocatalytic Degradation of Aniline

Au Nanoparticle and CdS Quantum Dot Codecoration of In2O3 Nanosheets for Improved H2 Evolution Resulting from Efficient Light Harvesting and Charge Transfer

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WS₂/Graphitic Carbon Nitride Heterojunction Nanosheets Decorated with CdS Quantum Dots for Photocatalytic Hydrogen Production

WS₂/Graphitic Carbon Nitride Heterojunction Nanosheets Decorated with CdS Quantum Dots for Photocatalytic Hydrogen Production

Au Nanoparticle and CdS Quantum Dot Codecoration of In₂O₃ Nanosheets for Improved H₂ Evolution Resulting from Efficient Light Harvesting and Charge Transfer