Nanohybrid MoS2-PANI-CdS photocatalyst for hydrogen evolution from water

Sasikala, R.; Gaikwad, A.P.; Jayakumar, O. D.; Girija, K.G.; Rao, Rekha; Tyagi, A. K.; Bharadwaj, S.R.

doi:10.1016/j.colsurfa.2015.06.027

Cited by 41 publications

(15 citation statements)

References 36 publications

(36 reference statements)

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“…In the spectra of CNT10%/ZnO20%/MoS 2 , the peaks at 2700 cm −1 and www.nature.com/scientificreports www.nature.com/scientificreports/ 1720 cm −1 were formed due to the vibration of -COOH groups and C=O stretching, respectively. Also, in the spectra of RGO10%/ZnO20%/MoS 2 , the peaks appearing at 2854 cm −1 and 2922 cm −1 were formed due to the C-H stretching vibration, and the peak centered at 1726 cm −1 is corresponded to the C=O stretching frequency from the residual carboxyl groups of RGO 34,37,[57][58][59] .…”

Section: Resultsmentioning

confidence: 95%

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

150

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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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Section: Resultsmentioning

confidence: 95%

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

150

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“…Time-resolved fluorescence (TRF) spectroscopy and transient absorption spectroscopy (TA) are two of the most common methods used to study these processes. In the field of surface hybridization applied in the field of photocatalysis, the former has been widely used, [131][132][133][134][135] but the latter is less attributed to the complexity of the test. To confirm the electron injection from the light-excited porphyrin dye ( 1 ZnP*) into the TiO 2 particles, the TRF measurements for ZnP CNPA -| TiO 2 , ZnP CNPA films without TiO 2 and ZnP CNPA dissolved in dimethylformamide were carried out.…”

Section: Carrier Dynamicsmentioning

confidence: 99%

Photocatalytic activity enhanced via surface hybridization

Guo

et al. 2020

Carbon Energy

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Surface hybrid inorganic semiconductors photocatalysts with π conjugated structure have recently been widely used in the field of photocatalytic environmental remediation and energy conversion. Surface hybridization is considered to be an efficient way to significantly enhance the photocatalytic activity by several times, completely inhibit photocorrosion of inorganic photocatalysts and expand the spectral response range of photocatalysts. This review provides a comprehensive overview of the surface hybridization definition, the principle of enhancing photocatalytic performance and the control factors of surface hybridization to promote photoactivity. Summarize the preparation and structural identification method of the surface hybrid photocatalyst. Special emphasis is placed on the various photocatalytic system construction of surface hybridization. The development of surface hybrid photocatalysts for pollutant degradation and energy conversion are further presented. Finally, the challenges and future development prospects of surface hybridization in photocatalysis are discussed. We hope this critical review can provide a clear picture of the state‐of‐the‐art achievements and facilitate the applications of surface hybrid photocatalysts in environmental remediation and energy conversion.

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“…The photoluminescence (PL) spectrum confirmed that the enhancement resulted from the efficient charge separation process. Sasikala et al studied the photocatalytic hydrogen production performance of MoS 2 -PANI-CdS photocatalysts [69]. The incorporation of MoS 2 and PANI improved the visible light absorption ability and improved the lifetime of photoexcited electron-hole pairs of the composite photocatalysts.…”

Section: Cadmium Sulfidementioning

confidence: 99%

“…A proposed mechanism for the electron transfer of MoS2-PANI-CdS photocatalysts when illuminated.Figure adapted from[69].…”

mentioning

confidence: 99%

Recent Progress on Metal Sulfide Composite Nanomaterials for Photocatalytic Hydrogen Production

Lee

Chang

2019

Catalysts

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Metal sulfide-based photocatalysts have gained much attention due to their outstanding photocatalytic properties. This review paper discusses recent developments on metal sulfide-based nanomaterials for H2 production, acting as either photocatalysts or cocatalysts, especially in the last decade. Recent progress on key experimental parameters, in-situ characterization methods, and the performance of the metal sulfide photocatalysts are systematically discussed, including the forms of heterogeneous composite photocatalysts, immobilized photocatalysts, and magnetically separable photocatalysts. Some methods have been studied to solve the problem of rapid recombination of photoinduced carriers. The electronic density of photocatalysts can be investigated by in-situ C K-edge near edge X-ray absorption fine structure (NEXAFS) spectra to study the mechanism of the photocatalytic process. The effects of crystal properties, nanostructure, cocatalyst, sacrificial agent, electrically conductive materials, doping, calcination, crystal size, and pH on the performance of composite photocatalysts are presented. Moreover, the facet effect and light trapping (or light harvesting) effect, which can improve the photocatalytic activity, are also discussed.

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Nanohybrid MoS2-PANI-CdS photocatalyst for hydrogen evolution from water

Cited by 41 publications

References 36 publications

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

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

Photocatalytic activity enhanced via surface hybridization

Recent Progress on Metal Sulfide Composite Nanomaterials for Photocatalytic Hydrogen Production

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