Ag Loading Enhanced Photocatalytic Activity of g-C3N4 Porous Nanosheets for Decomposition of Organic Pollutants

Qi, Kezhen; Li, Yang; Xie, Yubo; Liu, Shuyuan; Zheng, Kun; Chen, Zhe; Wang, Ruidan

doi:10.3389/fchem.2019.00091

Cited by 79 publications

(37 citation statements)

References 57 publications

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“…Notably, the PL intensity of the Cu 7 S 4 sample with nanotwinned structure decreases significantly compared with that of sample without nanotwinned building blocks, suggesting a slower recombination rate of photoinduced electrons and holes in sample with nanotwinned building blocks. The similar results are also reported in multiple literatures, for example, Shen et al (2015), Qi et al (2019) etc. The photodegradation and electrochemical impedance spectra of samples also confirm the above results (Figures 7A,B).…”

Section: Photoluminescence Spectrasupporting

confidence: 90%

Nanotwinned Structure-Dependent Photocatalytic Performances of the Multipod Frameworks of Cu7S4 Hollow Microcages

et al. 2020

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The 14-pods Cu 7 S 4 hollow microcages wholly exposed with nanotwinned building blocks were successfully prepared by an ethanol-assisted sacrificial Cu 2 O template approach. Its photocatalytic activity for the degradation of methylene blue (MB) was determined. The results suggest that the Cu 7 S 4 microcages with nanotwinned building blocks possess higher catalytic activity than the Cu 7 S 4 microcages without the nanotwinned structures, suggesting that the special nanotwinned components can improve the catalytic performance of the multipod framework. Further investigate reveals that the nanotwins inside the Cu 7 S 4 microcages can facilite the transport of free charges, decrease the recombination of photoinduced electrons and holes, and elongate the lifetime of the electron-hole pairs. Our work will provide powerful evidence that the nanotwinned building blocks of the synthesized Cu 7 S 4 microcages play a crucial role for the high catalytic activity.

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Section: Photoluminescence Spectrasupporting

confidence: 90%

Nanotwinned Structure-Dependent Photocatalytic Performances of the Multipod Frameworks of Cu7S4 Hollow Microcages

et al. 2020

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“…Powder X-ray diffraction (XRD) pattern of the fabricated BZnO and FZnO nanoparticles are recorded by Philips X-ray Diffractrometer (X' Pert Pro) with Cu K α1 radiation (λ = 1.5406 Å). Field Effect Scanning Electron Microscope (MIRA3 TESCAN) and Transmission Electron Microscope (JEM-2100, Jeol) were used for confirmation of FZnO microstructures 20 . The optical absorption spectra of ZnO dispersed in methylene blue (MB) dye are recorded by a UV-vis spectrophotometer (HITACHI U -3210).…”

Section: Methodsmentioning

confidence: 99%

“…Besides, capping agent PVP tends to adsorb on the {10-10} planes of the six symmetric side facets of the growth nuclei, thereby it allows to occur only along the polar axis 14,20,21 .…”

Section: +mentioning

confidence: 99%

Antibacterial and nonlinear dynamical analysis of flower and hexagon-shaped ZnO microstructures

Saha

Debanath

Paul

et al. 2020

Sci Rep

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The present study reports the antibacterial properties of flower-shaped ZnO (FZnO) microstructures and its comparison with that of hexagon-shaped bulk ZnO (BZnO) nanostructures. The samples are prepared successfully by wet chemical method and the surface morphologies, structures and size of the ZnO samples are characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), BET adsorption isotherm, and Photoluminescence (PL) Spectroscopy. The SEM and TEM images of the sample have confirmed flower-shaped structure of the ZnO. The materials are also analyzed by using an innovative tool called Lacunarity, a nonlinear dynamical (NLD) tool for proper understanding of the inherent surface properties of the particles formed, comparing the results estimated with the BET results obtained, thereby confirming our proposition to use it as an important parameter in predictive models. In this new approach, geometry of the surface structure is being associated with biological properties, in order to come up with easier ways to identify materials for any such applications where rich surface structure is desired. The photocatalytic activity of the flower-shaped material is carried out to find out its optical properties as another marker for confirming the antimicrobial activities. It has been reported for the first time that the prominent antibacterial activities are favoured by the FZnO microstructure having lesser Lacunarity, significantly better than its bulk counterpart, for inhibiting gram negative-Escherichia coli microorganism. Nanotechnology, at present, pertains to creation of useful materials, devices, and systems through appropriate manipulation of matter. A significant number of researchers have reported that formation of ZnO nanostructures in different shapes, such as, nanorod, nanoplates, nanowire 1 , flower-shaped ZnO microstructures 2 , etc. In the present work, two important attributes, capping and molarity, are used to control the particle size and their agglomeration 3. It is reported in W Yu et al. (2016), that photo-generated electrons in ZnO are much lighter than their corresponding holes, which indicates that it belongs to the n-type semiconductor 4. This result paves the way for obtaining excitation energy of electrons in ZnO that determines its optical property. ZnO materials are good inhibitors of microorganisms, and it is believed that this activity is enhanced in case of ZnO due to its high surface morphology. The capped ZnO usually shows up higher antibacterial activity than the uncapped one 5. In the present work, flower-shaped ZnO (FZnO) microstructures in PVP matrix and uncapped hexagon-shaped bulk ZnO (BZnO) nanostructures are synthesized for the study of their antimicrobial properties. The as-prepared samples are characterized by X-ray diffraction (XRD) 6 , Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) to find their size and shape 7,8. Further, the FZnO are characterized by UV-spectra, Photoluminescence (PL) Spec...

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“…Studies based on g-C 3 N 4 have been mostly carried out in attempt to reduce the recombination rate of photogenerated electron-hole pairs, in addition to reduce the energy band gap. Effective procedures may be referred to as—(i) creating heterojunctions like semiconductor-semiconductor [ 29 , 30 , 31 ] or metal-semiconductor [ 32 , 33 , 34 ] in order to effectively separate electrons and holes; (ii) doping metallic elements into g-C 3 N 4 as electron trapping centers [ 35 , 36 ], leaving highly oxidized holes. Recent works showed that the incorporation of metal ions into g-C 3 N 4 polymerization network not only improves charge carrier lifetime and mobilities but also reduces the band gap of g-C 3 N 4 .…”

Section: Introductionmentioning

confidence: 99%

Fe-Doped g-C3N4: High-Performance Photocatalysts in Rhodamine B Decomposition

et al. 2020

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Herein, Fe-doped C3N4 high-performance photocatalysts, synthesized by a facile and cost effective heat stirring method, were investigated systematically using powder X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM) and Brunauer–Emmett–Teller (BET) surface area measurement, X-ray photoelectron (XPS), UV–Vis diffusion reflectance (DRS) and photoluminescence (PL) spectroscopy. The results showed that Fe ions incorporated into a g-C3N4 nanosheet in both +3 and +2 oxidation states and in interstitial configuration. Absorption edge shifted slightly toward the red light along with an increase of absorbance in the wavelength range of 430–570 nm. Specific surface area increased with the incorporation of Fe into g-C3N4 lattice, reaching the highest value at the sample doped with 7 mol% Fe (FeCN7). A sharp decrease in PL intensity with increasing Fe content is an indirect evidence showing that electron-hole pair recombination rate decreased. Interestingly, Fe-doped g-C3N4 nanosheets present a superior photocatalytic activity compared to pure g-C3N4 in decomposing RhB solution. FeCN7 sample exhibits the highest photocatalytic efficiency, decomposing almost completely RhB 10 ppm solution after 30 min of xenon lamp illumination with a reaction rate approximately ten times greater than that of pure g-C3N4 nanosheet. This is in an agreement with the BET measurement and photoluminescence result which shows that FeCN7 possesses the largest specific surface area and low electron-hole recombination rate. The mechanism of photocatalytic enhancement is mainly explained through the charge transfer processes related to Fe2+/Fe3+ impurity in g-C3N4 crystal lattice.

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Ag Loading Enhanced Photocatalytic Activity of g-C3N4 Porous Nanosheets for Decomposition of Organic Pollutants

Cited by 79 publications

References 57 publications

Nanotwinned Structure-Dependent Photocatalytic Performances of the Multipod Frameworks of Cu7S4 Hollow Microcages

Nanotwinned Structure-Dependent Photocatalytic Performances of the Multipod Frameworks of Cu7S4 Hollow Microcages

Antibacterial and nonlinear dynamical analysis of flower and hexagon-shaped ZnO microstructures

Fe-Doped g-C3N4: High-Performance Photocatalysts in Rhodamine B Decomposition

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