Mass Production and High Photocatalytic Activity of ZnS Nanoporous Nanoparticles

Hu, Jin‐Song; Ren, Lingling; Guo, Yu‐Guo; Liang, Han‐Pu; A, Cao; Li, Wan; Chen, Bai

doi:10.1002/ange.200462057

Cited by 217 publications

(112 citation statements)

References 41 publications

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“…It is noteworthy that the highest quantum yields of CO 2 photoreduction, in the range of 10-80%, were obtained, by various research groups [144,145,148,149,155,273], with ZnS nanoparticlesanalogues to those ejected by hydrothermal vents. These nanoparticles are particularly photosynthetically active since the probability of electron trapping at the surface increases with the surface/volume ratio [241,276]. Studies of the photoelectrochemical reduction of CO 2 at p-type semiconductors showed that at high CO 2 pressure the rate of reduction was principally limited only by light intensity [277].…”

Section: Photosynthesis In the Zn Worldmentioning

confidence: 99%

Inorganic Polyphosphate Modulates TRPM8 Channels

Trimm¹

2011

Inorganic Chemistry

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Section: Photosynthesis In the Zn Worldmentioning

confidence: 99%

Inorganic Polyphosphate Modulates TRPM8 Channels

Trimm¹

2011

Inorganic Chemistry

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“…22 In photocatalysis, particularly when using CN photocatalysts, morphology and surface area, in relation to the effective charge separation, are important parameters. [23][24][25][26][27][28][29][30] Density functional theory (DFT) is a useful and powerful technique to obtain the relevant photophysical and optoelectronic parameters of a given photocatalyst. 31,32 In addition to structure determination, DFT calculations can lead to the simulation of several semiconductor properties such as the bandgap, the dielectric constants and band positions, with good accuracy thanks to recently developed functionals such as HSE06.…”

Section: Introductionmentioning

confidence: 99%

Dendritic Tip-on Polytriazine-Based Carbon Nitride Photocatalyst with High Hydrogen Evolution Activity

Bhunia¹,

Melissen

Parida³

et al. 2015

Chem. Mater.

143

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Developing stable, ubiquitous and efficient water-splitting photocatalyst material that has extensive absorption in the visible-light range is desired for a sustainable solar energy-conversion device. We herein report a triazine-based carbon nitride (CN) material with different C/N ratios achieved by varying the monomer composition ratio between melamine (Mel) and 2,4,6-triaminopyrimidine (TAP). The CN material with a different C/N ratio was obtained through a two-step synthesis protocol: starting with the solution state dispersion of the monomers via hydrogen-bonding supramolecular aggregate, followed by a salt-melt high temperature polycondensation. This protocol ensures the production of a highly crystalline polytriazine imide (PTI) structure consisting of a copolymerized Mel-TAP network. The observed bandgap narrowing with an increasing TAP/Mel ratio is well simulated by density functional theory (DFT) calculations, revealing a negative shift in the valence band upon substitution of N with CH in the aromatic rings. Increasing the TAP amount could not maintain the crystalline PTI structure, consistent with DFT calculation showing the repulsion associated with additional C-H introduced in the aromatic rings. Due to the high exciton binding energy calculated by DFT for the obtained CN, the cocatalyst must be close to any portion of the material to assist the separation of excited charge carriers for an improved photocatalytic performance. The photocatalytic activity was improved by providing a dendritic tipon-like shape grown on a porous fibrous silica KCC-1 spheres, and highly dispersed Pt nanoparticles (<5 nm) were photodeposited to introduce heterojunction. As a result, the Pt/CN/KCC-1 photocatalyst exhibited an apparent quantum efficiency (AQE) as high as 22.1 ± 3% at 400 nm and the silica was also beneficial for improving photocatalytic stability. The results obtained by time-resolved transient absorption spectroscopy measurements were consistent with the improved photocatalytic activity with the slowest carrier recombination for the optimized CN photocatalyst.

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“…Typical examples are in flat-panel displays, electroluminescence devices, IR windows [11,12], sensors, lasers, and ultraviolet-emitting diodes [13,14]. Due to its non-toxicity, zinc sulphide is now used in waste water treatment as a photocatalyst in the degradation of organic pollutants such as dyes, halogenated derivatives, and pnitrophenol [15][16][17][18]. ZnS can be prepared in various dimensions, such as isotropic dots, spheres, and anisotropic sheets, platelets, and diskettes [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Laser-assisted synthesis, and structural and thermal properties of ZnS nanoparticles stabilised in polyvinylpyrrolidone

Onwudiwe

Krüger

Jordaan

et al. 2014

Applied Surface Science

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Research Highlights-Zinc sulphide (ZnS) nanoparticles were synthesised by laser irradiation -The structural and morphological properties of the prepared samples were analysed -Larger particles were obtained by using Na 2 S instead of TAA as the sulphur source.-Phonon softening and line broadening of the peaks were observed -Size reduction occurred in the samples obtained from both sources Graphical Abstract AbstractZinc sulphide (ZnS) nanoparticles have been synthesised by a green approach involving laser irradiation of an aqueous solution of zinc acetate (Znac 2 ) and sodium sulphide (Na 2 S·9H 2 O) or thioacetamide (TAA) in polyvinylpyrrolidone (PVP). The structural and morphological properties of the prepared samples were analysed using a transmission electron microscope, TEM, a high resolution transmission electron microscope, HRTEM, X-ray diffraction, and Raman spectroscopy.The thermal properties were studied using a simultaneous thermal analyser (SDTA). Better dispersed and larger particles were obtained by using sodium sulphide (Na 2 S) instead of TAA as the sulphur source. X-ray diffraction (XRD) analyses and Raman measurement show that the particles have a cubic structure, which is usually a low temperature phase of ZnS. There were phonon softening and line broadening of the peaks which are attributed to the phonon confinement effect. The average crystallite size of the ZnS nanoparticles estimated from the XRD showed a reduction in size from 13.62 to 10.42 nm for samples obtained from Na 2 S, and 9.13 to The absorption spectra showed that the nanoparticles exhibit quantum confinement effects.

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Mass Production and High Photocatalytic Activity of ZnS Nanoporous Nanoparticles

Cited by 217 publications

References 41 publications

Inorganic Polyphosphate Modulates TRPM8 Channels

Inorganic Polyphosphate Modulates TRPM8 Channels

Dendritic Tip-on Polytriazine-Based Carbon Nitride Photocatalyst with High Hydrogen Evolution Activity

Laser-assisted synthesis, and structural and thermal properties of ZnS nanoparticles stabilised in polyvinylpyrrolidone

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