Microwave synthesis of metal-doped ZnS photocatalysts and applications on degrading 4-chlorophenol using heterogeneous photocatalytic ozonation process

Wang, Wenmin; Lee, Gang-Juan; Wang, Peng; Qiao, Zhenghao; Liu, Na; Wu, Jerry J.

doi:10.1016/j.seppur.2019.116469

Cited by 35 publications

(17 citation statements)

References 63 publications

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“…While Bi 3+ doped with ZnS nanoparticles the 2theta angle shifts lower side. the similar shift due to Bi 3+ was reported in the literature [23] The dislocation density (δ) is measured using the relation, δ = 1/D 2 . The crystal size of Cd 0.9-x Zn 0.1 Bi x S QDs was increased up to 5.98 nm after Bi 3+ doped (x = 0.05).…”

Section: Structural Analysissupporting

confidence: 55%

Role of Bi3+ ions on structural, optical, photoluminescence and electrical performance of Cd0.9-xZn0.1BixS QDs

et al. 2021

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In this work, the Cd0.9-xZn0.1BixS QDs with different compositions of Bi3+ ions (0 ≤ x ≤ 0.05) were synthesized using a facile chemical route. The prepared QDs were characterized for analyzing the structural, morphological, elemental, optical, band gap, photoluminescence and electrochemical properties. XRD results confirmed that the Cd0.9-xZn0.1BixS QDs have a cubic structure. The mean crystallite size was increased from ~ 2 to ~ 5 nm for the increase of Bi3+ ions concentration. The optical transmittance behavior was decreased with increasing Bi3+ ions. The scanning electron microscope images showed that the prepared QDs possessed agglomerated morphology and the EDAX confirmed the presence of doped elements as per stoichiometry ratio. The optical band gap was slightly blue-shifted for initial substitution (Bi3+ = 1%) of Bi3+ ions and red-shifted for further increase of Bi3+ compositions. The optical band gap was ranged between 3.76 and 4.0 eV. High intense red emission was received for Bi3+ (1%) doped Zn:CdS QDs. The red emission peaks were shifted to a higher wavelength side due to the addition of Bi3+ ions. The PL emission on UV-region was raised for Bi3+ (1%) and it was diminished. Further, a violet (422 nm) and blue (460 nm) emission were received for Bi3+ ions doping. The cyclic voltammetry analysis showed that Bi3+ (0%) possessed better electrical properties than other compositions of Bi3+ ions.

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Section: Structural Analysissupporting

confidence: 55%

Role of Bi3+ ions on structural, optical, photoluminescence and electrical performance of Cd0.9-xZn0.1BixS QDs

et al. 2021

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“…The main peaks are located at 28.74 • , 47.96 • , and 56.65 • , which corresponds to the (111), (220), and (311) planes, respectively (JCPDS card No. 05-0566), and they are closely related to the synthesized pristine ZnS and ZnS/COF composite photocatalysts [11]. The diffraction peak of the ZnS/COF composite photocatalyst was not significantly different from that of pristine ZnS, indicating that the addition of covalent organic framework materials had negligible effects on the crystalline structure of the ZnS/COF composite photocatalyst [18].…”

Section: Characterizations Of Zns/cofmentioning

confidence: 74%

“…Nevertheless, those Zn/COF at different doses could not effectively harvest the simulated solar light to split the water into hydrogen with such potential locations of conduction bands. The characteristic of ZnS/0.5COF compared with the other COF dose was relatively beneficial for enhancing the ability of photocatalytic hydrogen production by photo-generated electrons [11].…”

Section: Characterizations Of Zns/cofmentioning

confidence: 96%

“…In materials, if the size of the dopant ion is different from that of the host ion, the diffraction peak position is shifted. As the ionic radius of copper (0.057 nm) is slightly smaller than the host zinc ion (0.060 nm), the peak position should ideally shift towards a higher scattering angle [11]. In the present study, however, a slight shift of 2θ towards a lower angle was observed; this discrepancy may be due to the position of the dopant in the crystal, indicating that the Cu ion is located in the gap rather than being substituted [22].…”

Section: Characterizations Of Cu/zns/cofmentioning

confidence: 99%

“…Thus, its photocatalytic application is substantially limited [9]. Previous studies demonstrated that doping copper ions into ZnS can exhibit excellent catalytic properties by effectively minimizing the band gap and inhibiting the recombination of electron-hole pairs [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Hydrogen Evolution from Water Splitting Using Core-Shell Structured Cu/ZnS/COF Composites

Wang

Yang

et al. 2021

Nanomaterials

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Hydrogen is considered to be a very efficient and clean fuel since it is a renewable and non-polluting gas with a high energy density; thus, it has drawn much attention as an alternative fuel, in order to alleviate the issue of global warming caused by the excess use of fossil fuels. In this work, a novel Cu/ZnS/COF composite photocatalyst with a core–shell structure was synthesized for photocatalytic hydrogen production via water splitting. The Cu/ZnS/COF microspheres formed by Cu/ZnS crystal aggregation were covered by a microporous thin-film COF with a porous network structure, where COF was also modified by the dual-effective redox sites of C=O and N=N. The photocatalytic hydrogen production results showed that the hydrogen production rate reached 278.4 µmol g−1 h−1, which may be attributed to its special structure, which has a large number of active sites, a more negative conduction band than the reduction of H+ to H2, and the ability to inhibit the recombination of electron–hole pairs. Finally, a possible mechanism was proposed to effectively explain the improved photocatalytic performance of the photocatalytic system. The present work provides a new concept, in order to construct a highly efficient hydrogen production catalyst and broaden the applications of ZnS-based materials.

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Metal Sulfide‐Based Nanoarchitectures for Energetic and Environmental Applications

Liu,

Li,

Zhong

et al. 2024

Small Structures

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Despite their numerous excellent properties, metal sulfides are not particularly efficient at converting energy and purifying the environment, which limits their further applications. Fortunately, the energy conversion and environmental purification efficiencies of these materials have experienced notable advancements in recent years, accompanied by an improved understanding of their underlying mechanisms. Herein, progress in experimental researches in recent years on the engineering of single component metal sulfides by controlling morphology, construction of heterojunctions, and incorporating elements is reviewed. Methods to design and prepare metal sulfide‐based composites by building binary or ternary heterojunctions of metal sulfide/semiconductor/conductor are also discussed in detail. These materials are used in energy conversion and environmental purification systems, where they act as photocatalytic materials not only to split water, reduce carbon dioxide or nitrogen, but also to degrade pollutants (organic and inorganic) in water and gas. Finally, it is concluded by summarizing the research frontiers of metal sulfide nanomaterials in energy and environmental applications, as well as proposing potential challenges and future research directions. This work may contribute to a better understanding of metal sulfide nanocomposites and provide clues for the fabrication of more efficient metal sulfide‐based nanostructures for clean energy production and environmental remediation.

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Microwave synthesis of metal-doped ZnS photocatalysts and applications on degrading 4-chlorophenol using heterogeneous photocatalytic ozonation process

Cited by 35 publications

References 63 publications

Role of Bi3+ ions on structural, optical, photoluminescence and electrical performance of Cd0.9-xZn0.1BixS QDs

Role of Bi3+ ions on structural, optical, photoluminescence and electrical performance of Cd0.9-xZn0.1BixS QDs

Photocatalytic Hydrogen Evolution from Water Splitting Using Core-Shell Structured Cu/ZnS/COF Composites

Metal Sulfide‐Based Nanoarchitectures for Energetic and Environmental Applications

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