Titanate nanofibers sensitized with ZnS and Ag2S nanoparticles as novel photocatalysts for phenol removal

Barrocas, B.; Entradas, T.J.; Nunes, Carla D.; Monteiro, Olinda C.

doi:10.1016/j.apcatb.2017.06.089

Cited by 50 publications

(23 citation statements)

References 39 publications

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“…By fitting the O 1s binding energy, two peaks at 529.3 and 531.1 eV are found. The signal at 529.3 eV is assigned to the lattice oxygen, while the peak at 531.1 eV is mainly attributed to the surface vacancies and the chemisorbed oxygen [21,62]. On the Ag 3d spectrum (Figure 3d), the peak at 368.4 eV is assigned to Ag 3d 5/2 , and the peak at 374.3 eV is attributed to Ag 3d 3/2 of Ag + [68].…”

Section: Resultsmentioning

confidence: 99%

“…This makes it an important visible-light-driven photocatalytic material [57,58]. Particularly, Ag 2 S has been most frequently used as an ideal co-catalyst, combined with other semiconductors, to form heterojunction composites with improved catalytic activity [59,60,61,62]. Moreover, the construction of heterostructures can significantly decrease the photocorrosion of Ag 2 S. It is noted that bare Ag 2 S could easily undergo photocorrosion, due to the reduction of the lattice Ag + into metal Ag, caused by photogenerated electrons.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic and Photo-Fenton Catalytic Degradation Activities of Z-Scheme Ag2S/BiFeO3 Heterojunction Composites under Visible-Light Irradiation

et al. 2019

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Z-scheme Ag2S/BiFeO3 heterojunction composites were successfully prepared through a precipitation method. The morphology and microstructure characterization demonstrate that Ag2S nanoparticles (30–50 nm) are well-decorated on the surfaces of polyhedral BiFeO3 particles (500–800 nm) to form Ag2S/BiFeO3 heterojunctions. The photocatalytic and photo-Fenton catalytic activities of the as-derived Ag2S/BiFeO3 heterojunction composites were evaluated by the degradation of methyl orange (MO) under visible-light irradiation. The photocatalytic result indicates that the Ag2S/BiFeO3 composites exhibit much improved photocatalytic activities when compared with bare Ag2S and BiFeO3. The optimum composite sample was observed to be 15% Ag2S/BiFeO3 with an Ag2S mass fraction of 15%. Furthermore, the addition of H2O2 can further enhance the dye degradation efficiency, which is due to the synergistic effects of photo- and Fenton catalysis. The results of photoelectrochemical and photoluminescence measurements suggest a greater separation of the photoexcited electron/hole pairs in the Ag2S/BiFeO3 composites. According to the active species trapping experiments, the photocatalytic and photo-Fenton catalytic mechanisms of the Ag2S/BiFeO3 composites were proposed and discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalytic and Photo-Fenton Catalytic Degradation Activities of Z-Scheme Ag2S/BiFeO3 Heterojunction Composites under Visible-Light Irradiation

et al. 2019

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“…Due to the efficient charge separation and transfer process, the p–n heterojunction system showed 15 times higher catalytic performance than pure CuGaS 2 under visible light. Ag 2 S and TiO 2 are also good semiconductor candidates to form heterojunctions with ZnS, where the suitable band alignment favors effective charge separations.…”

Section: Applicationsmentioning

confidence: 99%

Design Principles and Material Engineering of ZnS for Optoelectronic Devices and Catalysis

Liu

Chen

et al. 2018

Adv Funct Materials

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ZnS, as one of the first semiconductors discovered and a rising material star, has embraced exciting breakthroughs in the past few years. To shed light on the design principles and engineering techniques of ZnS for improved/novel optoelectronic properties, the fundamental mechanisms and commonly employed strategies are proposed in this review. Recent progress on modifications of ZnS allows it to be extensively and effectively used in versatile applications, including transparent conductors, UV photodetectors, luminescent devices, and catalysis, which are clearly and comprehensively summarized in this work. Novel functional devices springing up from the newly developed ZnS-based materials are highlighted as well. This review not only provides a scientific insight into the advances of ZnS-based materials, but also touches on the future opportunities in this inspiring field.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.201802029. relatively high charge recombination rate and low charge transport process inhibit the optoelectronic properties of ZnS as a high-performance photodetector. As a window layer of optoelectronic devices, a lack of high electrical conductivity typically hinders the practical use of ZnS in solar cells, photodiodes, light-emitting devices, etc. As a photocatalyst, the transparency of ZnS becomes a drawback as it suffers from a poor utilization of sunlight.There is not a perfect material, but the potential of developing a material is beyond limitation. The past few years have witnessed extensive designing and engineering of ZnS to explore its potentials in specific applications. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] This review summarizes the recent breakthroughs on ZnS-based materials as excellent candidates in optoelectronic devices, photocatalysis, and other novel functional devices. More importantly, it sheds light on the design principles and fundamental mechanisms of the improved performance of ZnS through strategies such as developing novel nanostructures, bandgap engineering, alloying with other materials, etc. To the best of our knowledge, it is the first comprehensive review on the design principles and material engineering of ZnS for novel/improved properties and intended applications. Briefly, current literature on a variety of ZnS-based structures was first summarized, ranging from 0D to 2D nanostructures. Then, the representative applications of ZnS-based materials are described, which are mainly consisted of four parts, as shown in Figure 1: transparent conductors, UV photodetectors, luminescent devices, and catalysis. Each part contains the latest design strategies of ZnS for the intended applications, fabrication techniques, representative examples, and the state-of-the-art devices. Finally, it outlines the challenges and opportunities in each field. In particular, we provide our perspectives on the future research directions of ZnS in energy and environment.

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“…In recent studies, metal oxide and sulfide semiconducting materials have attracted tremendous amount of research interest owing to their tunable optical, electrical and catalytic properties that have various potential applications in energy, environmental and catalysis (21)(22)(23). Among the semiconductors, silver sulfide nanoparticles have received great attention owing to its high chemical stability, good optical properties with direct tunable band gap in the range of 0.9-1.5 eV and the large absorption coefficient of approximately 10 4 m −1 , making it suitable for photovoltaic and photocatalytic applications (23)(24)(25)(26)(27)(28).…”

Section: Introductionmentioning

confidence: 99%

Continuous Flow Reactor for the Controlled Synthesis and Inline Photocatalysis of Antibacterial Ag₂S Nanoparticles

Prakash

Katoch

Shah

et al. 2020

Photochem & Photobiology

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The present study is focused on the integration of microreactors to synthesize visible light active nanophotocatalysts for inline photocatalytic degradation of organic dye and antibacterial activity. A wire‐assisted and a rapid laser micromachining technique has been employed for the fabrication of polydimethylsiloxane (PDMS) and poly(methyl methacrylate) (PMMA)‐based microreactors, respectively. By varying the design and chemical reagents involved, different sizes of visible light active Ag2S nanoparticles were prepared via a continuous microfluidics approach using fabricated microreactors. When polyvinylpyrrolidone (PVP) was utilized as the capping agent during the reaction, smaller particles of the size of ~ 15 nm were observed. The photocatalytic performance of these nanoparticles has been evaluated inline by employing the single‐inlet planar microreactor as a function of flow rate and channel length. The photocatalyst durability test and a comparative photocatalytic efficiency study between the microreactor and the conventional beaker reactor have also been carried out. Under visible light, these nanoparticles exhibit a remarkable enhancement of ~ 94.5% in the inline microreactor‐based photocatalytic degradation of methylene blue dye. The slower the flow rate and longer the channel length, gradual enhancement in the performance has been observed. Also, these nanoparticles express an antibacterial effect with very high efficacy even at very low (2 mg mL−1) concentration toward the inhibition of Escherichia Coli.

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Titanate nanofibers sensitized with ZnS and Ag2S nanoparticles as novel photocatalysts for phenol removal

Cited by 50 publications

References 39 publications

Photocatalytic and Photo-Fenton Catalytic Degradation Activities of Z-Scheme Ag2S/BiFeO3 Heterojunction Composites under Visible-Light Irradiation

Photocatalytic and Photo-Fenton Catalytic Degradation Activities of Z-Scheme Ag2S/BiFeO3 Heterojunction Composites under Visible-Light Irradiation

Design Principles and Material Engineering of ZnS for Optoelectronic Devices and Catalysis

Continuous Flow Reactor for the Controlled Synthesis and Inline Photocatalysis of Antibacterial Ag₂S Nanoparticles

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Titanate nanofibers sensitized with ZnS and Ag2S nanoparticles as novel photocatalysts for phenol removal

Cited by 50 publications

References 39 publications

Photocatalytic and Photo-Fenton Catalytic Degradation Activities of Z-Scheme Ag2S/BiFeO3 Heterojunction Composites under Visible-Light Irradiation

Photocatalytic and Photo-Fenton Catalytic Degradation Activities of Z-Scheme Ag2S/BiFeO3 Heterojunction Composites under Visible-Light Irradiation

Design Principles and Material Engineering of ZnS for Optoelectronic Devices and Catalysis

Continuous Flow Reactor for the Controlled Synthesis and Inline Photocatalysis of Antibacterial Ag2S Nanoparticles

Contact Info

Product

Resources

About

Continuous Flow Reactor for the Controlled Synthesis and Inline Photocatalysis of Antibacterial Ag₂S Nanoparticles