Preparation and photocatalytic activity of graphene-modified Ag<sub>2</sub>S composite

Hu, Wenda; Zhao, Leihong; Zhang, Yuting; Zhang, Xin; Dong, Lvzhuo; Wang, Sisi; He, Yiming

doi:10.1080/17458080.2015.1077533

Cited by 15 publications

(5 citation statements)

References 34 publications

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“…It is found that the 2.4% CNT/Ag 2 S composite exhibits the highest apparent first-order reaction rate constant, k app , which is about 5.9 times higher than that for bare Ag 2 S nanoparticles. Compared with graphene-modified Ag 2 S, the visible-light-driven photocatalytic activity Ag 2 S can be much improved by the decoration of CNT [32].…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, for the bare Ag 2 S, the high recombination rate of photogenerated electron-hole (e − -h + ) pairs restricts its photocatalytic efficiency. As a result, many routes have been used to enhance the photocatalytic activity of Ag 2 S [28,29,30,31,32,33].…”

Section: Introductionmentioning

confidence: 99%

“…Carbon nanomaterials (e.g., carbon quantum dots (CQDs), carbon nanotubes (CNTs) and graphene) and noble metal nanoparticles (NPs) have a variety of intriguing physicochemical properties and offer a wide scope of technological applications in electronic devices, biomedicine, sensors, and wave absorption [34,35,36,37,38,39,40,41]. Moreover, due to their good carrier transport property, interesting photoluminescence (PL) up-conversion effect and localized surface plasmon resonance (LSPR) effect [42,43], these nanomaterials can also be used as excellent modifiers or co-catalysts to enhance the photocatalytic performances of semiconductor photocatalysts [31,32,33,44,45,46,47,48,49,50,51]. CNT can be assumed by folding single-layered graphene seamlessly into a 1D tubular structure.…”

Section: Introductionmentioning

confidence: 99%

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Facile Preparation of CNT/Ag2S Nanocomposites with Improved Visible and NIR Light Photocatalytic Degradation Activity and Their Catalytic Mechanism

Tang

Sun

et al. 2019

Micromachines

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In this work, a series of carbon nanotubes (CNT)/Ag2S hybrid nanocomposites were successfully prepared by a facile precipitation method. Transmission electron microscope (TEM) observation indicates that Ag2S nanoparticles with an average particle size of ~25 nm are uniformly anchored on the surface of CNT. The photocatalytic activities of the CNT/Ag2S nanocomposites were investigated toward the degradation of rhodamine B (RhB) under visible and near-infrared (NIR) light irradiation. It is shown that the nanocomposites exhibit obviously enhanced visible and NIR light photocatalytic activities compared with bare Ag2S nanoparticles. Moreover, the recycling photocatalytic experiment demonstrates that the CNT/Ag2S nanocomposites possess excellent photocatalytic stability. The photoelectrochemical and photoluminescence measurements reveal the efficient separation of photogenerated charges in the CNT/Ag2S nanocomposites. This is the dominant reason behind the improvement of the photocatalytic activity. Based on active species trapping experiments, the possible photocatalytic mechanism of CNT/Ag2S nanocomposites for dye degradation under visible and NIR light irradiation was proposed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Facile Preparation of CNT/Ag2S Nanocomposites with Improved Visible and NIR Light Photocatalytic Degradation Activity and Their Catalytic Mechanism

Tang

Sun

et al. 2019

Micromachines

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“…Similarly, for Ag 2 S/graphene, it was found that the performance of the photocatalyst depended on the relative amounts of semiconductor and graphene in the nanostructure. The authors have investigated samples with distinct graphene content (wt%: 2, 4, and 6), showing that in those conditions, the photodegradation of RhB, occurred most efficiently under visible-light irradiation in the presence of the sample 4 wt% in graphene [146].…”

Section: Application Of Carbon-based Semiconductor Nanostructures In ...mentioning

confidence: 99%

Nanomaterials of Carbon and Metal Sulfides in Photocatalysis

Estrada¹,

Lopes²,

Trindade³

2023

Photocatalysts - New Perspectives

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Heterogeneous semiconductor photocatalysis has received much interest because of its applications in important global energy and environmental challenges in a cost-effective sustainable way. The photocatalytic efficiency of semiconductor photocatalysts under solar irradiation has been pointed out by difficulties associated with low visible-light absorption range, fast recombination of photogenerated carriers, and low chemical stability in operational conditions. Graphitic materials have attracted great interest due to properties, such as high surface area, mechanical strength, and photochemical stability. Thus, their combination with metal sulfides, has been explored as promising strategies to produce new photocatalysts. These nanocomposites show great potential in photodegradation of contaminants of emerging concern (CEC), which might be detected in water sources, such as traces of Pharmaceutics and pesticides. Here, we briefly review fundamental principles photocatalysis in general, with the focus on the use of carbon-nanomaterials of distinct structural dimensionalities associated with nanocrystalline metal sulfides, envisaging their application as heterogeneous photocatalysts for water remediation. Key aspects concerning the photocatalyst properties, such as light absorption, charge separation and transfer, and stability, are also approached. Graphene and graphene derivatives have demonstrated great potential for increasing photogenerated charge-carrier separation and migration efficiency, as well as in extending the light absorption range and adsorption capacity.

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“…Silver sulphide (Ag 2 S) is another semiconductor that has shown promising photocatalytic activity [ 12 ]. However, Ag 2 S alone is not efficient for the degradation of pollutants, and in addition it has a relatively high cost [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel BiOCl Based Nanocomposite Membrane for Water Desalination

Akbarzadeh

Ndungu

2022

Membranes

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In this study, BiOCl based nanocomposites were used as photocatalytic membranes for a simulated study on water desalination in reverse osmosis membrane systems. Through molecular dynamic simulation, the molecular structure of BiOCl, BiOCl/Ag2S and BiOCl/Bi2O3 heterojunctions were designed and their electronic properties, mechanical properties, and membrane performance for water desalination were evaluated for the first time. The molecular structure was created, and a geometry optimization task was used to optimize it. Material Studio 2019 CASTEP was used for simulation of the electronic and mechanical properties and water desalination was performed by ReaxFF software under pressures between 0 and 250 MPa. The novel BiOCl based nanocomposites showed improved electronic and mechanical properties and, most importantly, improvements in salt rejection and water permeability as compared to well-known materials such as graphene and MoS2. BiOCl and BiOCl/Ag2S had a bandgap around two, which is the ideal bandgap for semiconductor photocatalysts. A salt rejection of 98% was achieved under an applied pressure of 10 MPa. Salt rejection was higher for BiOCl/Bi2O3, while water permeability was higher for BiOCl/Ag2S. The monolayer BiOCl was unstable under pressures higher than 50 MPa, but the mechanical stability of BiOCl/Ag2S increased twofold and increased fourfold for BiOCl/Bi2O3, which is even higher than MoS2. However, between the three nanocomposites, BiOCl/Ag2S was found to be the most ideal photocatalytic nanocomposite membrane.

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Preparation and photocatalytic activity of graphene-modified Ag₂S composite

Cited by 15 publications

References 34 publications

Facile Preparation of CNT/Ag2S Nanocomposites with Improved Visible and NIR Light Photocatalytic Degradation Activity and Their Catalytic Mechanism

Facile Preparation of CNT/Ag2S Nanocomposites with Improved Visible and NIR Light Photocatalytic Degradation Activity and Their Catalytic Mechanism

Nanomaterials of Carbon and Metal Sulfides in Photocatalysis

A Novel BiOCl Based Nanocomposite Membrane for Water Desalination

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Preparation and photocatalytic activity of graphene-modified Ag2S composite

Cited by 15 publications

References 34 publications

Facile Preparation of CNT/Ag2S Nanocomposites with Improved Visible and NIR Light Photocatalytic Degradation Activity and Their Catalytic Mechanism

Facile Preparation of CNT/Ag2S Nanocomposites with Improved Visible and NIR Light Photocatalytic Degradation Activity and Their Catalytic Mechanism

Nanomaterials of Carbon and Metal Sulfides in Photocatalysis

A Novel BiOCl Based Nanocomposite Membrane for Water Desalination

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Preparation and photocatalytic activity of graphene-modified Ag₂S composite