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

Abstract

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.

2D Ductile Transition Metal Chalcogenides (TMCs): Novel High‐Performance Ag2S Nanosheets for Ultrafast Photonics

“…Moreover, the nonlinear optical properties of these nanomaterials need to be further understood, which obviously hinders their application in practical micro‐optoelectronic devices. Therefore, identifying promising new 2D nanomaterials, especially TMCs with 2D structure, remains a goal that needs our joint efforts 22,23. Based on the above analysis, 2D TMCs have some outstanding characteristics that other 2D materials can't replace, so it is particularly important to further study TMCs 24…”

Carbon Quantum Dots (CQDs) Decorated Bi2O3-x Hybrid Photocatalysts with Promising NIR-Light-Driven Photodegradation Activity for AO7

“…To clarify the photocatalytic mechanism, the active species involved in the photocatalytic degradation process were evaluated by trapping experiments [60,61]. Figure 11a shows the effect of AgNO 3 (scavenger for electrons; e − ), ethanol (scavenger for hydroxyl radicals; •OH), EDTA (scavenger for holes; h + ), KI (scavenger for hydroxyl radicals and holes) and N 2 purging on the AO7 degradation over the 15C/3R-Bi 2 O 3-x sample under simulated sunlight irradiation.…”

High Quality Factor, High Sensitivity Metamaterial Graphene—Perfect Absorber Based on Critical Coupling Theory and Impedance Matching

“…Meanwhile, the ability of metamaterial absorbers to enhance absorption in the microwave, infrared, visible, and solar systems has also been demonstrated. Metamaterials have great potential in the control of light polarization, phase, and amplitude, which can be applied in optoelectronics, photonics, and photocatalysis [8][9][10][11][12][13][14][15][16][17][18][19]. Due to its super control of light, some new components can be developed, such as broadband circular polarizer, new perfect absorber and so on.…”