Insight into the efficient photocatalytic removal mechanism of organic pollutants by plasmonic Z-scheme MoS2/Ag/Ag3VO4 heterojunction under visible light

Preparation of Ag/CdS/MIL‐101(Cr) Composite by Dual Solvent Method and Its Photocatalytic Hydrogen Production

“…[25] Figure 5c shows the high-resolution spectral of Ag 3d of the catalyst, which is divided into two peaks at 373.9 eV and 367.9 eV, corresponding to the spin orbits of Ag 3d 3/2 and Ag 3d 5/2 , indicating that Ag exists in the prepared sample. [43,44] Figure 5d shows the characteristic peaks of Cd 3d 5/2 and Cd 3d 3/2 in Cd 3d,which are at 404.9 eV and 411.7 eV, respectively, and the binding energy between the two characteristic spin orbit components is 6.8 eV, which proves that Cd exists in Cd 2 + state. [45,46] The high-resolution spectra in Figure 5a and 5d confirm that Cd and S are in the sample in the form of CdS.…”

“…The specific surface area and porosity of the samples were tested by the N 2 adsorption-desorption technique. MIL-101(Cr) and composite materials all exhibit H4-type hysteresis loop IV type isotherms, [43] indicating that mesopores exist in these three materials(Figure 6a and b). Compared with MIL-101(Cr), the surface area and pore volume of the sample gradually decrease after CdS and Ag are sequentially compounded.…”

“…[45,46] When Ag, CdS and MIL-101(Cr) are recombined, Ag/CdS/MIL-101(Cr)-0.6 shows a higher photocurrent density, indicating that the localized surface plasmon resonance effect of the noble metal Ag effectively increases the electrons and holes separation efficiency of CdS/MIL-101(Cr)-0.4. [43,51] Under visible light irradiation, the hydrogen production rate of MIL-101(Cr) and its composite materials was measured. Without photocatalyst, H 2 escape was not detected under visible light illumination of the above mixed solution.…”

Molybdenum Disulfide-Based Nanomaterials for Visible-Light-Induced Photocatalysis

“…Güy et al reported the photocatalytic reduction of 4-nitroaniline to p -phenylendiamine with up to 90% yield using a MoS 2 /Ag/Ag 3 VO 4 nanocomposite under irradiation of visible light. 13 They reported that, upon irradiation, the photogenerated e – in the CB of Ag 3 VO 4 were transferred to the VB of MoS 2 , and photogenerated e – in the CB of MoS 2 caused a rapid reduction of the 4-nitroaniline because of the migration of e – from the photocatalyst surface to the 4-nitroaniline. Regarding the reusability of the prepared material, the reduction yield slightly reduced from 90% to 86% after five cycles.…”

“…Some major uses of MoS 2 include the photocatalytic evolution of hydrogen, 9 , 10 oxidative desulfurization, 11 and the photocatalytic degradation of organic pollutants. 12 , 13 With its hexagonal arrangement of Mo and S atoms, one- or few-layered MoS 2 has been considered analogous to graphene; 14 however, MoS 2 possesses a narrower band gap than graphene, which enables the generation of electron/hole pairs (e – /h + ) upon visible-light excitation and makes MoS 2 a strong candidate for visible-light-induced photocatalysis. MoS 2 has attracted considerable attention for photocatalysis because of its excellent ability to absorb light and high chemical stability.…”