Photocatalytic activity of layered MoS₂ in the reductive degradation of bromophenol blue

Abstract

Molybdenum disulphide (MoS2) is a layered material with interesting photocatalytic properties.

Synthesis and Crystal Structures of Bis(diallydithiocarbamato)zinc(II) and Silver(I) Complexes: Precursors for Zinc Sulfide and Silver Sulfide Nanophotocatalysts

“…The kinetics of photocatalytic degradation of BPB and BTB by the ZnS and Ag 2 S nanoparticles has been described using the Langmuir–Hinshelwood model. , Figure shows the plot of ln­(C t /C 0 ) over irradiation time for BTB and BPB dye degradation in the presence of ZnS and Ag 2 S nanoparticles. The photocatalytic degradation of BTB and BPB follows a pseudo-first-order kinetic model, and the rate constants ( k /min) with their corresponding correlation coefficients ( R 2 ) calculated from the plots are presented in Table .…”

“…5 mL aliquots of the sample were collected at 30 min intervals and filtered, and the filtrate was taken for absorption analysis. Equation was used to calculate the degradation efficiency D = C 0 .25em − .25em C t C 0 × 100 where D is degradation efficiency and C 0 and C t are the initial and final concentrations of BTB and BPB solutions, respectively. The reusability and stability of the catalysts were evaluated by recycling them four times.…”

Bi-functional role of high charge mobility with 2D/2D interactions for effective PEC and visible photocatalysis in NiO/MoS2 nanocomposites

“…The removal of dye during four cycles is 89.9%. [55][56][57][58][59][60][61] The degradation of colorless pollutant phenol was performed using 15.0% NiO/MoS 2 nanocomposite in order to eliminate the doubts of self-degradation and photosensitization. The degradation of phenol was performed for 5 h. The 15.0% NiO/MoS 2 nanocomposite degraded 64.0% phenol.…”

“…The internal electric field ultimately forces the photogenerated electrons from the CB of MoS 2 and the holes from the VB of NiO with weak redox potentials to recombine at the interface, leaving behind the preserved powerful electrons in the CB of NiO and holes in the VB of MoS 2 to perform the reduction and oxidation reactions, respectively. 57,58…”

Modelling the structural disorder in trigonal-prismatic coordinated transition metal dichalcogenides

“…Spectroscopy and microscopy techniques are exploited for the characterization of multilayer TMDCs, but several studies involving the careful analysis of diffraction patterns are also documented and give valuable and detailed information about the actual atomic arrangement of the investigated samples. We cite in particular (i) the early papers by Frindt and coworkers (Joensen et al, 1986(Joensen et al, , 1987Yang et al, 1991;Gordon et al, 2002), which report extended X-ray absorption fine structure experimental analyses and numerical simulations of the XRD patterns of single-layer, few-layer and restacked MoS 2 and WS 2 samples; and (ii) the atomic pair distribution function (PDF) analyses performed on MoS 2 and WS 2 by different groups over a wide time span (Petkov et al, 2000;Mangelsen et al, 2019;Bekx-Schu ¨rmann et al, 2020;Chithaiah et al, 2020;Kisała et al, 2022;Sreedhara et al, 2022). An overview of this literature shows that, depending on the preparation routes and the exploited experimental techniques, different atomic arrangements are described: (i) metastable octahedral coordination in monolayers, whereas the bulk specimens are trigonal-prismatic; (ii) fullerene-like or multiwalled nanotubes keeping the local sheet arrangement of planar structures; (iii) turbostratic stacking; (iv) zigzag chains of metal-metal bonds; (v) stacking faults.…”