Growing process of CdS nanoclusters in zeolite Y studied by positron annihilation

Preparation of Ru-loaded CdS/Al-HMS nanocomposites and production of hydrogen by photocatalytic degradation of formic acid

“…4f resulting from the quantum size effect of CdS nanoparticles incorporated in the channels of Al-HMS. The location of CdS nanoparticles inside zeolite hosts was confirmed by the blue-shifted phenomenon of diffuse reflectance UV-visible spectra [14]. The absorption edges of CdS/Al-HMS supported Ru are gradually blue-shifted from 516 nm to 467 nm and the toes of absorption bands are simultaneously uplifted with increase of ruthenium loading as shown from Fig.…”

New Insights into CdS Quantum Dots in Zeolite−Y

“…In the cases of [(CdS) 30 27 ]-Y 2.5 , the diffraction intensity of zeolite-Y at 6.2°decreased by 30% and 38%, respectively, during the 0.5 h period and by 52% and 72%, respectively, during the 1 h period ( Figure 9B). The decrease further continued to 85% and 87%, respectively, as the exposure time increased to 2 h. In the case of [(CdS) 30 The above results show that one has to be extremely careful with the handling of CdS-containing zeolites-Y produced by exposure of Cd 2+ -exchanged zeolites-Y to H 2 S if their surfaces are not coated afterward with ODC or if the zeolites do not simultaneously contain TEA + ions or other large organic cations within the supercages, since the frameworks are highly prone to collapse upon adsorption of moisture.…”

“…Jentys et al 24 even performed an ab initio calculation on the stability of [(CdS) 4 ] sod by adopting its geometry. Wang and co-workers 27 concluded that CdS QDs exist within the sodalite cages of zeolite-Y on the basis of a positron annihilation study. However, they produced CdS by stirring Cd 2+ -exchanged zeolite-Y in an aqueous solution of Na 2 S, despite the well-known fact that moisture sensitively affects the nature and size of CdS QD (vide infra), indicating that they prepared the samples inappropriately.…”

Visible light driven photocatalytic hydrogen evolution over CdS incorporated mesoporous silica derived from MCM-48

“…Semiconductor heterojunctions such as CdS/TiO 2 , CdS/ZnO, CdS/ZnS, and CdS/C 3 N 4 have been widely reported in photocatalysis due to the promoted separation of photo-generated charges at the interface [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56]. In addition, microporous and mesoporous silica could be used as support for dispersing CdS quantum dots [57][58][59][60][61][62][63][64][65][66][67][68]. A c c e p t e d M a n u s c r i p t…”