Cd1−xZnxS solid solutions supported on ordered mesoporous silica (SBA-15): Structural features and photocatalytic activity under visible light

Facile synthesis of uniform ZnxCd1−xS alloyed hollow nanospheres for improved photocatalytic activities

“…Recently, it has been reported that the formation of ternary crystals of Zn x Cd 1-x S (0 \ x \ 1) with well controlled light absorption, phase, optical properties and tunable bandgap can be realized by changing Zn mole fraction [17]. In contrast to CdS, the enlarged bandgap of Zn x Cd 1-x S solid solutions [18] give rise to an enhanced separation between the photo-generated electrons and holes resulting into the great enhancement in the photodecomposition towards organic species. Up to date, several synthetic routes have been developed to prepare Zn x Cd 1-x S photocatalysts, such as co-precipitation [19,20], chemical precipitation technique [21], successive ionic layer adsorption and reaction [22], solvothermal method [23], H 2 S gas thermal treatment [24], hydrothermal method [25] and chemical reduction route [26] et al To the best of our knowledge, there are few literatures reported about Zn x Cd 1-x S alloyed hollow nanospheres with enhanced photodegradation activities towards organic dyes.…”

Preparation and properties of CuO/Zn Cd1−S photocatalysts

“…The activities of Zn x Cd 1 À x S solid solutions are therefore much better than that of CdS, and the photocatalytic activity of Zn x Cd 1 À x S increases significantly with increasing amount of Zn ions. However, the band-gap increase also leads to a decrease in visible-light absorption, which is undesirable for photocatalytic reactions under visible light [15]. The degradation rate of MO over Zn 0.507 Cd 0.493 S is therefore lower than that over Zn 0.384 Cd 0.616 S. Fig.…”

“…Garaje et al [14] have shown a decreasing of photocatalytic degradation efficiency of organic dye from 98% to 78% although the band gap of Cd x Zn 1 À x S only has a small increase from 2.48 to 2.85 eV when the value of x in Cd x Zn 1 À x S increases from 0.1 to 0.5. Macías-Sánchez et al [15] have reported that the band gap increases from 2.15 to 2.23 eV, which causes the H 2 evolution amounts increasing from 520 μmol to 962 μmol, when the value of x in Cd x Zn 1 À x S/S15 increases from 0.1 to 0.2. But when the value of x increases from 0.2 to 0.3, the band gap only increases 0.02 eV, as a result, the H 2 evolution amounts decrease from 962 μmol to 800 μmol.…”

“…The photocatalytic activities of Zn x Cd 1 À x S are higher than that of CdS [14,15]. However, the reported photocatalytic activities are still low, and it is important to improve their photocatalytic properties by designing semiconductor composites to further suppress electron-hole pair recombination.…”

Water Splitting By Photocatalytic Reduction

“…At this end, research efforts should be directed at constructing 2D nanosheets and nanoporous structures of metal sulfide solid solutions [158,[162][163][164]. In addition, the surface areas of metal sulfide solid solutions can be enhanced by loading them into the porous materials such as microporous and mesoporous silicas [165][166][167]. …”