| The global climate and environment have been seriously changed because of the great consumption of fossiol energy and the accompanying greenhouse gas emission. It is indispensable to construct clean energy systems in order to solve the issues, so utilization of sustainable energy has been addressed as importamt development strategy by goverments in many countries. Among the kinds of energy forms, solar energy is the most admired one. Hydrogen energy, has been therefore considered as the best carrier of green energy through a conversion from solar energy to chemical energy, mainly due to its high combustion heat, safety and environmental benefit.Herein, we tried to introduce semiconductor photocatalysts into MOFs to synthesize the semiconductor-MOFs heterostructures. Compared with semiconductor photocatalysts, the obtained products show great advantages. Therefore, the MIL-125(Ti) could exhibit photocatalysis activities throuth a dye-sensitized process. The main contents of the present research are as follows:(1) MIL-101(Cr) and MIL-125(Ti) were decorated with ZnIn2S4and CdS nanocrystals through solvothermal processes. The obtained composite ZnIm2S4/MIL-101possess high surface areas, good chemical durabilities and thermostabilities. However, the other obtained composites, ZnIn2S4/MIL-125and CdS/MIL-125, which lost their MOFs structure during the synthetic process had shown great visible-light photocatalytic hydrogen production activities. The photocatalytic efficiency of obtained composite ZnIn2S4/MIL-125had achieved6times of ZnIn2S4, and composite CdS/MIL-125had achieved2times of CdS. An increase of2times was achieved on ZnIn2S4decorated MIL-101(Cr). The enhancement of the photocatalytic activity of ZnImS4after MOFs hybridization can be attributed to the fact that MIL-101(Cr) could sensitize ZnIn2S4under visible light irradiation. Besides, MIL-101(Cr) has a large specific surface area which allows effective dispersion of embedded CdS particles;(2) MIL-125(Ti) showed great photocatalytic hydregon production activity on water splitting by using TEOA as sicrificial reagent, when loaded with Pt and sensitized by Rhodamine B dye. Although the photocatalytic efficiency of MIL-125(Ti) has reached72.8μmol/g·h when sensitized by Rhodamine B dye, the obtained Pt/MIL-125(Ti) shows enhanced hydrogen production ability in the same condition, which is106.4μmol/g·h. |
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