Abstract
ZnxCd1-xS/Zn–Al layered double hydroxide (LDH) precursor heterostructured composites were synthesized by a one-step mechanochemical method. X-ray diffraction, Fourier transform-infrared spectroscopy, SEM-EDS and thermogravimetric analysis confirmed the formation of the ZnxCd1-xS/Zn–Al LDH precursor composites. X-ray photoelectron spectroscopy indicated the formation of a heterojunction structure. The photocatalytic degradation activity for methyl orange of the heterostructured composites was observed even under visible light irradiation and exhibited a large enhancement with the increase in the molar ratio of sulfide solid solution to LDH as well as the increase in the ratio of Cd to Zn. A detailed investigation on the mechanism for the enhanced photocatalytic activity was performed, particularly regarding to the efficient separation of photogenerated electrons and holes with the heterostructure. This work provides a very simple and environment-friendly way to fabricate a series of heterostructured photocatalysts based on LDH precursor with transition metal sulfide well dispersed inside.
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