Synthesis Of Zinc-Base Composite Metal Hydroxide With Cross-Linked Structure And The Application Of The Material With Photocatalytic Performance

In the research of photocatalytic technology, ZnO is treated as a substitute of traditional photocatalyst materials TiO2 because of its low toxicity, large quantum yields, high chemical stability and so on. However, the quick recombination of e- and h+ pairs is the major limitation in achieving high photocatalytic efficiency.Doping metal elements into ZnO is an important method to inhibit electron-hole pairs'recombination and enhance the photocatalytic activity of ZnO. Because it can change the lattice structure of ZnO and increase the lattice defects. Layered double hydroxides (LDHs) can make mental elements dispersed completely, which provides a new idea to synthesis ZnO with the modification of mental elements.Hydrotalcite-like compound, also called Layered double hydroxides (LDHs), is a new kind of inorganic functional materials. It can be applied to the field of catalysis?adsorption?water treatment?photochemistry?biology and so on because of its high dispersion of mental elements and changeability of mental elements and the interlayer anions, alkalinity, and its memory effect. The performance of LDHs can be improved greatly by increasing their specific surface area while cross-linked structure is helpful to increase that.In this paper, we have synthesis the zinc-base composite metal hydroxide with cross-linked structure. By calcining this we obtained zinc-base composite metal oxides with cross-linked structure and the photocatalytic activity of the materials was tested. The detailed work is as follows:We have synthesized the microsphere-like ZnAl LDHs with cross-linked structure using microsphere-like alkaline zinc carbonate with cross-linked structure by adding aluminum and carbonate ions. The optimum reaction conditions were determined by regulating and controlling reaction conditions including the molar rate of Zn/Al, Ph of reaction system, temperature and so on. The reaction mechanism was explored. We calcined the ZnAl LDHs and obtained the zinc aluminum composite oxides with cross-linked structure and microsphere-like morphology. The photocatalytic activity of the materials was tested.We have synthesized the nest-like ZnNiAl LDHs with cross-linked structure using nest-like alkaline zinc nickel carbonate with cross-linked structure by adding aluminum and carbonate ions. The optimum reaction conditions were determined by regulating and controlling reaction conditions including the molar rate of Zn(Ni)/Al, Ph of reaction system, temperature and so on. We calcined the ZnNiAl LDHs and obtained the zinc nickel aluminum composite oxides with cross-linked structure and nest-like morphology. The photocatalytic activity of the materials was tested.