Hydrothermal Syntheses and Effect Factors of Nickel Phosphates with Open-frameworks

Under hydrothermal synthetic conditions and from 1NiCl2·6H2O-mH3PO4-nNH4FpNH3·H2O-40H2O(n=0, 3) system, we synthesized five kinds of materials containing microporous VSB-1 and VSB-5 with 24 member rings, microporous sample A Ni12(HPO4)6(PO4)2(OH)6 with 12 member rings, layered structural sample B NH4NiPO4·H2O, and microporous sample C (C2H10N2)[Ni(H2O)6](HPO4)2 with 8 member rings linked by hydrogen bonds. They were characterized by XRD, FT-IR and TG. The effect factors of raw materials, pH, Ni/P ratio, template agents, and mineralization agent on synthetic products were investigated. The phase maps were also provided. The effect factors of pH, Ni/P ratio, and mineralization agent play important roles in the synthetic processes. It is important that we synthesized VSB-1 without F ions.