Method for preparing manganese phosphate material

Abstract

The invention belongs to the technical field of compound preparation, and particularly relates to a method for preparing a manganese phosphate material. The method is characterized in that: the method can synthesize a large amount of single or doped hureaulite type phosphate and manganese phosphate monohydrate (MnPO4.H2O) with good crystallinity at one time under a normal-pressure heating reflux condition. The method comprises the following steps of: preparing Mn5(HPO4)2(PO4)2(H2O) with reflux by adopting mixed solution of bivalent manganese salt and soluble phosphate or dihydric phosphate or phosphoric acid and controlling pH, temperature and time; preparing Mn5-xMx(HPO4)2(PO4)2(H2O) with reflux by mixing other soluble bivalent transition metal salt into the bivalent manganese salt and controlling pH, temperature and time, wherein M is Co, Fe, Ni, Cu and Zn and the like and x is more than or equal to 0 and less than 5.0; and preparing MnPO4.H2O with reflux reaction by adopting mixed solution of bivalent manganese salt and soluble phosphate or dihydric phosphate or phosphoric acid, adding NaClO solution and controlling solution acidity, temperature to be 40 to 100 DEG C and time for 1 hour to 7 days. The method has the advantages of mild, simple and easily controlled conditions, low energy consumption, low pollution and high single yield, and can be used for preparation of optics, magnetics, catalysts and chemical power supply materials.

Description

technical field [0001] The invention relates to a preparation method of manganese phosphate material. Described manganese phosphate is single or doped phosphatite type phosphate and manganese phosphate monohydrate (MnPO 4 ·H 2 O). The present invention is particularly suitable for synthesizing well-crystallized single or doped strengite-type phosphate or manganese phosphate monohydrate (MnPO 4 ·H 2 O), so that a large amount of metal phosphates can be synthesized at one time under simple conditions, which belongs to the inorganic preparation method of phosphate functional materials. Background technique [0002] Transition metal phosphate pore structure compounds have rich structural chemical characteristics and excellent physical and chemical properties, showing good application prospects in the field of modern industry, and are one of the hotspots of international advanced materials research. Phosphatite structural metal phosphate has the advantages of good thermal st...

AI Technical Summary

Problems solved by technology

The synthesis of manganese phosphate monohydrate by the reaction of trivalent manganese nitrate and phosphoric acid is complicated, and trivalent manganese nitrate must first be prepared; high-temperature pyrolysis of divalent manganese oxalate is used to obtain Mn 3 o 4 , then Mn 3 o 4 、H 3 PO 4 Manganese phosphate monohydrate (Lightfoot P, Cheetham A K, Sleight A W. Inorganic Chemistry, 1987, 26, 3544-3541) can be prepared by reacting at 200°C for 3 days. The process is complex and simple The amount of secondary products is small, and high temperature and high pressure consume a lot of energy; MnPO is synthesized by hydrothermal reaction at 150°C for 12 or 24 hours with manganese nitrate hexahydrate and sodium phosphate dodecahydrate acidic solution 4 ·H 2 O, the reaction must be carried out in an autoclave, and produce toxic gas NO (Xia Hongyu et al., Journal of Synthetic Crystals, 2008, 37, 587-591; Zhang Y G, Liu Y, Fu S Q, et al.Bulletin of the Chemical Society of Japan, 2006, 79:270-275); it has recently been reported that MnPO was precipitated after the reaction of manganese nitrate and phosphoric acid in water-ethanol solution at 40°C 4 ·H 2 A new method for O precipitation, however, to generate a large amount of the target product at a time, there will still be toxic gas NO x Generation (Boonchom B, Youngme S, Maensiri S, et al. Journal of Alloys and Compounds, 2008, 454:78-82)

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