Iron(III) phosphate dihydrate
Iron(III) phosphate dihydrate
CAS: 13463-10-0
Molecular Formula: FeH4O6P
Iron(III) phosphate dihydrate - Names and Identifiers
Iron(III) phosphate dihydrate - Physico-chemical Properties
| Molecular Formula | FeH4O6P |
| Molar Mass | 186.85 |
| Appearance | Powder |
| Color | off-white |
| Physical and Chemical Properties | Appearance and properties: white, off-white peach blossom monoclinic crystal or powder |
Iron(III) phosphate dihydrate - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. |
| WGK Germany | 3 |
Iron(III) phosphate dihydrate - Nature
| Ksp precipitation equilibrium constant | pKsp: 15 |
Last Update：2024-04-10 22:29:15
Iron(III) phosphate dihydrate - Uses and synthesis methods
Overview
Ferric Phosphate is also known as iron phosphate and iron orthophosphate. A salt produced by the action of iron salt solution and phosphoric acid solution is a white, off-white monoclinic crystal powder. Among them, iron is trivalent iron, mostly dihydrate. The initial applications of iron phosphate compounds were mainly in the fields of ceramic glass, agriculture, steel and surface passivation. Later research found that because of its rich chemical structure, it has important applications in the fields of catalysis and lithium battery electrode materials. In addition, iron phosphate also has a rich skeleton structure, which can be used to synthesize microporous iron phosphate materials with an open skeleton structure.
physical and chemical properties
Appearance and properties: white, off-white peach blossom monoclinic crystal or powder
boiling point: 158°C at 760mmHg
Storage conditions: low temperature, ventilated, dry, light-proof, separate from oxidant
Vapor pressure: 1.41mmHg at 25°C
Preparation method
1. Precipitation:
synthesis from divalent iron source: weigh ferrous sulfate and phosphoric acid in the amount of other substances, prepare a solution with distilled water, control the reaction temperature to 70 ℃, add excess hydrogen peroxide, adjust the pH to 1.5 with ammonia water, filter, wash and dry at 80 ℃ for 15 min to obtain FePO4 • xH2O product.
synthesis with trivalent iron source: weigh iron nitrate and ammonium dihydrogen phosphate in the amount of other substances, control the temperature to 70 ℃ after preparing the solution, adjust the pH to 1.5 with ammonia water, filter, wash and dry at 80 ℃ for 15min to obtain the product.
2. Hydrothermal method:
synthesis from divalent iron source: weigh ferrous sulfate and phosphoric acid in the amount of other substances, prepare a solution with distilled water, control the reaction temperature to 70 ℃, add excess hydrogen peroxide, produce a large amount of light yellow precipitate, adjust the pH to 1.5 with ammonia water, and transfer to a hydrothermal kettle after 15 min of reaction at 120 ℃, 150 ℃ and 180 ℃ respectively, after 6h of hydrothermal reaction, filtration, washing and drying at 80 ℃ are carried out to obtain the product. In addition, at 150 ℃, the time was controlled at 2h, 6h and 10h respectively, and the product was obtained according to the same method.
synthesis from trivalent iron source: weigh iron nitrate and ammonium dihydrogen phosphate in the amount of other substances, prepare a solution with distilled water, control the reaction temperature to 70 ℃, adjust the pH to 1.5 with ammonia water, transfer to a hydrothermal kettle after 15min, react at 120 ℃, 150 ℃ and 180 ℃ for 6h respectively, filter, wash and dry at 80 ℃ to obtain the product.
3. Add wet-process phosphoric acid and ferrous sulfate to a three-mouth flask in a constant temperature water bath at the same time, control the stirring rate, maintain a certain reaction temperature and reaction time, add excess hydrogen peroxide, adjust the pH with ammonia water until a large amount of white precipitate appears, stir, settle and cool to room temperature, filter, dry after washing, and obtain light yellow iron phosphate powder. The equation is as follows:
2H3PO4 2FeSO4 H2O2→2FePO4↓ 2H2SO4 2H2O
application of properties
1. It can be used as a selective catalyst. Microporous and mesoporous nano-iron phosphate have an open pore structure and a larger specific surface, thereby increasing the catalytic position and facilitating the selective catalysis of organic macromolecules.
2. Iron phosphate is one of the few snail-killing agents approved for use in organic agriculture, and it is non-toxic to wild animals.
3. It can be used as a coating and has anti-rust effect.
4. Iron phosphate can be used as an electrode material for lithium batteries or as a precursor for synthetic lithium battery electrode material LiFePO4.
Main References
1. Zhou Weijia et al. Research progress of iron phosphate [J]. Chemical Technology Market, 2008,31(9):7-10.
2. He Gang et al.. Effect of the morphology of iron phosphate precursor on the electrochemical performance of lithium iron phosphate [J]. Journal of Artificial Crystals, 2013(12):2548-2555.
3. Ding Yigang, Li Pengtao, Liu Dong, etc. Preparation of wet-process phosphoric acid of iron phosphate and its effect on the properties of synthesized lithium iron phosphate [J]. Journal of Wuhan Engineering University, 2014, 36(1):1-4.
Last Update：2024-04-10 22:29:15
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