Iron hydroxide, also known as high iron hydroxide, chemical formula Fe (OH)three, molecular weight 106.87.Brown cubic crystals or brown flocculating precipitates.Dehydration after heating to above 500 ℃Ferric oxide。Insoluble in water, ethanol and ether, the newly prepared ones are easily soluble in inorganic acids and organic acids, but difficult to dissolve after aging.Andsodium carbonateEutectic availableSodium ferrite。It is prepared by reacting ferric nitrate or ferric chloride with ammonia to form precipitation.It is used as a purifying agent, absorbent, pigment, medicine and arsenic detoxification agent.When mixed with calcium oxide, cyanide and hydrogen sulfide in gas can be removed.[1]
Iron hydroxide is red brown amorphous powder or gel.It decomposes gradually when heated, and becomes completely dehydrated when it is higher than 500 ℃ferric oxide。Insoluble in waterethanolandEther, soluble in acid.The solubility in acid depends on the length of time the product is made, and the new product is easily soluble inInorganic acidandOrganic acidIt is difficult to dissolve after being placed for several times.Slightly dissolved in alkali solution to form iron (Ⅲ) acid salts, such as NaFeOtwo。This type of ferric (Ⅲ) acid salt can easilyferric oxide(III) andalkali metalOxideshydroxideorcarbonateIn a molten mixture.[1-2]
Calculate chemical data
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1. Reference value for drainage parameter calculation (XlogP): None
2. Number of hydrogen bond donors: 3
3. Number of hydrogen bond receptors: 3
4. Number of rotatable chemical bonds: 0
5. Number of tautomers: none
6. Topological molecular polar surface area: 3
7. Number of heavy atoms: 4
8. Surface charge: 0
9. Complexity: 0
10. Number of isotope atoms: 0
11. Determine the number of atomic structure centers: 0
12. Number of uncertain atomic structure centers: 0
13. Determine the number of chemical bond structural centers: 0
14. Number of indeterminate chemical bond structure centers: 0
15. Number of covalent bond units: 4[2]
synthetic method
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Preparation method: 100mL 0.2mol/LFerric nitrateWater solution, add 1mol/L drops under intense stirringsodium hydroxideAqueous solution, adjust the pH to about 1.5.Add the solution bit by bit to 1L 1mol/L sodium hydroxide aqueous solution after continuous stirring.After dropping, stand for 10~15min, separate the upper layer of clarified solution after sedimentation and sedimentation, and wash with a large amount of distilled water to make the pH approximately 7.8.The precipitates were centrifuged and dried at room temperature.In order to avoid the ripening of sediment, wash and dry it as soon as possible.[2]
The sample thus prepared is an aggregate of amorphous ultrafine primary particles (about 5nm).At room temperature, its magnetization curve has typical superparamagnetic characteristics.If the concentration of sodium hydroxide aqueous solution during precipitation is increased, the water content decreases and the saturation susceptibility increases.Generally, the primary particle size does not change much due to the experimental conditions, which is generally 4~5nm.In addition, the sample contains about 0.5% (mass fraction) (with NatwoO) Na+, causing difficulty in washing.Ammonia water can prevent such pollution.usePotassium hydroxideIt will accelerate the transformation to α - FeO (OH), so it is not suitable.[2]
application area
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It is used to manufacture medicine, pigment, and arsenic antidote.It can also be used as catalyst, water purification agent, etc.[3]
