Black ferric arsenate crystal and synthesis method thereof

Abstract

The invention discloses a black ferric arsenate crystal. The black ferric arsenate crystal is a micrometer petal-shaped particle, the particle size is 10 to 20mu m, and the appearance feature is black powder; a chemical formula of the black ferric arsenate crystal is Fe6(AsO4)5; diffraction peaks 2theta are equal to 13.9, 16.0, 21.2, 24.9, 25.2, 27.8, 28.4, 29.1, 30.5, 32.3, 34 and 34.2. The invention also discloses a synthesis method of the black ferric arsenate crystal. The synthesis method comprises the following steps of using ferric nitrate, sodium arsenate, nitric acid and deionized water to prepare a synthesis solution; mixing alcohol and the synthesis solution according to a volume ratio, so as to obtain a mixed solution; adding the mixed solution into a high-pressure reaction kettle to react for 8 to 24 hours at the temperature of 160 to 200 DEG C; after reacting, centrifuging, flushing solids by alcohol and water, and drying, so as to obtain the black ferric arsenate crystal. The synthesis method has the advantage that after the black ferric arsenate crystal is synthesized, the removal rates of Fe and As are respectively greater than 97%, so that the application potential in an As removal field is very large.

Description

technical field [0001] The invention relates to the technical field of crystal synthesis, in particular to a black iron arsenate crystal and a synthesis method thereof. Background technique [0002] As a common environmental pollutant, arsenic has received extensive attention in recent years. In the arsenic removal process, the iron salt method has more advantages than the sulfidation method and the lime neutralization method, which is shown in 1) for high-concentration arsenic-containing wastewater, it can form iron arsenate compound to remove arsenic by co-precipitation; 2) for low-concentration arsenic-containing wastewater Arsenic wastewater can be adsorbed to remove arsenic by using iron oxides and hydroxides. Therefore, iron arsenate compound is a common waste residue in the treatment of arsenic-containing wastewater. In addition to the amorphous phase, iron arsenate also includes a variety of crystals with different crystal water contents, such as FeAsO 4 0.75H 2 ...

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Problems solved by technology

FeAsO 4 3.5H 2 O to FeAsO 4 2H 2 O is more stable, but FeAsO 4 3.5H 2 The microstructure of O is not yet clear, and it is speculated that it has the same 2 (SO 4 ) (AsO 4 )(OH)·9H 2 O(Bukovskyite) similar chain structure [Hydrometallurgy117–118(2012)47–56]

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