Aspect ratio-controlled preparation of α-CaSO4·0.5H2O from phosphogypsum in potassium tartrate aqueous solution?
RSC Advances Pub Date: 2019-07-11 DOI: 10.1039/C9RA03569A
Abstract
In this study, a simple and efficient strategy is developed to synthesize rod-shaped α-CaSO4·0.5H2O crystals with tunable aspect ratio from industrial phosphogypsum only in potassium tartrate aqueous solution at a low temperature. Industrial phosphogypsum can be effectively converted into rod-shaped α-CaSO4·0.5H2O crystals with the assistance of potassium tartrate, and the aspect ratio of α-CaSO4·0.5H2O crystals gradually decreases from 52?:?1 to 1?:?1 with increasing the concentration of potassium tartrate. The formation process of the rod-shaped α-CaSO4·0.5H2O crystals in this system involves the dissolution of CaSO4·2H2O and nucleation of α-CaSO4·0.5H2O crystals. The tartrate ions from potassium tartrate in this system preferentially bind to (001) and (002) facets of α-CaSO4·0.5H2O crystals, inhibiting the growth of α-CaSO4·0.5H2O crystals along the c-axis and controlling its morphology and aspect ratio.
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Journal Name：RSC Advances
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CAS no.: 89640-58-4
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