Abstract
Uranium is one of the most frequently used radioactive element but is also known for its toxicity towards variety of species. To study the thermodynamic features and to identify the optimal condition of the precipitation treatment of wastewater that contains uranium, Pourbaix diagram was constructed based on the temperature of 288K, 298K, 308K, and 318K. Between the temperature of 288K to 318K, uranium can exist in the form of U<sup>4+</sup>, UO2<sup>2+</sup>, U<sub>3</sub>O<sub>8</sub>, UO<sub>3</sub>, and UO<sub>2</sub> in wastewater. Among these five compounds, UO<sub>2</sub> was the most dominant compound, followed by UO2<sup>2+</sup>, U<sub>3</sub>O<sub>8</sub>, UO<sub>3</sub>, and U<sup>4+</sup>. Also, UO2<sup>2+</sup> and U<sup>4+</sup> existed as ion, while UO<sub>3</sub>, UO<sub>2</sub>, and U<sub>3</sub>O<sub>8</sub> existed as precipitates. At the temperature of 288K, 298K, 308K, and 318K, UO<sub>2</sub> started the precipitation reaction from pH 0.9435, 0.9451, 0.9467, and 0.9481, while U<sub>3</sub>O<sub>8</sub> and UO<sub>3</sub> started the precipitation reaction at pH 5.2727, 5.2712, 4.9277, and 4.7716, while UO<sub>3</sub> was from 7.3587, 7.3610, 7.1942, 6.8121 respectively. Between pH 0 to pH 14, the ratio of compound to ion was approximately 2 to 1, and the ratio increased as the temperature increased.
Published Version
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More From: Journal of Korean Society of Water Science and Technology
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