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- W3212816871 abstract "The influences of temperature and hydrogen ion concentration on wastewater containing cobalt ions were investigated by constructing Pourbaix diagrams for the Co<sup>0</sup>-H<sub>2</sub>O system at temperatures of 288, 298, 308, and 318 K with varying pH levels. The majority of cobalt in water has been observed to exist in the form of Co<sup>2+</sup> ions. Co<sup>0</sup> and Co<sup>2+</sup> are mutually interchangeable in acidic conditions depending on the reduction potential. Here, the conversion of Co<sup>2+</sup> to Co(OH)<sub>2</sub> and to Co(OH)<sub>3</sub> was observed when pH was increased to around pH 5.5 to 6.5; the pH at which the change occurred decreased as the temperature increased. The changes in reactivity between the chemical species Co<sup>0</sup>, Co<sup>2+</sup>, Co(OH)<sub>2</sub>, and Co(OH)<sub>3</sub> were quantified by measuring the area of stable conditions in the Pourbaix diagrams. The ratios of stable regions between Co(OH)<sub>3</sub>/Co<sup>2+</sup>, Co(OH)<sub>2</sub>/Co<sup>2+</sup>, Co<sup>0</sup>/Co<sup>2+</sup>, Co(OH)<sub>2</sub>/Co<sup>0</sup>, and Co(OH)<sub>2</sub>/Co(OH)<sub>3</sub> were observed to increase as the temperature increases. Therefore, the reactivity between these species was considered to in crease with temperature. These results indicate that it is necessary to consider the effect of temperature for the effective treatment of wastewater that contains cobaltions." @default.
- W3212816871 created "2021-11-22" @default.
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- W3212816871 date "2021-08-31" @default.
- W3212816871 modified "2023-10-18" @default.
- W3212816871 title "The Influence of Temperature on the Precipitating Treatment of Wastewater Containing Cobalt Ions" @default.
- W3212816871 doi "https://doi.org/10.17640/kswst.2021.29.4.29" @default.
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