Abstract
Abstract The present paper discusses a new method for removing and solidifying halogenide ions from solution by a reaction with Bi5(NO3)O7. Since this compound is isostructural with Bi5(I)O7 or Bi5(Br)O7, an ion exchange of the halogen ions with NO3− is expected. Bi5(NO3)O7 was reacted with aqueous halogenide ions at 25, 50, and 75 °C. The iodide ion was removed almost perfectly at 50 and 75 °C. The reactions were completed after 15 h. The bromide ion was also removed almost perfectly at 25, 50, and 75 °C. The reactions at 50 and 75 °C were completed after 24 h. The chloride ion was also removed by reactions at 50 and 75 °C, which were almost completed after about 48 h. The fluoride ion was not removed. The iodide and bromide ions reacted with Bi5(NO3)O7 to form Bi5(X)O7 (X = I or Br), provided that their concentrations were below 2.0 and 1.0 mol dm−3, respectively. The chloride ion formed other types of compounds, such as Bi12(Cl2)O17 or Bi3(Cl)O4. The ion-exchange capacities of iodide, bromide and chloride ions were observed at 50 and 75 °C.
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