Magnesium-aluminum oxide (Mg-Al oxide) prepared by the thermal decomposition of a hydrotalcite-like compound was found to have potential for treating NaBF4 wastewater. The Mg-Al oxide removed the BF4- and F- and H3BO3 from the NaBF4 solution. With increasing Mg-Al oxide quantity and time, the BF4- concentration decreased and the degree of BF4-, F-, and boron removal increased. The decrease in the BF4- concentration resulted from uptake by the Mg-Al oxide and not hydrolysis. The Mg-Al oxide took up F- from the solution preferentially. The Mg-Al oxide also converted the H3BO3 in the aqueous solution into H2 BO3-, which it took up.
- Hydrotalcite-like compound
- Magnesium-aluminum oxide