Removal of tetrafluoroborate ion from aqueous solution using magnesium–aluminum oxide produced by the thermal decomposition of a hydrotalcite-like compound

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 image and F− and H3BO3 from the NaBF4 solution. With increasing Mg–Al oxide quantity and time, the image concentration decreased and the degree of image, F−, and boron removal increased. The decrease in the image 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 image, which it took up.