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

Chemosphere (2007-06-26)
Toshiaki Yoshioka, Tomohito Kameda, Motoya Miyahara, Miho Uchida, Tadaaki Mizoguchi, Akitsugu Okuwaki
ABSTRACT

Magnesium-aluminum oxide (Mg-Al oxide) prepared by the thermal decomposition of a hydrotalcite-like compound was found to have potential for treating NaBF(4) wastewater. The Mg-Al oxide removed the BF(4)(-) and F(-) and H(3)BO(3) from the NaBF(4) solution. With increasing Mg-Al oxide quantity and time, the BF(4)(-) concentration decreased and the degree of BF(4)(-), F(-), and boron removal increased. The decrease in the BF(4)(-) 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 H(3)BO(3) in the aqueous solution into H(2)BO(3)(-), which it took up.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Magnesium aluminate, spinel, nanopowder, <50 nm particle size (BET)
Sigma-Aldrich
Magnesium aluminate, single crystal substrate, <100>, 99.99% trace metals basis
Sigma-Aldrich
Magnesium aluminate, single crystal substrate, <111>, 99.99% trace metals basis
Sigma-Aldrich
Magnesium aluminate, single crystal substrate, <110>, 99.99% trace metals basis

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