期刊
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
卷 116, 期 1350, 页码 192-197出版社
CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI
DOI: 10.2109/jcersj2.116.192
关键词
Zn-Fe layered double hydroxide; thermal behavior; harmful anions adsorption
A zinc-iron layered double hydroxide (Zn-Fe LDH) with sulfate as the interlayer ainon has been prepared by the coprecipitation method. The LDH was dehydrated in three steps below 300 degrees C and transformed to the amorphous phase. The recrystallization from the amorphous phase to ZnO (zincite), ZnFe2O4 (spinel) and Zn3O (SO4)2 occurred at approximately 450 degrees C. Furthermore, Zn3O (SO4)2 decomposed into ZnO, SO2 and O-2 above 700 degrees C. The adsorption ability of the Zn-Fe LDH was studied for several harmful anions (phosphate, chromate, borate, fluoride, selenate and arsenate) in aqueous solution, and it showed high selectivity for phosphate, chromate and selenate ions. The Zn-Fe LDH was found to be stable over a wide pH range (pH 2-12). The adsorption ability for phosphate ions depends on the initial pH and it increases with decreasing pH.
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