title: Nitrate-ion-selective exchange ability of layered double hydroxide consisting of MgII and FeIII.
abstract: In this study, layered double hydroxide (LDH) consisting of Mg(II) and Fe(III) (Mg/Fe-LDH) was synthesized by using a combination of coprecipitation with hydrothermal aging, and its anion-exchange properties were investigated. Through various analyses, the chemical formula of the proposed Mg/Fe-LDH was determined to be [Mg(0.76)Fe(0.24)(OH)(2)](Cl(-))(0.21)(CO(3)(2-))(0.02)·0.76H(2)O. Furthermore, amorphous Fe(III) impurities were contained in the present Mg/Fe-LDH. The proposed Mg/Fe-LDH exhibited clear selectivity for nitrate ions dissolved in water. This selectivity for nitrate ions can be explained by an anion-sieve effect by the existence of amorphous Fe(III) impurities. Our findings suggest that it is possible to synthesize LDHs with high selectivity for various anions by effective hybridizing Fe(III) impurities.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan. rsasai@riko.shimane-u.ac.jp
authors.forename: Ryo
authors.initials: R
authors.lastname: Sasai
authors.forename: Wataru
authors.initials: W
authors.lastname: Norimatsu
authors.forename: Yukitaka
authors.initials: Y
authors.lastname: Matsumoto
mesh_terms: D000327:Adsorption; D005290:Ferric Compounds / Q000737:chemistry*; D007474:Ion Exchange; D008276:Magnesium Hydroxide / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry*; D033362:Powder Diffraction; D017550:Spectroscopy, Fourier Transform Infrared; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D009566:Nitrates; D014874:Water Pollutants, Chemical; C021024:ferric hydroxide; D008276:Magnesium Hydroxide