Origin of Selective Nitrate Removal by Ni<sup>2+</sup>–Al<sup>3+</sup> Layered Double Hydroxides in Aqueous Media and Its Application Potential in Seawater Purification
作者:Ryo Sasai、Takuya Fujimura、Hiroaki Sato、Eisaku Nii、Mako Sugata、Yuto Nakayashiki、Hirokazu Hoashi、Chikako Moriyoshi、Eiichi Oishi、Yasuhiro Fujii、Shogo Kawaguchi、Hiroshi Tanaka
DOI:10.1246/bcsj.20220032
日期:2022.5.15
nitrate anion selectivity in layered double hydroxide (LDH; [Ni1−xAlx(OH)2]Clx) materials (i.e., Cl−-NiAl(x)LDH; x = 1/3 and 1/5) comprising Ni2+, Al3+, and exchangeable chloride anions, the equilibrium and kinetic properties of the chloride-to-nitrate anion exchange reaction were investigated in aqueous media. The anion exchange isotherms of the studied systems showed that the nitrate anion selectivity
了解层状双氢氧化物 (LDH; [Ni 1− x Al x (OH) 2 ]Cl x ) 材料 (即 Cl - -NiAl( x )LDH; x = 1/3 和1/5)由Ni 2+、Al 3+和可交换的氯阴离子组成,研究了水介质中氯-硝酸根阴离子交换反应的平衡和动力学性质。所研究系统的阴离子交换等温线表明,硝酸根阴离子选择性在x = 1/5时显着高于x= 1/3。LDH材料的精细晶体结构和硝酸根阴离子在其层间空间中的水合状态分别通过同步辐射X射线衍射(SXRD)和拉曼光谱进行了鉴定。Cl - -NiAl( x )LDH ( x = 1/3 和 1/5)的硝酸根阴离子选择性由氯离子和硝酸根阴离子的热振动参数大小之间的关系确定;阴离子交换反应主要生成 NiAl( x)LDH 含有具有较小热振动参数的阴离子。阴离子交换反应的时间分辨 SXRD 测量表明交换途径因硝酸根阴离子选择性而异。Cl - -NiAl(