ZnAl 层状双氢氧化物及其焙烧产物对磷酸盐具有高吸附选择性。
High adsorption selectivity of ZnAl layered double hydroxides and the calcined materials toward phosphate.
机构信息
College of Chemistry, Beijing Normal University, Beijing 100875, China.
出版信息
J Colloid Interface Sci. 2010 Mar 1;343(1):225-31. doi: 10.1016/j.jcis.2009.11.004. Epub 2009 Nov 10.
The selective adsorption of phosphate ions was investigated on CO(3)(2-), Cl(-), and NO(3)(-)-type ZnAl layered double hydroxides (LDHs) and the calcined CO(3)(2-)-type LDH at 200, 400, 600 and 800 degrees C, respectively. The calcined LDHs and NO(3)(-)-type LDH showed high selectivity toward phosphate ions, while the Cl(-)-type LDH shows selectivity toward both SO(4)(2-) and phosphate ions. The NO(3)(-)-type LDH selectively adsorbed phosphate ions mainly through ion exchange. The calcined samples possibly proceed through ligand complexation or electrostatic attraction between phosphate ions and hydrated ZnO formed after calcination, although the structural memory effect was observed for the samples calcined below 600 degrees C with the formation of CO(3)(2-)-type LDH. Adsorption/desorption behaviors indicated that the calcined samples had good stability and reusability.
研究了在 200、400、600 和 800°C 下分别以 CO(3)(2-)、Cl(-)和 NO(3)(-)型 ZnAl 层状双氢氧化物 (LDHs) 和煅烧的 CO(3)(2-)型 LDH 对磷酸盐离子的选择性吸附。煅烧的 LDH 和 NO(3)(-)型 LDH 对磷酸盐离子具有高选择性，而 Cl(-)型 LDH 对 SO(4)(2-)和磷酸盐离子均具有选择性。NO(3)(-)型 LDH 主要通过离子交换选择性吸附磷酸盐离子。煅烧后的样品可能通过配体络合或煅烧后形成的水合 ZnO 与磷酸盐离子之间的静电吸引作用来进行吸附，尽管对于在 600°C 以下煅烧的样品，观察到了结构记忆效应，形成了 CO(3)(2-)型 LDH。吸附/解吸行为表明，煅烧后的样品具有良好的稳定性和可重复使用性。
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