期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 51, 期 8, 页码 4549-4558出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.6b05815
关键词
-
资金
- National Science Foundation by INFEWS [N/P/H2O:SusChEM CHE-1610832]
- UROP fellowship from the University of Minnesota
- North Star Alliance
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1610832] Funding Source: National Science Foundation
The ability of complexes of hard and labile metal ions with one or more open coordination sites to capture phosphates with high affinity and selectivity directly in water at neutral pH and release them under acidic conditions is evaluated with Gadolinium-2,2',2-(((nitrilotris(ethane-2,1-diy1))-tris(azanediyl)) tris (carb onyl)) tris (4-oxo-4H-pyran-3-olate) ( Gd-TREN-MAM). This model lanthanide complex has two open coordination sites that, at neutral pH, are filled with water molecules. In water at neutral pH, Gd-TREN-MAM binds phosphate with high affinity (K-a = 1.3 X 10(4)) via the formation of a ternary complex in which one phosphate replaces both inner-sphere water molecules. The formation of this complex is highly pH-dependent; the phosphate is completely released from Gd-TREN-MAM below pH 2. Because the Gd-III ion remains complexed by its ligand, even under strong acidic conditions, Gd-TREN-MAM can be used at least 10 times in a pH-based recycling scheme that enables the catch and release of one phosphate per cycle. Gd-TREN-MAM is highly selective for phosphate over other anions of environmental concerns, Mcluding HCO3-, HCO2-, CH3CO2, SO42-, NO3-, NO2-, BrO3-, AsO4-, F-, Cl-, and Br- and, to a lesser extent, ClO3-. The. development of such receptors that bind phosphate reversibly in a pH-dependent manner opens the possibility to design catch-and-release systems for the purification of surface waters.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据