Predominant hosting lead(II) in ternary mixtures of heavy metal ions by a novel of diethylaminomethyl-calix[4]resorcinarene
Predominant hosting lead(II) in ternary mixtures of heavy metal ions by a novel of diethylaminomethyl-calix[4]resorcinarene
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DOI：
10.1007/s13762-013-0298-9
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发表时间：
2014-05
影响因子：
3.1
通讯作者：
N. M. Yusof;Y. Kikuchi;T. Kobayashi
中科院分区：
文献类型：
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作者：
N. M. Yusof;Y. Kikuchi;T. Kobayashi
研究了杯状[4]间苯二甲酸乙酯在水-氯仿萃取中对Pb（II）、Cu（II）、Ni（II）三元体系的吸附。比较了在水层中不同pH的三元混合水溶液中，杯[4]间苯二甲酸乙酯、2,8,14,20-四烷基杯[4]间苯二甲酸乙酯- 4,6,10,12,16,16,18,22,24 -八烷基杯[4]间苯二甲酸乙酯、5,11,17,23-四（二乙基氨基甲基）-2,8,14,20-四烷基杯[4]间苯二甲酸乙酯、4,6,10,12,16,18,22,24-八烷基杯[4]间苯二甲酸乙酯、4,6,10,12,16、18,22,24-八烷基杯[4]间苯二甲酸乙酯的离子萃取效果。pH值为6 ~ 7时，二乙基氨基甲基杯[4]间苯二甲酸对Pb（II）的吸附效果较好。采用Langmuir等温线对Pb（II）、Cu（II）和Ni（II）离子在三元水混合物中的承载进行了研究。采用核磁共振波谱法研究了水-氘-氯仿萃取体系的吸附作用。结果表明，随着重金属离子进入宿主腔，在核磁共振波谱中可以观察到水分子的峰由下场向高场移动，这意味着水分子与重金属离子一起进入了宿主腔。光谱还表明，二乙胺基团表达了二乙胺甲基杯[4]间苯二甲酸与Pb（II）之间的配位配合物的形成，目的是优先承载Pb（II）。
Heavy metal ions from single and ternary systems of Pb(II), Cu(II), and Ni(II) adsorbed by calix[4]resorcinarenes in water–chloroform extraction were studied. Comparison was made of calix[4]resorcinarenes, 2,8,14,20-tetraundecyl calix[4]resorcinarene-4,6,10,12,16,18,22,24-octol, and diethylaminomethyl-calix[4]resorcinarene, 5,11,17,23-tetra(diethylaminomethyl)-2,8,14,20- tetraundecylcalix[4]resorcinarene-4,6,10,12,16,18,22,24-octol, for predominant extraction of their ions from the ternary mixture of aqueous solution at different pH in a water layer. The hosting of Pb(II) by the diethylaminomethyl-calix[4]resorcinarene occurred efficiently at pH 6–7. The hosting of Pb(II), Cu(II), and Ni(II) ions for the ternary aqueous mixture was applied to the Langmuir isotherm. Adsorption was studied using nuclear magnetic resonance spectroscopy in a water–deuterium chloroform extraction system. Results showed that as the heavy metal ions were included into the host cavity, the observation of shifted peaks of water molecules from downfield to higher field was visible in the nuclear magnetic resonance spectra, meaning that water molecules were included with heavy metal ion into the host cavity. The spectra also showed that the diethylamino group expressed formation of the coordination complex between the diethylaminomethyl-calix[4]resorcinarene and Pb(II) for the purpose of predominant hosting of Pb(II).