排序方式: 共有5条查询结果,搜索用时 10 毫秒
1
1.
稀土与酸性萃取剂形成的溶液聚集态结构 总被引:7,自引:0,他引:7
用Fourier变换红外光谱(FT—IR)和光子相关光谱(PCS)研究了皂化的有机磷酸酯类萃取剂和环烷酸萃取剂在正庚烷或正庚烷与2-辛醇的混合溶剂中所形成的聚集物,以及萃取稀土元素后有机相聚集物的变化.结果表明,有机磷酸酯在正庚烷中皂化后形成反向胶团((?)_h<5.0nm),其平均流体力学半径与萃取剂分子的长度相当;2-辛醇的加入可增大反向胶团的粒径.环烷酸皂化后能在混合溶剂中形成W/O型微乳状液(5.0 nm<(?)_h<100 nm).皂化萃取剂萃取稀土元素后,有机相中形成不稳定的聚集物,继而产生聚凝.讨论了聚凝过程的可能机理. 相似文献
2.
Thesolventextractionofcobaltwithorganophosphorusacidicextractantsischaracterizedbyitshigherextractionselectivitythannickelfromaqueoussolutions[1].Theextractabilityandselectivityofmetalionsarecloselyrelatedtothecoordinationstructureofmetalswithextractan… 相似文献
3.
萃取体系中钴与二(2-乙基己基)磷酸的络合物结构和聚集行为 总被引:1,自引:0,他引:1
采用Fourier变换红外光谱 (FT IR)、紫外 可见光谱 (UV VIS)、以及光子相关光谱 (PCS)等技术研究了钴 (Co)与二 ( 2 乙基己基 )磷酸 (HDEHP)在萃取体系中所形成的络合物的结构、聚集行为、以及助表面活性剂 ( 2 辛醇 )的影响 .结果表明 :在正庚烷中 ,Co与HDEHP形成四面体络合物 ,其聚集物尺寸很小 (半径约 1 0nm) ;2 辛醇的加入使无水的四面体配位转变为部分水化的八面体配位结构 ,同时其聚集物的尺寸有所增大 .水相中离子强度 (NaCl)可影响萃取有机相中Co HDEHP络合物的二种配位结构间的转变平衡 .红外吸收光谱结果还说明 ,Co与HDEHP在正庚烷中形成螯合型络合物 ,在 2 辛醇与正庚烷的混合溶剂中形成桥式配位的络合物 相似文献
4.
5.
Investigation of aggregation in solvent extraction of lanthanides by acidic extractants (organo-phosphorus and naphthenic acid) 总被引:2,自引:0,他引:2
Three acidic extractants (Ⅰ) di(2-ethylhexyl) phosphoric acid (HDEHP),(Ⅱ) 2-ethylhexyl phos-phonic acid mono-2-ethylhexyl ester (KEHPEHE) and (Ⅲ) naphthenic acid were employed in preparing the samples for the characterization of the coordination structure of lanthanlde-extractant complexes and the physicochemical nature of aggregates formed in the organic diluent of the solvent extraction systems.Photo correlation spectroscopy (PCS) re-suits on the aggregates formed by the partially saponified HDEHP in n -heptane showed that the hydrodynamic radius of the aggregates was comparable to the molecular dimensions of HDEHP.The addition of 2-octanol into the diluent,by which the mixed solvent was formed,increased the dimensions of the corresponding aggregates.Aggregates formed from the ianthamde ions and HDEHP in the organic phase of the extraction systems were found very unstable.In the case of naphthenic acid,PCS data showed the formation of w/o microemulsion from the saponified naphthenic acid in the mix 相似文献
1