摘要
采用离子交换法合成了FLN/OS-LDH复合体(FLN:荧光素,OS:1-辛烷磺酸钠,LDH:镁铝型层状双金属氢氧化物),并研究了其光致发光和对Fe~(3+)的识别性能.固态时,FLN不发光,而FLN/OS-LDH复合体呈黄绿色荧光(发射波长为565 nm),是荧光素(FLN)的特征发射光.在甲酰胺(FM)中可将该复合体方便剥离为胶状悬浮液,其发射波长发生蓝移,为绿光发射(531 nm).研究了复合体剥离液对金属离子的荧光识别特性,发现其对Fe~(3+)的选择性识别能力很强,远优于其它离子(Mg~(2+),Ni~(2+),Co~(2+),Cu~(2+),Zn~(2+),Pb~(2+),Cd~(2+)和Hg~(2+)).该复合体与Fe~(3+)结合发生荧光猝灭现象,可将其用作检测Fe~(3+)的荧光传感器. Fe~(3+)检测限为1. 27×10~(-7)mol/L,猝灭常数(K_(sv))为3. 44×10~2L/mol.
FLN/OS-LDH composite( FLN is fluorescein,OS is 1-octane sulfonic acid sodium,and LDH is MgAl layered double hydroxide) was synthesized via ion-exchange method and the photoluminescence and detection for Fe( Ⅲ) was tested. In solid state,the FLN/OS-LDH composite displayed yellowish green emission( 565 nm) arising from organic FLN. In formamide( FM), the FLN/OS-LDH can be feasily delaminated into colloidal suspention,and showed blue-shifted green emission( ca. 531 nm). The recognition ability of the FLN/OS-LDH for metal cations was researched. The delaminated FLN/OS-LDH colloid in formamide exhibited high selectivity for Fe~(3+)over other ions( Mg~(2+),Ni~(2+),Co~(2+),Cu~(2+),Zn~(2+),Mn~(2+),Pb~(2+),Cd~(2+),and Hg~(2+)) with obvious fluorescence quenching,which can work as a kind of effective fluorescence sensor for detection of Fe~(3+). The detection limit of Fe~(3+)is determined to be 1. 27 × 10~(-7) mol/L and the quenching constant( K_(sv)) is 3. 44×10~2 L/mol.
引文
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