【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Fe³⁺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Fe³⁺的选择性识别能力很强,远优于其它离子(Mg²⁺,Ni²⁺,Co²⁺,Cu²⁺,Zn²⁺,Pb²⁺,Cd²⁺和Hg²⁺).该复合体与Fe³⁺结合发生荧光猝灭现象,可将其用作检测Fe³⁺的荧光传感器. Fe³⁺检测限为1. 27×10^-7mol/L,猝灭常数(K_sv)为3. 44×10²L/mol.更多还原

【Abstract】 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 Fe³⁺over other ions( Mg²⁺,Ni²⁺,Co²⁺,Cu²⁺,Zn²⁺,Mn²⁺,Pb²⁺,Cd²⁺,and Hg²⁺) with obvious fluorescence quenching,which can work as a kind of effective fluorescence sensor for detection of Fe³⁺. The detection limit of Fe³⁺is determined to be 1. 27 × 10^-7 mol/L and the quenching constant( K_sv) is 3. 44×10² L/mol.更多还原