荧光素-层状双金属氢氧化物复合体的发光性能及对Fe3+的荧光识别  

Photoluminescence Property of Layered Double Hydroxide Composite with Fluorescein and Detection Towards Fe3+

作　　者：梁足培 苏飞飞 国荣 唐昱垚 金烁 于梓洹 李建 马淑兰[2] LIANG Zupei;SU Feifei;GUO Rong;TANG Yuyao;JIN Shuo;YU Zihuan;LI Jian;MA Shulan(Chemistry&Chemical and Environmental Engineering College,Weifang University,Weifang 261061,China;College of Chemistry,Beijing Normal University,Beijing 100875,China)

机构地区：[1]潍坊学院化学化工与环境工程学院,潍坊261061 [2]北京师范大学化学学院,北京100875 [3]北京市第五十五中学

出　　处：《高等学校化学学报》2019年第7期1352-1358,共7页Chemical Journal of Chinese Universities

基　　金：山东省自然科学基金(批准号:ZR2015BL024);国家自然科学基金(批准号:U1832152);北京市自然科学金(批准号:2182029)资助~~

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3.44×10^2 L/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(Ksv)is 3.44×10^2 L/mol.

关 键 词：荧光素 层状双金属氢氧化物 荧光化学传感 Fe^3+识别 

分 类 号：O614[理学—无机化学]