香豆素修饰SBA-15材料及其对Fe^(3+)的识别和吸附性能

Coumarin modified SBA-15 material used for selective recognition and adsorption of Fe^(3+)

通过将香豆素探针以共价键负载到介孔硅材料SBA-15上,合成了一种无机-有机杂化荧光材料SBA-K,FT-IR、TEM表征结果证明香豆素探针成功负载于SBA-15上,负载后介孔材料的有序孔道没有被破坏。在HEPES悬浮液(0.02 M,CH3OH/water=99.5/0.5,v/v,p H 7.2)中,SBA-K在常见金属离子(K+,Na+,Ca2+,Mg2+,Cd2+,Ag+,Fe3+,Pb2+,Hg2+,Cr3+,Co2+,Ni2+,Fe3+,Zn2+)中能够专一性地荧光猝灭识别Fe3+。Fe3+可使体系荧光猝灭98%,引起体系颜色由无色立即变为棕黄色。此外,SBA-K对Fe3+表现较强的吸附能力,吸附率可达92.7%。

An inorganic - organic hybrid fluorescence material SBA-K was prepared by covalent immobilization of a coumarin derives within the channels of SBA-15. The characterization results of FT-IR, TEM demonstrate that coumarin is successfully grafted onto the inner surface of SBA-15 and its ordered mesoporous structure is not broken.SBA-K exhibited Fe^3＋-only turn-off fluorescence recognition among metal ions （K^＋,Na^＋,Ca^2＋,Mg^2＋,Cd^2＋,Ag^＋,Fe^3＋,Pb^2＋,Hg^2＋,Cr^3＋,Co^2＋,Ni^2＋,Fe^3＋,Zn^2＋）in HEPES （ 0.02 M, CH3OH/water = 99.5/0.5, v/v, pH 7.2 ） Suspension. The addition of Fe3~ led to a fluorescence quenching of 98% and an obvious Suspension change from almost colorless to Pale brown. Furthermore, SBA-K exhibited high adsorption capacity of 92.7% for Fe^3＋.