A novel permanganate-sensitive fluorescent nano-chemosensor assembled with a new 8-hydroxyquinoline-functionalized SBA-15.

A novel fluorescence nano-chemosensor for MnO(4)(-) anion has been developed by assembly of fluorescent aluminum complex of 8-hydroxyquinoline (8-HQ) within the channels of modified SBA-15 (SBA-SPS-QAl). The ordered porous structure of SBA-15 is still retained after hybridization by chemosensor material. A remarkable fluorescent quenching of SBA-SPS-QAl was attributed to the effect of MnO(4)(-) anion. The linear detecting range of the hybrid mesoporous chemosensor is 0.16-4.6μmolL(-1) of MnO(4)(-) anion and the lowest detection limit is 0.2ngmL(-1) in the aqueous solution. SBA-SPS-QAl showed a selective and sensitive fluorescent quenching response toward MnO(4)(-) ion in comparison with N(3)(-), NO(3)(-), CN(-), HCO(3)(-), Cl(-), F(-), H(2)PO(4)(-), SO(4)(2-), Cr(2)O(7)(2-), IO(3)(-) and I(-) ions, which was because of the higher stability of its inorganic complex with permanganate anion.