An inorganic–organic silica material (SBA-15-
1), prepared by immobilization of the naphthalimide derivative within the channels of the mesoporous silica material SBA-15, is characterized by several spectroscopic methods. SBA-15-
1 can be used as a chemical sensor for detecting and removing Hg
2+ in a heterogeneous system. The fluorescence enhancement of SBA-15-
1 was attributed to the formation of a complex between SBA-15-
1 and Hg
2+ by a 1:1 complex ratio with the photo-induced electron transfer (PET) being forbidden. The sensor can be applied to the quantification of Hg
2+ with a linear range covering from 1.0 × 10
−7 to 1.0 × 10
−5 M under the neutral condition. Most importantly, the fluorescence changes of the sensor are remarkably specific for Hg
2+ in the presence of other metal ions. Moreover, the response of the sensor toward Hg
2+ is fast and chemically reversible. In addition, the sensor has been used for the determination of Hg
2+ in environmental samples with satisfactory results.
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