Highly sensitive fluorescence probe based on functional SBA-15 for selective detection of Hg2+ in aqueous media.
An inorganic-organic hybrid fluorescence chemosensor (R6G-SBA-15) was prepared by covalent immobilization of a Rhodamine 6G derivative within the channels of mesoporous silica material SBA-15 via triethoxysilane groups. The primary hexagonally ordered mesoporous structure of SBA-15 is preserved after the grafting procedure. R6G-SBA-15 features effectively chromogenical and fluorogenical responses with a broad pH span (2-10), excellent sensitivity to environmentally relevant mercury levels lower to ppb range. It also exhibits Hg(2+)-specificity over various competitive cations, including alkali and alkaliearth, the first-row transition metals as well as heavy metals such as Pb(2+), Cd(2+) and Ag(+), etc. Additional experiments establish the well-fitted linearity function of the fluorescent intensity with the concentration of Hg(2+) in aqueous solution, suggesting the possibility for real-time qualitative or quantitative detection of Hg(2+) and the convenience for potential application in toxicology and environmental science.
Zhou
Peng
P
State Key Laboratory of Fine Chemicals, Dalian University of Technology, 158 Zhongshan Road, Dalian, 116012, China.
Meng
Qingtao
Q
He
Guangjie
G
Wu
Hongmei
H
Duan
Chunying
C
Quan
Xie
X
D005453:Fluorescence; D008628:Mercury / Q000737:chemistry*; D015394:Molecular Structure; D012680:Sensitivity and Specificity; D012822:Silicon Dioxide / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry; D014877:Water Pollution, Chemical
C509969:SBA-15; D014874:Water Pollutants, Chemical; D014867:Water; D012822:Silicon Dioxide; D008628:Mercury