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Amino-functionalized luminescent MOF test paper for rapid and selective sensing SO2 gas and its derivatives by luminescence turn-on effect Meng Wang, Lin Guo, and Dapeng Cao Anal. Chem., Just Accepted Manuscript • DOI: 10.1021/acs.analchem.8b00146 • Publication Date (Web): 06 Feb 2018 Downloaded from http://pubs.acs.org on February 8, 2018
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Analytical Chemistry
Amino-functionalized luminescent MOF test paper for rapid and selective sensing SO2 gas and its derivatives by luminescence turn-on effect Meng Wang 1,#, Lin Guo 1,# and Dapeng Cao 1,2,* 1
State Key Lab of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China 2
Beijing Advanced Innovation Center for Soft Matter Science and Engineering,
Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China *Corresponding Author. Email:
[email protected] Tel: 8610-6443254
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ABSTRACT Rapid and selective sensing of sulfur dioxide (SO2) gas has attracted more and more attention because SO2 not only causes the environmental pollution but also severely affects the health of human being. In this work, we report an amino-functionalized luminescent MOF material (i.e. MOF-5-NH2), and further investigate its sensing property for SO2 gas and its derivatives as a luminescent probe. Results indicate that MOF-5-NH2 probe can selectively and sensitively sense SO2 derivatives (i.e. SO32-) in real-time by luminescence turn-on effect, and the lower detection limit is 0.168 ppm and the response time is less than 15 s. Importantly, the luminescence turn-on phenomenon can be observed by the naked eye. We also assemble MOF-5-NH2 into a test paper to achieve the aim of portable detection, and the lower limit concentration of the test paper for sensing SO2 in real-time is about 0.05 ppm. Moreover, MOF-5-NH2 also shows good anti-interference ability, strong luminescence stability and reusability, which means that this MOF-5-NH2 is excellent sensing candidate. The amino functionalization may also provide a modification strategy to design luminescent sensors for sensing other atmospheric pollutants.
Keywords: Amino functionalization; Metal-organic frameworks; Chemical sensors; Luminescence turn-on effect; Selective sensing; Portable test paper
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Analytical Chemistry
INTRODUCTION As a commercial reagent, sulfur dioxide (SO2) has been widely used in productions of sulfur containing salts, artificial fibers, dyes, pesticides and fungicides, and also plays an important role in metal processing and pulp making.1,
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However, the excess SO2
emission not only causes the extreme environment pollution but also severely affects the health of human being, like respiratory and nervous system diseases. Moreover, SO2 can easily dissolve in water and form a mixture of sulfite and bisulfite (SO32- and HSO3-), and these ions are easily oxidized to sulfate ions, which in turn leads to the formation of acid rain.3-7 In addition, sulfite and bisulfite also were often used as a cardiovascular system messenger at a lower concentration (
