Preparation of highly sensitive sensors based on polystyrene microspheres for the detection and removal of Hg²⁺ ions

Abstract

Detection and the simultaneous removal of mercury ions are of vital importance. In this study, fluorescent monomers, small molecular sensors, were first synthesized using 4‐bromo‐naphthalic anhydride as precursor. These double bond bearing sensors were then grafted to polystyrene (PS) microspheres through dispersion polymerization. The sensors still retained their detecting ability when they were anchored on the surfaces of PS microspheres. Upon the addition of Hg2+ ions to the PS microspheres, both the color and the fluorescence intensity changed, which could be employed to detect Hg2+ ions. The absorption capacity of the two kinds of PS microspheres reached 0.557 mg g−1 and 0.628 mg g−1 respectively. The PS microspheres still remain their fluorescence and absorption even used for five times. These polymeric highly sensitive chemosensors may see their applications in purification of polluted environments. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 4592–4600

Fluorescent and colorimetric sensors for environmental mercury detection

“…186 As a result of selective binding of Hg 2+ between two T bases to achieve a hairpin structure, green fluorescence is observed after addition of SG dye. 187 The monomers anchored on the surfaces of the PS microspheres selectively respond to Hg 2+ , resulting in changes in both the fluorescence color and intensity. Hg 2+ can be detected visually at concentrations as low as 10 nM.…”

“…However, addition of the dye leads to yellow fluorescence in the absence of Hg 2+ . [185][186][187][188] Poly(N-isopropylacrylamide) microgels (PNIPAM MGs) were incorporated into photoluminescent gold nanodots (AuNDs) for selective recognition of Hg 2+ ( Figure 75D). Fluorescent monomers were fabricated by grafting a 4bromonaphthalic anhydride precursor onto polystyrene (PS) microspheres by dispersion polymerization to achieve the simultaneous detection and removal of Hg 2+ ( Figure 75C).…”

“…75C). 187 The monomers anchored on the surfaces of the PS microspheres selectively respond to Hg 2+ , resulting in changes in both the fluorescence color and intensity. These optical changes enable Hg 2+ to be easily distinguished.…”

“…75 Hg 2+ sensing based on micelles. [185][186][187][188] Fig. 76 Hg 2+ sensing based on strip and chip.…”

Highly sensitive fluorescent polyamide for detection of Hg2+, Hg+, Fe3+, and Fe2+ ions

“…Likewise, Hg 2+ ions will cause chronic poisoning if the content of Hg 2+ (refs. and ) ions accumulate to a certain extent in vivo .…”