Highly Selective and Sensitive Sulfonylhydrazone Type Fluorescent Probe for Rapid Detection of Mercury(II) and Its Application in Logic Gate and Adsorption

Abstract

AbstractIn this study, 4‐bromotriphenylamine, 5‐formaldehyde thiophene‐2‐boronic acid and benzenesulfonyl hydrazide were used as materials to synthesize a novel type of Schiff base fluorescent probe molecule N′‐((5‐(4‐(diphenylamino)phenyl)thiophen‐2‐yl)methylene)benzenesulfonohydrazide (BS), and its structure was characterized by nuclear magnetic resonance (NMR) and high resolution mass spectrometry (HR‐MS). BS exhibited excellent solvatochromic effect and aggregation‐induced emission enhancement, and had rapid recognition, high selectivity and specificity for Hg2+, the detection limit was as low as 2.84×10−8 M, and the response time is only 15 s. It has passed the 1H NMR titration experiment verified its possible response mechanism. Through the good reversible performance of BS, molecular logic gate was constructed with Hg2+ and EDTA as chemical inputs. In practical applications, polyacrylamide (PAM) doped BS (PAM‐BS) could achieve high‐efficiency adsorption of Hg2+, with a removal rate of 99.93 %, and the microscopic morphology and element changes before and after PAM‐BS adsorption were compared by SEM‐EDS.