Abstract
It was essential to effectively track heavy metal ions in water systems. A novel Mg(DBM)2@Calcium alginate (Mg(DBM)2@CaAlG) nanofibrous membrane sensor was fabricated by electrospinning for visual and quantitative detection of Cd2+ in water. The sensor possessed high selectivity, portability and anti-interference features in detection of Cd2+. Quick monitoring within 8 min was realized with the limit of detection of 0.14 nM, which was much lower than the World Health Organization’s permission of [Cd2+] in potable water. The fluorescence enhancement effect of the membrane achieved by ions exchange and complexation. Moreover, combined with a smartphone, the membrane enables realize real-time, on-site and quantitative detection by capturing the fluorescence color change. The recovery rate of membrane on tap water and seawater samples was close to 100 %, verifying excellent applicability. This detection method showed a broad application prospect in real-time and on-site detection of Cd2+ in drinking water and provided a feasible approach for environmental monitoring.
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