Magnetic mesoporous nanomaterials with AIE properties for selective detection and removal of CN− from water under magnetic conditions

Abstract

We have prepared a type of magnetic mesoporous nanomaterial with aggregation-induced emission properties (Fe₃O₄@mSiO₂@TPA@BA, hence abbr. FSTB) to detect and remove cyanide ions (CN⁻) under magnetic conditions. FSTB has a large specific surface area and improved fluorescence performance to identify CN⁻, and its superparamagnetic behavior plays an important role in removing CN⁻. The magnetic sensor FSTB shows excellent selectivity and anti-interference for the detection of CN⁻ in aqueous solutions. It is obvious from the equation LOD = 3δ/S that the limit of detection (LOD) of FSTB for CN⁻ is significantly lower than the permissible level of CN⁻ in drinkable water recommended by the World Health Organization. Therefore, the magnetic sensor FSTB has a wide range of applications for detecting and removing harmful CN⁻.