Add time:07/25/2019         Source:sciencedirect.com

A novel and low-cost optical sensor for heavy metal ion detection has been prepared by immobilizing 4-(2-pyridylazo)-resorcinol (PAR) on the functionalized hexagonal mesoporous silica (HMS) via N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride (TMAC). The successful fabrication of this optical sensor is confirmed by extensive characterizations using FT-IR, low angle X-ray diffraction (XRD), UV–vis spectroscopy and N2 sorption, meanwhile its colorimetric properties, selectivity, sensitivity and reversibility are also investigated. The optical sensor responds selectively to heavy metal ions, such as Fe3+, Cd2+, Ni2+, Zn2+, Pb2+, Co2+, Hg2+ and Cu2+ with a color change from yellow to orange or purple in alkaline solutions, while it shows a color change only for Cu2+ under strongly acidic conditions. At pH 12.0, this optical sensor has a high sensitivity that makes it possible to detect Cu2+ in aqueous solution with the detection limit as low as 40 ppb by naked-eye. This optical sensor also shows excellent reversibility and regeneration by treatment with a solution of EDTA.

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