Synthesis and Application of 3‐Pyridinecarbaldehyde Immobilized on MCM‐41 for Trace Analysis and Preconcentration of Copper Ions in Different Water Samples

Abstract

AbstractSynthesis, characterization, and application of 3‐pyridinecarbaldehyde immobilized on MCM‐41 (Py−N‐MCM‐41) was studied. Trace analysis and pre‐concentration of copper ions in water samples was done by Py−N‐MCM‐41as an adsorbent prior to flame atomic absorption spectrometry. X‐ray diffraction of calcined MCM‐41 exhibited that is characteristic of the mesopores silica with hexagonal symmetric structure. Fourier transform infrared spectrum of the Py−N‐MCM‐41demonstrated the existence of functional groups and N2 adsorption‐desorption showed Brunauer‐Emmett‐Teller surface area of 770 m2 g−1 and pore diameter of 2.42 nm. After 30 min stirring, Cu2+ was extracted at pH 5–7. The highest adsorption capacity of the Py−N‐MCM‐41 was 135 μg mg−1. Based on the lowest quantity of acid to strip the ions from adsorbent, the technique's pre‐concentration factor was 30. The relative standard deviation (C=40 ng mL−1, n=5) was 2.9 % and detection limit was 1.6 ng mL−1. An acceptable consistency was observed between the measured amounts of Cu2+ by the thermal and proposed pre‐concentration approaches in different water samples, suggesting high accuracy of the technique.