Publications Repository - Gdańsk University of Technology

In the present study, we examined a novel functionalised magnetic nanoparticles Fe3O4@SiO2-Nn as a nano adsorbent for binding of Cd2+, Pb2+, Cu2+ ions in an aqueous solution. First, we obtained the nanoparticles functionalised with various carbon chains containing different number of amino groups: (3-amino)propyltriethoxysilane (Fe3O4@SiO2-N1), N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (Fe3O4@SiO2-N2) and N1-(3-trimethoxysilylpropyl)diethylenetriamine (Fe3O4@SiO2-N3). In the next step, we conducted their characterisation using SEM, TEM, FT-IR, and XPS methods. The detection of Cd2+, Pb2+, Cu2+ metal ions was performed under optimised experimental conditions using DPASV and HDME techniques. Using these methods we conducted the Cd2+, Pb2+, Cu2+ binding comparison in 4.5 μM concentration with 4 mg of Fe3O4@SiO2-Nn. Obtained results show that the adsorption rate of each ion differs due to the nanoparticles modification. The highest Pb2+ binding capacity was achieved using Fe3O4@SiO2-N1 and Fe3O4@SiO2-N2. The smallest binding capacity was observed for Cd2+ ions by Fe3O4@SiO2-N2 and Fe3O4@SiO2-N1. The Cd2+ biding was not observed for both Fe3O4@SiO2-N2 and Fe3O4@SiO2-N3 nanoparticles. Additionally, Pb2+ was not bound by Fe3O4@SiO2-N3. The research results show that the Fe3O4@SiO2-N3 nanoparticles bind copper ions with high selectivity. For the first time we performed the adsorption-desorption experiments using DPASV to prove the Cu2+ binding activity of Fe3O4@SiO2-N3 nanoparticles. Obtained results indicate that examined nanoparticles show strong binding capability. Additionally, we obtained 99.9% recovery of Cu2+ ions.

Authors

• Amanda Kulpa,
• dr hab. inż. Jacek Ryl link open in new tab ,
• Grzegorz Schroeder,
• Adrian Koterwa,
• dr hab. med. Jacek Sein Anand,
• prof. dr hab. inż. Tadeusz Ossowski,
• Dr Paweł Niedziałkowski