EDTA functionalized magnetic nanoparticle as a multifunctional adsorbent for Congo red dye from contaminated water

摘要

The present work reports the applicability of magnetite iron nanoparticles (Fe_3O_4) functionalized with ethylenediaminetetraacetic acid (EDTA) as an efficient adsorbent for the removal of Congo red (CR) dye from contaminated water. Magnetic nanoparticles (Fe_3O_4) are prepared by chemical precipitation method in which Fe~(2+) and Fe~(3+) salt from aqueous solution were reacted in presence of ammonia solution. The surface of Fe_3O_4 nanoparticle was first coated with (3-aminopropyl) triethoxy silane (APTES) by a salinization reaction and then linked with EDTA via reaction between -NH_2 and -COOH to form well dispersed surface functionalised biocompatible magnetic nanoparticles. The obtained EDTA functionalized magnetic nanoparticles are characterized in terms of their morphological, XRD, BET surface area analysis, Fourier transform infrared spectroscopy (FT-IR) and Vibrating sample magnetometer (VSM). The adsorption of CR on Fe_3O_4-APTESEDTA nanocomposite corresponds well to the Langmuir model and the Freundlich model respectively. The adsorption processes for CR followed the pseudo-second-order model.