Magnetic nanoparticles modified by third-generation dendrimers (MNP-G3) and further modified by ethylenediaminetetraacetic acid (EDTA-MNP-G3) were conducted to investigate their ability for recovery of precious metals (Pd(IV), Au(III), Pd(II) and Ag(I)) in water. Experiments were carried out using batch reactors for the studies of adsorption kinetics, adsorption isotherms, competitive adsorption and regeneration test. Both Pd(IV) and Au(III) exhibited better adsorption efficiency than those with lower valence suggesting that the adsorption of precious metals by MNP-G3 is a function of valence. The maximum adsorption capacity determined by the Langmuir model for Pd(IV), Au(III), Pd(II) and Ag(I) is 36.9, 36.1, 27.6 and 28.6 mg/g. In the presence of the competing ion Zn(II), the adsorption efficiency of MNP-G3 was declined. The use of EDTA-MNP-G3 revealed an increase in the adsorption efficiency. The regeneration of metal-laden MNP-G3 can be performed by using 1.0% HCl solution.

Dendrimer modified magnetic nanoparticles for adsorption of precious metals

248th National Meeting (2014)

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