Novel magnetic ion imprinted polymer as a highly selective sorbent for extraction of gold ions in aqueous samples

Abstract

In this work a novel ion imprinted polymer (IIP), based on dipyridyl amine-coated Fe 3 O 4 nanoparticles (NPs), was synthesized as a novel magnetic sorbent for rapid extraction, preconcentration and determination of trace amounts of gold ions. This was characterized by IR spectroscopy, scanning electron microscopy (SEM), elemental analysis (CHN) and thermal analysis (TGA/DSC). The optimum conditions, including pH of sample, eluent type and concentration and also the least amount of eluent necessary for desorption of gold ions and the time of adsorption were obtained. The effect of various cationic interferences on the adsorption of gold, specifically Pt(II) and Pd(II) ions, were evaluated. The analytical efficiency and relative standard deviation values for the determination of gold ions were 98.6% and 1.08, respectively, under the optimum conditions. The limit of detection (LOD) was 0.43 ng mL À1 for gold extraction. The maximum capacity of the IIP modified magnetic nanoparticles was found to be greater than 76 mg g À1 . Furthermore, the accuracy of this method was confirmed using various standard materials. This method was also applied successfully for preconcentration and determination of gold ions in some real samples.

Magnetic Adsorbents for the Recovery of Precious Metals from Leach Solutions and Wastewater

“…A novel magnetic sorbent, an ion imprinted polymer(IIP) was synthesized and studied by Ebrahimzadeh et al (2012) [83] for the speedy extraction, preconcentration and determination of trace amounts of gold ions. The effects of sample pH, adsorption time, type of eluent, eluent concentration and minimum volume required for desorption of gold ions were determined.…”

One-Pot Synthesis of Novel Derivatives of Dithioxopyrido[2,3-d:6,5-d’]dipyrimidine-4,6-diones Using Hap-Encapsulated γ-Fe2O3 Supported Sulfonic Acid Nanocatalyst

“…The relatively large surface area and highly active surface sites of nanoparticles enable them to have a wide range of potential applications. Magnetic iron oxide nanoparticles (MNPs) as a new kind of nanometer-sized material, have multiple practical applications, such as chemistry, physics, medicine, and biology due to their multifunctional properties such as small size, superparamagnetism, high reactivity, low toxicity and high thermal and mechanical stability [1][2][3][4]. Additionally, the magnetic properties make the recovery of the catalyst easy by mean of an external magnetic field [5,6].…”

Determination of optimal adsorption-desorption conditions for selective removal of Ni(II) from petrochemical samples using ion imprinted nanosorbent

“…In this technique, a complex is formed through the assembly of ionic species and especial functional monomer and then is polymerized with the monomer to give the corresponding sorbent. Cavities as templates, proper for the size and shape of the analyte, are formed in the polymer matrix upon the removal of the imprinted ion [18][19][20][21]. The IIP have been used for chromatography, sensors (such as voltammetric or potentiometric) and solid phase extraction [22][23][24][25].…”