Removal of Cd2+ and Zn2+ from industrial wastes using novel magnetic N2,N6-di(thiazol-2-yl)pyridine-2,6-dicarboxamide nanoadsorbent

Abstract

In this workN²,N⁶-di(thiazol-2-yl)pyridine-2,6-dicarboxamide (DPD), was synthesized via reaction of 2-aminothiazole and 2,6- pyridinedicarboxylic acid in n-methylpyrrolidine. The obtained (DPD) was characterized with nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared (FT-IR) spectroscopy, and elemental analysis. Finally, a novel magnetic nanoadsorbent was synthesized by modification the surface of Fe₃O₄ nanoparticles by N²,N⁶-di(thiazol-2-yl)pyridine-2,6-dicarboxamide. The prepared magnetic nanoadsorbent was successfully used for removal of Zn²⁺ and Cd²⁺ ions from industrial wastes and the effects of the affecting parameters such as pH, possible interfering ions, contact time, concentration of target ions, background electrolytes and temperature were investigated. The maximum adsorption capacities of Zn²⁺ and Cd²⁺ were found to be 149.2 and 112.4 mg g⁻¹, respectively. The required times for quantitative removal of Zn²⁺ and Cd²⁺ were 30 and 45 min, respectively. Appropriate characteristics of the proposed nanoadsorbent such as high adsorption capacity, stability, reusability, easy synthesis and easy separation, make it suitable adsorbent for practical removal of Zn²⁺ and Cd²⁺ ions from industrial wastes.<span id="transmark" style="display: none; width: 0px; height: 0px;"></span>