Adsorption of Cu2+ from aqueous solution by a novel material; azomethine functionalized magnetic nanoparticles

作者：Ojemaye Mike O; Okoh Omobola O; Okoh Anthony I

来源：Separation and Purification Technology, 2017, 183: 204-215.

DOI：10.1016/j.seppur.2017.02.055

• Magnetic nanoparticles
• Adsorption
• Aqueous solution
• Schiff base
• Functionalization
• Cu2+

In this report, a novel functionalized magnetic nanoparticles (MNP-Maph) synthesized via covalent grafting of 4-([(E)-phenylmethylidene]amino)benzoic acid (Maph-COOH) onto the surface of amine functionalized magnetic nanoparticles (MNP-NH2) was characterized and assessed for the removal of heavy metal ion Cue} from aqueous solution by adsorption. To afford MNP-Maph, Maph-COOH was first synthesized and covalently linked to MNP-NH2. FTIR and XRD analysis showed that MNP-Maph was successfully synthesized while TEM and XRD results revealed that the average size of the synthesized particles were in the range of 18 +/- 5 nm. Time-dependent adsorption studies conducted at pH 5 showed that Cu2+ removal by MNP-Maph attained equilibrium within 45 min at different initial adsorbate concentrations and favoured pseudo second-order kinetic model. MNP-Maph showed remarkable sorption uptake (qe) of Cu2+ as adsorbate temperature increases from 293 to 318 K and Langmuir isotherm best describes the adsorption process. Thermodynamic study revealed the spontaneity and randomness of the adsorption process. Regenerability experiment indicates that MNP-Maph exhibit excellent adsorption/desorption efficiency and will be good for re-use. Importantly, MNP-Maph was found to effectively and selectively remove Cu2+ from domestic and industrial wastewater containing multiple ions and organic contaminants, suggesting that MNP-Maph can serve as a potential and promising adsorbent for the removal of Cu2+ from wastewater.

• 出版日期2017-8-7