title: Solid phase extraction of Cu2+, Ni2+, and Co2+ ions by a new magnetic nano-composite: excellent reactivity combined with facile extraction and determination.
abstract: In the present study, silica magnetite mesoporous nanoparticles functionalized with a new chelating agent were synthesized and introduced as a magnetic solid phase for preconcentration of trace amounts of Cu2+, Ni2+, and Co2+ ions from aqueous solutions. Briefly, MCM-41 mesoporous-coated magnetite nano-particles (MMNPs) with particle size lower than 15 nm were synthesized via chemical co-precipitation methods. Then, N-(4-methoxysalicylidene)-4,5-dinitro-1,2-phenylenediamine (HL) as a new chelating agent was synthesized and used for surface modification of mesoporous magnetic solid phase by dispersive liquid-liquid functionalization (DLLF) as a new rapid method to form HL functionalized mesoporous magnetite nanoparticles (MMNPs─HL). The structure and morphology of prepared sorbent were characterized by FT-IR, XRD, VSM, and TEM. Finally, the prepared nanoparticles were utilized for preconcentration of Cu2+, Ni2+, and Co2+ ions prior to determination by atomic absorption spectrophotometery. The calibration graph was obtained under the optimized conditions with linear dynamic range of 1.0-300 μg L(-1) and correlation coefficient (r2) of 0.998. The detection limits of this method for cobalt, nickel, and copper ions were 0.03, 0.03, and 0.04 ng/mL, respectively. Finally, the method was successfully applied to the extraction and determination of the analyte ions in natural waters and reference plant samples.
authors.affiliation: Young Researchers and Elite Club, Lahijan Branch, Islamic Azad University, Lahijan, Iran.
authors.forename: Parastou
authors.initials: P
authors.lastname: Azizi
authors.forename: Mostafa
authors.initials: M
authors.lastname: Golshekan
authors.forename: Shahab
authors.initials: S
authors.lastname: Shariati
authors.forename: Jalal
authors.initials: J
authors.lastname: Rahchamani
mesh_terms: D003035:Cobalt / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D004784:Environmental Monitoring / Q000379:methods; D052203:Ferrosoferric Oxide; D007477:Ions; D060328:Magnetic Phenomena; D008280:Magnetics; D058185:Magnetite Nanoparticles / Q000737:chemistry; D009532:Nickel / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D052616:Solid Phase Extraction / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D007477:Ions; C509968:MCM-41; D058185:Magnetite Nanoparticles; D014874:Water Pollutants, Chemical; D003035:Cobalt; D012822:Silicon Dioxide; D003300:Copper; D009532:Nickel; D052203:Ferrosoferric Oxide