preconcentration of trace amount Zn ( II ) using organic - solution - process able functionalized - grapheme

A novel and selective method for the fast determination of trace amounts of Zn(II)ions in water samples has been developed. The first organic-solution-processable functionalized-graphene (SPFGraphene) hybrid material with porphyrins. porphyrin–graphene nanohybrid, 5-4 (aminophenyl)-10, 15, 20-triphenyl porphyrin and its photophysical properties including optical (TPP) and grapheme oxide molecules covalently bonded together via an amide bond (TPPNHCO-SPFGraphene) were used as absorbent for extraction of Zn(II) ions by solid phase extraction method. The complexes were eluted with HNO3 (2M)10% V.V -1 mthanol in acetone and determined the analyte by flame atomic absorption spectrometry. The procedure is based on the selective formation of Zn(II) at optimum pH by elution with organic eluents and determination by flame atomic absorption spectrometry.The method is based on complex formation on the surface of the ENVI-18 DISK TM disks modified porphyrin–graphene nanohybrid, 5-4 (aminophenyl)-10, 15, 20-triphenyl porphyrin (TPP) and grapheme oxide molecules covalently bonded together via an amide bond (TPP-NHCO-SPFGraphene) followed * Correspondence should be addressed to Ali Moghimi, Department of Chemistry, Varamin (Pishva) Branch Islamic Azad University, Varamin, Iran. Email: [email protected]. Journal of science and today's world 2012, volume 1, issue 1, pages: 40-53 41 | P a g e by stripping of the retained species by minimum amounts of appropriate organic solvents. The elution is efficient and quantitative. The effect of potential interfering ions, pH, TPP-NHCOSPFGraphene, amount, stripping solvent, and sample flow rate were also investigated. Under the optimal experimental conditions, the break-through volume was found to about 1000mL providing a preconcentration factor of 600. The maximum capacity of the disks was found to be 398± 3 μg for Zn 2+ .The limit of detection of the proposed method is 5ng per 1000mL.The method was applied to the extraction and recovery of Zn in different water samples.