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      저자 : E.M.S. Azzam (검색결과 2 건)
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        Enhancement the detection of Ni2+ and Zn2+ ions using nanostructure of synthesized dithiol surfactants with gold nanoparticles

        E.M.S. Azzam,A.F.M. El-Farargy,Ali A. Abd-Elaal 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5

        Here in, the nanostructure of dithiol surfactants were synthesized with gold nanoparticles (AuNPs). The nanostructure of these surfactants was investigated using FTIR, UV, XRD, and TEM techniques. The surfactants under investigation show good ability for assembling on AuNPs. The alkyl chain length shows strong effect on the stabilization of the nanostructure of these surfactants. The detection of Ni2+ and Zn2+ ions in water solution was investigated using UV spectrophotometer. The data show that the sensitivity of the nanostructure of surfactants towards the detection of Ni2+ and Zn2+ ions is more than that of the individual surfactants.

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        Zinc(II) modified carbon paste electrodes based on self-assembled mercapto compounds-gold-nanoparticles for its determination in water samples

        Tamer Awad Ali,E.M.S. Azzam,M.A. Hegazy,A.F.M. El-Farargy,Ali A. Abd-Elaal 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5

        In the present study newly developed potentiometric sensors for determination of zinc(II) are presented. The proposed potentiometric method was based on the fabrication of modified carbon paste (MCPE; electrode X) and modified gold nanoparticles-carbon paste (GNPs-CPE; electrode IX) sensors. A mercapto compound of 1,4-bis(5-mercaptopentyloxy)-benzene (BMPB) alone or self-assembled on gold nanoparticles was used as modifier to construct electrode (X) and electrode (IX) sensors, respectively. The prepared electrodes exhibit Nernstian slope of 29.93 ± 0.4 and 26.0 ± 1.02 mV decade-1 towards Zn(II) ion over a wide concentration range of 6.8 × 10-10 to 2.9 × 10-2 and 1.0 × 10-7 to 1.0 × 10-2 mol L-1 for electrode (IX) and electrode (X) sensors, respectively. The limit of detection of the electrode (IX) and electrode (X) sensors was found to be 6.8 × 10-10 and 1.0 × 10-7 mol L-1, respectively. The potentiometric response of the electrode (IX) and electrode (X) based on GNPs-BMPB and BMPB are independent of pH of test solution in the pH range of 2.5–8.1 and 3–7 with a response time of 6 and 8 s for electrode (IX) and electrode (X) sensors, respectively. The proposed sensors showed fairly good discriminating ability towards Zn(II) ion in comparison with many hard and soft metal ions. Finally, the proposed electrodes were successfully used as indicator electrodes in potentiometric titration of zinc ion with sodium tetraphenylborate (NaTPB) and in direct determination of Zn(II) ion in some water samples. The results obtained compared well with those obtained using atomic absorption spectrometry.

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