August 2014 Vol.2 No.5

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Original Research Article

Preconcentration of trace Ni (II) using C₁₈ disks nano graphene with aminopropyltriethoxysilane (APTES)

Ali Moghimi¹* and Mohammad Yari²

¹Department of Chemistry, East Tehran (Qiam Dasht) Branch. Islamic Azad University Tehran, Iran
²Department of Chemistry, Eslamshahr Branch . Islamic Azad University Eslamshahr, Iran

*Corresponding Author Email: alimoghimi@iauvaramin.ac.ir; kamran9537@yahoo.com

Accepted August 29, 2014

Abstract

A selective and simple method has been developed for preconcentration of Ni on C₁₈ disks nano graphene with aminopropyltriethoxysilane (APTES). Simple chemical bonding method to synthesize nano graphene with aminopropyltriethoxysilane (APTES) was reported. The adsorption behaviors of Ni (II) in aqueous solution on APTES were systematically investigated. The procedure is based on the selective formation of Ni (II) at optimum pH by elution with organic effluents and determination by flame atomic absorption spectrometry. The method is based on complex formation on the surface of the ENVI-18 DISK^TM disks nano graphene with amino propyltriethoxysilane (APTES) followed 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, APTES 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 disk nano graphene with aminopropyltriethoxysilane (APTES) was found to be 398± 3 µg for Ni²⁺. The limit of detection of the proposed method is 5mg per 1000mL.The method was applied to the extraction and recovery of Ni in different water samples.

Keywords: Ni (II), SPE, Octadecyl silica disk, FAAS, nano graphene with aminopropyltriethoxysilane (APTES)