Exteraction of trace Zn (II) using C18 disks nano graphene with aminopropyltriethoxysilane (APTES)

A selective and simple method has been developed for preconcentration of Zn on C18 disksnano graphene with aminopropyltriethoxysilane (APTES). Simple chemical bonding methodto synthesize nano graphene with aminopropyltriethoxysilane (APTES) was reported. Theadsorption behaviors of Zn (II) in aqueous solution on APTES were systematicallyinvestigated. Zhang et al. reported the preparation of chemical bonded graphene coating forSPME in a layer-by-layer manner (Fig. 1A) [1]. The silica fiber was first treated with NaOHand 3- amino propyltriethoxysilane (APTES) to introduce amino groups to the surface. Then,GO was bonded to the fiber via reaction of the carboxyl groups of GO with the amino groups.Repeating the treatment with APTES and GO four times gave a coating of 20 lm thickness(Fig. 1D). Finally, the fiber was aged at 60°C and reduced with hydrazine. SEM showed arough tree-bark-like structure with a striped appearance (Fig. 1B), and the high-resolutionimage revealed a continuous folded, wrinkled structure (Fig. 1D).