Determination of Copper, Iron, Nickel and Zinc in fuel kerosene by FAAS after adsorption and pre-concentration on 2-aminothiazole-modified silica gel

Abstract

Silica gel chemically modified with 2-Aminotiazole groups, abbreviated as SiAT, was used for preconcentration of copper, zinc, nickel and iron from kerosene, normally used as a engine fuel for airplanes. Surface characteristics and surface area of the silica gel were obtained before and after chemical modification using FT-IR, Kjeldhal and surface area analysis (B.E.T.). The retention and recovery of the analyte elements were studied by applying batch and column techniques. The experimental parameters, such as shaking time in batch technique, flow rate and concentration of the eluent (HCl-0.25-2.00 mol L -1 ) and the amount of silica, on retention and elution, have been investigated. Detection limits of the method for copper, iron, nickel and zinc are 0.77, 2.92, 1.73 and 0.097 mg L -1 , respectively. The sorption-desorption of the studied metal ions made possible the development of a preconcentration method for metal ions at trace level in kerosene using flame AAS for their quantification.

Chemical Oxidative Polymerization of 2-Aminothiazole in Aqueous Solution: Synthesis, Characterization and Kinetics Study

“…2-Aminothiazole (AT) is a heterocyclic amine combining the chemical structures of aniline, pyrrole and thiophene. Owing to the existence of sulfur- and nitrogen-rich subgroups, AT and its derivatives demonstrated excellent adsorption properties to heavy metal ions [ 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. For example, AT-modified silica gels were able to adsorb and preconcentrate Ni(II), Cu(II), Cd(II), Zn(II) and Pb(II) [ 7 ]; also, AT-functionalized polyacrylonitrile and polystyrene exhibited an excellent selectivity for adsorption of Hg(II) and Au(III) ions in aqueous solution [ 8 ].…”

Simple synthesis of conducting poly(2-aminothiazole) with high molecular weight

“…It was reported that 2AT and its derivatives demonstrated excellent anticorrosive properties [4] and adsorptive functionalities to heavy metal ions due to the sulfur (S)-and nitrogen (N)-rich subgroups [5,6]. 2AT-modified silica gel and TiO 2 particles were reported to be able to remove heavy metal ions including Ni(II), Cu(II), Cd(II), Zn(II), and Pb(II) from fuel kerosene [7], fuel ethanol [8], and aqueous solutions [9][10][11], respectively. Recently, it was reported that 2AT-functionalized polyacrylonitrile resin enabled separation and preconcentration of Hg(II) from multicomponent solutions containing Ni(II), Cu(II), Cd(II), Zn(II), and Pb(II) [12].…”

Tuning the Size of Thermoresponsive Poly(N-Isopropyl Acrylamide) Grafted Silica Microgels

“…Additionally, Fourier transformed infrared spectroscopy (FTIR) confirms the presence of TPM bound to the silica surface (Figure 1b). From the silica a broad and almost featureless band is visible between 2500 and 3800 cm −1 , corresponding to the stretching vibrations of the surface silanols Si-OH perturbed by hydrogen, bonding either intramolecularly or with adsorbed water [30]. For the TPM-modified silica particles, additionally two small bands are visible between 2800 and 3000 cm −1 from the stretching vibration of C-H bonds.…”