ILSnCl2-mGO nanocomposite for efficient preconcentration of Red 2G via ultrasonic-assisted dispersive magnetic solid-phase extraction method: isotherm adsorption

This article aims at Red 2G (R2G) preconcentration via dispersive magnetic solid-phase extraction, prior to its determination by a UV-visible spectrometer. The adsorbent (ILSnCl2-mGO) was made of Fe3O4, graphene oxide and deep eutectic solvent (DES). R2G has pi-pi and electrostatic interactions with carbonic-based adsorbents, especially graphene oxide, which has conjugated structure, high surface area and hetero atom of oxygen. An important trick in this method is applicability of DES, boosting the adsorption potential. DES of [Hmim][BF4] and SnCl2 was prepared at 60 degrees C, followed by adding magnetic graphene oxide. Magnetization facilitates the separation steps and decreases the preconcentration time. ILSnCl2-mGO was characterized by Fourier transform infrared spectroscopy, X-ray diffractometry and alternative gradient force magnetometer. The maximum performance was achieved in pH of 3 +/- 0.5, ILSnCl2-mGO amount of 1.0 x 10(-2) g, disperser of acetone (0.75 ml), adsorption time of 10 s, eluent of ethanol (1 ml) and desorption time of 2 min. The procedure was operated at room temperature in an ultrasonic bath. The waves decrease the time of preconcentration and usage amounts of materials. Linearity of dynamic range (5.0 x 10(-6)-25 x 10(-5) g l(-1)), limit of detection (12 x 10(-7) g l(-1)), preconcentration factor (50), the relative standard deviations (5.4%), reusability and effect of interference ions verify the accuracy and validity of ILSnCl2-mGO. Ten two-parameter isotherm models investigated the nature of adsorption. The method was effectively practical to quantify R2G in fruit juice and water samples.

Automated summary

This study focuses on the preconcentration of Red 2G (R2G) using dispersive magnetic solid-phase extraction, followed by determination using a UV-visible spectrometer. The use of a magnetic adsorbent (ILSnCl2-mGO) made of Fe3O4, graphene oxide, and deep eutectic solvent (DES) enhances the adsorption potential of R2G. The magnetization of graphene oxide facilitates separation and reduces preconcentration time. The results demonstrate the feasibility of this method for quantifying R2G in fruit juice and water samples.