Dispersive solid-phase extraction for preconcentration of colored effluent in aqueous samples using magnetic carbon nanotubes modified with chitosan

Document Type : Original Article

Authors

• ali moghimi ¹
• Milad Abniki ²

¹ Associated professor analytical chemistry Department of Chemistry, Varamin( Pishva )Branch Islamic Azad University, Varamin, Iran

² Department of Chemistry, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran

Abstract

In this study, a new technique of solid-phase extraction by chitosan-modified magnetic carbon nanotubes was used for small amounts of colored effluent as an indicator of bromocresol green in aqueous samples and measured by UV-VIS spectroscopy. This technique is a two-phase system in which the donor phase is aqueous samples containing bromocresol green and the acceptor phase is the chitosan-activated magnetic carbon nanotubes. The experiments were performed in two stages of extraction from aqueous samples and desorption of bromocresol green dyes using ethanol solvent and then the desorbed samples were analyzed via UV-Vis spectrophotometry. This method is cheap, simple, fast, and compatible with many existing device methods. Extraction parameters such as the effect of organic solvent and adsorbent, pH of donor and acceptor phases, extraction time, stirring speed, volume of the donor were optimized and quantitative studies and measurements were performed under these optimal conditions. This technique has many advantages such as; short extraction time, low consumption of organic solvents, elimination of the effect of previous tests, low detection limit and high concentration factor. Acceptable values for concentration and diagnostic factors have been obtained for the extraction of bromocresol green dyes.

Keywords

• preconcentration of colored effluent
• dye extraction
• magnetic nanocomposite
• dispersive solid-phase extraction

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