Solid-Phase Extraction Method by Magnetic Nanoparticles Functionalized with Murexide for Trace U(VI) from Sea Water Prior to Spectrophotometric Determination

Abstract

In this study, magnetic nanoparticles (Fe 3 O 4 /SiO 2 /APTES) functionalized with murexide were used for the determination of uranium(VI) in sea water by spectrophotometric method in perchloric acid medium using Arsenazo-III as chromogenic reagent. The effects of some analytical parameters, such as pH, contact time, and eluent volume, on the recovery of uranium(VI) were examined in synthetic sea water. The optimum conditions were achieved with a 15 min adsorption time and 2 min elution time with 1 mL of 5 mol L-1 HClO 4 at pH of 6.5 and 25 mg of the magnetic sorbent. The linear range, detection limit, and precision (as RSD%) of the method were found to be 0.02-4.0 mg L-1 , 0.001 mg L-1 and 3.0%, respectively. The proposed method is simple, rapid, and cost-effective for the determination of U(VI) in sea water, with a total analysis time of approximately 30 min. The adsorption isotherm was well fitted to the Langmuir model, with a correlation coefficient of 0.9997 and Q max value was found to be 77.51 mg g-1. The magnetic sorbent was successfully used for the rapid determination of trace quantities of U(VI) ions in different sea waters, and satisfactory results were obtained.

Efficient separation and recovery of Re(VII) from Re/U bearing acidic solutions using aminotriazole modified cellulose microsphere adsorbents

“…Various methods have been applied for recovery of Re(VII), including solvent extraction (Cheema et al 2018;Hong et al 2020), liquid membrane (Zhang et al 2017) and precipitation (Oymak 2019;Hong et al 2020); however, the solvent used for solvent extraction is toxic and ammable, the liquid membrane has a low stability, and the post-processing of the precipitation method is complicated, all of which greatly restrict their further applications (Seo et al 2012;Shan et al 2019). Adsorption has become increasingly popular as its operation is easy, low-cost, and particularly suitable in practical situations involving low concentrations of Re(VII) (Lou et al 2013).…”