Synthesis and application of Amberlite xad-4 functionalized with alizarin red-s for preconcentration and adsorption of rhodium (III)

Abstract

A new chelating resin was prepared by coupling Amberlite XAD-4 with alizarin red-s through an azo spacer, characterized by infra-red spectroscopy and thermal analysis and studied for Rh(III) preconcentration using inductively coupled plasma atomic emission spectroscopy (ICP-AES) for rhodium monitoring in the environment. The optimum pH for sorption of the metal ion was 6.5. The sorption capacity was found 2.1 mg/g of resin for Rh(III). A recovery of 88% was obtained for the metal ion with 1.5 M HCl as eluting agent. Kinetic adsorption data were analyzed by adsorption and desorption times of Rh(III) on modified resin. Scat chard analysis revealed that the homogeneous binding sites were formed in the polymers. The linear regression equation was Q/C = –1.3169Q + 27.222 (R2 = 0.9239), for Rh were formed in the SPE sorbent,Kd and Qmax for the affinity binding sites were calculated to be 0.76 μmol/mL and 20.67 μmol/g, respectively. The equilibrium data and parameters of Rh(III) adsorption on modified resin were analyzed by Langmuir, Freundlich, Temkin and Redlich–Peterson models. The experimental adsorption isotherm was in good concordance with Langmuir and Freundlich models (R2 > 0.998) and based on the Langmuir isotherm the maximum amount of adsorption (qmax) was 4.842 mg/g. The method was applied for rhodium ions determination in environmental samples. with high recovery (>80%).

A new extractant impregnated resin for separation of traces of uranium and thorium followed by their spectrophotometric determination in some geological samples

“…The band of OH becomes weak and less intense due to the interaction with U and Th ions. As a result, we can say that the ketonic and phenolic groups are coordinated to the U and Th ions and the result agreed with that reported earlier [22,46,50,74,75] which indicate that sorption of uranium and thorium takes place through complexation with ARS loaded on the resin and that amberlite XAD 2010 is applied only as an immobilization substrate for ARS reagent.…”

“…The bands at 2924 and 1632 cm −1 are assigned to the aliphatic -CH 2 -CH 2 chains and the phenyl rings, respectively [46][47][48][49]. Upon modification with ARS, the phenolic-OH band appears at 3432 cm −1 [46,50]. The most noticeable change in the spectra is the band at 1266 and 1159 cm −1 which are due to the stretching SO 3 2− and C-S band at 585 cm −1 [46,51].…”

Amberlite XAD-2010 Impregnated with Chrome Azurol S for Separation and Spectrophotometric Determination of Uranium and Thorium

“…The spectra showed new bands of the complexes in the lower frequency range which were assigned as ν(M-O) [77]. As a result, we can say that the ketonic and phenolic groups are coordinated to the U and Th ions and the result agreed with that previously reported [29,[78][79][80][81][82] which indicates that adsorption of uranium and thorium takes place through complexation with CAS loaded on the resin and that Amberlite XAD 2010 is applied only as an immobilization substrate for CAS reagent.…”

Recovery of Uranium(VI) from Sulfate Leach Liquor using Modified Duolite

“…The bands appeared at 3779.25 and 3407.07 cm –1 are attributed to OH stretching vibration of alcohol and OH of carboxylic , . The peak at 3021.41cm –1 is related to Ar–H stretching.…”