Preparation of Amidoxime-Based Nylon-66 Fibers for Removing Uranium from Low-Concentration Aqueous Solutions and Simulated Nuclear Industry Effluents

Abstract

Amidoximated nylon-66 fiber containing double amidoxime groups per repeating unit (coded as PA66-g-PGMA-IDPAO) for the purpose of removing low uranium concentrations (1–25 mg/L) from aqueous solutions and application in simulated nuclear industry effluents was prepared by a simultaneous radiation-induced emulsion graft polymerization method. It was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, and single fiber tensile strength tester. Batch adsorption experiments were conducted to investigate the effect of initial pH, sorption isotherm, adsorption kinetics, and thermodynamics. It was found that the optimum initial pH is 5.0. The sorption isotherm followed the Langmuir isotherm. The adsorption kinetics fit the pseudo-second-order model. The thermodynamics parameters revealed that the adsorption process was spontaneous and endothermic. The sorption test performed in a simulated nuclear industry effluent demonstrated a high adsorption efficiency (about 91.3%) and selectivity for uranium.

Enhanced Performance in Uranium Extraction by Quaternary Ammonium-Functionalized Amidoxime-Based Fibers

“…The diameter of the AN fibers and AO fibers increased dramatically due to the grafting of P(AN-co-AAc) and the amidoximation of the grafted material. 36,40 It could be clearly observed that UHMWPE fibers, AN fibers, and AO fibers all exhibited a smooth surface (Figure 2A−C). However, after the RIGP of DMAEMA, nanoparticles with a size of 100 nm were formed on the surface of the AN-DMAEMA fibers (Figure 2D).…”

“…The absorbed dose was 80 kGy. The irradiated UHMWPE fibers were placed into a flask containing 50 vol % AN, 13 vol % AAc, and 37 vol % DMF, after purging with nitrogen for 30 min for deoxygenation. , Graft polymerization was performed at 50 °C. After 5 h, the samples were washed with DMF and deionized water four times.…”

Trace Zinc-Preload for Enhancement of Uranium Adsorption Performance and Antifouling Property of AO-Functionalized UHMWPE Fiber

“…The adsorption peaks at 1652 and 1558 cm −1 belonging to CN and COO − group, 23,48 respectively, had no shift in wavenumber after preloading zinc, but the intensity of COO − at 1558 cm −1 shows a slight decrease in contrast with the intensity of CN at 1652 cm −1 . 49 The result suggested that the ion-pair between the zinc ion and the carboxylic group was formed, thus the electron density of carboxylic group was shielded by the ion-pair after zinc preloading.…”

Expeditious synthesis of covalent organic frameworks: a review

“…Notably, UV irradiation drastically enhanced the growth rate of UV-COF-5 The past decade has witnessed the surge of highenergy ionizing radiations as energy sources for the synthesis of diverse functional materials. [64][65][66] Most recently, Wang's group developed an electron beam irradiation-induced synthesis of imine-linked 2D COFs with exceptional synthetic rates and generality (Fig. 3).…”