Amidoxime modified polyacrylonitrile fiber (AO-PANF) was prepared by reacting polyacrylonitrile fiber (PANF) as fundamental materials with hydroxylamine hydrochloride. The chelation behavior of AO-PANF to uranium from wastewater containing uranium in the presence of fluoride and chlorine with high concentration was investigated by Scanning Electron Microscopy

Fourier Transform Infrared Spectra and batch adsorption. The results showed that nitrile groups were successfully transformed into amidoxime groups by the amidoximation reaction. The conversion rate of nitrile groups increased with the increasing concentration of hydroxylamine hydrochloride. The adsorption quantity of uranium reached up the largest value when the conversion rate of nitrile group was 22.34%. The adsorption quantity of AO-PANF to uranium increased and then decreased with increasing pH

and the maximum adsorption quantity was obtained at pH 5. The concentrations of both F- and Cl- have little effect on the adsorption quantity of AO-PANF to uranium. The maximum adsorption quantity of AO-PANF (22.34% conversion rate of nitrile groups) to uranium in 100 ml wastewater (100 mg·L-1 initial concentration of uranium) was 19.53 mg·g-1 under the condition of pH 5

45℃ and 0.40 g adsorbent dose

and the adsorption experiment reached equilibrium after 3 h. AO-PANF adsorbed uranium through chelation between the -NH2 of amidoxime groups and UO2F42- of wastewater. The adsorption process conformed to Freundlich isothermal adsorption model and pseudo-second order kinetic equation. It was shown that AO-PANF can effectively extract uranium from wastewater containing uranium in the presence of fluoride and chlorine with high concentration

and has a promising application prospect.