Abstract
It is a challenge to improve the adsorption performance and service life of graphene oxide (GO) composite by introducing a macromolecular to manipulate the interlayer of GO to form a good water-endurable by intercalation. By virtue of high reactivity of amino group in the cross-linked network formed by poly(acrylamide) (pAM) and N,N′-methylenebisacrylamide (MBA), the layer space of GO was manipulated to acquire more efficient uranium adsorption of GO. Furthermore, the amino group can also increase coordinative binding interactions via providing a secondary coordination sphere, which adjusts the electron density of composites to lower the overall charge on U(VI) and provides an additional point allowing hydrogen bond to align U(VI) in a satisfactory coordination style. Herein, a high adsorption capacity and water-endurable of GO-pAM-MBA was constructed by interface manipulation on GO surface. The U-uptake capacity of GO-pAM-MBA was 984.2 mg g−1 (4.14 mmol g−1) in aqueous solutions, which was 1.6 times than that of pristine GO under same environment. The resultant adsorbent achieved a high adsorption amount of 5.42 mg g−1 in real uranium mine wastewater. Furthermore, GO-pAM-MBA displayed good water-endurable even after six cycles. Overall, the adsorption performance indicated that the GO-pAM-MBA was an excellent appropriate adsorbent for extracting uranium.
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