Synthesis of graphene oxide nanoribbons/chitosan composite membranes for the removal of uranium from aqueous solutions
Xuewen Hu , Yun Wang , Jinbo Ou Yang , Yang Li , Peng Wu , Hengju Zhang , Dingzhong Yuan , Yan Liu , Zhenyu Wu , Zhirong Liu
Front. Chem. Sci. Eng. ›› 2020, Vol. 14 ›› Issue (6) : 1029 -1038.
Synthesis of graphene oxide nanoribbons/chitosan composite membranes for the removal of uranium from aqueous solutions
In this study, a graphene oxide nanoribbons/chitosan (GONRs/CTS) composite membrane was successfully prepared by encapsulating CTS into GONRs, which were unzipped from multi-walled carbon nanotubes. The GONRs/CTS composite membrane so prepared was characterized using scanning electron microscopy, X-Ray diffraction and Fourier transform infrared spectroscopy. The effects of the experimental conditions such as the pH (2‒7), adsorbent dosage (10‒50 mg), experimental time (5 min–32 h), uranium concentration (25‒300 mg∙L−1), experimental temperature (298 K‒328 K) on the adsorption properties of the composite membrane for the removal of U(VI) were investigated. The results showed that the U(VI) adsorption process of the GONRs/CTS composite membrane was pH-dependent, rapid, spontaneous and endothermic. The adsorption process followed the pseudo-secondary kinetics and Langmuir models. The maximum U(VI) adsorption capacity of the GONRs/CTS composite membrane was calculated to be 320 mg∙g−1. Hence, the GONRs/CTS composite membrane prepared in this study was found to be suitable for separating and recovering uranium from wastewater.
graphene nanoribbons / chitosan / U(VI) / adsorption
Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature
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