Synthesis of graphene oxide nanoribbons/chitosan composite membranes for the removal of uranium from aqueous solutions
- PDF / 1,232,278 Bytes
- 10 Pages / 595.276 x 785.197 pts Page_size
- 83 Downloads / 219 Views
RESEARCH ARTICLE
Synthesis of graphene oxide nanoribbons/chitosan composite membranes for the removal of uranium from aqueous solutions Xuewen Hu3, Yun Wang (✉)1,3, Jinbo Ou Yang2, Yang Li3, Peng Wu3, Hengju Zhang3, Dingzhong Yuan1,2, Yan Liu1,2, Zhenyu Wu4, Zhirong Liu1 1 State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China 2 School of Chemical Biology and Materials Science, East China University of Technology, Nanchang 330013, China 3 School of Nuclear Science and engineering, East China University of Technology, Nanchang 330013, China 4 China Institute of Atomic Energy, Beijing 102413, China
© Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract 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 pseudosecondary 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. Keywords adsorption
1
graphene nanoribbons, chitosan, U(VI),
Introduction
With the population explosion and industrialization over Received June 26, 2019; accepted August 26, 2019 E-mail: [email protected]
the past few decades, energy demands have increased significantly. Since, fossil fuels are non-renewable, it is imperative to develop novel energy sources to meet the increasing energy demand. Compared to hydro and thermal powers, nuclear power is cost-effective, safe, and environmentally friendly. However, radioactive wastewater was generated during the mining and reprocessing of nuclear fuels. This wastewater is harmful for human health and the ecological environment [1]. Therefore, the effective treatment of uranium-containing radioactive wastewater is particularly important [2]. Various techniques such as ion exchange, extraction, precipitation, membrane filtration, coagulation and adsorption have been reported for the removal of U(VI) from wastewater [3‒10]. Among these, adsorption is the most widely used technique for wastewater treatment because of its high selectivity, cost-effectiveness, simple operation, low energy consumption and
Data Loading...
