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Published on: June 21, 2015
Nano zero valent iron encapsulated in graphene oxide for reducing uranium
Huiping Tang1, Wencai Cheng1, Yunpeng Yi2
1Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang, 621010, China; National Collaborative Innovation Center for Nuclear Waste and Environmental Safety, Southwest University of Science and Technology, Mianyang, 621010, China; School of National Defense Science & Technology, Southwest University of Science and Technology, Mianyang, 621010, China.
Nano zero-valent iron (Fe0) integrated with graphene oxide (GO) via 3-aminopropyl triethoxysilane (APTES) significantly enhances uranium (U(VI)) removal. The Fe0/APTES-GO composites show high stability and a remarkable removal capacity of 1357.99 mg/g.
Area of Science:
- Environmental Science
- Materials Science
- Nanotechnology
Background:
- Nano zero-valent iron (Fe0) is effective for Uranium (U(VI)) removal.
- Improving the stability and performance of Fe0 is crucial for practical applications.
- Graphene oxide (GO) offers a promising platform for material functionalization.
Purpose of the Study:
- To enhance the performance of nano zero-valent iron (Fe0) for Uranium (U(VI)) removal.
- To synthesize and characterize Fe0/APTES-GO composites.
- To investigate the stability and U(VI) removal capacity of the developed composites.
Main Methods:
- Fe0 nanoparticles were assembled onto graphene oxide (GO) sheets using 3-aminopropyl triethoxysilane (APTES).
- Characterization was performed using Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Energy Dispersive Spectrometer (EDS), X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), and X-ray Photoelectron Spectroscopy (XPS).
- Batch experiments were conducted to evaluate U(VI) removal efficiency and Fe2+ leaching.
Main Results:
- Fe0 particles were successfully encapsulated within rolled-up GO sheets, enhancing Fe0 stability.
- Minimal Fe2+ leaching was observed in the initial cycles.
- The Fe0/APTES-GO composites achieved a high U(VI) removal capacity of 1357.99 mg/g at pH 4.1 and 50 °C.
- Electrostatic potential calculations supported the U(VI) reduction mechanism.
Conclusions:
- Fe0/APTES-GO composites demonstrate superior stability and high efficiency for U(VI) removal compared to bare Fe0.
- The enhanced performance is attributed to the synergistic effects of Fe0's reducing activity and the functional groups on GO.
- These composites show significant potential for remediating uranium-contaminated water.
