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| Carbon-nitrogen Structure Hollow Tube Material and its Adsorption Performance for Thorium Ions |
| Received:April 23, 2021 Revised:June 21, 2021 |
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| DOI：10.7643/issn.1672-9242.2021.12.014 |
| KeyWord:carbon-nitrogen structure hollow tube nitrogen doping thorium ion adsorption |
| Author | Institution |
| ZHOU Xin-hao |
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing , China;Jiangsu Key Laboratory of Chemical Pollution Control and ResourcesReuse, Nanjing , China |
| CHEN Jiu-yu |
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing , China;Jiangsu Key Laboratory of Chemical Pollution Control and ResourcesReuse, Nanjing , China |
| TANG An-yu |
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing , China;Jiangsu Key Laboratory of Chemical Pollution Control and ResourcesReuse, Nanjing , China |
| YANG Yi |
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing , China;Jiangsu Key Laboratory of Chemical Pollution Control and ResourcesReuse, Nanjing , China |
| LIU Ying |
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing , China;Jiangsu Key Laboratory of Chemical Pollution Control and ResourcesReuse, Nanjing , China |
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| Abstract: |
| This paper aims to synthesize carbon-nitrogen structure hollow tube material for the adsorption and removal of radioactive thorium ions produced in rare earth mines. Through melamine and cyanuric acid supramolecular self-assembly, carbon-nitrogen structure hollow tube material was prepared by hydrothermal carbonization and high temperature pyrolysis and analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Thorium ion adsorption experiments were carried out at different pyrolysis temperatures and pH, and the difference in adsorption capacity under different initial concentrations of thorium ions and adsorption time was compared. The morphology of the material was a uniform hollow tubular structure at 600 ℃. When pH=3.5 and pyrolysis temperature is 800 ℃, the maximum adsorption capacity reached 133.87 mg/g. The adsorption process conforms to the Langmuir isotherm adsorption model and follows the Pseudo-second-order kinetics model. The carbon-nitrogen structure hollow tube material has a good adsorption effect on thorium ions, which is expected to be used in the removal of thorium ions in radioactive wastewater generated by rare earth mining. |
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