Preparation of Porous Graphite Phase Carbon Nitride and Its Adsorption Property for U(Ⅵ)

GE Yujie; WU Jiao; WANG Guohua; ZHOU Shuai; LIU Jinxiang

doi:10.7538/yzk.2020.youxian.0310

Atomic Energy Science and Technology > 2021 > 55(4): 603-611. > DOI: 10.7538/yzk.2020.youxian.0310

GE Yujie, WU Jiao, WANG Guohua, ZHOU Shuai, LIU Jinxiang. Preparation of Porous Graphite Phase Carbon Nitride and Its Adsorption Property for U(Ⅵ)[J]. Atomic Energy Science and Technology, 2021, 55(4): 603-611. DOI: 10.7538/yzk.2020.youxian.0310

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Preparation of Porous Graphite Phase Carbon Nitride and Its Adsorption Property for U(Ⅵ)

School of Civil Engineering, University of South China, Hengyang 421001, China
Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang 421001, China

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Abstract

Porous graphite phase carbon nitride (PCN) was prepared by modifing graphite phase carbon nitride (g-C₃N₄) via thermal polymerization with melamine as raw material, and calcium carbonate as auxiliary template. The adsorption characteristics and effects of U(Ⅵ) by modified g-C₃N₄before and after modification were studied. Characterization methods such as SEM, BET, FT-IR and XPS were used to analyze the adsorption mechanism of the PCN for U(Ⅵ). The results show that the specific surface area (58.5 m²/g) of PCN increases significantly, which is about 4 times of that of g-C₃N₄. The maximum adsorption capacity of PCN for U(Ⅵ) is 92 mg/g at the proper conditions of pH=5, the adsorption time of 2 h, the initial U(Ⅵ) concentration of 10 mg/L, the dosage of adsorbent of 0.2 g/L and the temperature of 303 K. The adsorption is well fitted to the second order kinetic equation and the Langmuir isothermal adsorption model, FT-IR and XPS confirm that the nitrogenous group on PCN is involved in the adsorption of U(Ⅵ).
- graphite phase carbon nitride,
- porous graphite phase carbon nitride,
- U(Ⅵ),
- adsorption mechanism

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