期刊论文

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

Liu, Jinxiang(cafardworm@163.com)

中文

原子能科学技术

1000-6931

2021

55

4

603-611

10.7538/yzk.2020.youxian.0310

本校为第一机构

以三聚氰胺为原料、碳酸钙为辅助模板,采用热聚合法对石墨相氮化碳(g-C3 N4)进行改性,制备了多孔石墨相氮化碳(PCN)材料,研究了g-C3 N4改性前后对U(Ⅵ)的吸附效果,并利用SEM、BET、FT-IR、XPS等表征手段对PCN吸附U(Ⅵ)的机理进行了分析.结果表明:PCN比表面积显著增大(58.5 m2/g),约为g-C3 N4的4倍;在初始pH=5、吸附时间2 h、U(Ⅵ)初始浓度10 mg/L、PCN用量0.2 g/L、温度303 K条件下,PCN对U(Ⅵ)的最大吸附量为92 mg/g;整个吸附过程符合准二级动力学方程以及Langmuir等温吸附模型;此外,升高温度有利于PCN对U(Ⅵ)的吸附.FT-IR、XPS表征结果表明,PCN中的含氮基团参与了PCN对U(Ⅵ)的吸附去除.

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() by modified g-C3N4 before 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(). The results show that the specific surface area (58.5 m2/g) of PCN increases significantly, which is abo...