摘要
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-C_(3)N_(4))进行改性,制备了多孔石墨相氮化碳(PCN)材料,研究了g-C_(3)N_(4)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 m^(2)/g),约为g-C_(3)N_(4)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-C_(3)N_(4))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-C_(3)N_(4)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(Ⅵ).The results show that the specific surface area(58.5 m^(2)/g)of PCN increases significantly,which is about 4 times of that of g-C 3N 4.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).
作者
葛玉杰
吴姣
王国华
周帅
刘金香
GE Yujie;WU Jiao;WANG Guohua;ZHOU Shuai;LIU Jinxiang(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)
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2021年第4期603-611,共9页
Atomic Energy Science and Technology
关键词
石墨相氮化碳
多孔石墨相氮化碳
U(Ⅵ)
吸附机理
graphite phase carbon nitride
porous graphite phase carbon nitride
U(Ⅵ)
adsorption mechanism
