摘要
采用原位聚合法合成新型PANI/Ti_3C_2T_x有机无机复合纳米材料,并应用于对U(VI)的吸附去除研究.实验结果表明:整个吸附过程受溶液pH和离子强度影响较大,在pH=5.0,室温条件下PANI/Ti_3C_2T_x对U(VI)表现出较高的吸附容量(102.8 mg/g),这一数值远远高于原始Ti_3C_2T_x对U(VI)的饱和吸附量(36.6 mg/g).此外,结合傅立叶变换红外光谱(Fourier transform infrared spectrometry,FTIR)和X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)的分析结果表明PANI/Ti_3C_2T_x中含氧官能团和氨基基团与U(VI)发生络合作用,从而大大提高了其吸附性能.基于此研究,PANI/Ti_3C_2T_x可作为具有前景的复合材料应用于含U(VI)废水的净化中.
Remediation of nuclear wastewater containing U（VI） is very important to human health and environmental ecosystems. Recently, numerous kinds of adsorbents such as clay minerals, carbon-based material and layered double hydroxides etc. have been extensively investigated for effective containing U（VI） wastewater treatment. A representative class of two-dimensional material, ＂Mxene＂ has received multidisciplinary interests due to their widespread application in the fields of batteries, supercapacitors and wastewater treatment. Unfortunately, the adsorption capacity of pristine Mxene is frequently limited due to the low quantity of surface functional groups. It was obviously that synthesizing functionalized Mxene materials with plenty functional groups is of great importance for wastewater remediation. In this manuscript, polyaniline modified Mxene composites（PANI/Ti3C2Tx） were successfully synthesized by a in situ polymerization method and were characterized by a series of methods including SEM, FT-IR, XRD and XPS techniques. The adsorption behavior of U（VI） on PANI/Ti3C2Txwas systematically explored by batch experiment. The experiment results showed that the removal process was obviously affected by the ion strength, indicating the formation of outer-sphere surface complexes. Meanwhile, the thermodynamic results manifested that the adsorption process was spontaneous and endothermic reaction. Based on Langmuir model fit, the maximum adsorption capacity of U（VI） on polyaniline modified Mxene composites was calculated to be 102.8 mg/g at pH=5.0 and 298 K, which was superior than that of U（VI） on pristine Ti3C2Tx（36.6 mg/g）. In addition, spectroscopy characterizations including Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy were applied to study the underlying interaction mechanism, which was mainly attributed to the strong surface complexion between surface functional groups（oxygen-containing groups and amino groups） and U（VI）. This work herein point
作者
顾鹏程
宋爽
张塞
韦犇犇
文涛
王祥科
Gu Pengcheng;Song Shuang;Zhang Sai;Wei Benben;Wen Tao;Wang Xiangke(School of Environment and Chemical Engineering,North China Electric Power University,Beijing 102206,China)
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2018年第9期701-708,共8页
Acta Chimica Sinica
基金
科技部纳米专项重点研发计划(No.2017YFA0207002)
国家自然科学基金(Nos.21577032
21707033)
华北电力大学双一流研究生人才培养计划(No.035/XM1805316)资助~~
