Acta Chim. Sinica ›› 2018, Vol. 76 ›› Issue (9): 701-708.DOI: 10.6023/A18060245 Previous Articles     Next Articles

Article

聚苯胺改性Mxene复合材料对U(VI)的高效富集及机理研究

顾鹏程, 宋爽, 张塞, 韦犇犇, 文涛, 王祥科   

  1. 华北电力大学环境科学与工程学院 北京 102206
  • 收稿日期:2018-06-24 出版日期:2018-09-15 发布日期:2018-07-27
  • 通讯作者: 王祥科 E-mail:xkwang@ncepu.edu.cn
  • 基金资助:

    项目受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)和华北电力大学双一流研究生人才培养计划(No.035/XM1805316)资助.

Enrichment of U(VI) on Polyaniline Modified Mxene Composites Studied by Batch Experiment and Mechanism Investigation

Gu Pengcheng, Song Shuang, Zhang Sai, Wei Benben, Wen Tao, Wang Xiangke   

  1. School of Environment and Chemical Engineering, North China Electric Power University, Beijing 102206, China
  • Received:2018-06-24 Online:2018-09-15 Published:2018-07-27
  • Contact: 10.6023/A18060245 E-mail:xkwang@ncepu.edu.cn
  • Supported by:

    Project supported by the financial support from the National Key Research and Development Program of China (No. 2017YFA0207002), National Natural Science Foundation of China (Nos. 21577032 and 21707033) and the NCEPU "Double First-Class" Graduate Talent Cultivation Program (No. 035/XM1805316).

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/Ti3C2Tx was 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 pointed out that PANI/Ti3C2Tx materials were promising adsorbent for the efficient removal of U(VI) in the environmental pollution remediation.

Key words: PANI/Ti3C2Tx, U(VI), adsorption, interaction mechanism