SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2022, Vol. 45 ›› Issue (5): 15-21.DOI: 10.1016/j.cjche.2021.05.014

• • 上一篇    下一篇

Atomic layer deposition of TiO2 on carbon-nanotubes membrane for capacitive deionization removal of chromium from water

Jianhua Feng1,2, Sen Xiong2, Li Ren2, Yong Wang2   

  1. 1 College of Material and Chemical Engineering, Chuzhou University, Chuzhou 239000, China;
    2 State Key Laboratory of Materials-Oriented Chemical Engineering, and College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
  • 收稿日期:2021-02-03 修回日期:2021-05-27 出版日期:2022-05-28 发布日期:2022-06-22
  • 通讯作者: Yong Wang,E-mail:yongwang@njtech.edu.cn
  • 基金资助:
    Financial supports from the Jiangsu Natural Science Foundation (BK20190677), National Natural Science Foundation of China (21908096) and Scientific Research Foundation of Chuzhou University (2020qd06) are gratefully acknowledged. We also thank the support from the Program of Excellent Innovation Teams of Jiangsu Higher Education Institutions, and the Project of Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

Atomic layer deposition of TiO2 on carbon-nanotubes membrane for capacitive deionization removal of chromium from water

Jianhua Feng1,2, Sen Xiong2, Li Ren2, Yong Wang2   

  1. 1 College of Material and Chemical Engineering, Chuzhou University, Chuzhou 239000, China;
    2 State Key Laboratory of Materials-Oriented Chemical Engineering, and College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
  • Received:2021-02-03 Revised:2021-05-27 Online:2022-05-28 Published:2022-06-22
  • Contact: Yong Wang,E-mail:yongwang@njtech.edu.cn
  • Supported by:
    Financial supports from the Jiangsu Natural Science Foundation (BK20190677), National Natural Science Foundation of China (21908096) and Scientific Research Foundation of Chuzhou University (2020qd06) are gratefully acknowledged. We also thank the support from the Program of Excellent Innovation Teams of Jiangsu Higher Education Institutions, and the Project of Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

摘要: Chromium (Cr) is a common heavy metal that has severe impacts on the ecosystem and human health. Capacitive deionization (CDI) is an environment-friendly and energy-efficient electrochemical purification technology to remove Cr from polluted water. The performance of CDI systems relies primarily on the properties of electrodes. Carbon-nanotubes (CNTs) membranes are promising candidates in creating advanced CDI electrodes and processes. However, the low electrosorption capacity and high hydrophobicity of CNTs greatly impede their applications in water systems. In this study, we employ atomic layer deposition (ALD) to deposit TiO2 nanoparticulates on CNTs membranes for preparing electrodes with hydrophilicity. The TiO2-deposited CNTs membranes display preferable electrosorption performance and reusability in CDI processes after only 20 ALD cycles deposition. The total Cr and Cr(VI) removal efficiencies are significantly improved to 92.1% and 93.3%, respectively. This work demonstrates that ALD is a highly controllable and simple method to produce advanced CDI electrodes, and broadens the application of metal oxide/carbon composites in the electrochemical processes.

关键词: Carbon-nanotube membranes, Atomic layer deposition, Capacitive deionization, Chromium removal

Abstract: Chromium (Cr) is a common heavy metal that has severe impacts on the ecosystem and human health. Capacitive deionization (CDI) is an environment-friendly and energy-efficient electrochemical purification technology to remove Cr from polluted water. The performance of CDI systems relies primarily on the properties of electrodes. Carbon-nanotubes (CNTs) membranes are promising candidates in creating advanced CDI electrodes and processes. However, the low electrosorption capacity and high hydrophobicity of CNTs greatly impede their applications in water systems. In this study, we employ atomic layer deposition (ALD) to deposit TiO2 nanoparticulates on CNTs membranes for preparing electrodes with hydrophilicity. The TiO2-deposited CNTs membranes display preferable electrosorption performance and reusability in CDI processes after only 20 ALD cycles deposition. The total Cr and Cr(VI) removal efficiencies are significantly improved to 92.1% and 93.3%, respectively. This work demonstrates that ALD is a highly controllable and simple method to produce advanced CDI electrodes, and broadens the application of metal oxide/carbon composites in the electrochemical processes.

Key words: Carbon-nanotube membranes, Atomic layer deposition, Capacitive deionization, Chromium removal