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

doi:10.1016/j.cjche.2021.05.014

Chinese Journal of Chemical Engineering ›› 2022, Vol. 45 ›› Issue (5): 15-21.DOI: 10.1016/j.cjche.2021.05.014

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

Jianhua Feng^1,2, Sen Xiong², Li Ren², Yong Wang²

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:2022-06-22 Published:2022-05-28
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).

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

Jianhua Feng^1,2, Sen Xiong², Li Ren², Yong Wang²

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

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).

Abstract

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

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

Jianhua Feng, Sen Xiong, Li Ren, Yong Wang. Atomic layer deposition of TiO₂ on carbon-nanotubes membrane for capacitive deionization removal of chromium from water[J]. Chinese Journal of Chemical Engineering, 2022, 45(5): 15-21.

Jianhua Feng, Sen Xiong, Li Ren, Yong Wang. Atomic layer deposition of TiO₂ on carbon-nanotubes membrane for capacitive deionization removal of chromium from water[J]. 中国化学工程学报, 2022, 45(5): 15-21.

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

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

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