Nanoarchitectonics of heteroatom-doped hierarchical porous carbon derived from carboxymethyl cellulose carbon aerogel and metal-organic framework for capacitive deionization

Zhen Wang; Ming Gao; Jie Peng; Luwei Miao; Wenqing Chen; Tianqi Ao

doi:10.1016/j.ijbiomac.2023.124596

Nanoarchitectonics of heteroatom-doped hierarchical porous carbon derived from carboxymethyl cellulose carbon aerogel and metal-organic framework for capacitive deionization

Int J Biol Macromol. 2023 Jun 30:241:124596. doi: 10.1016/j.ijbiomac.2023.124596. Epub 2023 Apr 26.

Authors

Zhen Wang¹, Ming Gao², Jie Peng², Luwei Miao², Wenqing Chen³, Tianqi Ao⁴

Affiliations

¹ Institute for Disaster Management and Reconstruction, Sichuan University-The Hong Kong Polytechnic University, Chengdu 610065, China.
² College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
³ Institute for Disaster Management and Reconstruction, Sichuan University-The Hong Kong Polytechnic University, Chengdu 610065, China; College of Architecture and Environment, Sichuan University, Chengdu 610065, China. Electronic address: scujournal@163.com.
⁴ State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China; College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China.

PMID: 37116842
DOI: 10.1016/j.ijbiomac.2023.124596

Abstract

Capacitive deionization (CDI) using porous materials offers a sustainable solution for providing affordable freshwater, but the low salt adsorption rate of benchmark carbon materials significantly limit the practical implementation. Herein, we utilized carboxymethyl cellulose sodium (CMC) as the carbon skeleton to produce a composite carbon aerogel loaded with ZIF-8 (ZIF-8/CMC-CA). The presence of ZIF-8 nanoparticles improved the pore structure of the material and provides a certain pseudo capacitance by introducing N. Compared with ZIF-8 derived carbons (ZIF-8-C), the CMC provided a good three-dimensional structure for the dispersion of ZIF-8 nanoparticles, reduced the agglomeration of particles. Furthermore, numerous carboxyl and hydroxyl groups on CMC enhanced the hydrophilicity of materials. Due to the interconnected structure, ZIF-8/CMC-CA exhibited excellent conductivity, a high specific surface area, and offered suitable channels for the rapid entry and exit of ions. In a three-electrode system, the total specific capacitance of the ZIF-8/CMC-CA electrode was 357.14 F g^-1. The adsorption rate of ZIF-8/CMC-CA was 2.02 mg g^-1 min^-1 in a 500 mg L^-1 NaCl solution. This study may provide new insight for modifying and fabricating electrode materials for practical CDI applications.

Keywords: Biomass; Capacitive deionization; Carbon aerogel; Hierarchical porous carbon; Metal-organic framework.

MeSH terms

Carbon* / chemistry
Carboxymethylcellulose Sodium
Metal-Organic Frameworks*
Porosity
Sodium Chloride / chemistry

Substances

Carbon
Carboxymethylcellulose Sodium
Metal-Organic Frameworks
Sodium Chloride