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Sustainable lignin-derived hierarchically porous carbon for capacitive deionization applications

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Abstract

In this work, hierarchical porous carbons were fabricated via an environmentally friendly and sustainable approach involving self-assembly of a cross-linked lignin polymer with a less toxic cross-linker and a triblock copolymer template. The porous carbons obtained by using different cross-linking agents were evaluated by N2 adsorption/desorption analyses, scanning electron microscopy, and transmission electron microscopy, revealing a tunable ratio of mesopore to micropore volume. The utilization of lignin-derived porous carbons for capacitive deionization (CDI) was investigated. The results showed that a porous carbon electrode with a higher mesoporosity (a lower specific surface area) exhibited higher salt adsorption capacity and a better rate capability, compared to the high specific surface area of a micro-dominant porous carbon electrode. The contribution of mesopores was to promote the ion transfer into the interior pores, providing a more accessible surface area, thus improving the capacity of ion storage. This work presents an example of CDI utilization and a value-added approach of bio-based lignin materials as promising electrode materials for desalination applications.

Graphical abstract: Sustainable lignin-derived hierarchically porous carbon for capacitive deionization applications

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Supplementary files

Article information


Submitted
13 May 2020
Accepted
23 Jun 2020
First published
24 Jun 2020

New J. Chem., 2020, Advance Article
Article type
Paper

Sustainable lignin-derived hierarchically porous carbon for capacitive deionization applications

S. Chaleawlert-umpon and N. Pimpha, New J. Chem., 2020, Advance Article , DOI: 10.1039/D0NJ02424D

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