| Texto completo | |
| Autor(es): |
Zornitta, Rafael L.
[1]
;
Barcelos, Kamilla M.
[1]
;
Nogueira, Francisco G. E.
[1]
;
Ruotolo, Luis A. M.
[1]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] Univ Fed Sao Carlos, Dept Chem Engn, Rod Washington Luiz Km 235, BR-13565905 Sao Carlos, SP - Brazil
Número total de Afiliações: 1
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Carbon; v. 156, p. 346-358, JAN 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
Capacitive deionization (CDI) emerged as a new water desalination technology in which ions are removed from brackish water by being attracted and stored in two polarized electrodes. The electrode material plays a very important role affecting other fundamental parameters such as the salt adsorption capacity (SAC), conductivity, desalination kinetics, and energy consumption. Typically, the CDI electrodes are carbon-based materials, fulfilling requirements such as high specific surface area (SSA), chemical stability, and conductivity. Here, we make a comprehensive study of the variables involved in the polyaniline activated carbons (PAC) preparation. A new mechanism is proposed to explain how the carbonization/activation conditions have influence on textural properties (SSA and pore volume) of PAC. We found that carbonization at temperatures <= 600 degrees C are mandatory to provide more KOH-reactive carbon intermediates due to their turbostratic structure. After activation at 850 degrees C, remarkable pore volume (2.30 cm(3)/g) and SSA (similar to 3600m(2)/g) were achieved, which has direct influence on promoting high electrode capacitance (213 F/g), SAC (22.2 mg/g), and charge efficiency (81%). This SAC is among the highest values reported for CDI desalination using carbon electrodes. This work enlightens the mechanism to achieve high performance activated carbons providing a promising electrode material for CDI desalination. (C) 2019 Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 15/26593-3 - Dessalinização por deionização capacitiva: desenvolvimento de eletrodos e otimização do processo |
| Beneficiário: | Rafael Linzmeyer Zornitta |
| Linha de fomento: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 17/19838-5 - Dessalinização e separação de aminoácidos por eletrossorção utilizando eletrodos de grafeno ativado |
| Beneficiário: | Luis Augusto Martins Ruotolo |
| Linha de fomento: | Auxílio à Pesquisa - Regular |