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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Understanding the mechanism of carbonization and KOH activation of polyaniline leading to enhanced electrosorption performance

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