期刊
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
卷 120, 期 -, 页码 389-398出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jaap.2016.06.009
关键词
Sugar cane bagasse fly ash; Capacitive deionization; Surface oxygen groups; Pyrolysis
资金
- Sao Paulo Research Foundation (FAPESP) [2015/16107-4]
- Coordination for the Improvement of Higher Education Personnel (CAPES) [88881.030322/2013-01]
- National Council of Technological and Scientific Development (CNPq)
- CNPq
- CAPES
An abundant low-cost biowaste material such as sugar cane bagasse fly ash (SCBFA) was evaluated in this work as a capacitive deionization (CDI) electrode for brackish water desalination applications. A thermal treatment of SCBFA at different temperatures (200-800 degrees C) was explored as a way to improve structural and electrochemical properties. Pyrolysis at 200 degrees C resulted in an increase of the surface oxygen groups (SOG) that drastically improved electrode wettability. As a consequence, not only specific capacitance values increased (from 33 to 55 Fg(-1)) but also maximum salt adsorption capacity (mSAC, from 2.9 to 5.3 mg g(-1)). Higher temperatures led to higher specific surface areas materials but also to the decomposition of SOG. This resulted in lower mSAC values but still higher than pre-heated SCBFA. Under brackish water concentrations (40 mM NaCl) the observed mSAC values reached 6.2 mg g(-1), showing the potential of the T200 material as CDI electrode. (C) 2016 Elsevier B.V. All rights reserved.
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