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- Title
Corncob waste activated with different pore formers for capacitive deionization (CDI) materials.
- Authors
Lang Lang; Xiao-min Hu; Yan Zhao; Jun Wang; Hong Lin
- Abstract
As a new desalination technology, capacitive deionization (CDI) has made continuous progress in recent years. This paper explores possible resource utilization channels for corncob waste to prepare capacitive deionized plate materials. Using corncob waste as a matrix, porous materials were prepared by high-temperature insulation from oxygen. The specific surface area of the resulting carbon material was 1,267.9 m2 g-1, and a capacitance of 145.5 F g-1 was achieved in a three-electrode system; the desorption capacity was 16.9 mg g, close to the performance of high-performance materials such as graphene. CDI uses low-cost and waste recycling materials. In the present study, different effects of K2FeO4 and KOH as pore formers on the micro-morphology and chemical structure of the material were compared. The corncob-based carbon materials obtained from K2FeO4 and KOH met the basic requirements of the capacitive deionized plate material, whereas K2FeO4 increased the degree of graphitization of corncob carbon materials; the corncob-based bio char produced from the K2FeO4 pores helped to shorten the time of one adsorption cycle, but the cost is slightly higher than that of the KOH hole. Under different requirements, K2FeO4 and KOH are promising as pore-forming agents for corncob CDI electrodes. The cycling performance verified that the carbon materials prepared in the previous process performed well during the desorption process and recycling process, which can meet the needs of repeated use, and corncob waste is a promising resource for capacitive deionization plate materials.
- Subjects
DEIONIZATION of water; CORNCOBS; POROUS materials; SUPERCAPACITOR electrodes; WASTE recycling; WASTE products; CHEMICAL structure; GRAPHITIZATION
- Publication
Desalination & Water Treatment, 2019, Vol 155, p55
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2019.24000