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Title: Impact of corona treated activated carbon in anionic and cationic dye adsorption
Other Titles: Impacto de carvões ativados tratados com descarga corona na adsorção de corantes catiônicos e aniônicos
Keywords: Corona treatment
Surface modification
Textural properties
Microscopia eletrônica de varredura
Tratamento corona
Modificação de superfície
Propriedades texturais
Scanning electron microscopy
Issue Date: Apr-2017
Publisher: Universidade Federal de Lavras
Citation: PEGO, M. F. F. et al. Impact of corona treated activated carbon in anionic and cationic dye adsorption. Cerne, Lavras, v. 23, n. 2, p. 219-228, Apr./Jun. 2017.
Abstract: Dye degradation is a significant topic in environmental science, since dyes can bring several problems to the environment. Activated carbon (AC) is an important material used as adsorbent of these hazardous substances, but need to be improved especially into specific substances. This paper aimed to evaluate the impact of activated carbon surface modified by corona treatment (electric discharge) on adsorption of different dyes. Activated carbons were treated by corona treatment to cause surface modification, modifying exposure time to treatment (2, 5, 8 and 10 minutes). Evaluation of adsorption was performed by adsorption isotherms and kinetic adsorption. Dyes differed in their charge (anionic or cationic) and molecular weight. Dyes used were Methylene Blue (cationic) and Congo Red (anionic). Surface area and Scanning Electron Microscopy (SEM) were also conducted. Surface chemistry was impacted by corona treatment and interfered in dye adsorption. There was decrease of dye adsorption for both dyes according to time exposure. However, the decrease of Methylene Blue (25%) was higher than Congo Red (14%), suggesting that either charge or molecule weight interfere in the adsorption isotherms. In kinetic adsorption, there was no difference between treatments, although there was a difference in adsorption equilibrium. SEM showed that surface was impacted (pore destruction) by corona treatment. Furthermore, estimated surface area was strongly impacted by the treatment, reducing with the increase of time exposure. Thus, textural properties might have contributed to reduce adsorption capacity of both dyes and play a higher role than chemical properties.
Appears in Collections:DQI - Artigos publicados em periódicos

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