A facile modification method of activated carbon by spark discharge of atmospheric pressure plasma jets to improve its adsorption performance of methylene blue

Autor: Shen Chengzhu, Guolin Song, Guoyi Tang
Rok vydání: 2018
Předmět:
Zdroj: Surface and Coatings Technology. 354:126-133
ISSN: 0257-8972
DOI: 10.1016/j.surfcoat.2018.09.010
Popis: In this study, spark discharge of atmospheric pressure plasma jets (SDAPPJs) was employed to modify activated carbon (AC) prepared from coconut shells. The physical and chemical properties of AC were tailored by SDAPPJs treatment to enhance the adsorption performance. The pristine AC and its modified samples were characterized by N2 isotherms, X-ray photoelectron spectroscopy (XPS), fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) in terms of micro structure, chemical composition, morphology, and etc. The methylene blue (MB) removal capability of these AC samples from aqueous solution was investigated by UV–vis spectrophotometer to determine the influences of the modification on the adsorption performance. The results show that SDAPPJs modification not only improves the specific surface area and total pore volume of AC while maintaining good structural stability, but also increases its surface oxygen-containing functional groups under the influence of active species, which eventually enhances the electrostatic interaction between contaminants and defective surface layers of AC. In brief, SDAPPJs treatment has a positive impact on the adsorption capacity of AC, and its removal efficiency of MB increases by 15.64% when the treatment distance, speed and time are 20 mm, 10 mm/s and 3 min, respectively.
Databáze: OpenAIRE
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