Effect of Microwave Non thermal Plasma Irradiation on the Adsorptive Properties of Active Carbon Preliminarily Impregnated with Poly(vinyl alcohol)
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概要
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Microwave non thermal plasma irradiation was conducted on active carbon (AC) preliminarily impregnated with poly(vinyl alcohol) (PVA) in order to modify the adsorption properties of active carbon, particularly to increase hydrophobicity. The plasma was produced by applying microwave power on the PVA-impregnated active carbon (PVA/AC) placed in a low vacuum chamber (${<}10$ Torr). The surface of the plasma-treated PVA/AC was imaged using scanning electron microscopy and atomic force microscopy (SEM and AFM, respectively), and analyzed using X-ray photoelectron spectroscopy (XPS). Hydrophobicity of the plasma-treated PVA/AC was compared to that of untreated PVA/AC and AC by a sinking test in water/methanol mixed solutions. The hydrophobicity drastically increased for PVA/AC treatment with 1-min plasma irradiation. The AFM results indicated that the surface roughness of the PVA/AC was dependent upon the hydrophobicity, rather than reduction of free energy due to reduction of polarized functional groups. NaOH and HCl adsorption onto the plasma-treated PVA/AC was also measured. Adsorption capacity of plasma-treated PVA/AC increased for NaOH, whereas it decreased for HCl. The plasma treatment not only increased the hydrophobicity of PVA/AC, but also changed its acid-base adsorption properties. We have developed a new material based on active carbon, which is light, hydrophobic and electrically conductive by using a combination of PVA sintering and plasma irradiation.
- 2010-08-25
著者
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Nakajima Yuki
Department Of Applied Life Sciences Niigata University Of Pharmacy And Applied Life Sciences
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Sugiyama Kazuo
Department of Chemical and Biological Engineering, Hachinohe National College of Technology, 16-1 Uwanotai, Tamonoki, Hachinohe, Aomori 039-1192, Japan
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Ueshima Masato
Department of Chemical and Biological Engineering, Hachinohe National College of Technology, 16-1 Uwanotai, Tamonoki, Hachinohe, Aomori 039-1192, Japan
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Toda Eriko
Department of Applied Chemistry, Faculty of Engineering, Saitama University, 255 Shimo-okubo, Sakura, Saitama 338-8570, Japan
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Nakajima Yuki
Department of Applied Chemistry, Faculty of Engineering, Saitama University, 255 Shimo-okubo, Sakura, Saitama 338-8570, Japan
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Sugiyama Kazuo
Department of Applied Chemistry, Faculty of Engineering, Kinki University
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