title: Effect of coal ash on hydrazine degradation under stirring and ultrasonic irradiation conditions.
abstract: The degradation of hydrazine (N(2)H(4)) with concentrations of 0.1-5.0 mmol/L was investigated as a function of amount of coal ash (0.0-5.0 wt%) under the stirring (300 rpm) and ultrasonic irradiation (200 kHz, 200 W) conditions. It was found that the rate of decrease in the hydrazine concentration depended upon an amount of coal ash under the stirring and ultrasonic irradiation condition. It was considered under the stirring condition that hydrazine was adsorbed and degraded partly on coal ash. Furthermore, the sonochemically formed OH radicals were more effective in the hydrazine degradation than stirring condition in the presence of an intermediate amount of coal ash (0.6-2.4 wt%), whereas the effect of OH radicals disappeared in the presence of coal ash more than 2.4 wt%.
authors.affiliation: Technology Development Center, Electric Power Development Co., Ltd., 9-88, Chigasaki 1-Chome, Chigasaki, Kanagawa 253-0041, Japan. Electronic address: hiroyuki_nakui@jpower.co.jp.
authors.forename: H
authors.initials: H
authors.lastname: Nakui
authors.affiliation: Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Sakai, Osaka 599-8531, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Okitsu
authors.affiliation: Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Sakai, Osaka 599-8531, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Maeda
authors.affiliation: Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Sakai, Osaka 599-8531, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Nishimura
mesh_terms: D002244:Carbon / Q000737:chemistry*; D060729:Coal Ash; D006834:Hydrazines / Q000737:chemistry* / Q000528:radiation effects*; D017665:Hydroxyl Radical; D052638:Particulate Matter / Q000737:chemistry*; D012996:Solutions; D014465:Ultrasonics
chemical_list: D060729:Coal Ash; D006834:Hydrazines; D052638:Particulate Matter; D012996:Solutions; D017665:Hydroxyl Radical; D002244:Carbon