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Mechanism of hexavalent chromium adsorption by persimmon tannin gel
http://hdl.handle.net/10458/993
http://hdl.handle.net/10458/9937fba84ff-0fe5-4fca-9f1b-50c9031769a6
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
WatRes-38-2859-2004.pdf (183.9 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2007-12-05 | |||||
| タイトル | ||||||
| タイトル | Mechanism of hexavalent chromium adsorption by persimmon tannin gel | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題Scheme | Other | |||||
| キーワード | chromium adsorption, persimmon tannin, hexavalent chromium ion, ESR | |||||
| 資源タイプ | ||||||
| 資源タイプ | journal article | |||||
| 著者 |
Nakajima, Akira
× Nakajima, Akira× 馬場, 由成 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Mechanism of chromium adsorption by the persimmon tannin （PT） gel was examined. The PT gel can adsorb Cr highly effectively from aqueous solutions containing Cr（VI）, while it adsorbed far smaller amounts of Cr from the solution containing Cr（III）. The maximum Cr adsorption from the Cr（VI） solution occurred at pH 3. The Cr adsorption from the Cr（VI） solution by the PT gel was rapid, was faster than VO2+ and Fe3+ adsorptions, and was obeyed the Langmuir adsorption isotherm （Qe = 5.27 mmol g–1 and K = 16.2 mM）. The gel adsorbed Cr from the Cr（VI） solution （pH 1 and 3） showed no ESR signal of Cr（III）, while the ESR signal of Cr（III） was observed in the residual solution at pH 1. Hexavalent chromium was, therefore, adsorbed on the PT gel through the esterification of chromate with catechol group. In other words, Cr（VI） should combine with catechol as a hard acid, CrO22+ cation. Through the treatment of a Cr（VI） solution with the PT gel, chromium should be recovered as a Cr（IV）-tannin complex at pH 3 or a Cr（III） solution at pH 1 or lower pH region. | |||||
| 言語 | en | |||||
| 内容記述 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | http://www.elsevier.com/wps/find/journaldescription.cws_home/309/description | |||||
| 言語 | en | |||||
| 書誌情報 |
en : Water research 巻 38, 号 12, p. 2859-2864, 発行日 2004-07 |
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| 出版者 | ||||||
| 出版者 | Elsevier | |||||
| 言語 | en | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 00431354 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA00886427 | |||||
| 著者版フラグ | ||||||
| 出版タイプ | AM | |||||
