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Aggregation and charge reversal of humic substances in the presence of hydrophobic monovalent counter-ions: Effect of hydrophobicity of humic substances
http://hdl.handle.net/2241/00151510
1fd445d3-d62d-4f23-a346-9ad3cfa955f7
名前 / ファイル | ライセンス | Actions | |
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item type | Journal Article(1) | |||||
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公開日 | 2018-04-26 | |||||
タイトル | ||||||
タイトル | Aggregation and charge reversal of humic substances in the presence of hydrophobic monovalent counter-ions: Effect of hydrophobicity of humic substances | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
タイプ | journal article | |||||
著者 |
Hakim, Azizul
× Hakim, Azizul× Kobayashi, Motoyoshi |
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著者別名 |
小林, 幹佳
× 小林, 幹佳 |
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抄録 | ||||||
内容記述 | To investigate the effect of hydrophobicity of humic substances (HSs) on their charging and aggregation, we studied the electrophoretic mobility and aggregation-dispersion of HSs in the presence of hydrophobic monovalent cations, namely, tetraphenylphosponium TPP+. The used HSs were standard Suwannee river fulvic acid (SRFA), Suwannee river humic acid (SRHA), and Leonardite humic acid (LHA) with different contents of aromatic carbons. All of the HSs in the presence of TPP+ showed charger reversal. The charge reversal pH or iso-electric point (IEP) of LHA was higher than that of SRFA and SRHA in every concentrations of TPPCl, demonstrating the strong hydrophobic interaction between HSs, especially LHA, and TPP+. We also found that the formation of large visible aggregates of all the HSs at lower pH in the presence of TPP+. Large HS aggregates were markedly formed for LHA, manifesting the existence of stronger hydrophobic attraction among LHAs with TPP+. The appearance of aggregates of all the HSs with TPP+ was confirmed by microscopic observation and the size determination by dynamic light scattering. The HS aggregates showed fractal structure. The values of fractal dimension Df of HS aggregates were 2–2.2 in quiescent conditions, indicating that the HS aggregates with TPP+ were formed via cluster-cluster aggregation with restructuring. The Df increased to 2.8–2.9 in stirring conditions, implying that the compact aggregates were formed through the continuous aggregate breakage and the regrowth between smaller aggregates and larger aggregates. | |||||
書誌情報 |
Colloids and surfaces. A, Physicochemical and engineering aspects 巻 540, p. 1-10, 発行日 2018-03 |
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ISSN | ||||||
収録物識別子 | 0927-7757 | |||||
書誌レコードID | ||||||
収録物識別子 | AA10892561 | |||||
DOI | ||||||
関連識別子 | ||||||
関連識別子 | 10.1016/j.colsurfa.2017.12.065 | |||||
権利 | ||||||
権利情報 | © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | |||||
著者版フラグ | ||||||
値 | author | |||||
出版者 | ||||||
出版者 | Elsevier |