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Adsorption of pentachlorophenol to a humin-like substance-bentonite complex prepared by polycondensation reactions of humic precursors

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Title: Adsorption of pentachlorophenol to a humin-like substance-bentonite complex prepared by polycondensation reactions of humic precursors
Authors: Fukushima, Masami Browse this author →KAKEN DB
Okabe, Ryo Browse this author
Nishimoto, Ryo Browse this author
Fukuchi, Shigeki Browse this author
Sato, Tsutomu Browse this author
Terashima, Motoki Browse this author
Keywords: Pentachlorophenol
Humin-bentonite complex
Humic precursors
Polycondensation reaction
Issue Date: Jan-2014
Publisher: Elsevier science bv
Journal Title: Applied clay science
Volume: 87
Start Page: 136
End Page: 141
Publisher DOI: 10.1016/j.clay.2013.10.022
Abstract: Humic substances have natural surfactant characteristics and have a relatively high affinity for pentachlorophenol (PCP). However, humic substances cannot be loaded into bentonite (Bent) via intercalation because of their larger size. In the present study, a humin-like substance (HuLS) was prepared by polycondensation reactions of humic precursors, such as glycine and catechol, and the product was loaded into Bent. XRD patterns showed that the basal spacing, calculated from the montmorillonite peak, for the HuLS-Bent complex was larger than that for Bent itself, indicating that the intercalation of HuLS was successful. The adsorption capabilities of PCP were evaluated from adsorption isotherms at pH 4.0, 5.5 and 6.5. At all pH values, the linear adsorption coefficients of PCP, K-d (L kg(-1)), for the HuLS-Bent complex (37 at pH 6.5, 247 at pH 5.5 and 804 at pH 4.0) were significantly larger than those for Bent itself (not determined at pH 6.5,40 at pH 5.5 and 94 at pH 4.0). These results show that the adsorption capabilities of PCP can be enhanced by loading HuLS onto Bent. In addition, the K-d values for Bent and the HuLS-Bent complex were found to be pH-dependent, in that the K-d value decreased with increasing pH. Because of the pK(a) for PCP (4.75), more than 90% of the PCP was present as the anionic form at pH 5.5 and 6.5. In addition, the values for the Zeta potentials for Bent and the HuLS-Bent complex remained negative at pH 2-12 and decreased with increasing pH. It thus appears that electrostatic repulsion between the anionic form of PCP and the adsorbents can affect the adsorption capabilities. (C) 2013 Elsevier B.V. All rights reserved.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 福嶋 正巳

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