抄録
Organo-montmorillonites (OMt) adsorb perchlorate (ClO4 −) through anion exchange mechanism. Each gemini surfactant (GCn) provides two anion exchangeable sites due to its unique molecular structure. Due to the presence of more anion exchangeable sites, the preparation of OMt with GCn enables the possibility for higher amount of ClO4 − uptake than their single-chain counterparts. In this work, gemini surfactant modified montmorillonites (GCn-Mt) were synthesized using three different alkyl chain length containing gemini surfactants (CnH2n+1(Me)2-C6H12-CnH2n+1(Me)2·2Cl), where n varied to 12, 14 and 16 and were examined in detail for the adsorption of ClO4 − from aqueous solution. The structure of the GCn-Mt before and after adsorption of ClO4 − was characterized by an array of techniques such as powder XRD, FT-IR, XPS, TGA and CHN analysis. The adsorption of ClO4 − onto the GCn-Mt was best described by the Langmuir adsorption isotherm and pseudo-second-order kinetic model. The GC16-Mt showed the highest removal capacity of 1.08 mmol/g and at a rapid rate, achieving 95% within 1 min, with an equilibrium time of 15 mins. The GC16-Mt retained its high removal capacity and selectivity in presence of a variety of coexisting anions such as HCO3 −, NO3 −, CO3 2−, SO4 2−, SiO3 2−, and H2PO4 −, and at a wide pH range (2−12). Combining the high removal capacity and selectivity with fast kinetics, the GCn-Mt has great potential for ClO4 − removal from aqueous solutions.
| 元の言語 | 英語 |
|---|---|
| ページ（範囲） | 46-55 |
| ページ数 | 10 |
| ジャーナル | Applied Clay Science |
| 巻 | 163 |
| DOI | |
| 出版物ステータス | 出版済み - 10 1 2018 |
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All Science Journal Classification (ASJC) codes
- Geology
- Geochemistry and Petrology
これを引用
Enhanced adsorption of perchlorate by gemini surfactant-modified montmorillonite : Synthesis, characterization and their adsorption mechanism. / Srinivasarao, Kancharla; Prabhu, Subbaiah Muthu; Luo, Wuhui; Sasaki, Keiko.
：: Applied Clay Science, 巻 163, 01.10.2018, p. 46-55.研究成果: ジャーナルへの寄稿 › 記事
}
TY - JOUR
T1 - Enhanced adsorption of perchlorate by gemini surfactant-modified montmorillonite
T2 - Synthesis, characterization and their adsorption mechanism
AU - Srinivasarao, Kancharla
AU - Prabhu, Subbaiah Muthu
AU - Luo, Wuhui
AU - Sasaki, Keiko
PY - 2018/10/1
Y1 - 2018/10/1
N2 - Organo-montmorillonites (OMt) adsorb perchlorate (ClO4 −) through anion exchange mechanism. Each gemini surfactant (GCn) provides two anion exchangeable sites due to its unique molecular structure. Due to the presence of more anion exchangeable sites, the preparation of OMt with GCn enables the possibility for higher amount of ClO4 − uptake than their single-chain counterparts. In this work, gemini surfactant modified montmorillonites (GCn-Mt) were synthesized using three different alkyl chain length containing gemini surfactants (CnH2n+1(Me)2-C6H12-CnH2n+1(Me)2·2Cl), where n varied to 12, 14 and 16 and were examined in detail for the adsorption of ClO4 − from aqueous solution. The structure of the GCn-Mt before and after adsorption of ClO4 − was characterized by an array of techniques such as powder XRD, FT-IR, XPS, TGA and CHN analysis. The adsorption of ClO4 − onto the GCn-Mt was best described by the Langmuir adsorption isotherm and pseudo-second-order kinetic model. The GC16-Mt showed the highest removal capacity of 1.08 mmol/g and at a rapid rate, achieving 95% within 1 min, with an equilibrium time of 15 mins. The GC16-Mt retained its high removal capacity and selectivity in presence of a variety of coexisting anions such as HCO3 −, NO3 −, CO3 2−, SO4 2−, SiO3 2−, and H2PO4 −, and at a wide pH range (2−12). Combining the high removal capacity and selectivity with fast kinetics, the GCn-Mt has great potential for ClO4 − removal from aqueous solutions.
AB - Organo-montmorillonites (OMt) adsorb perchlorate (ClO4 −) through anion exchange mechanism. Each gemini surfactant (GCn) provides two anion exchangeable sites due to its unique molecular structure. Due to the presence of more anion exchangeable sites, the preparation of OMt with GCn enables the possibility for higher amount of ClO4 − uptake than their single-chain counterparts. In this work, gemini surfactant modified montmorillonites (GCn-Mt) were synthesized using three different alkyl chain length containing gemini surfactants (CnH2n+1(Me)2-C6H12-CnH2n+1(Me)2·2Cl), where n varied to 12, 14 and 16 and were examined in detail for the adsorption of ClO4 − from aqueous solution. The structure of the GCn-Mt before and after adsorption of ClO4 − was characterized by an array of techniques such as powder XRD, FT-IR, XPS, TGA and CHN analysis. The adsorption of ClO4 − onto the GCn-Mt was best described by the Langmuir adsorption isotherm and pseudo-second-order kinetic model. The GC16-Mt showed the highest removal capacity of 1.08 mmol/g and at a rapid rate, achieving 95% within 1 min, with an equilibrium time of 15 mins. The GC16-Mt retained its high removal capacity and selectivity in presence of a variety of coexisting anions such as HCO3 −, NO3 −, CO3 2−, SO4 2−, SiO3 2−, and H2PO4 −, and at a wide pH range (2−12). Combining the high removal capacity and selectivity with fast kinetics, the GCn-Mt has great potential for ClO4 − removal from aqueous solutions.
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U2 - 10.1016/j.clay.2018.07.010
DO - 10.1016/j.clay.2018.07.010
M3 - Article
VL - 163
SP - 46
EP - 55
JO - Applied Clay Science
JF - Applied Clay Science
SN - 0169-1317
ER -