Enhanced adsorption of perchlorate by gemini surfactant-modified montmorillonite: Synthesis, characterization and their adsorption mechanism

Kancharla Srinivasarao, Subbaiah Muthu Prabhu, Wuhui Luo, Keiko Sasaki

研究成果: ジャーナルへの寄稿記事

9 引用 (Scopus)

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
163
DOI
出版物ステータス出版済み - 10 1 2018

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Bentonite
perchlorate
montmorillonite
Surface-Active Agents
surfactant
adsorption
Adsorption
anion
Anions
aqueous solution
kinetics
X-ray spectroscopy
ion exchange
isotherm
X-ray diffraction
Kinetics
removal
Chain length
Adsorption isotherms
Powders

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

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title = "Enhanced adsorption of perchlorate by gemini surfactant-modified montmorillonite: Synthesis, characterization and their adsorption mechanism",
abstract = "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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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

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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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