Uptake of heavy metal cations by chitosan-modified montmorillonite: Kinetics and equilibrium studies

Tomohito Kameda; Reina Honda; Shogo Kumagai; Yuko Saito; Toshiaki Yoshioka

doi:10.1016/j.matchemphys.2019.121784

Uptake of heavy metal cations by chitosan-modified montmorillonite: Kinetics and equilibrium studies

Tomohito Kameda, Reina Honda, Shogo Kumagai, Yuko Saito, Toshiaki Yoshioka

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

The adsorption of Cu²⁺ and Ni²⁺ by chitosan-modified montmorillonite (CTS-modified MMT) was investigated. Kinetic analyses suggested that the adsorption of Cu²⁺ and Ni²⁺ by MMT, CTS, and CTS-modified MMT can be modeled using a pseudo-second-order kinetic equation. The adsorption isotherms clearly indicate that the adsorption follows the Langmuir equation. The adsorption of metal cations by CTS-modified MMT is thought to be attributable to the cation adsorption capacity of MMT and the ability of CTS to form complexes with metal ions. Desorption and re-adsorption experiments were also conducted to determine the possibility of reusing the synthesized adsorbent. Using a 100-mmol/L HNO₃ solution, a desorption rate of approximately 90% was achieved for the CTS-modified MMT. The CTS-modified MMT obtained after desorption could achieve the same level of adsorption as fresh the CTS-modified MMT, indicating that this adsorbent can be reused.

Original language	English
Article number	121784
Journal	Materials Chemistry and Physics
Volume	236
DOIs	https://doi.org/10.1016/j.matchemphys.2019.121784
Publication status	Published - 2019 Oct 1

Keywords

Chitosan
Heavy metal ions
Modification
Montmorillonite
Uptake

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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10.1016/j.matchemphys.2019.121784

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title = "Uptake of heavy metal cations by chitosan-modified montmorillonite: Kinetics and equilibrium studies",

abstract = "The adsorption of Cu2+ and Ni2+ by chitosan-modified montmorillonite (CTS-modified MMT) was investigated. Kinetic analyses suggested that the adsorption of Cu2+ and Ni2+ by MMT, CTS, and CTS-modified MMT can be modeled using a pseudo-second-order kinetic equation. The adsorption isotherms clearly indicate that the adsorption follows the Langmuir equation. The adsorption of metal cations by CTS-modified MMT is thought to be attributable to the cation adsorption capacity of MMT and the ability of CTS to form complexes with metal ions. Desorption and re-adsorption experiments were also conducted to determine the possibility of reusing the synthesized adsorbent. Using a 100-mmol/L HNO3 solution, a desorption rate of approximately 90% was achieved for the CTS-modified MMT. The CTS-modified MMT obtained after desorption could achieve the same level of adsorption as fresh the CTS-modified MMT, indicating that this adsorbent can be reused.",

keywords = "Chitosan, Heavy metal ions, Modification, Montmorillonite, Uptake",

author = "Tomohito Kameda and Reina Honda and Shogo Kumagai and Yuko Saito and Toshiaki Yoshioka",

note = "Funding Information: This work was supported by JSPS KAKENHI [grant number 15KK0021 ]. Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

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doi = "10.1016/j.matchemphys.2019.121784",

language = "English",

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T1 - Uptake of heavy metal cations by chitosan-modified montmorillonite

T2 - Kinetics and equilibrium studies

AU - Kameda, Tomohito

AU - Honda, Reina

AU - Kumagai, Shogo

AU - Saito, Yuko

AU - Yoshioka, Toshiaki

PY - 2019/10/1

Y1 - 2019/10/1

N2 - The adsorption of Cu2+ and Ni2+ by chitosan-modified montmorillonite (CTS-modified MMT) was investigated. Kinetic analyses suggested that the adsorption of Cu2+ and Ni2+ by MMT, CTS, and CTS-modified MMT can be modeled using a pseudo-second-order kinetic equation. The adsorption isotherms clearly indicate that the adsorption follows the Langmuir equation. The adsorption of metal cations by CTS-modified MMT is thought to be attributable to the cation adsorption capacity of MMT and the ability of CTS to form complexes with metal ions. Desorption and re-adsorption experiments were also conducted to determine the possibility of reusing the synthesized adsorbent. Using a 100-mmol/L HNO3 solution, a desorption rate of approximately 90% was achieved for the CTS-modified MMT. The CTS-modified MMT obtained after desorption could achieve the same level of adsorption as fresh the CTS-modified MMT, indicating that this adsorbent can be reused.

AB - The adsorption of Cu2+ and Ni2+ by chitosan-modified montmorillonite (CTS-modified MMT) was investigated. Kinetic analyses suggested that the adsorption of Cu2+ and Ni2+ by MMT, CTS, and CTS-modified MMT can be modeled using a pseudo-second-order kinetic equation. The adsorption isotherms clearly indicate that the adsorption follows the Langmuir equation. The adsorption of metal cations by CTS-modified MMT is thought to be attributable to the cation adsorption capacity of MMT and the ability of CTS to form complexes with metal ions. Desorption and re-adsorption experiments were also conducted to determine the possibility of reusing the synthesized adsorbent. Using a 100-mmol/L HNO3 solution, a desorption rate of approximately 90% was achieved for the CTS-modified MMT. The CTS-modified MMT obtained after desorption could achieve the same level of adsorption as fresh the CTS-modified MMT, indicating that this adsorbent can be reused.

KW - Chitosan

KW - Heavy metal ions

KW - Modification

KW - Montmorillonite

KW - Uptake

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ER -

Uptake of heavy metal cations by chitosan-modified montmorillonite: Kinetics and equilibrium studies

Abstract

Keywords

ASJC Scopus subject areas

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