Functional nanomaterials: Study on aqueous Hg(II) adsorption by magnetic Fe3O4@SiO2-SH nanoparticles

Zhuoxing Wang; Jiang Xu; Yunjun Hu; Heng Zhao; Junliang Zhou; Yu Liu; Zimo Lou; Xinhua Xu

doi:10.1016/j.jtice.2015.10.041

Functional nanomaterials: Study on aqueous Hg(II) adsorption by magnetic Fe₃O₄@SiO₂-SH nanoparticles

Zhuoxing Wang
, Jiang Xu
, Yunjun Hu
, Heng Zhao
, Junliang Zhou
, Yu Liu
, Zimo Lou
, Xinhua Xu

Research output: Journal Publication › Article › peer-review

114 Citations (Scopus)

Abstract

A selective adsorbent for Hg(II) was prepared by coating Fe₃O₄ nanoparticles with SiO₂ which was further functionalized with thiol (-SH) group. The new adsorbent (Fe₃O₄@SiO₂-SH) was shown to adsorb aqueous Hg(II) species in a wide range of pH (1.0-8.0) conditions. The Hg(II) adsorption capacity q_e was more than 90.0 mg g^-1 at pH > 3.0, and was slightly decreased to 84.6 mg g^-1 under strong acidic conditions due to the electrostatic repulsion. The Langmuir isotherm model fitted the adsorption data better than the Freundlich, Temkin, and Dubinin-Radushkevich isotherms models. The maximum adsorption capacity of Fe₃O₄@SiO₂-SH for Hg(II) was 132.0 mg g^-1. The adsorption kinetics were shown to follow the pseudo-second-order kinetic model, and the kinetic constant k₂ was 2.4 × 10^-3 g mg^-1 min^-1. The magnetic retrieve of the newly-developed adsorbent was easily carried out via an external magnetic field, enabling both excellent adsorbent utilization and adsorption efficiency at high Hg(II) concentrations.

Original language	English
Pages (from-to)	394-402
Number of pages	9
Journal	Journal of the Taiwan Institute of Chemical Engineers
Volume	60
DOIs	https://doi.org/10.1016/j.jtice.2015.10.041
Publication status	Published - 1 Mar 2016
Externally published	Yes

Free Keywords

Adsorption
FeO nanoparticles
Hg(II)
SiO-coated
Thiol-functionalized

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering

Access to Document

10.1016/j.jtice.2015.10.041

Cite this

@article{458d56d480234b4ab790983336bb8f05,

title = "Functional nanomaterials: Study on aqueous Hg(II) adsorption by magnetic Fe3O4@SiO2-SH nanoparticles",

abstract = "A selective adsorbent for Hg(II) was prepared by coating Fe3O4 nanoparticles with SiO2 which was further functionalized with thiol (-SH) group. The new adsorbent (Fe3O4@SiO2-SH) was shown to adsorb aqueous Hg(II) species in a wide range of pH (1.0-8.0) conditions. The Hg(II) adsorption capacity qe was more than 90.0 mg g-1 at pH > 3.0, and was slightly decreased to 84.6 mg g-1 under strong acidic conditions due to the electrostatic repulsion. The Langmuir isotherm model fitted the adsorption data better than the Freundlich, Temkin, and Dubinin-Radushkevich isotherms models. The maximum adsorption capacity of Fe3O4@SiO2-SH for Hg(II) was 132.0 mg g-1. The adsorption kinetics were shown to follow the pseudo-second-order kinetic model, and the kinetic constant k2 was 2.4 × 10-3 g mg-1 min-1. The magnetic retrieve of the newly-developed adsorbent was easily carried out via an external magnetic field, enabling both excellent adsorbent utilization and adsorption efficiency at high Hg(II) concentrations.",

keywords = "Adsorption, FeO nanoparticles, Hg(II), SiO-coated, Thiol-functionalized",

author = "Zhuoxing Wang and Jiang Xu and Yunjun Hu and Heng Zhao and Junliang Zhou and Yu Liu and Zimo Lou and Xinhua Xu",

note = "Publisher Copyright: {\textcopyright} 2015 Taiwan Institute of Chemical Engineers.",

year = "2016",

month = mar,

day = "1",

doi = "10.1016/j.jtice.2015.10.041",

language = "English",

volume = "60",

pages = "394--402",

journal = "Journal of the Taiwan Institute of Chemical Engineers",

issn = "1876-1070",

publisher = "Taiwan Institute of Chemical Engineers",

}

TY - JOUR

T1 - Functional nanomaterials

T2 - Study on aqueous Hg(II) adsorption by magnetic Fe3O4@SiO2-SH nanoparticles

AU - Wang, Zhuoxing

AU - Xu, Jiang

AU - Hu, Yunjun

AU - Zhao, Heng

AU - Zhou, Junliang

AU - Liu, Yu

AU - Lou, Zimo

AU - Xu, Xinhua

PY - 2016/3/1

Y1 - 2016/3/1

N2 - A selective adsorbent for Hg(II) was prepared by coating Fe3O4 nanoparticles with SiO2 which was further functionalized with thiol (-SH) group. The new adsorbent (Fe3O4@SiO2-SH) was shown to adsorb aqueous Hg(II) species in a wide range of pH (1.0-8.0) conditions. The Hg(II) adsorption capacity qe was more than 90.0 mg g-1 at pH > 3.0, and was slightly decreased to 84.6 mg g-1 under strong acidic conditions due to the electrostatic repulsion. The Langmuir isotherm model fitted the adsorption data better than the Freundlich, Temkin, and Dubinin-Radushkevich isotherms models. The maximum adsorption capacity of Fe3O4@SiO2-SH for Hg(II) was 132.0 mg g-1. The adsorption kinetics were shown to follow the pseudo-second-order kinetic model, and the kinetic constant k2 was 2.4 × 10-3 g mg-1 min-1. The magnetic retrieve of the newly-developed adsorbent was easily carried out via an external magnetic field, enabling both excellent adsorbent utilization and adsorption efficiency at high Hg(II) concentrations.

AB - A selective adsorbent for Hg(II) was prepared by coating Fe3O4 nanoparticles with SiO2 which was further functionalized with thiol (-SH) group. The new adsorbent (Fe3O4@SiO2-SH) was shown to adsorb aqueous Hg(II) species in a wide range of pH (1.0-8.0) conditions. The Hg(II) adsorption capacity qe was more than 90.0 mg g-1 at pH > 3.0, and was slightly decreased to 84.6 mg g-1 under strong acidic conditions due to the electrostatic repulsion. The Langmuir isotherm model fitted the adsorption data better than the Freundlich, Temkin, and Dubinin-Radushkevich isotherms models. The maximum adsorption capacity of Fe3O4@SiO2-SH for Hg(II) was 132.0 mg g-1. The adsorption kinetics were shown to follow the pseudo-second-order kinetic model, and the kinetic constant k2 was 2.4 × 10-3 g mg-1 min-1. The magnetic retrieve of the newly-developed adsorbent was easily carried out via an external magnetic field, enabling both excellent adsorbent utilization and adsorption efficiency at high Hg(II) concentrations.

KW - Adsorption

KW - FeO nanoparticles

KW - Hg(II)

KW - SiO-coated

KW - Thiol-functionalized

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U2 - 10.1016/j.jtice.2015.10.041

DO - 10.1016/j.jtice.2015.10.041

M3 - Article

AN - SCOPUS:84958777656

SN - 1876-1070

VL - 60

SP - 394

EP - 402

JO - Journal of the Taiwan Institute of Chemical Engineers

JF - Journal of the Taiwan Institute of Chemical Engineers

ER -