Selective and enhanced adsorption of the monosubstituted benzenes on the Fe-modified MCM-41 : Contribution of the substituent groups

Copyright © 2019 Elsevier Ltd. All rights reserved..

The Fe-modified spherical meso-silica MCM-41 was synthesized via the base precipitation with Fe3+/urea, and the structure was characterized. Especially, the selective and enhanced adsorption characters and mechanism of the monosubstituted benzenes were investigated. The results showed that Fe modification increased the specific surface area of MCM-41 and retained the mesopore structure. Importantly, adsorption of the monosubstituted benzenes indicated that the adsorption behavior of the monosubstituted benzenes on the Fe-modified MCM-41 (Fe-MCM-41) was a monolayer adsorption on the heterogeneous surfaces, and it showed great selective adsorption towards aniline, and the maximum adsorption capacity of the Fe-MCM-41 towards aniline was 17.5 and 7.9 times of nitrobenzene and phenol. Additionally, the adsorption process and the isotherm of aniline conformed to the pseudo-second order kinetic mode and the Langmuir mode. The maximum adsorption capacity of the Fe-MCM-41 and the pure MCM-41 towards aniline were 17.9 and 1.9 mg g-1, which indicated that the Fe modification significantly enhanced the adsorption capacity of MCM-41 towards aniline. Mechanism analysis reveals that the selective adsorption of the monosubstituted benzenes was attributed to the electron donating/withdrawing capacity of the substituent groups on benzene ring. Due to the electron withdrawing capacity of O atom, the exposed Fe atom of the ferric oxide loaded in the Fe-MCM-41 gave a strong electrophilic surface, which electrostatically interacted with the electron donating group (amino) in aniline.

Medienart:

E-Artikel

Erscheinungsjahr:

2019

Erschienen:

2019

Enthalten in:

Zur Gesamtaufnahme - volume:237

Enthalten in:

Chemosphere - 237(2019) vom: 24. Dez., Seite 124546

Sprache:

Englisch

Beteiligte Personen:

Lin, Ruya [VerfasserIn]
Liang, Zhijie [VerfasserIn]
Yang, Chun [VerfasserIn]
Shi, Wenxin [VerfasserIn]
Cui, Fuyi [VerfasserIn]
Zhao, Zhiwei [VerfasserIn]

Links:

Volltext

Themen:

1K09F3G675
339NCG44TV
7631-86-9
Aniline
Aniline Compounds
Benzene
Benzene Derivatives
E57JCN6SSY
Electrostatic interaction
Fe-modification
Ferric Compounds
Ferric oxide
J64922108F
Journal Article
MCM-41
Meso-silica MCM-41
Nitrobenzene
Nitrobenzenes
Phenol
SIR7XX2F1K
Selective adsorption
Silicon Dioxide
The monosubstituted benzenes
Water Pollutants, Chemical

Anmerkungen:

Date Completed 24.12.2019

Date Revised 24.12.2019

published: Print-Electronic

Citation Status MEDLINE

doi:

10.1016/j.chemosphere.2019.124546

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM301575835