Removal of cadmium from aqueous solutions by oxidized and ethylenediamine-functionalized multi-walled carbon nanotubes

被引：336

作者：

Vukovic, Goran D. ^{[1
]}

Marinkovic, Aleksandar D. ^{[1
]}

Colic, Miodrag ^{[2
]}

Ristic, Mirjana D. ^{[1
]}

Aleksic, Radoslav ^{[1
]}

Peric-Grujic, Aleksandra A. ^{[1
]}

Uskokovic, Petar S. ^{[1
]}

机构：

[1] Univ Belgrade, Fac Technol & Met, Belgrade 11120, Serbia

[2] Mil Med Acad, Inst Med Res, Belgrade 11002, Serbia

来源：

CHEMICAL ENGINEERING JOURNAL | 2010年 / 157卷 / 01期

关键词：

Cadmium adsorption; Carbon nanotubes; Amino-functionalization; Cytotoxicity; DIVALENT METAL-IONS; SURFACE-CHEMISTRY; ACTIVATED CARBON; HEAVY-METALS; COMPETITIVE ADSORPTION; CHEMICAL-MODIFICATION; CHELATING RESINS; MODIFIED BIOMASS; BIOSORPTION; PB(II);

D O I：

10.1016/j.cej.2009.11.026

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Surface functionalization of multi-walled carbon nanotubes (MWCNTs) by ethylenediamine, via chemical modification of carboxyl groups, using O-(7-azabenzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate, was performed. The resulting materials were characterized by different techniques, such as FTIR, TGA and elemental analysis. Biocompatibility studies showed that the functionalized MWCNTs, at concentrations between 1 and 50 mu g mL(-1), were not cytotoxic for the fibroblast L929 cell line. In batch tests, the influences of solution pH, contact time, initial metal ion concentration and temperature on the sorption of Cd2+ ions onto raw-MWCNTs (raw-MWCNT), oxidized MWCNTs (o-MWCNT) and ethylenediamine-functionalized MWCNTs (e-MWCNT) were studied. The adsorption of Cd2+ ions by o-MWCNT and e-MWCNT was strongly pH dependent. The time dependent Cd2+ sorption onto raw-MWCNT, o-MWCNT and e-MWCNT can be described by a pseudo-second-order kinetic model. The Langmuir isotherm model agrees well with the equilibrium experimental data. The maximum capacity was obtained for e-MWCNT, 25.7 mgg(-1), at 45 degrees C. The thermodynamic parameters were also deduced for the adsorption of Cd2+ ions on raw-MWCNT, o-MWCNT and e-MWCNT and the results showed that the adsorption was spontaneous and endothermic. (C) 2009 Elsevier B. V. All rights reserved.

引用

页码：238 / 248

页数：11

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