Efficient removal of heavy metal ions by thiol-functionalized superparamagnetic carbon nanotubes

Zhang, Cheng, Sui, Jiehe, Li, Jing, Tang, Yilun and Cai, Wei (2012) Efficient removal of heavy metal ions by thiol-functionalized superparamagnetic carbon nanotubes. Chemical Engineering Journal, 210 45-52. doi:10.1016/j.cej.2012.08.062

Author Zhang, Cheng
Sui, Jiehe
Li, Jing
Tang, Yilun
Cai, Wei
Title Efficient removal of heavy metal ions by thiol-functionalized superparamagnetic carbon nanotubes
Journal name Chemical Engineering Journal   Check publisher's open access policy
ISSN 1385-8947
Publication date 2012-11-01
Sub-type Article (original research)
DOI 10.1016/j.cej.2012.08.062
Open Access Status Not yet assessed
Volume 210
Start page 45
End page 52
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
Thiol-functionalized multiwall carbon nanotube/magnetite nanocomposites (CNTs/Fe3O4) were synthesized, and were investigated by power X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray spectrometer, Fourier transform infrared spectroscopy, thermogravimetric analyses, BET analysis and physical properties measurement system. The results showed that the 3-mercaptopropyltriethoxysilane (MPTS) was successfully grafted on the surface of CNTs/Fe3O4 nanocomposites. The as-synthesized thiol-functionalized CNTs/Fe3O4 (MPTS-CNTs/Fe3O4) nanocomposites exhibited superparamagnetic property and higher specific surface area than that of CNTs/Fe3O4 nanocomposites at room temperature. The adsorption properties of Hg2+ and Pb2+ as a function of contact time, pH value and initial metal concentration were characterized by an inductively coupled plasma optical emission spectroscopy (ICP-OES). The pseudo-first-order kinetic equation could better than that of pseudo-second-order kinetic equation to describe the adsorption kinetics of the before and after thiol-functionalized nanocopmposites. The removal efficiency of CNTs/Fe3O4 nanocomposites and MPTS-CNTs/Fe3O4 nanocomposites was highly pH dependent and the optimal pH value for adsorption was 6.5. The adsorption isotherms of Hg2+ and Pb2+ by MPTS-CNTs/Fe3O4 nanocomposites matched well with the Langmuir model with the maximum adsorption capacities of 65.52 and 65.40 mg/g, respectively.
Keyword Adsorption
Heavy metal ions
Magnetic carbon nanotube
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Australian Institute for Bioengineering and Nanotechnology Publications
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 89 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 96 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Fri, 28 Oct 2016, 00:35:03 EST by Cheng Zhang on behalf of Learning and Research Services (UQ Library)