Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 3, Issue 7, Pages 2585-2593Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am2004202
Keywords
multiwalled carbon nanotubes; O-2 plasma; adsorption; lead(II); thermodynamics; kinetics; desorption
Funding
- Chinese Academy of Sciences, China
- National Key Scientific Program, Nanoscience and Nanotechnology [2011CB933700]
- National Natural Science Foundation of China [60801021, 20907035]
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O-2-plasma-oxidized multiwalled carbon nanotubes (po-MVVCNTs) have been used as an adsorbent for adsorption of lead(II) in water. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Raman spectroscopy measurements show that the bulk properties of MINCNTs were not changed after O-2-plasma oxidation. The adsorption capacity of MWCNTs for lead(II) was greatly enhanced after plasma oxidation mainly because of the introduction of oxygen-containing functional groups onto the surface of MWCNTs. The removal of lead(II) by po-MWCNTs occurs rather quickly, and the adsorption kinetics can be well described by the pseudo-second-order model. The adsorption isotherm of lead(II) onto MWCNTs fits the Langmuir isotherm model. The adsorption of lead(II) onto MIATCNTs is strongly dependent upon the pH values. X-ray photoelectron spectroscopy analysis shows that the adsorption mechanism is mainly due to the chemical interaction between lead(II) and the surface functional groups of po-MWCNTs. The thermodynamic parameters (Delta H degrees, Delta S degrees, and Delta G degrees) calculated from the adsorption isotherms suggest that the adsorption of lead(II) onto MWCNTs is endothermic and spontaneous. The regeneration performance shows that lead(II) can be easily regenerated from po-MVVCNTs by altering the pH values of the solution.
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