4.8 Article

Adsorption of Lead(II) on O2-Plasma-Oxidized Multiwalled Carbon Nanotubes: Thermodynamics, Kinetics, and Desorption

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 3, 期 7, 页码 2585-2593

出版社

AMER CHEMICAL SOC
DOI: 10.1021/am2004202

关键词

multiwalled carbon nanotubes; O-2 plasma; adsorption; lead(II); thermodynamics; kinetics; desorption

资金

  1. Chinese Academy of Sciences, China
  2. National Key Scientific Program, Nanoscience and Nanotechnology [2011CB933700]
  3. National Natural Science Foundation of China [60801021, 20907035]

向作者/读者索取更多资源

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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