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Electrosorption of phenol in aqueous solution using a plasma-activated CNT/TiO2 electrode

SHI Zhou1 YANG Wen-hao1 YANG Ling-fang1 DENG Lin1

(1.Department of Water Engineering and Science, Hunan University, Changsha, China 410082)

【Abstract】The CNT/TiO2 composite electrode prepared by coating method was activated with radio frequency inductively coupled air-plasma. The surface morphology, wetting ability and surface elements of the plasma activated electrode were characterized by scanning electron microscopy (SEM), contact angle and X-ray photoelectron spectroscopy (XPS), respectively. It was found that the pore ratio, hydrophilic property, contents of TiO2 and oxygen containing groups on the surface of the electrode increased after the activation, which facilitated the adsorption of phenol. Cyclic voltammetry (CV) result indicated that its specific capacity also increased by 54% with the plasma treatment. Further, phenol removal efficiency for the activated electrode was enhanced by 45% compared to that of the raw electrode, and the removal of phenol increased as the increase of applied voltage and initial concentration. The adsorption process followed the pseudo-second-order kinetic model and the equilibrium adsorption isotherm well fitted the Langmuir model.

【Keywords】 plasma-activation; CNT/TiO2 electrode; phenol; electrosorption; plasma-activation; CNT/TiO_2 electrode; phenol; electrosorption;

【DOI】

【Funds】 "Twelve-Five" National Science and Technology Support Program (2012BAJ24B03)

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This Article

ISSN:1000-6923

CN: 11-2201/X

Vol 35, No. 09, Pages 2664-2669

September 2015

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Article Outline

Abstract

  • 1 Experiment
  • 2 Results and discussion
  • 3 Conclusions
  • References