Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 263, Issue -, Pages 726-734Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2013.10.038
Keywords
Electrocatalytic degradation; Methylene blue; PbO2-ZrO2 nanocomposite electrode; Pulse electrodeposition; Electrochemical property
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Funding
- Natural Science Foundation of Hebei Province of China [B2012202002]
- Scientific and Technical Innovation Fund of Hebei University of Technology for Excellent Youth [2011010]
- Social Science Foundation of Hebei Province of China [HB12SH037]
- Scientific and Technical Research Fund of Hebei Province for Excellent Youth in University [Y2011104]
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PbO2-ZrO2 nanocomposite electrodes (P) were prepared by pulse electrodeposition and used for the electrocatalytic degradation of methylene blue (MB). The SEM and XRD tests show that PbO2-ZrO2 nanocomposite electrodes (P) possess more compact structure and finer grain size than PbO2-ZrO2 nanocomposite electrodes (D) prepared by direct electrodeposition. The electrochemical measurements show that PbO2-ZrO2 nanocomposite electrodes (P) have higher oxygen evolution overpotential and the oxidation regions of MB and water are significantly separated. The experimental parameters on electrocatalytic degradation of MB by PbO2-ZrO2 nanocomposite electrodes (P) were evaluated, such as initial MB concentration, current density, pH value and supporting electrolyte concentration. The results indicate that MB and COD removal efficiency of PbO2-ZrO2 nanocomposite electrodes (P) reach 100% and 72.7%, respectively, after 120 min electrolysis at initial 30 mg L-1 MB concentration at current density of 50 mA cm(-2) in 0.2 mol L-1 Na2SO4 supporting electrolyte solution, and the degradation of MB follows pseudo-first-order kinetics. Compared with PbO2-ZrO2 nanocomposite electrodes (D), PbO2-ZrO2 nanocomposite electrodes (P) show higher COD removal efficiency and instantaneous current efficiency with MB degradation. The experimental results demonstrate that PbO2-ZrO2 nanocomposite electrodes (P) possesses the excellent electrocatalytic properties and show great potential applications in refractory pollutants. (C) 2013 Elsevier B.V. All rights reserved.
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