Electrocatalytic degradation of methylene blue on PbO2-ZrO2 nanocomposite electrodes prepared by pulse electrodeposition.
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.
Hebei University of Technology, School of Chemical Engineering and Technology, Electrochemical Surface Technology Research Laboratory, Tianjin 300130, China. Electronic address: yaoyingwu@hebut.edu.cn.
Yingwu
Y
Yao
Chunmei
C
Zhao
Manman
M
Zhao
Xiao
X
Wang
D057919:Biological Oxygen Demand Analysis; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D004572:Electrolysis; D004573:Electrolytes; D004595:Electroplating; D007854:Lead / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry; D008751:Methylene Blue / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D017971:Tin Compounds / Q000737:chemistry; D014025:Titanium / Q000737:chemistry; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction; D015040:Zirconium / Q000737:chemistry*
D004396:Coloring Agents; D004573:Electrolytes; D007854:Lead; D008751:Methylene Blue; D010087:Oxides; D010100:Oxygen; D017971:Tin Compounds; D014025:Titanium; D062065:Wastewater; D014874:Water Pollutants, Chemical; D015040:Zirconium; C047365:lead oxide; C045358:stannic oxide; C028541:zirconium oxide
Electrocatalytic degradation; Electrochemical property; Methylene blue; PbO(2)-ZrO(2) nanocomposite electrode; Pulse electrodeposition