title: Effect of matrix on the electrochemical characteristics of TiO₂ nanotube array-based PbO₂ electrode for pollutant degradation.
abstract: A series of lead dioxide electrodes developed on titania nanotube arrays with different matrix were fabricated by electrodeposition. Before the deposition of PbO₂, the matrix of this anode was electrochemically reduced in (NH₄)₂SO₄ solution and/or pre-deposited with certain amounts of copper. To gain insight into these pretreatments, the PbO₂ electrodes were characterized by SEM, LSV, and XRD, and their electrocatalytic activities for pollutant degradation were compared using p-nitrophenol (p-NP) as a model. It was confirmed that the electrochemical reduction with (NH4)₂SO₄ resulted in the partial conversion of TiO₂ into Ti₄O₇ and Ti₅O₉, which increased the conductivity of PbO₂ anode, but decreased its electrochemical activity, while the Ti/TNTs*-Cu/PbO₂ electrode with both pretreatments possessed the highest oxygen evolution overpotential of 2.5 V (vs. SCE) and low substrate resistance. After a 180-min treatment on this electrode, the removal efficiency of p-NP reached 82.5% and the COD removal achieved 42.5% with the energy consumption of 9.45 kWh m(-3), demonstrating the best performance among these electrodes with different matrices. Therefore, this titania nanotube array-based PbO₂ electrode has a promising application in the industrial wastewater treatment.
authors.affiliation: Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300071, China.
authors.forename: Zhongxin
authors.initials: Z
authors.lastname: Hu
authors.forename: Minghua
authors.initials: M
authors.lastname: Zhou
authors.forename: Lei
authors.initials: L
authors.lastname: Zhou
authors.forename: Yunlin
authors.initials: Y
authors.lastname: Li
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
mesh_terms: D057919:Biological Oxygen Demand Analysis; D003300:Copper / Q000737:chemistry; D004563:Electrochemistry; D004566:Electrodes; D004595:Electroplating; D007854:Lead / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry*; D009596:Nitrophenols / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D009596:Nitrophenols; D010087:Oxides; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D007854:Lead; C047365:lead oxide; D003300:Copper; D014025:Titanium; C024836:4-nitrophenol