Hydrophobic Ce-doped β-PbO2-SDS anode achieving synergistic effects for enhanced electrocatalytic oxidation of As(III)
To strengthen the utilization of free radicals and effectively enhance electrocatalytic performance and service lifetime of the β -PbO 2 electrode, herein, a novel hydrophobic TNAs/SnO 2 /PPy/ β -PbO 2 -Ce-SDS (abbreviated as β -PbO 2 -Ce-SDS) anode was synthesized by doping Ce 3+ and anionic surfactant (SDS) to TNAs/SnO 2 /PPy/ β -PbO 2 (abbreviated as β -PbO 2 ), which was constructed by growing SnO 2 /PPy/ β -PbO 2 multilayers on TiO 2 nanotube arrays (TNAs) via combination of electrodeposition and electro-polymerization processes. Notably, co-modification with Ce 3+ and SDS remarkably enhanced the surface hydrophobicity, electrochemical performance and catalytic ability of β -PbO 2 anode. Such β -PbO 2 -Ce-SDS anode not only substantially enhanced the As(III) conversion (96.96%) in the electrocatalytic oxidation process, but also prominently strengthened its service lifetime. Furthermore, the as-prepared β -PbO 2 -Ce-SDS anode possessed an excellent stability as its kinetic constant was only reduced from 0.18 to 0.14 min −1 even underwent 10 cycles of the electrocatalytic process, while that of the unmodified β -PbO 2 electrode decreased markedly by about 49%, owing to its appropriate surface hydrophobicity, smaller grains and denser β -PbO 2 layer. The reaction mechanism of electrocatalytic oxidation was associated with synergistic effects of hydroxyl radical ( OH), superoxide radicals ( O 2 − ), and sulfuric acid root radicals ( SO 4 − ). The β -PbO 2 -Ce-SDS anode provides a novel and feasible approach to development of various electrodes by doping metal ions and/or regulating with surfactants.
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