TY - JOUR
T1 - Hydrophobic Ce-doped β-PbO2-SDS anode achieving synergistic effects for enhanced electrocatalytic oxidation of As(III)
AU - Ji, Wenlan
AU - Wang, Yuan
AU - Xiong, Yuanjie
AU - Zhang, Tian C.
AU - Yuan, Shaojun
N1 - Funding Information:
The authors sincerely appreciate the National Natural Science Foundation of China (21978182) to support this study. The authors are thankful to Dr. Yingming Zhu from the Institute of New Energy and Low Carbon Technology of Sichuan University for the measurements of XRD, EDS, and SEM, Dr. Xiang Lin, Dr. Pan Wu, and Mr. Yuanlong Wang come from the Engineering Teaching Center, School of Chemical Engineering, Sichuan University for UV-vis tests, ICP-OES, electron spin resonance alongside electrocatalytic characterization, and Miss Panpan Li from Shiyanjia Lab (http//:www.shiyanjia.com) for XPS analyses.
Funding Information:
The authors sincerely appreciate the National Natural Science Foundation of China ( 21978182 ) to support this study. The authors are thankful to Dr. Yingming Zhu from the Institute of New Energy and Low Carbon Technology of Sichuan University for the measurements of XRD, EDS, and SEM, Dr. Xiang Lin, Dr. Pan Wu, and Mr. Yuanlong Wang come from the Engineering Teaching Center, School of Chemical Engineering, Sichuan University for UV-vis tests, ICP-OES , electron spin resonance alongside electrocatalytic characterization, and Miss Panpan Li from Shiyanjia Lab (http//:www.shiyanjia.com) for XPS analyses.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/8/1
Y1 - 2022/8/1
N2 - To strengthen the utilization of free radicals and effectively enhance electrocatalytic performance and service lifetime of the β-PbO2 electrode, herein, a novel hydrophobic TNAs/SnO2/PPy/β-PbO2-Ce-SDS (abbreviated as β-PbO2-Ce-SDS) anode was synthesized by doping Ce3+ and anionic surfactant (SDS) to TNAs/SnO2/PPy/β-PbO2 (abbreviated as β-PbO2), which was constructed by growing SnO2/PPy/β-PbO2 multilayers on TiO2 nanotube arrays (TNAs) via combination of electrodeposition and electro-polymerization processes. Notably, co-modification with Ce3+ and SDS remarkably enhanced the surface hydrophobicity, electrochemical performance and catalytic ability of β-PbO2 anode. Such β-PbO2-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-PbO2-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-PbO2 electrode decreased markedly by about 49%, owing to its appropriate surface hydrophobicity, smaller grains and denser β-PbO2 layer. The reaction mechanism of electrocatalytic oxidation was associated with synergistic effects of hydroxyl radical ([rad]OH), superoxide radicals ([rad]O2−), and sulfuric acid root radicals ([rad]SO4−). The β-PbO2-Ce-SDS anode provides a novel and feasible approach to development of various electrodes by doping metal ions and/or regulating with surfactants.
AB - To strengthen the utilization of free radicals and effectively enhance electrocatalytic performance and service lifetime of the β-PbO2 electrode, herein, a novel hydrophobic TNAs/SnO2/PPy/β-PbO2-Ce-SDS (abbreviated as β-PbO2-Ce-SDS) anode was synthesized by doping Ce3+ and anionic surfactant (SDS) to TNAs/SnO2/PPy/β-PbO2 (abbreviated as β-PbO2), which was constructed by growing SnO2/PPy/β-PbO2 multilayers on TiO2 nanotube arrays (TNAs) via combination of electrodeposition and electro-polymerization processes. Notably, co-modification with Ce3+ and SDS remarkably enhanced the surface hydrophobicity, electrochemical performance and catalytic ability of β-PbO2 anode. Such β-PbO2-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-PbO2-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-PbO2 electrode decreased markedly by about 49%, owing to its appropriate surface hydrophobicity, smaller grains and denser β-PbO2 layer. The reaction mechanism of electrocatalytic oxidation was associated with synergistic effects of hydroxyl radical ([rad]OH), superoxide radicals ([rad]O2−), and sulfuric acid root radicals ([rad]SO4−). The β-PbO2-Ce-SDS anode provides a novel and feasible approach to development of various electrodes by doping metal ions and/or regulating with surfactants.
KW - As(III)
KW - Ce-doped β-PbO
KW - Electrocatalytic oxidation
KW - SDS surfactant
KW - TiO nanotube arrays
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U2 - 10.1016/j.seppur.2022.121214
DO - 10.1016/j.seppur.2022.121214
M3 - Article
AN - SCOPUS:85129707543
SN - 1383-5866
VL - 294
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 121214
ER -