Fabrication of In2O3 doped PbO2 anode and its application for electrochemical degradation of norfloxacin in aqueous solutions
Fabrication of In2O3 doped PbO2 anode and its application for electrochemical degradation of norfloxacin in aqueous solutions
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DOI：
10.1016/j.jece.2021.106462
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发表时间：
2021-09
影响因子：
7.7
通讯作者：
Qian Wang;Shiqi Tu;Weiyi Wang;Liyue Liu;X. Duan;Limin Chang
中科院分区：
文献类型：
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作者：
Qian Wang;Shiqi Tu;Weiyi Wang;Liyue Liu;X. Duan;Limin Chang
为了提高PbO 2电极的电化学活性和稳定性，采用复合电沉积技术在β-PbO 2活性层中掺杂In 2 O3颗粒。当In 2 O3浓度为2 mM时，In 2 O3-PbO 2电极具有较大的比表面积、较致密的晶体结构、较高的析氧电位（2.09Vvs.SCE）、较小的电荷转移电阻（64.32 Ω/cm 2）、较强的产生羟基自由基的能力（0.213 μM/min），从而具有较好的电催化活性和稳定性。电化学氧化诺氟沙星（NOR）时，在In 2 O3-PbO 2电极上NOR的去除速率比在PbO 2电极上快1.388倍。采用单变量原理考察了电流密度、初始pH、NOR初始浓度和电解质浓度对NOR去除率的影响。随着电流密度的增大和NOR初始浓度的降低，NOR去除率显著提高，在pH = 3、Na 2SO 4浓度为0.2 M时，去除效果较好。最后，对NOR的降解机理进行了探讨，提出了5种可能的降解途径。
To improve the electrochemical activity and stability of PbO2electrode, In2O3particles were doped into β-PbO2active layer by composite electrodeposition technology. When the In2O3concentration in electrodeposition solution was 2 mM, the In2O3-PbO2electrode had larger specific surface area, tighter crystal structure, higher oxygen evolution potential (2.09 V vs. SCE), smaller charge transfer resistance (64.32 Ω/cm2), stronger ability to generate hydroxyl radicals (0.213 μM/min) and thereby the better electrocatalytic activity and stability. In electrochemical oxidation of norfloxacin (NOR), the NOR removal rate at the In2O3-PbO2anode was 1.388 times faster than that at pristine PbO2electrode. Additionally, the effects of current density, initial pH, initial NOR concentration and electrolyte concentration on NOR removal efficiency were investigated by the principle of single variable. With the increase of current density and the decrease of initial NOR concentration, the NOR removal efficiency increased significantly; the better degradation effect was obtained under pH 3 and Na2SO4concentration of 0.2 M. Finally, the degradation mechanism of NOR was discussed and five possible degradation pathways were proposed.