Construction of a Pr/CDs/SSS/PbO2 composite electrode for highly efficient degradation of organic pollutants†

IF 2.6 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY CrystEngComm Pub Date : 2024-10-18 DOI:10.1039/D4CE00791C
Hui Li, Guiyun Yi, Yuanfeng Wu, Xikui Wang, Baolin Xing and Yulong Zhang
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Abstract

In this study, a Pr/CDs/SSS/PbO2 electrode with good electrocatalytic activity and superior stability was successfully prepared by an electrodeposition process. XRD results showed that the doping of the Pr element inhibited the PbO2 crystal growth, resulting in the complete disappearance of the α-PbO2 diffraction peaks. Compared with the pure PbO2 electrode, the Pr/CDs/SSS/PbO2 electrode possesses a smaller grain size and a more compact electrode surface structure. In addition, the results of XRD and XPS confirmed that Pr3+ and Pr4+ existed simultaneously in the electrode, which increased the oxygen precipitation over potential (1.96 V) and reduced the interfacial resistance (5.01 Ω) of the Pr/CDs/SSS/PbO2 electrode. Significantly, the prepared Pr/CDs/SSS/PbO2 electrode showed the highest catalytic activity when the electrode was prepared in 5 mmol L−1 of Pr-containing solution, and the degradation of MB by the Pr/CDs/SSS/PbO2 electrode was 98.2% after 180 min of degradation under the conditions: 50 mg L−1 of MB, pH = 5, and 30 mA cm−2 of current density. The removal rate of TOC was 58%, which was much higher than that of the pure PbO2 electrode (3.44%). In general, the Pr/CDs/SSS/PbO2 electrode can be considered an efficient and low-cost anode material for the electrochemical treatment of organic wastewater.

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构建用于高效降解有机污染物的 Pr/CDs/SSS/PbO2 复合电极†。
本研究通过电沉积工艺成功制备了具有良好电催化活性和卓越稳定性的 Pr/CDs/SSS/PbO2 电极。XRD 结果表明,Pr 元素的掺杂抑制了 PbO2 晶体的生长,导致 α-PbO2 衍射峰完全消失。与纯 PbO2 电极相比,Pr/CDs/SSS/PbO2 电极的晶粒尺寸更小,电极表面结构更紧凑。此外,XRD 和 XPS 的结果证实,Pr3+ 和 Pr4+ 同时存在于电极中,从而提高了 Pr/CDs/SSS/PbO2 电极的氧析出过电位(1.96 V),降低了界面电阻(5.01 Ω)。值得注意的是,在 5 mmol L-1 的含 Pr 溶液中制备的 Pr/CDs/SSS/PbO2 电极显示出最高的催化活性,在下列条件下,Pr/CDs/SSSS/PbO2 电极对 MB 的降解在 180 分钟后达到 98.2%:在下列条件下,Pr/CDs/SSS/PbO2 电极对甲基溴的降解率为 98.2%:甲基溴 50 mg L-1、pH = 5、电流密度 30 mA cm-2。TOC 的去除率为 58%,远高于纯 PbO2 电极的去除率(3.44%)。总之,Pr/CDs/SSS/PbO2 电极可视为电化学处理有机废水的一种高效、低成本阳极材料。
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来源期刊
CrystEngComm
CrystEngComm 化学-化学综合
CiteScore
5.50
自引率
9.70%
发文量
747
审稿时长
1.7 months
期刊介绍: Design and understanding of solid-state and crystalline materials
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