State Key Laboratory of Environment-friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, PR China.
State Key Laboratory of Environment-friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, PR China; International Science and Technology Cooperation Laboratory of Micro-nanoparticle Application Research, Southwest University of Science and Technology, Mianyang, 621010, PR China.
Chemosphere. 2020 Oct;256:127139. doi: 10.1016/j.chemosphere.2020.127139. Epub 2020 May 23.
The existence of β-naphthoxyacetic acid (BNOA) pesticide in water system has aroused serious environmental problem because of its potential toxicity for humans and organisms. Therefore, exploiting an efficient method without secondary pollution is extremely urgent. Herein, a promising Ti/PbO-Co-Pr composite electrode has been successfully fabricated through simple one-step electrodeposition for efficiently electrocatalytic degradation of BNOA. Compared with Ti/PbO, Ti/PbO-Co and Ti/PbO-Pr electrodes, Ti/PbO-Co-Pr electrode with smaller pyramidal particles possesses higher oxygen evolution potential, excellent electrochemical stability and outstanding electrocatalytic activity. The optimal degradation condition is assessed by major parameters including temperature, initial pH, current density and NaSO concentration. The degradation efficiency and chemical oxygen demand removal efficiency of BNOA reach up to 94.6% and 84.6%, respectively, under optimal condition (temperature 35 °C, initial pH 5, current density 12 mA cm, NaSO concentration 8.0 g L and electrolysis time 3 h). Furthermore, Ti/PbO-Co-Pr electrode presents economic energy consumption and superior repeatability. Finally, the possible degradation mechanism of BNOA is put forward according to the main intermediate products identified by liquid chromatography-mass spectrometer. The present research paves a new path to degrade BNOA pesticide wastewater with Ti/PbO-Co-Pr electrode.
β-萘氧基乙酸（BNOA）农药在水系中的存在因其对人类和生物的潜在毒性而引起了严重的环境问题。因此，开发一种无二次污染的高效方法迫在眉睫。在此，通过简单的一步电沉积成功制备了一种有前途的 Ti/PbO-Co-Pr 复合电极，用于高效电催化降解 BNOA。与 Ti/PbO、Ti/PbO-Co 和 Ti/PbO-Pr 电极相比，具有更小的金字塔颗粒的 Ti/PbO-Co-Pr 电极具有更高的析氧电位、优异的电化学稳定性和出色的电催化活性。通过主要参数（包括温度、初始 pH 值、电流密度和 NaSO 浓度）评估最佳降解条件。在最佳条件下（温度 35°C、初始 pH 值 5、电流密度 12 mA cm、NaSO 浓度 8.0 g L 和电解时间 3 h），BNOA 的降解效率和化学需氧量去除效率分别达到 94.6%和 84.6%。此外，Ti/PbO-Co-Pr 电极具有经济的能耗和卓越的可重复性。最后，根据液相色谱-质谱仪鉴定的主要中间产物提出了 BNOA 的可能降解机制。本研究为使用 Ti/PbO-Co-Pr 电极降解 BNOA 农药废水开辟了新途径。
