State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, PR China.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, PR China; School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, Guangdong 523808, PR China.
J Hazard Mater. 2017 Apr 5;327:144-152. doi: 10.1016/j.jhazmat.2016.12.056. Epub 2016 Dec 29.
We prepared a hydroxyl multi-wall carbon nanotube-modified nanocrystalline PbO anode (MWCNTs-OH-PbO) featuring high oxygen evolution potential, large effective area, and excellent electrocatalytic performance. The oxygen evolution potential and effective area of the MWCNTs-OH-PbO electrode were 1.5 and 3.7-fold higher than the traditional PbO electrode. Electrochemical degradation of pyridine in aqueous solution was investigated by using the MWCNTs-OH-PbO anode. Based on pyridine decay rate (93.8%), total organic carbon reduction (84.6%), and energy consumption (78.8WhLorder) under the optimal conditions, the MWCNTs-OH-PbO electrode modified with MWCNTs-OH concentration of 1.0gL exhibited higher electrochemical oxidation ability than the traditional PbO electrode. The intermediate, hydroxypyridine, was found at the first stage of electrolysis. The primary mineralization product, NO, was detected in aqueous solution after electrolysis. A possible electrochemical mineralization mechanism including two potential routes, i.e., via formation of small organic molecules by ring cleavage reaction and direct mineralization to CO and NO, was proposed. The results demonstrated that the MWCNTs-OH-PbO electrode exhibited high efficiency for pyridine mineralization in aqueous solution under mild conditions.
我们制备了一种羟基多壁碳纳米管修饰的纳米晶 PbO 阳极（MWCNTs-OH-PbO），其具有高析氧电位、大有效面积和优异的电催化性能。MWCNTs-OH-PbO 电极的析氧电位和有效面积分别是传统 PbO 电极的 1.5 倍和 3.7 倍。采用 MWCNTs-OH-PbO 阳极研究了水溶液中吡啶的电化学降解。在最优条件下，基于吡啶衰减率（93.8%）、总有机碳减少率（84.6%）和能量消耗（78.8WhLorder），MWCNTs-OH 浓度为 1.0gL 的 MWCNTs-OH-PbO 电极表现出比传统 PbO 电极更高的电化学氧化能力。在电解的第一阶段发现了中间产物羟吡啶。在电解后检测到水溶液中的初级矿化产物 NO。提出了一种可能的电化学矿化机制，包括两条潜在途径，即通过开环反应形成小分子有机化合物和直接矿化为 CO 和 NO。结果表明，MWCNTs-OH-PbO 电极在温和条件下对水溶液中的吡啶矿化具有高效性。
