Nano-cubic structured titanium nitride particle films as cathodes for the effective electrocatalytic debromination of BDE-47
Nano-cubic structured titanium nitride particle films as cathodes for the effective electrocatalytic debromination of BDE-47
复制标题
纳米立方结构氮化钛颗粒薄膜作为阴极有效电催化脱溴 BDE-47
DOI：
10.1016/j.jhazmat.2012.06.044
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发表时间：
2012-09-15
影响因子：
13.6
通讯作者：
Quan, Xie
中科院分区：
文献类型：
--
作者：
Su, Jingyang;Lu, Na;Quan, Xie
为了有效地电催化2，2 '，4，4'-四溴二苯醚（BDE-47）的脱溴，制备了一种高能TiN阴极;这是通过将Ti箔置于TiN纳米颗粒的水悬浮液中，然后在50 ℃下干燥该系统12 h来实现的。TEM和SEM表征表明，TiN纳米颗粒为理想的纳米立方结构，均匀分布在Ti基体上，平均粒径约为50 nm。当作为阴极应用于循环伏安法测量时，TiN电极在类似于1-10的pH范围内在20次循环中表现出稳定的电化学性能。TiN阴极用于水的电化学还原（在水溶液中污染物的电催化还原期间的主要副反应）的过电位被确定为0.54V，其远高于Pt晶片（0.12V）或Pt膜（0.07V）的值。TiN电极对BDE-47的电催化脱溴表现出上级电催化活性。BDE-47在TiN阴极上的降解动力学常数为0.65 h（-1），分别是在Pt膜、Pt片和石墨阴极上的2、4和17倍。根据GC-MS对去除BDE-47后产生的中间产物的测量结果，提出了BDE-47的降解途径。
An energetic TiN cathode was fabricated for effective electrocatalytic debromination of 2,2',4,4'-tetrabromodiphenyl ethers (BDE-47); this was achieved by placing Ti foils in an aqueous suspension of TiN nanoparticles, then drying the system at 50 degrees C for 12 h. TEM and SEM characterization showed that the TiN nanoparticles-whose average size was approximately 50 nm-were ideal nano-cubic structures and distributed uniformly on the Ti substrate. When applied as a cathode in cyclic voltammetry measurements, the TiN electrode exhibited stable electrochemical performance over 20 cycles, in the similar to 1-10 pH range. The overpotential of the TiN cathode for electrochemical reduction of water (the main side reaction during the electrocatalytic reduction of pollutants in aqueous solution) was determined as 0.54V, which was much higher than the values for either a Pt wafer (0.12 V), or a Pt film (0.07 V). The TiN electrodes displayed superior electrocatalytic activity for the electrocatalytic debromination of BDE-47. The kinetic constant of BDE-47 degradation on TiN cathode is 0.65 h(-1), which was 2,4 and 17 times as much as those on Pt film, Pt wafer and graphite cathodes, respectively. A pathway was proposed for the degradation of BDE-47, based on measurements of the intermediate products resulting from the removal of BDE-47 by GC-MS. (C) 2012 Elsevier B.V. All rights reserved.