College of Civil Engineering and Architecture , Zhejiang University of Technology , Hangzhou 310023 , China.
College of Environment , Zhejiang University of Technology , Hangzhou 310014 , China.
Environ Sci Technol. 2018 Oct 16;52(20):11735-11742. doi: 10.1021/acs.est.8b02574. Epub 2018 Sep 25.
Copper corrosion products (Cu(OH), CuO, CuO and CuCO(OH)) were applied to catalyze the reduction of N-Nitrosodimethylamine (NDMA) with iron. All the copper corrosion products showed catalytic abilities. Lower pH values and DO concentrations facilitated NDMA reduction in most cases. 1,1-dimethylhydrazine (unsymmetrical dimethylhydrazine, UDMH) and dimethylamine (DMA) formed during the degradation of NDMA. There were also some undetected products. Catalytic hydrogenation was proposed as the mechanism. The catalytic systems did not promote the formation of hydrogen atoms. The dissolved copper ions in these systems were too sparse to enhance the reaction. The smooth iron surface and formation of CuO in each catalytic system explained the enhancement of NDMA removal. Different surface morphologies and states of CuO accounted for the differences in NDMA removal and kinetics between the reaction systems. This technique could be an alternative for NDMA reduction and could broaden the application of copper corrosion products.
铜腐蚀产物（Cu(OH)、CuO、CuO 和 CuCO(OH)）被用于催化铁还原 N-亚硝基二甲胺（NDMA）。所有铜腐蚀产物都表现出催化能力。在大多数情况下，较低的 pH 值和 DO 浓度有利于 NDMA 的还原。1,1-二甲基肼（不对称二甲基肼，UDMH）和二甲胺（DMA）是在 NDMA 降解过程中形成的。还有一些未被检测到的产物。提出了催化氢化作为反应机制。催化体系并没有促进氢原子的形成。这些体系中溶解的铜离子过于稀疏，无法增强反应。每个催化体系中光滑的铁表面和 CuO 的形成解释了 NDMA 去除的增强。不同的表面形态和 CuO 的状态解释了反应体系之间 NDMA 去除和动力学的差异。该技术可作为 NDMA 还原的替代方法，并可拓宽铜腐蚀产物的应用范围。
