Nanoscale copper-nickel binary oxysulfide (CuNiOS) was for the first time synthesized by a co-precipitation method and characterized by scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and Brunauer-Emmett-Teller (BET). CuNiOS was used as a catalyst for the degradation of aniline by peroxydisulfate (PDS) and its catalytic performance was investigated via various impact factors including catalyst loading, PDS and aniline concentrations as well as solution initial pH. The results demonstrate that CuNiOS had highly catalytic activity and approximately 80% of total organic carbon of aniline solution (0.1 mM) was removed within 20 min. Copper and nickel ions on the surface of catalyst are the critical catalytic centers to activate PDS. The components of copper and nickel in the catalyst exhibited an excellent synergistic role in the degradation of aniline. The analyses of electron paramagnetic resonance (EPR) and the experiments of radical quenching confirmed the generation of SO and OH in the reaction system, both of which were responsible for the degradation of aniline. The intermediates of aniline degradation were identified by UPLC-MS and the possible pathways of aniline degradation are further proposed. Based on the results obtained in this study, it is educed that CuNiOS-catalyzed PDS is a promising approach to the treatment of the wastewater containing aniline.

中文翻译：

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铜镍二元硫氧化物活化过二硫酸盐快速降解苯胺

首次采用共沉淀法合成了纳米级铜镍二元硫氧化物（CuNiOS），并通过扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、X射线衍射（XRD）、傅里叶变换等手段对其进行了表征红外 (FTIR) 和 Brunauer-Emmett-Teller (BET)。 CuNiOS 被用作过二硫酸盐（PDS）降解苯胺的催化剂，并通过各种影响因素（包括催化剂负载量、PDS 和苯胺浓度以及溶液初始 pH 值）研究其催化性能。结果表明，CuNiOS具有很高的催化活性，苯胺溶液（0.1 mM）中约80%的总有机碳在20分钟内被去除。催化剂表面的铜离子和镍离子是活化PDS的关键催化中心。催化剂中的铜和镍组分对苯胺的降解表现出优异的协同作用。电子顺磁共振（EPR）分析和自由基猝灭实验证实反应体系中生成了SO和OH，这两者都是苯胺降解的原因。通过UPLC-MS鉴定了苯胺降解的中间产物，并进一步提出了苯胺降解的可能途径。根据本研究的结果，CuNiOS 催化的 PDS 是处理含苯胺废水的一种有前景的方法。