In this study, MoS/g-CN heterojunction photocatalysts were fabricated in order to treat ammonia–nitrogen wastewater resulting from the production of ternary cathode material precursors used in the manufacture of lithium-ion batteries. The catalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), N adsorption–desorption test, UV–Vis diffuse reflectance spectra (UV–Vis DRS), Fourier-transform infrared spectroscopy (FT-IR Nicolet 6700), energy dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The catalytic efficiency of the catalysts on ammonia–nitrogen and Ni/Co ammonia complexes in the wastewater was investigated by varying MoS doping, catalyst dose, adsorption duration, and photocatalysis duration. The results showed 2.0 g/L of MoS/g-CN-1 wt% (photocatalyst with a content of 1 wt% MoS) has the best photocatalytic efficiency. A degradation efficiency of 87.52 % for ammonia–nitrogen, 98.34 % for nickel and 97.80 % for cobalt was reached after one hour of dark adsorption and four hours of illumination. EDS and XPS analysis revealed that Ni/Ni and Co/Co were adsorbed from the solution onto the catalyst surface, and that NH/NH was converted into NO and N.

中文翻译：

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构建MoS2/g-C3N4异质结光催化氧化降解三元前驱体废水中氨氮和Ni/Co氨络合物：性能与机理

在这项研究中，制备了MoS/g-CN异质结光催化剂，以处理用于制造锂离子电池的三元正极材料前驱体产生的氨氮废水。通过扫描电子显微镜（SEM）、X射线衍射（XRD）、N吸附-脱附测试、紫外-可见漫反射光谱（UV-Vis DRS）、傅里叶变换红外光谱（FT-IR Nicolet 6700）对催化剂进行了表征)、能量色散 X 射线光谱 (EDS) 和 X 射线光电子能谱 (XPS)。通过改变MoS掺杂、催化剂剂量、吸附持续时间和光催化持续时间，研究了催化剂对废水中氨氮和Ni/Co氨络合物的催化效率。结果表明，2.0 g/L的MoS/g-CN-1 wt%（MoS含量为1 wt%的光催化剂）具有最佳的光催化效率。经过 1 小时的暗吸附和 4 小时的光照后，氨氮、镍和钴的降解效率分别为 87.52%、98.34% 和 97.80%。 EDS和XPS分析表明Ni/Ni和Co/Co从溶液中吸附到催化剂表面，并且NH/NH转化为NO和N。