Abstract Phenol and its derivatives are considered as dangerous pollutants due to these harmful effects on health and the environment. Treatment of the waters charged by these compounds by adsorption remains very important. For these reasons, this study was designed to prepare nickel oxide by precipitation method in order to remove these pollutants from aquatic environments. Indeed, structural and textural properties of this solid have been determined by various physicochemical methods (X-ray diffraction, Fourier transform in the infrared, N2 adsorption/desorption (BET), ATD / ATG thermal analysis and scanning electron microscopy (SEM)). In addition, several adsorption tests were carried out in order to show the effectiveness of this solid for the elimination of phenol in aqueous solution and to determine the physicochemical parameters which affect adsorption. Our results have shown 5.29 mg·g−1 of adsorption capacity with 98% of yield. Furthermore, it was shown that adsorption process was endothermic. For the kinetic study, it was demonstrated that phenol adsorption on NiO follows the pseudo-second-order and the Langmuir model better adaptable for the isotherm of desorption. Moreover, thermodynamic study shows positive values of ΔS ° (266.6 JK−1·mol−1) suggesting a randomness increase of the solid/liquid interface. ΔH ° (60.41 kJ·mol−1) was also positive confirming the endothermic nature of the adsorption processes. However, ΔG ° (kJ·mol−1) was negative suggesting the spontaneity of the phenol adsorption. In summary, this work suggests that phenol adsorption on NiO was linked to the chemical adsorbate/adsorbent interactions.

中文翻译：

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氧化镍去除苯酚的吸附性能研究

摘要 苯酚及其衍生物由于对健康和环境的有害影响而被认为是危险的污染物。通过吸附处理由这些化合物带电的水仍然非常重要。由于这些原因，本研究旨在通过沉淀法制备氧化镍，以从水生环境中去除这些污染物。事实上，这种固体的结构和质地特性已通过各种物理化学方法（X 射线衍射、红外傅里叶变换、N2 吸附/解吸 (BET)、ATD/ATG 热分析和扫描电子显微镜 (SEM)）确定。此外，进行了几次吸附试验，以证明这种固体在去除水溶液中的苯酚方面的有效性，并确定影响吸附的物理化学参数。我们的结果表明吸附容量为 5.29 mg·g-1，产率为 98%。此外，表明吸附过程是吸热的。对于动力学研究，表明苯酚在 NiO 上的吸附遵循伪二级，朗缪尔模型更适合解吸等温线。此外，热力学研究显示 ΔS ° (266.6 JK-1·mol-1) 为正值，表明固/液界面的随机性增加。ΔH° (60.41 kJ·mol-1) 也是正值，证实了吸附过程的吸热性质。然而，ΔG° (kJ·mol-1) 为负值，表明苯酚吸附是自发性的。总之，这项工作表明 NiO 上的苯酚吸附与化学吸附物/吸附剂相互作用有关。