Abstract In this study, α-Alumina as an adsorbent was initially synthesized by combustion method and characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), EDAX and Brunauer–Emmett–Teller (BET) techniques. Then the efficiency of the synthetized adsorbent for iron (III) removal was investigated and the effect of corresponding parameters such as adsorbent dose, contact time, initial concentration, temperature and solution pH on the adsorption capacity were examined and the optimums values of these parameters were concluded upon the surfaces response method. By using response surface methodology (RSM), the adsorption experimental design was performed and the statistical analysis showed that the quadratic model as well as the model terms were significant. In addition, the experimental results were examined with some suitable models, such as Langmuir, Freundlich isotherm models, where Freundlich model fitted better our experimental results. Finally, the thermodynamic behavior of the studied adsorption process was considered and the thermodynamic functions of the process were evaluated. The results showed that the Fe (III) ion adsorption onto the synthesized adsorbent is exothermic and spontaneous at the experimental conditions.

中文翻译：

---

通过合成的α-氧化铝粉末去除铁 (ш) 的热力学研究并使用响应面法评估相应的吸附等温线模型

摘要 本研究首先采用燃烧法合成作为吸附剂的α-氧化铝，并通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、EDAX和Brunauer-Emmett-Teller（ BET) 技术。然后考察了合成的吸附剂去除铁（III）的效率，考察了吸附剂用量、接触时间、初始浓度、温度和溶液pH值等相应参数对吸附容量的影响，并确定了这些参数的最佳值。表面响应法得出结论。通过使用响应面法（RSM），进行了吸附实验设计，统计分析表明二次模型以及模型项是显着的。此外，用一些合适的模型对实验结果进行了检验，例如 Langmuir、Freundlich 等温模型，其中 Freundlich 模型更适合我们的实验结果。最后，考虑了所研究吸附过程的热力学行为，并评估了该过程的热力学函数。结果表明，在实验条件下，Fe (III) 离子吸附到合成的吸附剂上是放热和自发的。