Laboratory of Microbial Biotechnology and Bioactive Molecules, Sciences and Technologies Faculty, Sidi Mohamed Ben Abdellah University, P.O. Box 2202, Fez, Morocco.
High Institute of Nursing Professions and Health Techniques Annex Taza, Fez, Morocco.
J Environ Public Health. 2022 Apr 25;2022:8502211. doi: 10.1155/2022/8502211. eCollection 2022.
This study aims to prepare activated carbon from an interesting biomaterial, corresponding to the cores of , for the first time to the best of our knowledge, according to a manufacturing process based on its chemical and thermal activation. These cores were chemically activated by sulfuric acid for 24 h and then carbonized at 500°C for 2 hours. The obtained activated carbon was characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and Brunauer-Emmett-Teller (BET) analysis. The adsorption of methylene blue (MB) on the activated carbon was evaluated, by Langmuir and Freundlich models examination, in order to explain the adsorption efficiency in a systematic and scientific way. Moreover, pseudo-first-order and pseudo-second-order kinetic models were used to identify the mechanisms of this adsorption process. The characterization results showed an important porosity (pore sizes ranging from 10 to 45 m), a surface structure having acid groups and carboxylic functions, and a specific surface of 749.6 m/g. Results of the MB adsorption showed that this process is very fast as more than 80% of MB is adsorbed during the first 20 minutes. In addition, increasing the contact time and temperature improves the MB removal process efficiency. Moreover, this adsorption's kinetic modeling follows the pseudo-second-order model. Furthermore, data on the adsorption isotherm showed a maximum adsorption capacity of 14.493 mg/g and fit better with the Langmuir model. The thermodynamic parameters (∆G, ∆S, and ∆H) indicate that the adsorption process is endothermic and spontaneous. Therefore, can be used as a low-cost available material to prepare a high-quality activated carbon having a promising potential in the wastewater treatment.
本研究首次以我们所知的最佳方式，从一种有趣的生物材料（即桃核）中制备活性炭，根据基于其化学和热激活的制造工艺。这些核首先用硫酸在 24 小时内进行化学激活，然后在 500°C 下碳化 2 小时。通过扫描电子显微镜、X 射线衍射、傅里叶变换红外光谱和 Brunauer-Emmett-Teller（BET）分析对获得的活性炭进行了表征。通过 Langmuir 和 Freundlich 模型评估了亚甲基蓝（MB）在活性炭上的吸附，以系统和科学的方式解释吸附效率。此外，还使用伪一阶和伪二阶动力学模型来识别该吸附过程的机制。表征结果表明具有重要的孔隙率（孔径范围为 10 至 45μm）、具有酸性基团和羧酸功能的表面结构以及 749.6m²/g 的比表面积。MB 吸附的结果表明，该过程非常快，因为在最初的 20 分钟内吸附了超过 80%的 MB。此外，增加接触时间和温度可以提高 MB 去除过程的效率。此外，该吸附的动力学模型遵循伪二阶模型。此外，吸附等温线的数据表明最大吸附容量为 14.493mg/g，并且与 Langmuir 模型拟合更好。热力学参数（∆G、∆S 和 ∆H）表明吸附过程是吸热和自发的。因此，可以将桃核用作制备具有废水处理有前途的高品质活性炭的低成本可用材料。
