Paluch Dorota, Wolski Robert, Bazan-Wozniak Aleksandra, Pietrzak Robert
Department of Applied Chemistry, Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznan, Poland.
Materials (Basel). 2025 Jun 24;18(13):2984. doi: 10.3390/ma18132984.
This study presents the production of activated carbon through the direct physical activation of oak bark using carbon (IV) oxide. The activation process was conducted at three distinct temperatures of 700 °C, 800 °C, and 900 °C. The activation time was 60 min. A comprehensive series of analytical procedures was performed on the resultant adsorbents. These included elemental analysis, determination of textural parameters, Boehm titration, pH determination of aqueous extracts, pH, assessment of ash content, and elemental and XPS analysis. Subsequently, adsorption tests for butyl paraben and methylene blue were carried out on the materials obtained. The total surface area of the sorbents ranged from 247 m/g to 696 m/g. The acid-based properties of the samples tested were examined, and the results indicated that the sorbents exhibited a distinct alkaline surface character. The sorption capacities of the tested samples for butylparaben ranged between 20 and 154 mg/g, while the capacities for methylene blue varied between 13 and 224 mg/g. The constants of the Langmuir and Freundlich models were determined for each of the impurities, as well as the thermodynamic parameters. The present study investigates the influence of contact time between adsorbent and adsorbate, in addition to the kinetics of the adsorption processes. The activated carbon samples obtained demonstrated satisfactory sorption capacities, with the material obtained at 900 °C exhibiting the best sorption capacities.
本研究介绍了通过使用二氧化碳对橡木树皮进行直接物理活化来生产活性炭的方法。活化过程在700℃、800℃和900℃这三个不同温度下进行。活化时间为60分钟。对所得吸附剂进行了一系列全面的分析程序。这些程序包括元素分析、结构参数测定、 Boehm滴定、水提取物的pH测定、灰分含量评估以及元素和XPS分析。随后，对获得的材料进行了对羟基苯甲酸丁酯和亚甲基蓝的吸附测试。吸附剂的总表面积在247 m²/g至696 m²/g之间。对测试样品的酸基性质进行了检查，结果表明吸附剂表现出明显的碱性表面特征。测试样品对羟基苯甲酸丁酯的吸附容量在20至154 mg/g之间，而对亚甲基蓝的吸附容量在13至224 mg/g之间。确定了每种杂质的朗缪尔和弗伦德利希模型常数以及热力学参数。本研究除了研究吸附过程的动力学外，还研究了吸附剂与吸附质之间接触时间的影响。所获得的活性炭样品表现出令人满意的吸附容量，其中在900℃下获得的材料表现出最佳的吸附容量。
