Laboratory of Energy and Materials (LabEM), Higher School of Sciences and Technology of Hammam Sousse, Sousse University, BP 4011, Hammam Sousse, Tunisia.
Laboratory of Applied Chemistry (LCA), Faculty of Sciences Semlalia, Cadi Ayyad University, B. P. 2390, Marrakech, Morocco.
Environ Sci Pollut Res Int. 2021 Sep;28(34):46580-46591. doi: 10.1007/s11356-020-10768-2. Epub 2020 Sep 14.
The present work investigates the use of Agave americana fibers (AGF) as a precursor for activated carbon (AC) preparation via chemical activation using phosphoric acid (HPO), and the study of the influence of the preparation conditions on the adsorption capacity of the prepared AC toward Alpacide Yellow (AY). The preparation experiments have been conducted at different impregnation ratios: acid/AGF (20 g/1 g, 30 g/1 g, and 40 g/1 g) with varied impregnation times (2 h, 4 h, and 6 h) and at different carbonization temperatures (200 °C, 400 °C, and 600 °C). The impregnation ratio of 40 g/1 g, the impregnation time of 6 h, and the carbonization temperature of 400 °C were selected as the optimal conditions for the preparation of AC with enhanced properties. Despite its low specific surface area (25 m/g), the prepared AC showed a higher adsorption capacity toward AY (5.71 mg/g) as compared with that of the commercial activated carbon (CC) (5.27 mg/g) which showed a higher specific surface area (825 m/g). This could be due to the existence of pores and functional groups on the surface of AC, as evidenced by the analysis results of FTIR, DSC, and SEM. The adsorption process was found fast and fractal since it followed the kinetic model of the Brouers-Sotolongo fractal (BSf) (R = 0.999), while the mathematical modeling of the adsorption isotherm of AY on the synthesized AC was stochastic since it followed the General Brouers-Sotolongo (GBS) (R = 0.999).
本研究工作以龙舌兰麻纤维（AGF）为前驱体，采用磷酸（HPO）进行化学活化，制备活性炭（AC），并探讨了制备条件对所制备的 AC 对 Alpacide Yellow（AY）吸附性能的影响。制备实验采用不同的浸渍比（酸/AGF：20 g/1 g、30 g/1 g 和 40 g/1 g）和浸渍时间（2 h、4 h 和 6 h）以及不同的碳化温度（200°C、400°C 和 600°C）进行。选择浸渍比为 40 g/1 g、浸渍时间为 6 h、碳化温度为 400°C 作为制备具有增强性能的 AC 的最佳条件。尽管其比表面积较低（25 m/g），但所制备的 AC 对 AY 的吸附容量（5.71 mg/g）高于商业活性炭（CC）（5.27 mg/g），后者具有较高的比表面积（825 m/g）。这可能是由于 AC 表面存在孔和官能团，这可以从 FTIR、DSC 和 SEM 的分析结果得到证明。吸附过程被发现是快速和分形的，因为它遵循 Brouers-Sotolongo 分形（BSf）的动力学模型（R = 0.999），而 AY 在合成 AC 上的吸附等温线的数学建模是随机的，因为它遵循 General Brouers-Sotolongo（GBS）（R = 0.999）。
