Modified activated carbon sorbents (ACP-Zn and ACP-Zn-Fe) had been prepared from the activation of corn husks precursor to increase the chemical activity of the resulting adsorbents by increasing the number of active functional groups and generation of micro-mesoporous structures. Fourier transform infrared (FTIR) assessed the acidic surface properties of the prepared activated carbons that is due to the presence acidic functional groups such as –OH and –COOH which improves the removal efficiency of the produced sorbents. Textural characteristics revealed the generation of micro-mesoporous structures in ACP–Zn and ACP-Zn-Fe. Thus the combination of H₃PO₄ with Zn or Zn–Fe could enhance the mesoporosity with a considerable decrease in the adsorption of nitrogen. However, the formation of mesopores might be attributed to the template-like effects of the obtained Zn- of Zn-Fe compounds inside the carbon structure. These structures were employed as sorbents for removal of hexavalent chromium Cr(VI) ions from its aqueous solutions, and the removal efficiency reached ~ 86% for ACP-Zn-Fe and ~ 82% for ACP-Zn. The kinetic modeling studies revealed that the sorption process follows the pseudo-second-order model which indicates that the mechanism of process is chemisorptions. Freundlich, Langmuir and Dubinin–Radushkevich (D–R) models were used to express the experimental data. The isotherm modeling studies revealed that the sorption process was fit with both Freundlich and Langmuir models with maximum capacity 24.8 and 30.3 mg/g for ACP-Zn and ACP-Zn-Fe, respectively.

改性活性炭吸附剂（ACP-Zn 和 ACP-Zn-Fe）通过玉米壳前体的活化制备，通过增加活性官能团的数量和微介孔结构的产生来提高所得吸附剂的化学活性。傅里叶变换红外 (FTIR) 评估了制备的活性炭的酸性表面特性，这是由于酸性官能团（如 -OH 和 -COOH）的存在，这提高了所产生的吸附剂的去除效率。纹理特征揭示了 ACP-Zn 和 ACP-Zn-Fe 中微介孔结构的产生。因此 H ₃ PO ₄的组合Zn 或 Zn-Fe 可以提高介孔率，同时显着降低氮的吸附。然而，中孔的形成可能归因于所获得的 Zn- 或 Zn-Fe 化合物在碳结构内部的模板效应。这些结构被用作吸附剂以从其水溶液中去除六价铬 Cr(VI) 离子，ACP-Zn-Fe 的去除效率达到 ~ 86%，ACP-Zn 的去除效率达到 ~82%。动力学模型研究表明吸附过程遵循伪二级模型，表明过程的机制是化学吸附。Freundlich、Langmuir 和 Dubinin-Radushkevich (D-R) 模型用于表达实验数据。