Abstract A natural waste material, pressed black cumin cake, was characterized as an adsorbent for copper (II) ions. The pressed black cumin cake waste was obtained after the cold pressing of black cumin seeds in order to extract black cumin oil. The press cake was used as an adsorbent after washing with cold water for the removal of copper (II) ions. The effects of pH and adsorbent dose on the removal efficiencies were investigated. The point of the zero charge was determined. Isotherm studies were performed using Langmuir, Freundlich, and Dubinin-Radushkevich models. The adsorption of the copper (II) was found to comply with the Langmuir isotherm model. The maximum adsorption capacity calculated from the Langmuir isotherm was found to be 106.38 mg/g. Thermodynamic studies were also carried out. Furthermore, three kinetic models, the pseudo first-order, pseudo second-order, and intraparticle diffusion, were investigated. The adsorption adhered to the pseudo second order kinetic model. The regeneration of the adsorbent was also investigated. An environmentally friendly, low cost, fast, and easily accessible adsorbent was developed for the efficient removal of copper (II). It is advantageous in terms of stability for long-term use.

中文翻译：

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天然副产品材料对铜的生物吸附：压制黑孜然蛋糕

摘要 一种天然废料，压榨的黑孜然饼，被表征为铜 (​​II) 离子的吸附剂。压榨黑孜然饼渣是将黑孜然籽冷压后提取黑孜然油。滤饼在用冷水洗涤后用作吸附剂以去除铜 (II) 离子。研究了 pH 值和吸附剂剂量对去除效率的影响。确定零电荷点。使用 Langmuir、Freundlich 和 Dubinin-Radushkevich 模型进行等温线研究。发现铜 (II) 的吸附符合朗缪尔等温线模型。发现从朗缪尔等温线计算的最大吸附容量为 106.38 毫克/克。还进行了热力学研究。此外，三个动力学模型，研究了伪一阶、伪二阶和粒子内扩散。吸附遵循准二级动力学模型。还研究了吸附剂的再生。开发了一种环保、低成本、快速且易于获取的吸附剂，用于有效去除铜 (II)。在长期使用的稳定性方面是有利的。