Chemistry Department, Ege University, Izmir, Turkiye.
Ilic Dursun Yildirim Vocational School, Department of Medical Services and Technicians, Erzincan Binali Yildirim University, Erzincan, Turkiye.
Environ Res. 2024 Sep 15;257:119353. doi: 10.1016/j.envres.2024.119353. Epub 2024 Jun 4.
Herein, tannic acid-tethered cellulose was developed as an efficient and selective sorbent for Mn⁺ removal from aqueous solutions. The modified cellulose was characterized through scanning electron microscopy, infrared spectroscopy, and elemental analyses. Sorption performance was evaluated using various parameters, including pH, initial Mn⁺ concentration, contact time, and the presence of interfering ions. Results indicated that Mn⁺ removal was highly pH-dependent, with removal efficiency increasing from 8% at pH 2 to99% at pH 9, achieving a remarkable 99% removal rate within only 30 min, highlighting the rapidity of the cellulose sorption kinetics. The results of isotherm studies confirmed that the sorption conformed to the Langmuir model with a monolayer sorption mechanism. Using a sorbent dose of 0.05 g, 99% of Mn⁺ could be effectively eliminated from water, achieving a maximum sorption capacity of 32.2 mg/g dry-sorbent. The modified cellulose could be effectively regenerated using 0.5-M HCl or 0.1-M H₂SO₄, with no considerable deterioration in sorption performance after three sorption-regeneration cycles. The presence of Na⁺ and K⁺ had minimal impact on Mn⁺ removal, whereas the presence of Ca⁺ and Mg⁺ at low concentrations facilitated moderate-level Mn⁺ removal.
本文中，单宁酸接枝纤维素被开发为一种从水溶液中高效选择性去除 Mn⁺的有效吸附剂。通过扫描电子显微镜、红外光谱和元素分析对改性纤维素进行了表征。通过各种参数，包括 pH 值、初始 Mn⁺浓度、接触时间和干扰离子的存在，评估了吸附性能。结果表明，Mn⁺的去除高度依赖于 pH 值，去除效率从 pH 值为 2 时的 8%增加到 pH 值为 9 时的 99%，仅在 30 分钟内即可达到 99%的去除率，这突出了纤维素吸附动力学的快速性。等温研究的结果证实，吸附符合 Langmuir 模型，具有单层吸附机制。使用 0.05 g 的吸附剂剂量，可以有效地从水中去除 99%的 Mn⁺，实现 32.2 mg/g 干吸附剂的最大吸附容量。使用 0.5-M HCl 或 0.1-M H₂SO₄ 可以有效地对改性纤维素进行再生，在经过三个吸附-再生循环后，吸附性能没有明显恶化。Na⁺和 K⁺的存在对 Mn⁺的去除影响不大，而 Ca⁺和 Mg⁺在低浓度下的存在则有利于适度去除 Mn⁺。
