Heavy metal ions (HMIs) are exceedingly hazardous to both humans and the environment, and the necessity to eliminate them from aqueous systems prompted the development of novel materials. In this study, tris(2-benzimidazolylmethyl)amine (NTB) was impregnated into MIL-101-(Cr) metal-organic framework using an incipient wetness impregnation approach, and the ability of the composite material to adsorb Hg2+ ions from the water was examined. The synthesized materials were analyzed with several physico-chemical techniques such as powder X-ray diffraction, elemental analysis, scanning electron microscopy, thermogravimetric analysis, nitrogen sorption isotherms at 77 K, and X-ray photoelectron spectrometry. MIL-101-NTB quickly adsorbs 93.9% of Hg2+ ions within 10 min from a 10.0 ppm single ion solution. A better fit of the kinetic data to a pseudo-second-order model validated the chemisorption of Hg2+ ions on MIL-101-NTB. The experimental data fitted well with the Langmuir isotherm model, and the maximum adsorption capacity obtained at 125 ppm initial concentration was 111.03 mg/g. Despite the presence of other competing ions (Cu2+, Pb2+, and Cd2+), high Hg2+ ions removal efficiency (99.6%, 1.0 ppm initial concentration) was maintained in the diverse ion batch adsorption studies. A 0.2 M EDTA solution could desorb the Hg2+ ions, and cyclic Hg2+ ions sorption studies indicated that MIL-101-NTB might have a high Hg2+ ions removal efficiency for at least five consecutive cycles. Based on the FTIR and XPS analyses, Hg2+ ions chelation by NTB molecules and electrostatic interactions between Hg2+ ions and carboxylate groups in MIL-101-NTB are plausible mechanisms for Hg2+ ions adsorption.

中文翻译：

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三(2-苯并咪唑基)胺 (NTB) 改性金属有机框架：制备、表征和汞离子去除研究

重金属离子 (HMI) 对人类和环境都极其危险，从水系统中消除它们的必要性促进了新型材料的开发。本研究采用初湿浸渍法将三(2-苯并咪唑基甲基)胺(NTB)浸渍到MIL-101-(Cr)金属有机骨架中，复合材料吸附水中Hg2+离子的能力为检查了。采用粉末 X 射线衍射、元素分析、扫描电子显微镜、热重分析、77 K 氮吸附等温线和 X 射线光电子能谱等多种物理化学技术对合成材料进行了分析。MIL-101-NTB 可在 10 分钟内从 10.0 ppm 单离子溶液中快速吸附 93.9% 的 Hg2+ 离子。动力学数据与伪二阶模型的更好拟合验证了 MIL-101-NTB 上 Hg2+ 离子的化学吸附。实验数据与Langmuir等温线模型吻合较好，在125 ppm初始浓度下获得的最大吸附容量为111.03 mg/g。尽管存在其他竞争离子（Cu2+、Pb2+ 和 Cd2+），但在不同的离子批次吸附研究中仍保持了高 Hg2+ 离子去除效率（99.6%，1.0 ppm 初始浓度）。0.2 M EDTA 溶液可以解吸 Hg2+ 离子，循环 Hg2+ 离子吸附研究表明，MIL-101-NTB 可能在至少五个连续循环中具有较高的 Hg2+ 离子去除效率。基于 FTIR 和 XPS 分析，