Shen Yanqiong, Duan Ruru, Qian Jinjie, Li Qipeng
College of Chemistry and Chemical Engineering, Zhaotong University, Zhaotong 657000, P. R. China.
College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, P. R. China.
ACS Omega. 2022 May 5;7(19):16414-16421. doi: 10.1021/acsomega.2c00373. eCollection 2022 May 17.
Highly stable materials were synthesized by the hydrothermal method and well-characterized by X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and X-ray photoelectron spectroscopy (XPS). In order to systematically study the adsorption of dichromate ions in aqueous solution by the materials, a single factor experiment, kinetic experiment, thermodynamic experiment, competition ion experiment, and material regeneration experiment were designed. Based on the H-bond interaction between the dichromate ions and the H atoms of a NDC ligand, the materials showed a maximum removal rate of 96.4% and a maximum adsorption capacity of 120.68 mg·g with excellent selective adsorption and material regeneration. In addition, the process of adsorption of dichromate ions by the materials is in accordance with the pseudo second-order kinetics and Langmuir models, and the adsorption mechanism and the important role of the H-bond interaction were reasonably explained using the XPS pattern and theoretical calculation. Accordingly, can be regarded as a multifunctional material for efficiently removing dichromate ions from the wastewater.
通过水热法合成了高稳定性材料，并通过X射线衍射、热重分析、扫描电子显微镜和X射线光电子能谱（XPS）对其进行了充分表征。为了系统研究该材料对水溶液中重铬酸根离子的吸附情况，设计了单因素实验、动力学实验、热力学实验、竞争离子实验和材料再生实验。基于重铬酸根离子与NDC配体的H原子之间的氢键相互作用，该材料表现出96.4%的最大去除率和120.68 mg·g的最大吸附容量，具有优异的选择性吸附和材料再生性能。此外，该材料对重铬酸根离子的吸附过程符合准二级动力学和朗缪尔模型，并利用XPS图谱和理论计算合理地解释了吸附机理以及氢键相互作用的重要作用。因此，该材料可被视为一种用于高效去除废水中重铬酸根离子的多功能材料。
