Preparation of Highly Stable DUT-52 Materials and Adsorption of Dichromate Ions in Aqueous Solution.

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.