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

Highly stableDUT-52materials were synthesized by the hydrothermalmethod and well-characterized by X-ray diffraction, thermogravimetric analysis,scanning electron microscopy, and X-ray photoelectron spectroscopy (XPS). In orderto systematically study the adsorption of dichromate ions in aqueous solution by theDUT-52materials, a single factor experiment, kinetic experiment, thermodynamicexperiment, competition ion experiment, and material regeneration experiment weredesigned. Based on the H-bond interaction between the dichromate ions and the Hatoms of a NDC2-ligand, theDUT-52materials showed a maximum removal rate of96.4% and a maximum adsorption capacity of 120.68 mgmiddotg-1with excellent selectiveadsorption and material regeneration. In addition, the process of adsorption ofdichromate ions by theDUT-52materials is in accordance with the pseudo second-order kinetics and Langmuir models, and the adsorption mechanism and the importantrole of the H-bond interaction were reasonably explained using the XPS pattern andtheoretical calculation. Accordingly,DUT-52can be regarded as a multifunctionalmaterial for efficiently removing dichromate ions from the wastewater.

Automated summary

Highly stable DUT-52 materials were synthesized and showed excellent adsorption performance for dichromate ions in aqueous solution. The adsorption process followed pseudo second-order kinetics and Langmuir models. The H-bond interaction played an important role in the adsorption mechanism.