Research Advances in Supramolecular Macrocyclic Compounds for Dye Adsorption

Dyes have long been used in many industrial fields, and this has led to severe environmental water pollution, eventually posing a threat to human health. Therefore, effective removal of dyes from water is an urgent problem to be addressed. Adsorption is one of the most attractive techniques for reducing the dye content in water because of its high efficiency, simplicity, and low cost. The choice of adsorbent is critical for the efficient adsorption of dyes. Macrocyclic compounds with a large cavity as a host molecule show a strong adsorption effect on many guest molecules and have thus attracted attention as dye adsorbents. In this paper, the preparation of macrocyclic compound-based adsorbents and their applications in the removal of dyes in water are reviewed. The adsorption performance of various adsorbents are discussed, and their future development is proposed.