A novel β-CD/MGO-SO3H composites were firstly synthesized.
The composite showed fast adsorption rates of Cr (VI) and Hg (II) ions.
Effect of adsorption was obtained in Cr (VI) and Hg (II) binary system.
The adsorption mechanism of the β-CD/MGO-SO3H was investigated and predicted.
The removal of metals was a chemical process.