Efficient Adsorption and Removal of Organic Dyes from Wastewater Using Magnetic UiO-66 Composites

In this study, the magnetic UiO-66 composite was prepared and used as an adsorbent to effectively remove Rhodamine B (RhB) from water. The as-prepared magnetic MOFs composites not only retain the unique structure and properties of MOFs materials, but also can be quickly recovered and separated from aqueous solution by applying a magnetic field. The effects of contact time, initial concentration on the adsorption properties were studied. For RhB, pseudo-second-order model and Langmuir model could well explain the adsorption process of magnetic UiO-66 composite, indicating that the adsorption process of the RhB was mainly performed by chemisorption on uniform surface, and the maximum adsorption capacity is 188.68 mg/g. The possible mechanism for RhB was further proposed, revealing that electrostatic interactions, π-π stacking interactions mainly affected the adsorption process.