3.2 Demulsification performances
Amphipathicity was a crucial characteristic for demulsifier6,14. Therefore, the wettability of the obtained MIL-100(Fe) was measured initially. As showed in Fig. S3, the water and oleic acid drops permeated into the plane of MIL-100(Fe) quickly, which suggested that the MIL-100(Fe) was amphipathic. Subsequently, the demulsification performance was investigated using MIL-100(Fe) as a heterogeneous demulsifier. Compared with the homogeneous milky model emulsion (an average diameter of 2.53 um), the demulsified liquid was transparent without obvious emulsion drops (Fig. 2a and 2b ). The demulsified MIL-100(Fe) floated on the water (Fig. 2a ), which confirmed that the oil phase released from emulsion drops by the MIL-100(Fe). At an optimal condition of dosage and concentration, the DE can exceed 99% (Fig. S4 ).