The complex composition in industrial pollutants includes immiscible liquid and miscible solution that present a great challenge to deal with the effluent. In this research, the interaction between super hydrophobic surface and the miscible solution is studied based on surface tension (ST) and contact angle. A superhydrophobic surface is fabricated by simple anodisation and self-assemble method. Then two different types of miscible solution are adopted to evaluate the property of the superhydrophobic surfaces. The obtained result shows that the wettability is closely related to ST of mixtures, which is controlled by the interface component. When the ST is less than 31.55 mN m−1, the critical pressure reduced from maximum value (6442.8 Pa) to negative number. In turn, the superhydrophobic film loses its repellency and shows affinity to the mixtures. This can provide an important supplement for utilising superhydrophobic materials, especially for the oil–water separation.
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