Photocatalytic and Magnetic Janus Particles for Oil Separation and Organic Pollutant Photodegradation
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Janus particles, consisting of two distinct compartments with varied compositions or asymmetric shapes, have gained significant attention for their anisotropic properties. Particularly, Janus particles with amphiphilic surfaces work effectively as solid surfactants for stabilizing emulsions. Recent studies have demonstrated their use in oil removal from wastewater due to their anisotropic wettability and magnetic responsiveness. However, their spherical shape limits uniform compartmentalization and control over Janus balance. Snowman-like Janus particles address these issues with independently tunable compartments, offering better control and additional functionalities including catalytic activity for degrading pollutants. These particles are fabricated by swelling hydrophobic polymer cores coated with titania shells, forming snowman shapes with adjustable Janus balance for capturing oil and degrading organic dyes under UV light, and feature excellent magnetic recovery.