Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE In this study, monodisperse W/O/W emulsions were generated using a microfluidic device and subsequently used as templates to fabricate hollow porous MTB@Si–TiO2 microparticles. By incorporating magnetic Fe3O4 nanoparticles and Si–TiO2 into the microparticles, the resulting material integrates oil adsorption, magnetic recovery, and photocatalytic regeneration, enabling solvent-free regeneration without additional solvent washing.

ABSTRACT
Here, we report that hollow MTB@Si-TiO2 microparticles with a photo-responsive regeneration property were prepared for reproducible treatment of oily wastewater. Oil solutions of methyl methacrylate (MMA) and butyl methacrylate (BMA, containing oleic acid-modified ferric tetroxide (OA-Fe3O4)), a photoinitiator, a surfactant and silane-modified TiO2 nanoparticles served as the middle phase. Aqueous solutions containing glycerol and surfactant were used as the inner and outer phases. Water-in-oil-in-water (W/O/W) emulsion templates were prepared by a microfluidic emulsification method and subsequently polymerized under UV light to form photocatalytic magnetic hollow porous microparticles. The hollow MTB@Si-TiO2 microparticles exhibit high and stable adsorption performance (6.07 g/g) toward various oil–water mixtures under different conditions. In addition, cyclic oil–water separation experiments demonstrate the excellent photocatalytic regeneration capability of the microparticles and their high removal efficiency for oil and organic dyes (99.05%). Therefore, during oily wastewater treatment, the microparticles can be regenerated while directly degrading pollutants in the wastewater through photocatalysis, thereby avoiding secondary pollution caused by the use of additional solvents.