Polystyrene (PS) microparticles (2 µm and 5 µm, 10 wt%) are used for the microplastic degradation studies. Briefly, 0.4 wt% PS is prepared by washing and dispersing the stock particles in 100 µL water. Similarly, a dispersion of 100 mg mL -1 of Pac-Man TiO 2 is prepared in 100 µL of water. Both these aqueous suspensions of PS and TiO 2 are mixed together in a 1:1 ratio and sonicated. 10 µL of this mixture is then drop-casted on a small petri dish, filled with 5 mL H 2 O 2 in different concentrations (1%, or 2.5%, or 5%, or 10% (w/w)) and placed in UV light (hand UV lamp from Herolab GmbH, Germany, lamp intensity 950 µW cm -2 and wavelength 365 nm) for 70 h. The distance between the sample and the UV lamp is fixed at 5 cm (Figure ). After UV irradiation, the particles are washed with ethanol and are imaged using SEM.