This work presents a potential boron-modified cryptomelane (B/OMS-2) material in phtocatalysis of polystyrene (PS) degradation. B/OMS-2 was prepared by using a reflux method and characteristics of crystalline cryptomelane and morphologies of nanorods were observed by conducting evidences of X-Ray diffraction patterns and scanning electron microscope images. Inductively Coupled Plasma Mass Spectrometry was also utilized to determine elemental composition of B/OMS-2 sample. The average oxidation state of manganese of the synthesized B/OMS-2 was 3.88 providing a high oxidation ability of the synthesized B/OMS-2. A hand-made polystyrene sheet (2.54 cm x7.62 cm) with 1 wt.% of B/OMS-2 (denoted by PS-B/OMS sample) and a sheet excluding B/OMS-2, namely PS sample were prepared for testing of polystyrene degradation under UV light. After the first 2 days with UV irradiation, the weight loss were 12.700 0.525 mg/cm2and 5.667 0.400 mg/cm2 for PS-B/OMS and PS samples, respectively. The wetting angle over PS-B/OMS surface noticeably decreased from 87.5 1.9 (for initial time) to 35.3 5.0 (after the two days of UV testing) while that over PS sheet slightly declined from 84.9 4.0 to 78.6 3.3 . By comparison with the PS sheet, the surface of PS-B/OMS became dull and less shiny after long term exposure to UV light suggesting a positive role of B/OMS-2 material in accelerating the polystyrene degradation under UV light
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