Photoaged polystyrene microplastics serve as photosensitizers that enhance cimetidine photolysis in an aqueous environment

Differential Photoaging Effects on Colored Nanoplastics in Aquatic Environments: Physicochemical Properties and Aggregation Kinetics

“…The difference in yellowing rates of white ≈ yellow ≈ red > blue > black NPs was related to their photooxidation rates likely resulting from the different light absorbance and pigment properties (Texts S2.1 and S2.2). A similar yellowing effect was reported for white PS MPs (30 μm) after 3 days of UVC irradiation . During Step 3, five NP suspensions faded their yellowing degrees after 18 days of irradiation.…”

“…A similar yellowing effect was reported for white PS MPs (30 μm) after 3 days of UVC irradiation. 35 During Step 3, five NP suspensions faded their yellowing degrees after 18 days of irradiation. During Step 4, white and yellow NP suspensions turned transparent after 20 days of irradiation, suggesting thorough particle dissolution.…”

Photoaged Polystyrene Nanoplastics Result in Transgenerational Reproductive Toxicity Associated with the Methylation of Histone H3K4 and H3K9 in Caenorhabditis elegans

“…A previous study reported that the generation of EPFRs contributes to the formation of ROS (O 2 •– , • OH, and 1 O 2 ) on PS-MPs under light irradiation . UV irradiation primarily produces EPFRs on PS-MPs, which cause the production of • OH and O 2 •– . Another study reported that photoaging produced large amounts of O 2 •– , • OH, and 1 O 2 on PS-MPs, which correlated significantly with the production of EPFRs .…”

Efficient photodegradation of polystyrene microplastics integrated with hydrogen evolution: Uncovering degradation pathways

“…Then, the filtered ones were freeze-dried for 24 h. The photocatalytic MPs degradation was carried out in a PCX-50C Discover multi-channel photocatalytic reactor (Beijing Perfect Light Technology Co., Ltd., China) equipped with a 365 nm LED (5 W) lamp as the light source since UV radiation is considered one of the primary factors in MPs photodegradation in natural environment. 69 , 70 The reactor comprised a 50 mL sealed glass vial with a quartz bottom, as shown in Figure S1 . Before the reaction, 30 mg of PS and 50 mg of the prepared photocatalyst were added to 30 mL of ultrapure water and sonicated for 5 min.…”