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Weathering effect triggers the sorption enhancement of microplastics against oxybenzone

Environmental Technology & Innovation 2023 39 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 60 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Saravanan Rajendran, Fahir Hassan, Navish Kataria, Jihan Nabillah Hanun, Jihan Nabillah Hanun, Jheng‐Jie Jiang, Jihan Nabillah Hanun, Navish Kataria, Jihan Nabillah Hanun Jihan Nabillah Hanun Jihan Nabillah Hanun Fahir Hassan, Navish Kataria, Jihan Nabillah Hanun, Jihan Nabillah Hanun, Jihan Nabillah Hanun Jihan Nabillah Hanun How‐Ran Chao, Kuan Shiong Khoo, Fahir Hassan, Fahir Hassan, Navish Kataria, Fahir Hassan, Fahir Hassan, Navish Kataria, Fahir Hassan, Kuan Shiong Khoo, Navish Kataria, Navish Kataria, Navish Kataria, Navish Kataria, Ledy Theresia, Ledy Theresia, How‐Ran Chao, Saravanan Rajendran, Fahir Hassan, Fahir Hassan, Kuan Shiong Khoo, Saravanan Rajendran, Jheng‐Jie Jiang, Pau Loke Show, How‐Ran Chao, Saravanan Rajendran, Navish Kataria, Jheng‐Jie Jiang, Kuan Shiong Khoo, Pau Loke Show, Jheng‐Jie Jiang, Jheng‐Jie Jiang, Pau Loke Show, Saravanan Rajendran, Ha Manh Bu, Ha Manh Bu, Pau Loke Show, Kuan Shiong Khoo, Saravanan Rajendran, Jheng‐Jie Jiang, Pau Loke Show, Pau Loke Show, Pau Loke Show, Kuan Shiong Khoo, Kuan Shiong Khoo, Navish Kataria, Pau Loke Show, Kuan Shiong Khoo, Navish Kataria, Kuan Shiong Khoo, Jheng‐Jie Jiang, Kuan Shiong Khoo, Kuan Shiong Khoo, Pau Loke Show, Kuan Shiong Khoo, Chi-Fu Yeh, Jheng‐Jie Jiang, Pau Loke Show, Pau Loke Show, Saravanan Rajendran, Kuan Shiong Khoo, Chi-Fu Yeh, Kuan Shiong Khoo, Kuan Shiong Khoo, Pau Loke Show, Pau Loke Show, Pau Loke Show, Navish Kataria, Jheng‐Jie Jiang, Navish Kataria, Kuan Shiong Khoo, Kuan Shiong Khoo, Jheng‐Jie Jiang, Pau Loke Show, Jheng‐Jie Jiang, Pau Loke Show, Jheng‐Jie Jiang, Kuan Shiong Khoo, Fahir Hassan, Jihan Nabillah Hanun, Jihan Nabillah Hanun

Summary

Researchers found that weathering in air, seawater, and freshwater makes PET microplastics absorb significantly more oxybenzone, a common sunscreen chemical, than fresh plastic does. Aging creates surface cracks and new chemical groups that increase the plastic's ability to bind pollutants. The study suggests that as microplastics weather in the environment, they become more effective carriers of harmful chemicals.

Polymers

PE PET

Study Type Environmental

Microplastics are a growing concern due to their potential negative environmental and human health impacts. This study investigated the physiochemical changes in polyethylene terephthalate (PET) microplastics upon aging in air, seawater, and freshwater through exposure to Xenon light (artificial aging) and sun (natural aging). We used SEM to examine the surface morphology of natural and aged PET microplastics and found that aged particles exhibited mechanical grinding, irregular wrinkles, cracks, and a small subset of mesopores. FTIR analysis revealed that microplastics were degraded through an oxidation process, resulting in the appearance of carboxyl and hydroxyl groups. BET analysis showed that freshwater-aged microplastics had the highest specific surface area (SBET) value. We also studied the sorption behavior of oxybenzone, a UV filter compound, onto microplastic particles. Our results indicated that the sorption behavior followed the pseudo-second-order model, with hydrophobic interactions and hydrogen bonding formation as the main mechanisms. The equilibrium adsorption values for aged microplastics increased from 6.62 to 9.10 mg/g for air, seawater, and freshwater, respectively, compared to 6.44 mg/g for virgin microplastics. The sorption isotherm experiments showed that the Langmuir model could represent the sorption mechanism of the virgin materials, while air- and seawater-aged microplastics were more accurately described using the Freundlich isotherm model. The initial concentrations of oxybenzone in the background solutions exhibited an increasing trend with increasing concentrations, and pH values showed different effects on microplastic sorption capacity depending on the age of the microplastics and the solution pH. Our results suggest that microplastics exhibit an increasing trend in enhanced sorption capacity from virgin to aged conditions, with uneven distribution of active groups on each surface area due to uneven crack formation. Further research is needed to explore desorption experiments using aged microplastics from natural resources.

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