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Polietilenin Biyo-yaşlanmasi Ve Organiklerin Sorpsiyonu Üzerindeki Etkisi
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This study compared how bio-aging under aerobic and anaerobic conditions affects triclosan and trichlorophenol sorption onto high and low-density polyethylene microplastics. Results showed complex interactions where bio-aged HDPE inhibited methane production while LDPE aerobic aging increased surface carboxyl groups and altered contaminant sorption affinities.
Microplastics (MPs) are a global threat due to their ubiquitous presence and potential risks to food chain through interactions with organic contaminants (OCs). Additionally, MPs undergo aging in the environment, affecting their interaction with OCs. While UV-aging has been extensively studied, bio-aging of MPs remains underexplored. This study aims to comparatively evaluate sorption of two OCs namely, triclosan (TCS) and trichlorophenol (TCP) on pristine and bio-aged high-density polyethylene (HDPE) and low-density polyethylene (LDPE). Anaerobic and aerobic reactors containing PE were operated under mesophilic conditions to induce bio-aging on MPs, sorption experiments were then conducted with selected OCs. Results indicate that, during bio-aging, high doses of HDPE inhibit methane production, whereas LDPE induces no inhibition. This was attributed to the presence of additives in HDPE. Characterization studies revealed no change in carbonyl index (CI) for bio-aged HDPE, while CI increased for aerobic and anaerobic aged LDPE, indicating structural changes. Surface alterations, including rougher textures and minor changes in crystallinity, were observed in bio-aged MPs. Sorption results varied among OCs: (i) TCS consistently had higher sorption affinity than TCP, (ii) TCP had no affinity for anaerobically aged HDPE or LDPE, whereas sorption was favorable for aerobically aged LDPE (iii) TCS sorption capacities were similar for pristine and aerobically-aged, but lower for anaerobically-aged LDPE. Overall, there are complex interactions between MPs and microorganisms in digesters, where HDPE and LDPE do not affect and are not affected by them equally. Bio-aged PE in turn exhibits a variety of sorption affinities towards OCs tested.
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Researchers investigated how environmental aging processes change the ability of polyethylene, polypropylene, and polystyrene microplastics to absorb the antimicrobial compound triclosan. They found that aging increased sorption capacity for polyethylene but decreased it for polypropylene, with polystyrene showing mixed results depending on the aging method. The changes were driven by modifications to surface chemistry, particularly the introduction of oxygen-containing functional groups that alter hydrophobic and electrostatic interactions.
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Researchers investigated the sorption behavior of phenol, trichlorophenol (TCP), and tetrachloroethane (PCA) onto pristine and UV-aged polyethylene microplastics, finding hydrophobic interactions as the key mechanism, concentration-dependent affinity for TCP with Kpe_w values of 11-83 L/kg, and that UV aging and humic matter both influenced sorption capacity.
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Researchers investigated how UV-aging of polyethylene microplastics affects sorption of organic compounds including phenol, trichlorophenol, triclosan, and related compounds, using both empirical experiments and Linear Solvation Energy Relationship (LSER) modeling to reveal how aging-induced surface functional groups such as carbonyl, hydroxyl, and unsaturated bonds alter the sorption mechanisms.
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