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Isolating micro/nanoplastics from organic-rich wastewater: Co/PMS outweighs Fenton system
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Researchers compared two chemical systems for isolating microplastics from organic-rich wastewater and found that a cobalt-based system was far faster and more effective than the traditional Fenton method. The cobalt system completed the isolation of micro- and nanoplastics in just 30 minutes, compared to over 5 hours for the older approach. The study offers a more practical laboratory method for accurately measuring microplastic contamination in complex water samples.
Rapid isolation of microplastics is the prerequisite for correct and in-depth understanding of their environmental impacts and human health threats. And Fenton's reagent (Fe/HO system, FHS) has been proven to be a viable way to isolate microplastics from wastewater, but it is limited because of harsh reaction conditions, long reaction time and low efficiency. Herein, it's proven that the Fenton-like system, which is using Cobalt (II) salts to decompose potassium peroxymonosulfate (Co/PMS system, CPS) with generation of O, can offer shorter time (within 30 min) in complex sample isolation. The experimental results showed that the isolation time of micro/nanoplastics from pollutants with CPS in only 30 min, while it was at least more than 5 h with FHS. Via a serious of experiments of comparison and characterization between FHS and CPS, whether from the point of view of reaction time or isolation effect, CPS is superior to FHS. On this basis, we validate the applicability of this system (CPS) in different reaction conditions (concentration, pH), different sizes (from microns to nanometers) and types of plastic (PS, PA, PE, PP, PVC). In addition, the CPS can also preserve the integrity of the plastic itself and reduce the impact on the quality of samples evidenced by a variety of characterization of physicochemical structure like UV-vis, TEM, AFM, FTIR and XPS. CPS is proved to be faster, higher, stronger for enhancing the isolation of micro/nanoplastics from complex matrix. In a word, this study provides a promising solution for the efficient isolation of microplastics from wastewater without causing additional harm to the plastics.
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Researchers showed that Fenton's reagent — a low-cost oxidizing chemical — can efficiently remove organic matter from wastewater samples to isolate microplastics without damaging the particles or altering their chemical identity. The method reduces sample preparation time significantly compared to existing techniques and is compatible with downstream FT-IR analysis.
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Researchers tested four common laboratory methods for extracting microplastics from complex samples like soil and sewage sludge to determine which best preserves the plastic particles during analysis. They found that Fenton's reagent was the most effective approach, successfully removing organic matter without damaging the plastic particles. The study provides important methodological guidance for standardizing microplastic research in challenging sample types.
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Researchers validated an oil-based extraction method for pulling microplastics out of sewage sludge and organic-rich soils, finding that pre-treating samples with Fenton's reagent (which destroys organic matter) improved recovery rates to nearly 100% for some plastic types. The study advances efforts to standardize microplastic measurement in complex environmental samples where current methods vary widely.
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This Croatian-language study compares ferrate(VI) and Fenton oxidation processes for removing microplastics from water, evaluating which treatment is more effective. Understanding the efficiency of chemical treatment methods is important for developing water purification systems that can eliminate plastic particles before they reach consumers.
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