We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Remediation of Micropalstic-heavy Metal Cocontaminated Soils Using Nanoscale Zero-valent Iron Supported on Palygorskite: Mechanisms and Effectiveness
Summary
Researchers developed a remediation approach for soils co-contaminated with microplastics and heavy metals using nanoscale zero-valent iron supported on palygorskite. The composite material effectively inhibited microplastic migration in soil and reduced heavy metal mobility, with the microplastic content in deeper soil layers remaining at only about 8% of initial levels after treatment.
This study investigates the remediation of microplastic-heavy metal co-contaminated soils using nanoscale zero-valent iron (nZVI) supported on palygorskite (PAL), referred to as PAL-nZVI.The composite material was successfully synthesized via a co-precipitation method and characterized using SEM, XRD, and FTIR.The results demonstrated that PAL-nZVI effectively inhibited the migration of microplastics in soil, with the microplastic content in the 10-15 cm layer remaining at only 8.42% of the initial amount after 28 days of treatment with 1% PAL-nZVI, compared to 15.59% in the control group.Additionally, PAL-nZVI significantly enhanced the stabilization of heavy metals, reducing the bioavailable fractions of cadmium (Cd) and lead (Pb).The weak acid-extractable fraction of Cd decreased by 11.55%, while the residual fraction increased by 11.46%.For Pb, the oxidizable fraction decreased by 22.34%, and the residual fraction increased by 27.35%.The potential ecological risk index (RI) for Cd and Pb decreased by 55.53% and 79.86%, respectively, with 2% PAL-nZVI treatment.The remediation mechanisms included physical adsorption, chemical reduction, surface complexation, and ion exchange.PAL-nZVI's high specific surface area and functional groups facilitated the adsorption of microplastics and heavy metals, while the reducibility of nZVI transformed high-valence heavy metal ions into low-valence states, reducing their toxicity.This study provides a promising approach for the remediation of soils co-contaminated with microplastics and heavy metals.However, further research is needed to optimize the process and evaluate long-term environmental impacts.
Sign in to start a discussion.
More Papers Like This
Sulfidated Nanoscale Zero-Valent Iron (S-nZVI) Facilitates Remediation and Safe Crop Production in Cr(VI) and Microplastics Co-contaminated Soil
Researchers tested sulfidated nanoscale zero-valent iron as a way to clean up agricultural soil contaminated with both chromium and microplastics. The treatment effectively reduced toxic chromium levels and helped trap microplastics, making it safer to grow crops in the contaminated soil. The study offers a promising approach for addressing the growing problem of combined heavy metal and microplastic contamination in farmland.
Heavy metal remediation by nano zero-valent iron in the presence of microplastics in groundwater: Inhibition and induced promotion on aging effects
Researchers found that microplastics in groundwater significantly influenced the performance of nano zero-valent iron used for heavy metal remediation, with some microplastic types inhibiting and others promoting the aging and reactivity of the nanomaterial depending on polymer type and concentration.
Distinctive adsorption and desorption behaviors of temporal and post-treatment heavy metals by iron nanoparticles in the presence of microplastics
Microplastics inhibited adsorption of most heavy metals by nano-zero-valent iron and facilitated their desorption during post-treatment, with the effect primarily affecting metals binding through surface complexation or electrostatic interaction rather than metals involved in redox reactions, providing insights for improved contaminated site remediation.
Carboxymethylcellulose-modified nano-zero-valent iron (C-nZVI) promotes ryegrass phytoremediation of cadmium in sediments co-contaminated with multiple microplastics: Mechanisms revealed by PLS-PM
A study found that applying carboxymethylcellulose-modified nano-zero-valent iron (C-nZVI) to soils co-contaminated with cadmium and six types of microplastics significantly boosted ryegrass growth and cadmium uptake while stabilising the metal in a less bioavailable form in the sediment. The results suggest C-nZVI could help rehabilitate agricultural soils facing the increasingly common problem of simultaneous microplastic and heavy-metal pollution.
How Do Micro‐ and Nanoplastics (MNPs) Affect Contaminant Removal by Nano Zero‐Valent Iron (nZVI) in Water and Soil?: A Review
This review examines how microplastics and nanoplastics interfere with nano zero-valent iron (nZVI), a widely used material for cleaning up contaminated groundwater and soil, finding that plastic particles typically reduce nZVI's effectiveness by clogging reactive sites and causing premature aging. The finding matters because it suggests that microplastic contamination at remediation sites could undermine cleanup efforts for other pollutants like heavy metals and organic compounds, requiring modified iron formulations (such as sulfidated nZVI) to maintain performance.