Can a Magnetic Material Remove Microplastics From Water? What the New Study Found

A new magnetic adsorbent removed more than 95% of known model micro- and nanoplastics under selected laboratory conditions. It also performed well in two industrial laundry liquids. The result is a promising step toward better wastewater treatment, not a home filter or a proven solution for all PFAS.

Quick answer

Researchers at RMIT University developed a powder that binds plastic particles and can then be pulled from water with a magnetic separator. In laboratory tests, it removed more than 95% of model plastic particles across a reported size range of 30 nanometers to 8 micrometers within one hour. It also removed more than 88% of polyester fibres and dyes from two denim-laundry liquids.

Those results are worth following, especially because nanoplastics can be difficult to capture and loose treatment powders can be difficult to recover. But the experiments used concentrated model particles and relatively large amounts of adsorbent. The technology has not been validated as a household drinking-water filter or operated at full treatment-plant scale.

Three things to know

• The 95% result is real within the experiment. It came from controlled tests using known plastic standards, not ordinary tap water at typical particle concentrations.
• Magnetic recovery is an important feature. A 4-liter prototype showed that a commercial magnetic separator could collect the treatment powder after it bound particles.
• The PFAS finding was much narrower. Researchers tested one long-chain compound, PFDA, and reported more than 85% removal. They did not demonstrate broad PFAS removal or destruction.

How the main claims hold up

Claim 1: Did the material remove more than 95% of microplastics and nanoplastics within an hour?

PFK verdict: yes, under the reported high-concentration laboratory conditions.

The material combines a porous metal-organic framework with a magnetic carbon and iron-oxide base. Its surface binds particles, while the magnetic component allows the loaded powder to be separated from the water.

A typical experiment mixed 15 milligrams of adsorbent with 5 milliliters of water containing 1,000 milligrams per liter of polystyrene for 60 minutes. That equals a 3-to-1 adsorbent-to-plastic mass ratio. The researchers varied particle size, concentration, pH, surface charge, and fresh versus saline water. They also tested known standards made from polyethylene, polypropylene, polyester, PVC, PVDF, and other polymers.

The reported removal exceeded 95% across the study's particle range, with much of the reduction occurring in the first 15 minutes. That demonstrates rapid capture of model particles. It does not show the same percentage in every source water, at trace concentrations, or after years of continuous operation.

Claim 2: Did it work in real industrial wastewater?

PFK verdict: the laundry results are promising but limited.

The team tested two liquids from denim-manufacturing washes that contained polyester fibres, dyes, and surfactant. Using 6 grams of adsorbent per liter for two hours, the material reportedly removed more than 88% of polyester fibres and dyes.

This is stronger evidence than a pure-water test because detergents, organic matter, dyes, and mixed particles can interfere with adsorption. However, two liquids from one manufacturer cannot establish performance across textile plants, seasons, treatment systems, or wastewater compositions. The experiment was still a batch test, not a long-running treatment-plant trial.

Claim 3: Can the material be recovered and reused?

PFK verdict: yes for five laboratory cycles, with substantial processing between uses.

In a 4-liter prototype, the researchers treated saline water containing model polystyrene, then circulated it three times through a commercial magnetic separator. This demonstrated that the powder could be collected without relying only on fine filtration.

For the reuse experiment, the team magnetically recovered the material after each cycle, washed it repeatedly with water and ethanol, vacuum-dried it, and used it again. Polystyrene removal remained above 90% over five cycles.

That is useful early durability evidence, but “reusable” does not mean waste-free or ready for unattended operation. Solvent use, drying energy, adsorbent losses, pollutant disposal, and performance over many more cycles still need evaluation.

The “room-temperature synthesis” description also needs context. The final metal-organic-framework coating grew at room temperature, but preparation of the magnetic carbon-iron base included heating to 700°C for three hours under nitrogen.

Claim 4: Did the material remove PFAS too?

PFK verdict: it showed preliminary adsorption of PFDA, not a general PFAS solution.

The researchers tested perfluorodecanoic acid, or PFDA, at 500 micrograms per liter. They used 6 grams of adsorbent per liter and reported more than 85% removal.

PFDA is one relatively long-chain member of a very large chemical family. The experiment did not test PFOA, PFOS, GenX, or difficult short-chain PFAS. It also captured PFDA rather than destroying it, leaving the question of regeneration and safe disposal of the loaded material.

“Early promise against one PFAS” is therefore fair. “Removes PFAS from drinking water” would go beyond the evidence.

Claim 5: Is this a filter families can buy now?

PFK verdict: no. This is an experimental treatment material aimed primarily at wastewater infrastructure.

RMIT is working with commercial partners on magnetic separation, stormwater, textile wastewater, and possible municipal applications. Publicly available evidence does not yet establish a finished consumer cartridge, drinking-water certification, safe residual levels, maintenance schedule, or household cost.

For consumers concerned about drinking water today, the practical starting point remains the local water-quality report or a private-well test, followed by a treatment system certified for the specific contaminants of concern. This study is not a reason to replace a working household filter or buy a product making unsupported magnetic-purification claims.

PFK assessment: The new material is a credible and interesting wastewater-treatment advance. Its strongest contribution is combining rapid small-particle capture with magnetic recovery. It still needs trace-level, continuous-flow, safety, regeneration, and full-scale testing before it can support household or broad PFAS claims.

How PFK evaluated these claims

PFK separated five questions that headlines can blur together: what was removed, at what starting concentration, with how much treatment material, how the loaded material was recovered, and whether capture was demonstrated in realistic water over repeated use.

Across the claims, the paper supports model-particle removal and early wastewater engineering. It does not establish a consumer product, finished-water safety, broad PFAS performance, pollutant destruction, or reduced human exposure.

Research reviewed July 23, 2026. This article is for educational purposes and does not replace guidance from a water utility, certified laboratory, or qualified water-treatment professional.

Sources

1. Haris M, et al. “Scalable room-temperature synthesis of a MOF-based magnetic adsorbent for rapid simultaneous removal of PFAS and micro-nanoplastics.” Chemical Engineering Journal. 2026;542:178141. DOI: 10.1016/j.cej.2026.178141.
2. Haris M, et al. Supplementary information for the primary paper. Download from Elsevier.
3. RMIT University. “Magnetic invention removes ‘invisible’ microplastics plus some PFAS.” July 23, 2026. Read the university report.
4. TOI Science Desk. “Scientists built a reusable magnetic material that removed more than 95% of microplastics and nanoplastics from water within one hour and showed early promise in removing some PFAS.” Times of India. July 24, 2026. Read the article.