During research, Czech scientists built microscopic cleanup robots from 2 materials and tested them against plastic pollution. Now, the moving swarms remove about 94% of polystyrene and 89% of PET from contaminated water

Microplastic pollution has become a growing environmental concern because tiny plastic particles can spread through water and soil and eventually enter the food chain. Their small size can also make them difficult to collect, particularly when they become trapped within soil.

Researchers are exploring new ways to tackle this problem, including the use of microscopic robots that can move through contaminated environments. In a recent study, Czech scientists tested magnetically controlled microrobots designed to capture microplastics from both water and soil.

Robots combine MXene particles and magnetic nickel

The developers made the microscopic robots using layered MXene particles, which attract and trap plastic.


They also added magnetic nickel nanoparticles to the material. These nanoparticles allowed the robots to respond to rotating magnetic fields, giving researchers a way to propel and control their movement.

Magnetic fields guide the robot swarms

In laboratory tests, the team submerged swarms of the microscopic robots in water and soil samples contaminated with plastic.

Externally powered magnetic fields caused the robots to spin through the liquid. In soil, the same magnetic control allowed the robots to move through tiny water-filled gaps.

This movement helped the robots reach microplastics that had become trapped within the soil.

"In soil environments, the microrobots can navigate through water-permeated soil microenvironments, actively disrupt microplastic entrapment within soil matrices, and extract them," the team noted in its research paper.

Up to 94% of polystyrene removed from water

The magnetized microscopic robots achieved their highest reported removal rates in water.

Within one hour, they removed up to 94% of polystyrene microplastics and 89% of polyethylene terephthalate (PET) microplastics from contaminated water.

The robots also removed plastic from soil. In those samples, they removed up to 81% of polystyrene and 72% of PET.

Active motion outperformed passive adsorption

The researchers found that the robots' active magnetic movement performed better than passive MXene adsorption.

However, the results were obtained during laboratory testing. Real-world trials are still needed to establish how effective the technology would be under actual environmental conditions.

The researchers also identified potential concerns that will need to be assessed, including metal-ion leaching and incomplete robot retrieval.



Source: Electronics360

FAQs:

Q1. What are microplastics?

Microplastics are very small plastic particles found in the environment. They can be difficult to remove because of their tiny size.

Q2. Why are microplastics an environmental concern?

Microplastics can affect soil and ecosystems and can enter the food chain. Their small size also makes environmental cleanup more challenging.