Magnetically Driven Living Microrobot Swarms for Aquatic Micro- and Nanoplastic Cleanup

Area of Science:

• Environmental Science
• Biotechnology
• Materials Science

Background:

• Micro- and nanoplastic pollution is a global environmental crisis, contaminating water, food, and accumulating in living organisms.
• Current methods for micro- and nanoplastic removal are insufficient to address the pervasive nature of this pollution.

Purpose of the Study:

• To develop a novel, environmentally friendly method for capturing and removing aquatic micro- and nanoplastics.
• To engineer magnetically driven living bacterial microrobots capable of autonomous and guided swarm motion for plastic remediation.

Main Methods:

• Development of magnetotactic bacteria-based living microrobots (MTB biobots).
• Utilizing a rotating magnetic field to induce a 3D swarming motion, mimicking fish schooling.
• Employing magnetically guided navigation for dynamic capture and retrieval of micro- and nanoplastics.
• Assessing removal efficiencies using both model and real-world microplastic samples.

Main Results:

• The 3D magnetic swarming motion of MTB biobots significantly enhanced the capture and removal of micro- and nanoplastics.
• The microrobots demonstrated effective collection of plastics from various commercial products.
• Magnetic separation enabled efficient retrieval of the captured micro- and nanoplastics from contaminated water.

Conclusions:

• Magnetically driven bacterial microrobots offer a promising, nature-inspired solution for micro- and nanoplastic pollution.
• Swarm manipulation of these biobots provides an effective and environmentally friendly approach to water treatment.
• This biomachinery-based technology presents a viable strategy to mitigate the global microplastic pollution crisis.