Journal
SMALL
Volume 11, Issue 4, Pages 499-506Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201402215
Keywords
activated carbon; micromotors; nanomotors; propulsion; remediation; decontamination; Janus particles
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Funding
- Defense Threat Reduction Agency-Joint Science and Technology Office for Chemical and Biological Defense [HDTRA1-13-1-0002]
- People Programme (Marie Curie Actions) of the EU [PIOF-GA-2012-326476]
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Self-propelled activated carbon-based Janus particle micromotors that display efficient locomotion in environmental matrices and offer effective on-the-fly' removal of wide range of organic and inorganic pollutants are described. The new bubble-propelled activated carbon Janus micromotors rely on the asymmetric deposition of a catalytic Pt patch on the surface of activated carbon microspheres. The rough surface of the activated carbon microsphere substrate results in a microporous Pt structure to provide a highly catalytic layer, which leads to an effective bubble evolution and propulsion at remarkable speeds of over 500 m/s. Such coupling of the high adsorption capacity of carbon nanoadsorbents with the rapid movement of these catalytic Janus micromotors, along with the corresponding fluid dynamics and mixing, results in a highly efficient moving adsorption platform and a greatly accelerated water purification. The adsorption kinetics and adsorption isotherms have been investigated. The remarkable decontamination efficiency of self-propelled activated carbon-based Janus micromotors is illustrated towards the rapid removal of heavy metals, nitroaromatic explosives, organophosphorous nerve agents and azo-dye compounds, indicating considerable promise for diverse environmental, defense, and public health applications.
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