Nitroaromatic explosives such as 2,4,6-trinitrotoluene (2,4,6-TNT) and 2,4-dinitrotoluene (2,4-DNT) are two common nitroaromatic compounds in ammunition. Their leakage leads to serious environmental pollution and threatens human health. It is important to remove or decompose them rapidly and efficiently. In this work, we present that light-powered TiO2/Pt Janus micromotors have high efficiency for the "on-the-fly" photocatalytic degradation of 2,4-DNT and 2,4,6-TNT in pure water under UV irradiation. The redox reactions, induced by photogenerated holes and electrons on the TiO2/Pt Janus micromotor surfaces, produce a local electric field that propels the micromotors as well as oxidative species that are able to photodegrade 2,4-DNT and 2,4,6-TNT. Furthermore, the moving TiO2/Pt Janus micromotors show an efficient degradation of nitroaromatic compounds as compared to the stationary ones thanks to the enhanced mixing and mass transfer in the solution by movement of these micromotors. Such fuel-free light-powered micromotors for explosive degradation are expected to find a way to environmental remediation and security applications.
Bibliographical noteFunding Information:
This work was supported by the project Advanced Functional Nanorobots (reg. CZ.02.1.01/0.0/0.0/15_003/0000444 financed by the EFRR). The authors acknowledge A*Star Grant SERC A1783c0005 (Singapore). L.K. acknowledges the Scholarship Fund from China Scholarship Council (CSC 201606950043).
This work was supported by the project Advanced Functional Nanorobots (reg. CZ.02.1.01/0.0/0.0/15-003/0000444 financed by the EFRR). The authors acknowledge A∗Star Grant SERC A1783c0005 (Singapore). L.K. acknowledges the Scholarship Fund from China Scholarship Council (CSC 201606950043).
© 2018 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Materials Science(all)