Fuel-Free Light-Powered TiO2/Pt Janus Micromotors for Enhanced Nitroaromatic Explosives Degradation

Lei Kong; Carmen C. Mayorga-Martinez; Jianguo Guan; Martin Pumera

doi:10.1021/acsami.8b05776

Fuel-Free Light-Powered TiO₂/Pt Janus Micromotors for Enhanced Nitroaromatic Explosives Degradation

Lei Kong, Carmen C. Mayorga-Martinez, Jianguo Guan, Martin Pumera

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

64 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	22427-22434
Number of pages	8
Journal	ACS Applied Materials and Interfaces
Volume	10
Issue number	26
DOIs	https://doi.org/10.1021/acsami.8b05776
Publication status	Published - 2018 Jul 5

Bibliographical note

Funding 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).

Funding 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).

Publisher Copyright:
© 2018 American Chemical Society.

All Science Journal Classification (ASJC) codes

Materials Science(all)

Access to Document

10.1021/acsami.8b05776

Cite this

@article{d99e9d96d30845f88177be7b5c9b2400,

title = "Fuel-Free Light-Powered TiO2/Pt Janus Micromotors for Enhanced Nitroaromatic Explosives Degradation",

abstract = "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.",

author = "Lei Kong and Mayorga-Martinez, {Carmen C.} and Jianguo Guan and Martin Pumera",

note = "Funding 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). Funding 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). Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

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AU - Guan, Jianguo

AU - Pumera, Martin

N1 - Funding 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). Funding 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). Publisher Copyright: © 2018 American Chemical Society.

PY - 2018/7/5

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N2 - 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.

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