Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 41, Pages 35099-35107Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b10921
Keywords
micromotors; self-propulsion; environmental monitoring; environmental remediation; bubble propulsion
Funding
- Chinese 1000-Talent Young Program
- Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education, Harbin Institute of Technology [2016KM007]
- Shenzhen Innovation Project [KQJSCX20170726104623185]
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There are two main aspects of environmental governance including monitoring and remediation, both of which are essential for environmental protection. Self-propelled micro/nanomotors (MNM) have shown promising potential for achieving on-demand tasks in environmental field, including environmental sensing and pollutant removal or degradation. However, most of the current MNM used in environmental protection can hardly accomplish the two major tasks of both monitoring and pollutant degradation. Hereby, we present a bubble-propelled mesoporous silica coated titania (TiO2@mSiO(2)) bilayer tubular micromotor with platinum (Pt) and magnetic Fe3O4 nanoparticles modified on their inner walls. The outer mesoporous silica (mSiO(2)) layer can effectively adsorb and collect the pollutants, and the adsorption capacity of the TiO2@mSiO(2) tube is about 3 times higher than that of the TiO2 tube due to the presence of mSiO(2) shell. By magnetic manipulation, the micromotors can be recovered to release the collected pollutant for precise analysis of the composition of the pollutants, such us pollutant molecule identification by surface-enhanced Raman scattering. The active motion and photocatalytic TiO2 inner layer of the micromotors can greatly enhance the degradation rate of the model pollutant rhodamine 6G (R6G). Our results show that within 30 min, up to 98% of R6G can be degraded by the motors. The successful demonstration of the TiO(2)pmSiO(2) bilayer tubular motors for simultaneous environmental monitoring and pollutant degradation paves the way for future development of active and intelligent micro/nanorobots for advanced environmental governance.
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