Reusable and Long‐Lasting Active Microcleaners for Heterogeneous Water Remediation. (14th April 2016)

• Record Type: Journal Article
• Authors: Parmar, Jemish; Vilela, Diana; Pellicer, Eva; Esqué‐de los Ojos, Daniel; Sort, Jordi; Sánchez, Samuel
• Is Part Of: Advanced functional materials. Volume 26:Number 23(2016)
• Page Start: 4152
• Page End: 4161
• Publication Date: 2016-04-14
• Subjects: catalysts -- heterogeneous catalysis -- microcleaners -- micromotors -- nanorobots -- wastewater treatment; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201600381
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract : Self‐powered micromachines are promising tools for future environmental remediation technology. Waste‐water treatment and water reuse is an essential part of environmental sustainability. Herein, we present reusable Fe/Pt multi‐functional active microcleaners that are capable of degrading organic pollutants (malachite green and 4‐nitrophenol) by generated hydroxyl radicals via a Fenton‐like reaction. Various different properties of microcleaners, such as the effect of their size, short‐term storage, long‐term storage, reusability, continuous swimming capability, surface composition, and mechanical properties, are studied. It is found that these microcleaners can continuously swim for more than 24 hours and can be stored more than 5 weeks during multiple cleaning cycles. The produced microcleaners can also be reused, which reduces the cost of the process. During the reuse cycles the outer iron surface of the Fe/Pt microcleaners generates the in‐situ, heterogeneous Fenton catalyst and releases a low concentration of iron into the treated water, while the mechanical properties also appear to be improved due to both its surface composition and structural changes. The microcleaners are characterized by scanning electron microscopy (SEM), X‐ray photoelectron spectroscopy (XPS), nanoindentation, and finite‐element modeling (FEM). Abstract : Reusable Fe/Pt multi‐functional active microcleaners are capable of degrading organic pollutants (malachite green and 4‐nitrophenol) by generated hydroxyl radicals via an in situ heterogeneous Fenton‐like reaction. The microcleaners can continuously swim for more than 24 hours and can be stored for more than 5 weeks and subjected to multiple cleaning cycles for reuse, which reduces the cost of the process.