Dual Effect of Manganese Oxide Micromotors: Catalytic Degradation and Adsorptive Bubble Separation of Organic Pollutants

Wani, Owies M.; Safdar, Muhammad; Kinnunen, Niko M.; Jänis, Janne

doi:10.1002/chem.201504474

Cited by 79 publications

(92 citation statements)

References 29 publications

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“…Compared to the typical MnO 2 ‐based micromotors for pollutant degradation, our new PEDOT/MnO 2 tubular micromotors offer complete and rapid degradation of methylene blue (MB). Experimental results show that 200 mg L −1 PEDOT/MnO 2 micromotors synthesized by PS mode can decolorize 30 mg L −1 MB in 10 min, several time faster than previous studies did …”

Section: Introductionmentioning

confidence: 66%

“…As an ideal catalyst for hydrogen peroxide, MnO 2 , is synthesized inside the microtubes supported by a deposited PEDOT outer layer. It was reported catalytic degradation and adsorptive bubble separation occur synchronously during the decontamination of methylene blue . At the same way, micromotors decompose hydrogen peroxide and continuously produce oxygen bubbles for propulsion, accompanied by generation of radicals to react with organic molecules for their subsequent degradation .…”

Section: Resultsmentioning

confidence: 99%

“…Commercial MnO 2 microparticles, driven by the bubbles from catalytic decomposition of hydrogen peroxide, showed fast motion with speed of ≈120 µm s −1 at 21% H 2 O 2 . Later on, commercial MnO 2 was utilized as micromotors to remove the organic pollutants . The catalytic degradation combined with adsorptive bubble separation resulted in remarkable decolorization of dye‐contaminated waters and over 90% of azo‐dyes was decolorized in 1 h. Moreover, Feng and co‐workers synthesized MnO 2 /graphene micromotors with “sandwich‐like structure” via a one‐step hydrothermal method and poly(3,4‐ethylenedioxythiophene) (PEDOT)/MnO 2 tubular microrockets by potentiostatic deposition, both of which could move rapidly in biological media .…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Deposition Tailors the Catalytic Performance of MnO₂‐Based Micromotors

Liu

et al. 2018

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Artificial micro/nanomotors that could perform diverse tasks autonomously at the micro/nanoscale have been emerging as promising tools in many practical applications. Electrochemical synthesis is one of the dominating methods to fabricate these micro/nanodevices with diverse geometries and material components. By changing the conditions of electrochemical deposition, the surface morphology, crystal structure, and hence the resultant performance of deposited material could be tailored. In the current work, a feasible fabrication strategy is presented in terms of three unique electrodeposition types (i.e., potentiodynamic, potentiostatic (PS), and galvanostatic) to synthesize different MnO2‐based micromotors. Distinct propulsion behavior as well as the catalytic degradation of azo‐dye organic waste (with methylene blue as the representative), between three kinds of MnO2‐based micromotors is clearly displayed, owing to the distinctive chemical composition and morphology designs. The activated R‐MnO2‐based micromotors in PS mode exhibit fast motion speed (up to 12 body length per second), leading to the highest degradation efficiency. Such propulsion performance is comparable with the microrockets made by noble metals such as Pt and Ag. The new protocol will have a profound impact on the design of synthetic micro/nanomotors and hold a considerable promise for their diverse applications.

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Section: Introductionmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical Deposition Tailors the Catalytic Performance of MnO₂‐Based Micromotors

Liu

et al. 2018

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“…[45][46][47] As a kind of inorganic nanomaterials, MnO 2 have drawn much attention because of their flexible structures and unique properties and have been applied to catalysis, ion exchange, supercapacitors, molecule adsorption, biosensors and so on. 48 One of the recent applications has fo- [49][50][51][52] And micromotors containing manganese oxide and noble metal or graphene have also been studied. [53][54][55] In this work, by consideration of its special microstructure, abundant component of protein, we choose ESM as the biotemplate to help synthesize MnO 2 .…”

Section: Introductionmentioning

confidence: 99%

MnO2 Submicroparticles from Chinese Brush and Their Application in Treatment of Methylene Blue Contaminated Wastewater

Wang

et al. 2017

ACSi

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Eggshell membrane (ESM) is selected as biotemplate to prepare MnO 2 submicroparticles (SMPs) using Chinese Brush with sodium hydroxide solution. The size with average 710 nm of the obtained materials is in good consistency with the microsructured biotemplate. An efficient and convenient absorbent for methylene blue (MB) is developed. The removal efficiency could reach up to 93% in 35 min under room temperature without pH adjusting owing to the excellent adsorption from ESM itself and hydroxyl group formed on the surface of MnO 2 crystal in the aqueous solution. Materials on the membrane can be separated from the wastewater simply to avoid the secondary pollution caused by the leak of material. This interesting approach to MnO 2 SMPs and facile operation for MB adsorption could open a new path to the submicro-materials based wastewater treatment.

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“…Nonetheless, environmental applications of motors have shown promising results [24,25] . Recent advances in this area demonstrated degradation of organics [26][27][28][29] and chemical warfare agent [30][31][32] , sensing of heavy metal [33] , separation of organic materials [34] and oil removal [35] capabilities of nano/micromotors.…”

Section: Introductionmentioning

confidence: 99%

Reusable and Long‐Lasting Active Microcleaners for Heterogeneous Water Remediation

Parmar

Vilela

Pellicer

et al. 2016

Adv Funct Materials

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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).

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Dual Effect of Manganese Oxide Micromotors: Catalytic Degradation and Adsorptive Bubble Separation of Organic Pollutants

Cited by 79 publications

References 29 publications

Electrochemical Deposition Tailors the Catalytic Performance of MnO₂‐Based Micromotors

Electrochemical Deposition Tailors the Catalytic Performance of MnO₂‐Based Micromotors

MnO2 Submicroparticles from Chinese Brush and Their Application in Treatment of Methylene Blue Contaminated Wastewater

Reusable and Long‐Lasting Active Microcleaners for Heterogeneous Water Remediation

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Dual Effect of Manganese Oxide Micromotors: Catalytic Degradation and Adsorptive Bubble Separation of Organic Pollutants

Cited by 79 publications

References 29 publications

Electrochemical Deposition Tailors the Catalytic Performance of MnO2‐Based Micromotors

Electrochemical Deposition Tailors the Catalytic Performance of MnO2‐Based Micromotors

MnO2 Submicroparticles from Chinese Brush and Their Application in Treatment of Methylene Blue Contaminated Wastewater

Reusable and Long‐Lasting Active Microcleaners for Heterogeneous Water Remediation

Contact Info

Product

Resources

About

Electrochemical Deposition Tailors the Catalytic Performance of MnO₂‐Based Micromotors

Electrochemical Deposition Tailors the Catalytic Performance of MnO₂‐Based Micromotors