Bubble-propelled micromotors based on hierarchical MnO<sub>2</sub> wrapped carbon nanotube aggregates for dynamic removal of pollutants

Wu, Xiukai; Ling, Chen; Zheng, Chan; Yan, Xinxin; Dai, Pingqiang; Wang, Qianting; Li, Wei; Chen, Wenzhe

doi:10.1039/d0ra00626b

Cited by 13 publications

(13 citation statements)

References 48 publications

(60 reference statements)

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“…[25] The system coupled adsorption (carbon) with catalytic degradation (MnO 2 ) and afforded a promising strategy in environmental remediation. [88] The prepared Mn-micro/ nanomotors manifested high efficiencies for the removal of organic pollutants (methylene blue, acid fuchsin, and methyl orange) via an adsorption-oxidation-desorption regime, with an average velocity of 7.73 ± 0.82 mm s −1 at 9 wt% H 2 O 2 . [62] Similar to Mn-based materials, modified heterogeneous Fenton catalysts have been applied for organic contaminant removal.…”

Section: Application In Organic Pollutant Degradationmentioning

confidence: 96%

“…Due to a large specific surface area, carbonaceous materials have been widely applied in purification of organic pollutants by adsorption and catalytic oxidation (Figure 7b). [88,90] Carbon/MnO 2 tubular micro/nanomotors were then fabricated by carbon allotropes using 0D to 3D porous template-assisted chemical deposition. [25] The system coupled adsorption (carbon) with catalytic degradation (MnO 2 ) and afforded a promising strategy in environmental remediation.…”

Section: Application In Organic Pollutant Degradationmentioning

confidence: 99%

“…Reproduced with permission. [88] Copyright 2020, The Royal Society of Chemistry. c) Methylene blue degradation by poly(3,4-ethylenedioxythiophene)/Fe-MnO 2 (PEDOT/Fe-MnO 2 ) microtubes with a fish-scale-like structure.…”

Section: Other Environmental Applicationsmentioning

confidence: 99%

mentioning

confidence: 99%

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Manganese‐Based Micro/Nanomotors: Synthesis, Motion, and Applications

Yang

Zhang

et al. 2021

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As emerging micro/nano‐scale devices, micro/nanomotors have been innovatively applied in the environmental and biomedical applications. In this paper, the recent advances of Mn‐based micro/nanomotors (Mn‐micro/nanomotors) in catalytic oxidation of organic contaminants and the mechanisms in decomposition of H2O2 (e.g., the generation of O2 bubbles and reactive oxygen species) are reviewed. The intrinsic characteristics and synthetic strategies of Mn‐based materials are discussed, aiming to gain comprehensive understandings on the asymmetric design of micro/nanomotors. Mn‐micro/nanomotors have many advantages such as flexible structures, biocompatibility, powerful motion, long lifetime, and low‐cost as compared to noble‐metal micro/nanomotors. These merits fulfil Mn‐micro/nanomotors great promises from proof‐of‐concept studies to realistic applications, including pollutant decomposition, trace detection of heavy metal ions, oil removal, drug delivery, isolation of biological targets, and killing bacteria and cancer cells. The great flexibility in fabrication enables diverse and innovative strategies to address challenges for Mn‐micro/nanomotors, including high consumption of H2O2 and non‐directional motion. Meanwhile, a perspective of Mn‐micro/nanomotors in water remediation by coupling the motors with other Fenton/Fenton‐like systems to enhance the catalytic activity and to yield more reactive oxygen species is presented. Directions to the design of on‐demand H2O2‐fueled Mn‐micro/nanomotors for advanced purification of organic contaminants in aquatic systems are also proposed.

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Section: Application In Organic Pollutant Degradationmentioning

confidence: 96%

Section: Application In Organic Pollutant Degradationmentioning

confidence: 99%

Section: Other Environmental Applicationsmentioning

confidence: 99%

mentioning

confidence: 99%

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Manganese‐Based Micro/Nanomotors: Synthesis, Motion, and Applications

Yang

Zhang

et al. 2021

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“…There are many types of electrode materials used as supercapacitors. Among them, transition metal oxides are used as anode materials, which have higher capacitance and better electrochemical stability than carbon materials, such as MnO2 [5,6], RuO2 [7,8], CeO2 [9], etc.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of G/CNT on the Enhanced Capacitance of IrO2-ZnO-G(CNT)/Ti Electrodes

Shao

et al. 2021

Preprint

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Compounding different materials to be the electrode is a good way in the field of supercapacitors. IrO2 was used as an active and conductor oxide, and ZnO was used as a semiconductor oxide. Carbon nanotube (CNT) and Graphene (G) were used to prepare the electrodes of IrO2-ZnO-carbon nanotube (CNT)/Ti and IrO2-ZnO-graphene oxide (G)/Ti by thermal decomposition method and their different effect on the properties was studied in detail. The surface of IrO2-ZnO-CNT/Ti had a "hill-bag" structure, and the IrO2-ZnO-G/Ti had a graphene sheet layered fold structure, their specific surface area and pore volume were significantly greater than that of an electrode without carbon material. The specific capacitances of IrO2-ZnO-G/Ti and IrO2-ZnO-CNT/Ti were 681 F g-1 and 501F g-1, respectively, which were higher than IrO2-ZnO/Ti (399 F g-1). The capacitance retention rate of the IrO2-ZnO-G/Ti electrode coating was 80.24% after 20,000 cyclic tests, which was worse than that of IrO2-ZnO/Ti (90.65%). The addition of carbon materials reduced the cycle stability, but the binding effect of graphene and the coating was better than that of carbon nanotubes. Graphene improved the overall performance better than that of carbon nanotubes. A binder-free asymmetric supercapacitor working in H2SO4 solution was assembled with RuO2-MoO3/Ti and IrO2-ZnO-G/Ti as cathodic and anodic electrode respectively. It exhibited the energy densities of 29.6 W h kg-1 and 25.3 W h kg-1 when the power density was 700 W kg-1 and 3505 W kg-1 respectively. The preliminary charge/discharge mechanism of the asymmetric supercapacitor in the H2SO4 solution was presented.

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Nanomotor‐Derived Porous Biomedical Particles from Droplet Microfluidics

et al. 2021

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Porous particles have found widespread applications in therapeutic diagnosis, drug delivery, and tissue engineering due to their typical properties of large surface area, extensive loading capacity, and hierarchical microstructures. Attempts in this aspect are focusing on the development of effective methods to generate functional porous particles. Herein, a simple droplet microfluidics for continuously and directly generating porous particles by introducing bubble-propelled nanomotors into the system is presented. As the nanomotors can continuously generate gas bubbles in the unsolidified droplet templates, the desirable porous microparticles can be obtained after droplet polymerization. It is demonstrated that the generation process is highly controlled and the resultant microparticles show excellent porosity and monodispersity. In addition, the obtained porous microparticles can serve as microcarriers for 3D cell culture, because of their characteristic porous structures and favorable biocompatibility. Moreover, owing to the existence of oxygen in these microparticles, they can be used to improve the healing effects of wounds in the type I diabetes rat models. These remarkable features of the generation strategy and the porous microparticles point to their potential values in various biomedical fields.

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Bubble-propelled micromotors based on hierarchical MnO₂ wrapped carbon nanotube aggregates for dynamic removal of pollutants

Abstract: Water pollution is currently an urgent public health and environmental issue.

Cited by 13 publications

References 48 publications

Manganese‐Based Micro/Nanomotors: Synthesis, Motion, and Applications

Manganese‐Based Micro/Nanomotors: Synthesis, Motion, and Applications

Study on the Effect of G/CNT on the Enhanced Capacitance of IrO2-ZnO-G(CNT)/Ti Electrodes

Nanomotor‐Derived Porous Biomedical Particles from Droplet Microfluidics

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Bubble-propelled micromotors based on hierarchical MnO2 wrapped carbon nanotube aggregates for dynamic removal of pollutants

Abstract: Water pollution is currently an urgent public health and environmental issue.

Cited by 13 publications

References 48 publications

Manganese‐Based Micro/Nanomotors: Synthesis, Motion, and Applications

Manganese‐Based Micro/Nanomotors: Synthesis, Motion, and Applications

Study on the Effect of G/CNT on the Enhanced Capacitance of IrO2-ZnO-G(CNT)/Ti Electrodes

Nanomotor‐Derived Porous Biomedical Particles from Droplet Microfluidics

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Bubble-propelled micromotors based on hierarchical MnO₂ wrapped carbon nanotube aggregates for dynamic removal of pollutants