Core–shell microspheres for the ultrafast degradation of estrogen hormone at neutral pH

Villa, Katherine; Parmar, Jemish; Vilela, Diana; Sánchez, Samuel

doi:10.1039/c7ra11705a

Cited by 16 publications

(9 citation statements)

References 52 publications

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“…Figure S4a displays the full survey spectrum of MnOx−A−U, showing peaks for O1s, C1s and Mn2p. The spectrum of O1s showed a major peak at 529.5 eV along with a shoulder peak at 531.0 eV which can be attributed to the lattice oxygen and metal‐hydroxyl species, respectively (Figure S4b) . C1 s spectrum exhibited a major peak at 284.6 eV, confirming the presence of carbonate species (288.8 eV) in MnOx−A−U .…”

Section: Resultsmentioning

confidence: 81%

Heterostructured manganese catalysts for the selective oxidation of 5‐hydroxymethylfurfural to 2,5‐diformylfuran

Pal

Saravanamurugan

2020

ChemCatChem

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A series of manganese oxide catalysts were synthesised in the presence of various precipitants using hydrothermal approach. The manganese oxide synthesised (MnOxÀ AÀ U) using manganese acetate tetrahydrate and urea as precursor and precipitant, respectively, was found to be composed of heterostructures of manganese, that is, MnCO 3 , ɛ-MnO 2 and Mn 2 O 3 , and their presence were confirmed by XRD, FTIR and XPS analyses. The catalytic activity of MnOxÀ AÀ U towards selective oxidation of HMF to DFF in ethanol afforded 92.0 % conversion along with 88.0 % DFF yield at 120°C, 30 bar O 2 , after 4 h of reaction time.Performing HMF oxidation under N 2 atmosphere with MnOxÀ AÀ U yielded only 15.0 % DFF, revealing that lattice oxygen played a crucial role in the oxidation process, which was confirmed by subjecting the spent catalyst to XPS analysis. Based on the results obtained from XPS analysis, it was speculated that ɛ-MnO 2 and MnCO 3 could be the active species which could selectively catalyse the reaction. The MnOxÀ AÀ U catalyst was able to recycle for at least three runs with a small loss of activity due to ɛ-MnO 2 content decreased.[a] P. Pal, Dr.

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Section: Resultsmentioning

confidence: 81%

Heterostructured manganese catalysts for the selective oxidation of 5‐hydroxymethylfurfural to 2,5‐diformylfuran

Pal

Saravanamurugan

2020

ChemCatChem

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“…[59][60][61] Given the high oxidation potential of these radicals, 62 they can perform the total degradation of the organic matter (pollutants) to non-harmful molecules (CO2 and water). At the same time, MnO2 can also produce additional HO • radicals through the Fenton-like reaction in the presence of H2O2, 57,[63][64][65][66] resulting in an enhancement of the total oxidation of the organic pollutants.…”

Section: Resultsmentioning

confidence: 99%

Metal-Oxide-Based Microjets for the Simultaneous Removal of Organic Pollutants and Heavy Metals

Villa

Parmar

Vilela

et al. 2018

ACS Appl. Mater. Interfaces

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113

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Water contamination from industrial and anthropogenic activities is nowadays a major issue in many countries worldwide. To address this problem, efficient water treatment technologies are required. Recent efforts have focused on the development of self-propelled micromotors that provide enhanced micromixing and mass transfer by the transportation of reactive species, resulting in higher decontamination rates. However, a real application of these micromotors is still limited due to the high cost associated to their fabrication process. Here, we present FeO-decorated SiO/MnO microjets for the simultaneous removal of industrial organic pollutants and heavy metals present in wastewater. These microjets were synthesized by low-cost and scalable methods. They exhibit an average speed of 485 ± 32 μm s (∼28 body length per s) at 7% HO, which is the highest reported for MnO-based tubular micromotors. Furthermore, the photocatalytic and adsorbent properties of the microjets enable the efficient degradation of organic pollutants, such as tetracycline and rhodamine B under visible light irradiation, as well as the removal of heavy metal ions, such as Cd and Pb.

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“…Surfactants ease the release of the bubble to facilitate their propulsion. Bubble-propelled micromotors are reported to swim either very slowly or not at all without surfactants. − Considering that these surfactants add extra organic load in the water and they can also compete with the pollutants during the degradation reaction, it may limit the overall efficiency of the performance of micromotors. Therefore, it is vital to ensure that micromotors do not leave any harmful reactants, byproducts, and other kinds of pollutants once their task is completed.…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

Micro- and Nanomotors as Active Environmental Microcleaners and Sensors

et al. 2018

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The quest to provide clean water to the entire population has led to a tremendous boost in the development of environmental nanotechnology. Toward this end, micro/nanomotors are emerging as attractive tools to improve the removal of various pollutants. The micro/nanomotors either are designed with functional materials in their structure or are modified to target pollutants. The active motion of these motors improves the mixing and mass transfer, greatly enhancing the rate of various remediation processes. Their motion can also be used as an indicator of the presence of a pollutant for sensing purposes. In this Perspective, we discuss different chemical aspects of micromotors mediated environmental cleanup and sensing strategies along with their scalability, reuse, and cost associated challenges.

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Core–shell microspheres for the ultrafast degradation of estrogen hormone at neutral pH

Abstract: Ultrafast photo-Fenton degradation of 17α-ethynylestradiol under simulated solar irradiation.

Cited by 16 publications

References 52 publications

Heterostructured manganese catalysts for the selective oxidation of 5‐hydroxymethylfurfural to 2,5‐diformylfuran

Heterostructured manganese catalysts for the selective oxidation of 5‐hydroxymethylfurfural to 2,5‐diformylfuran

Metal-Oxide-Based Microjets for the Simultaneous Removal of Organic Pollutants and Heavy Metals

Micro- and Nanomotors as Active Environmental Microcleaners and Sensors

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