Radially Oriented ZnO Nanowires on Flexible Poly‐<scp>l</scp>‐Lactide Nanofibers for Continuous‐Flow Photocatalytic Water Purification

Sugunan, Abhilash; Guduru, V. K.; Uheida, Abdusalam; Toprak, Muhammet S.; Muhammed, Mamoun

doi:10.1111/j.1551-2916.2010.03986.x

Cited by 59 publications

(43 citation statements)

References 28 publications

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“…It is clear from their perspective that electrospun nanofibers and other hybrid nano-membranes are very effective for the efficient removal of organic dyes, heavy metals, and foulants. In a recent study, radially oriented ZnO nanowires were decorated on flexible poly-l-lactide nanofibers for continuous-flow photocatalytic water purification [12]. The photocatalytic decomposition was monitored on various organic pollutant dyes, such as methylene blue, monocrotophos, and diphenylamine under illumination with UV light using this highly flexible hierarchical nanostructure.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in the Synthesis of Metal Oxide Nanofibers and Their Environmental Remediation Applications

Mondal

2017

Inventions

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Recently, wastewater treatment by photocatalytic oxidation processes with metal oxide nanomaterials and nanocomposites such as zinc oxide, titanium dioxide, zirconium dioxide, etc. using ultraviolet (UV) and visible light or even solar energy has added massive research importance. This waste removal technique using nanostructured photocatalysts is well known because of its effectiveness in disintegrating and mineralizing the unsafe organic pollutants such as organic pesticides, organohalogens, PAHs (Polycyclic Aromatic Hydrocarbons), surfactants, microorganisms, and other coloring agents in addition to the prospect of utilizing the solar and UV spectrum. The photocatalysts degrade the pollutants using light energy, which creates energetic electron in the metal oxide and thus generates hydroxyl radical, an oxidative mediator that can oxidize completely the organic pollutant in the wastewater. Altering the morphologies of metal oxide photocatalysts in nanoscale can further improve their photodegradation efficiency. Nanoscale features of the photocatalysts promote enhance light absorption and improved photon harvest property by refining the process of charge carrier generation and recombination at the semiconductor surfaces and in that way boost hydroxyl radicals. The literature covering semiconductor nanomaterials and nanocomposite-assisted photocatalysis-and, among those, metal oxide nanofibers-suggest that this is an attractive route for environmental remediation due to their capability of reaching complete mineralization of organic contaminants under mild reaction conditions such as room temperature and ambient atmospheric pressure with greater degradation performance. The main aim of this review is to highlight the most recent published work in the field of metal oxide nanofibrous photocatalyst-mediated degradation of organic pollutants and unsafe microorganisms present in wastewater. Finally, the recycling and reuse of photocatalysts for viable wastewater purification has also been conferred here and the latest examples given.

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Section: Introductionmentioning

confidence: 99%

Recent Advances in the Synthesis of Metal Oxide Nanofibers and Their Environmental Remediation Applications

Mondal

2017

Inventions

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“…surface area and density of defects in conjunction with thermal treatment [27]. To unveil the dependency of surface area and density of defects on PCA, we have chosen ZnO as a model semiconductor as it is vastly studied in the context of PCA [10,16,18,[28][29][30][31][32][33][34]. While reducing the dimensions of the catalysts (increasing the specific surface area), an increase in the density of surface states is inevitable due to the dangling orbitals [35], in addition to intrinsic lattice defects [36].…”

Section: Introductionmentioning

confidence: 99%

Transformation of polymer-ZnO core–shell nanofibers into ZnO hollow nanofibers: Intrinsic defect reorganization in ZnO and its influence on the photocatalysis

Kayacı

Vempati

Özgit-Akgün

et al. 2015

Applied Catalysis B: Environmental

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a b s t r a c tPhotocatalytic activity (PCA) on semiconductors is known to be majorly influenced by specific surface area and intrinsic lattice defects of the catalyst. In this report, we tested the efficiencies of 1D ZnO catalysts of varying fiber diameter (80 nm and 650 nm of inner diameter) in two formats, viz. core-shell and hollow nanofibers, where the former is calcined to yield the latter. These nanofibrous catalysts were produced by combining electrospinning and atomic layer deposition processes which were then subjected to thorough characterization including photoluminescence (PL) unveiling the details of intrinsic defects/densities. During the thermal treatment, intrinsic defects are reorganized and as a result a new PL band is observed apart from some significant changes in the intensities of other emissions. The densities of various intrinsic defects from PL are compared for all samples and juxtaposed with the PCA. Careful scrutiny of the various results suggested an anti-correlation between surface area and PCA; i.e., higher surface area does not necessarily imply better PCA. Beyond a limit, the most deterministic factor would be the density of surface defects rather than the specific surface area. The results of this study enable the researchers to fabricate 1D semiconductor photocatalysts while striking the balance between surface area and density of defects.

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“…Electrospinning has emerged as an attractive and simple method for the preparation of nanometer or submicrometer fibrous materials . Meanwhile, a good polymer support be stable against degradation by strong oxidative radicals generated by the photocatalyst when its surface is irradiated , , .…”

Section: Introductionmentioning

confidence: 99%

Supported Electrospun Ultrafine Fibrous Poly(tetrafluoroethylene)/ZnO Porous Membranes and their Photocatalytic Applications

Huang

Xiao

et al. 2017

Chem Eng & Technol

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Supported photocatalytic poly(tetrafluoroethylene) (PTFE)/ZnO porous membranes were prepared by sintering electrospun PTFE/poly(vinylalcohol)/zinc acetate dehydrate composite membranes. Electrospun PTFE membranes were utilized as supports with excellent chemical stability and high specific surface area, while the photocatalyst-ZnO particles derived from the thermal decomposition of zinc acetate dehydrate were homogeneously immobilized on the surface of ultrafine PTFE fibers. The PTFE/ZnO membranes could be easily recovered and reused after water treatment. PTFE/ZnO membranes are expected to have a wide range of potential applications in photocatalysis and photocatalysis-membrane reactors, playing the role of a catalyst as well as a selective barrier against contaminants of interest.

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Radially Oriented ZnO Nanowires on Flexible Poly‐l‐Lactide Nanofibers for Continuous‐Flow Photocatalytic Water Purification

Cited by 59 publications

References 28 publications

Recent Advances in the Synthesis of Metal Oxide Nanofibers and Their Environmental Remediation Applications

Recent Advances in the Synthesis of Metal Oxide Nanofibers and Their Environmental Remediation Applications

Transformation of polymer-ZnO core–shell nanofibers into ZnO hollow nanofibers: Intrinsic defect reorganization in ZnO and its influence on the photocatalysis

Supported Electrospun Ultrafine Fibrous Poly(tetrafluoroethylene)/ZnO Porous Membranes and their Photocatalytic Applications

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