ZnO-PLLA Nanofiber Nanocomposite for Continuous Flow Mode Purification of Water from Cr(VI)

Burks, Terrance; Akthar, F.; Saleemi, Mohsin; Àvila, Marta; Kiros, Yohannes

doi:10.1155/2015/687094

Cited by 9 publications

(5 citation statements)

References 34 publications

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“…This is due to the increase in adsorption active sites because of introduction of amine functional groups onto GO surface. We have also compared the maximum adsorption capacity value of NH 2 -GO/ZnO-ZnFe 2 O 4 with the other reported adsorbents for Cr(VI) removals and represented in Table S2. ,,− It is observed that NH 2 -GO/ZnO-ZnFe 2 O 4 is an effective adsorbent toward the adsorption of Cr(VI).…”

Section: Resultsmentioning

confidence: 99%

Amine-Functionalized GO Decorated with ZnO-ZnFe₂O₄ Nanomaterials for Remediation of Cr(VI) from Water

Sahoo

Hota

2019

ACS Appl. Nano Mater.

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Amine functionalized graphene oxide (NH 2 -GO) decorated with ZnO-ZnFe 2 O 4 nanomaterials (NH 2 -GO/ZnO-ZnFe 2 O 4 ) was successfully synthesized by organic transformation reaction followed by hydrothermal method. The formation, composition, bonding, size, morphology, and surface area of synthesized nanomaterial were analyzed by XRD, FTIR, Raman, XPS, FESEM, HRTEM, and BET analytical techniques. The formation of ZnO-ZnFe 2 O 4 binary phase onto the amine functionalized GO was confirmed by XRD and HRTEM. The surface composition and functionalization of prepared nanocomposite were confirmed by XPS and FTIR analysis. The FESEM images revealed the formation of fine spherical ZnO-ZnFe 2 O 4 nanoparticle onto the NH 2 -GO surface. From TEM image, the average particle size of the composite nanomaterials was observed to be 8 nm. From N 2 adsorption−desorption study, it was found that NH 2 -GO/ZnO-ZnFe 2 O 4 composite nanomaterials show higher surface area (122 mg/g) than GO/ZnO-ZnFe 2 O 4 and NH 2 -GO. The obtained nanocomposite was used as novel adsorbent for remediation of chromium (Cr(VI)) from water. Batch adsorption experimental studies revealed that the Cr(VI) adsorption onto NH 2 -GO/ZnO-ZnFe 2 O 4 surface was pH dependent and maximum adsorption takes place at pH = 4. Compared to other prepared nanomaterials, adsorption capacity of NH 2 -GO/ZnO-ZnFe 2 O 4 was found to be higher because of the presence of more surface active sites by functionalizing ZnO-ZnFe 2 O 4 nanomaterials and also introducing amine group on the GO surface. Adsorptive removal of Cr(VI) onto nanocomposite surface follows a pseudo second order kinetics. Langmuir model was best fitted to the adsorption data. The process of adsorption was spontaneous and endothermic in nature. The maximum uptake capacity of NH 2 -GO/ZnO-ZnFe 2 O 4 was observed to be 109.89 mg/g and was higher than that of NH 2 -GO and GO/ZnO-ZnFe 2 O 4 nanocomposites. The mechanism of Cr(VI) adsorption follows electrostatic attraction and formation of chelate with amine groups.

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Section: Resultsmentioning

confidence: 99%

Amine-Functionalized GO Decorated with ZnO-ZnFe₂O₄ Nanomaterials for Remediation of Cr(VI) from Water

Sahoo

Hota

2019

ACS Appl. Nano Mater.

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“…1 Concerning the strategies for the purification of water contaminated with heavy metals, the use of systems based on polymer membranes has been extensively preferred due to suitable mechanical performance that these materials provide for highpressure processes and their versatility of thermal and chemical properties. [18][19][20][21][22][23][24] Three main approaches for fabricating polymer/ZnO fibrous membranes have been explored: (1) electrospinning of a polymer solution containing ZnO nanoparticles, 22,[25][26][27][28] (2) deposition of ZnO nanoparticles onto electrospun membranes by several methods, namely, impregnation, electrospraying, or similar techniques, [29][30][31][32][33][34][35] and in a minor extent (3) coaxial electrospinning. [2][3][4] In this context, electrohydrodynamic techniques provide excellent approaches for the design of nanofibrous polymeric membranes with tailored morphology.…”

Section: Introductionmentioning

confidence: 99%

Core–sheath nanofibrous membranes based on poly(acrylonitrile‐butadiene‐styrene), polyacrylonitrile, and zinc oxide nanoparticles for photoreduction of Cr(VI) ions in aqueous solutions

Castro‐Ruíz¹,

Rodríguez-Tobías²,

Abraham

et al. 2019

J of Applied Polymer Sci

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This investigation addresses the design of a series of poly(acrylonitrile-butadiene-styrene)/polyacrylonitrile-zinc oxide(ABS/PAN-ZnO) membranes by coaxial electrospinning. In the first instance, an optimization of ABS and PAN electrospinning was performed, thus establishing suitable compositional and processing parameters for obtaining homogenous fibers. Then, coaxial electrospinning of ABS and PAN solutions containing different amount of ZnO nanoparticles was carried out. The coaxial morphology of the nanofibers and ZnO distribution/dispersion were studied by the combination of several techniques such as scanning electron microscopy, X-ray energy dispersive analysis, contact angle, and thermogravimetric analysis. The performance of the obtained membranes for chromium (VI) ions removal from aqueous solutions was assessed by photoreduction using ultraviolet-visible spectroscopy. Electrospun mats composed of ABS (core)/PAN (sheath) embedded with 30 wt % of ZnO nanoparticles exhibited the highest chromium photoreduction (about 80%), suggesting the potential use of these membranes as filters for water purification.

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“…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. The same electrospun ZnO-poly-L-lactide nanofibers photocatalysts have been used for the adsorption of Cr(VI) as a crucial step for water purification by Burks et al [13].…”

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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ZnO-PLLA Nanofiber Nanocomposite for Continuous Flow Mode Purification of Water from Cr(VI)

Cited by 9 publications

References 34 publications

Amine-Functionalized GO Decorated with ZnO-ZnFe₂O₄ Nanomaterials for Remediation of Cr(VI) from Water

Amine-Functionalized GO Decorated with ZnO-ZnFe₂O₄ Nanomaterials for Remediation of Cr(VI) from Water

Core–sheath nanofibrous membranes based on poly(acrylonitrile‐butadiene‐styrene), polyacrylonitrile, and zinc oxide nanoparticles for photoreduction of Cr(VI) ions in aqueous solutions

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

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ZnO-PLLA Nanofiber Nanocomposite for Continuous Flow Mode Purification of Water from Cr(VI)

Cited by 9 publications

References 34 publications

Amine-Functionalized GO Decorated with ZnO-ZnFe2O4 Nanomaterials for Remediation of Cr(VI) from Water

Amine-Functionalized GO Decorated with ZnO-ZnFe2O4 Nanomaterials for Remediation of Cr(VI) from Water

Core–sheath nanofibrous membranes based on poly(acrylonitrile‐butadiene‐styrene), polyacrylonitrile, and zinc oxide nanoparticles for photoreduction of Cr(VI) ions in aqueous solutions

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

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Amine-Functionalized GO Decorated with ZnO-ZnFe₂O₄ Nanomaterials for Remediation of Cr(VI) from Water

Amine-Functionalized GO Decorated with ZnO-ZnFe₂O₄ Nanomaterials for Remediation of Cr(VI) from Water