Polymer directed synthesis of NiO nanoflowers to remove pollutant from wastewater

Munkaila, Samira; Bentley, J.M.; Schimmel, Keith; Ahamad, Tansir; Alshehri, Saad M.; Bastakoti, Bishnu Prasad

doi:10.1016/j.molliq.2020.114676

Cited by 14 publications

(5 citation statements)

References 49 publications

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“…In previous studies, many inorganic fillers, such as metals and metal oxides, were employed to enhance different physical properties of the polymers (for example, the addition of Cu(Cu 2 O) to the polyethylene enhanced the electrical conductivity about five times [13]). Similarly, in other studies, the incorporation of filler electrical, thermal, and mechanical properties of epoxy significantly improved [14]. The polymers/MOs are showing their remarkable performances in the field of optoelectronics [15].…”

Section: Introductionsupporting

confidence: 59%

A Sequenced Study of Improved Dielectric Properties of Carbon Nanotubes and Metal Oxide-Reinforced Polymer Composites

et al. 2022

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Polymers have gained attraction at the industrial level owing to their elastic and lightweight nature, as well as their astonishing mechanical and electrical applications. Their scope is limited due to their organic nature, which eventually leads to the degradation of their properties. The aim of this work was to produce polymer composites with finely dispersed metal oxide nanofillers and carbon nanotubes (CNTs) for the investigation of their charge-storage applications. This work reports the preparation of different polymeric composites with varying concentrations of metal oxide (MO) nanofillers and single-walled carbon nanotubes (SWCNTs). The successful synthesis of nanofillers (i.e., NiO and CuO) was carried out via the sonication and precipitation methods, respectively. After, the smooth and uniform polymeric composite thin films were prepared via the solution-casting methodology. Spectroscopy and diffraction techniques were used for the preliminary characterization. Scanning electron microscopy was used to check the dispersion of carbon nanotubes (CNTs) and MOs in the polymer matrix. The addition of nanofillers and carbon nanotubes (CNTs) tuned the bandgap, reduced the strain, and enhanced the elastic limit of the polymer. The addition of CNT enhanced the mechanical strength of the composite; however, it increased the conductivity, which was tuned by using metal oxides. By increasing the concentration of NiO and CuO from 2% to 6% bandgap of PVA, which is 5–6 eV reduced to 4.41 and 4.34 eV, Young’s moduli of up to 59 and 57.7 MPa, respectively, were achieved. Moreover, improved dielectric properties were achieved, which shows that the addition of metal oxide enhances the dielectric behavior of the material.

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Section: Introductionsupporting

confidence: 59%

A Sequenced Study of Improved Dielectric Properties of Carbon Nanotubes and Metal Oxide-Reinforced Polymer Composites

et al. 2022

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“…Noble metal (Pd, Pt, Ru, Rh, Au, etc. )-supported catalysts are generally used for CH 4 elimination and Pd-supported catalysts have been reported to be highly active ,− ,,− mainly because of their ability to break the C–H bond with high binding energy in CH 4 under a relatively low energy barrier. ,,,,− Although noble metal-supported catalysts have high efficiency, their high price, limited source, sintering issue, and poisoning tendency limit their large-scale application. ,,,, Accordingly, the development of alternative catalysts based on non-noble metals is attractive, and single metal oxide-based catalysts such as MnO x , Co 3 O 4 , CuO, Fe 2 O 3 , NiO, and perovskite have been found to be highly active for methane combustion. ,,,− NiO, a p-type semiconductor, is of particular interest because of its unique chemical properties, high thermal stability, and low prices. − Recently, NiO nanomaterials with different morphologies, such as nanosheets, ,,,− nanoparticles, ,− nanorods, , and honeycomb-like nanostructures, have been reported successively and applied as catalysts, battery electrodes, and capacitors . However, there are not many reports about the application of NiO catalysts in methane catalytic combustion.…”

Section: Introductionmentioning

confidence: 99%

Nickel Hydroxide Nanosheets Prepared by a Direct Manual Grinding Strategy for High-Efficiency Catalytic Combustion of Methane

Guo

Zhu

et al. 2022

ACS Omega

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Nickel hydroxide nanosheets were prepared by a very simple direct manual grinding strategy and then calcined at 200, 300, 400, and 500°. The synthesized samples were tested in lean methane (1.0% CH 4 , air balanced) catalytic combustion and subjected to a series of physical and chemical characterizations. The sample calcined at 200 °C (Ni(OH) 2 -200) presented a typical nanosheet structure and the best methane catalytic activity in all the samples, which can completely catalyze methane at 400 °C. The crystal structure changed from β-Ni(OH) 2 to NiO at a calcination temperature of 300 °C. The β-Ni(OH) 2 nanosheets began to partially agglomerate into nanoparticles at 400 °C and almost transformed into nanoparticles at 500 °C. Interestingly, the original nanosheet samples Ni(OH) 2 -200 and NiO-300 still maintained their morphology and structure although they all went through an activity test at 500 °C in a 1.0% CH 4 atmosphere, which proves that the calcination of nanosheets in a CH 4 atmosphere tended to maintain their nanosheet morphology compared with calcination in the air. Furthermore, through the activity test, X-ray photoelectron spectroscopy results, TPx, and in situ DRIFTS characterization, it was proved that the hydroxyl groups on the Ni(OH) 2 -200 and NiO nanosheets were beneficial to the dissociation of methane on the catalyst surface, and the nanosheet structure was also prone to generating more active adsorbed oxygen, so the activation energy of methane was lowered. A methane catalytic mechanism on the Ni(OH) 2 nanosheets and NiO nanoparticles was proposed, which further proved the key role of hydroxyl groups in methane combustion.

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“…S15). Negative ζ-potential of 2SiO 2 approached isoelectric point after the adsorption of MB at the anionic sites in 2SiO 2 [63]. After desorption of MB, negatively charged sites were free and ζ-potential was close to the pristine 2SiO 2 .…”

Section: Regeneration and Reuse Of 2siomentioning

confidence: 90%

Template-free synthesis of hybrid silica nanoparticle with functionalized mesostructure for efficient methylene blue removal

et al. 2021

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Polymer directed synthesis of NiO nanoflowers to remove pollutant from wastewater

Cited by 14 publications

References 49 publications

A Sequenced Study of Improved Dielectric Properties of Carbon Nanotubes and Metal Oxide-Reinforced Polymer Composites

A Sequenced Study of Improved Dielectric Properties of Carbon Nanotubes and Metal Oxide-Reinforced Polymer Composites

Nickel Hydroxide Nanosheets Prepared by a Direct Manual Grinding Strategy for High-Efficiency Catalytic Combustion of Methane

Template-free synthesis of hybrid silica nanoparticle with functionalized mesostructure for efficient methylene blue removal

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