Degradation of methyl orange on Fe/Ag nanoparticles immobilized on polyacrylonitrile nanofibers using EDTA chelating agents

Chaúque, Eutilério F.C.; Ngila, Jane Catherine; Ray, Sekhar C.; Mamba, Bhekie B.

doi:10.1016/j.jenvman.2019.02.023

Cited by 21 publications

(8 citation statements)

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“…The palladization of the FeAg nanoparticles resulted in the appearance of Pd reflections, like the previously discussed Pd@Fe@HPEI/PMAA-PES. Similar observations have been reported for the palladization of Fe and Ag-based nanoparticles in the literature [ 18 , 19 , 20 ].…”

Section: Resultssupporting

confidence: 89%

“…Figure 4 b illustrates similarly shaped Pd@FeAg@HPEI nanoparticles, and these presented an average size of 28 ± 3 nm (16–51 nm), which are of smaller size as compared to Pd@Fe@HPEI. This observation can be attributed to improved chelation, as discussed in the previous subsections, for the XPS and enhanced crystallinity in the XRD data [ 5 , 10 , 12 , 16 , 18 , 19 , 20 , 21 , 22 , 25 ]. The stabilizer, HPEI proved to possess enhanced nanoparticle stabilization properties as 57 nm and 28 nm sized bi- and trimetallic nanoparticles were successfully prepared in this study.…”

Section: Resultsmentioning

confidence: 87%

“…Figure 3 b presents the Pd species from Pd@FeAg@HPEI appearing at 335.3, 338.1, 340.4, and 342.8 eV. The first peak indicates the existence of metallic palladium (Pd 0 ), with the rest of the peaks confirming the presence of ionic Pd [ 20 , 21 ]. Figure 3 c presents the Ag species in Pd@FeAg@HPEI; the peaks at 366.6 and 372.5 correspond to ionic silver.…”

Section: Resultsmentioning

confidence: 99%

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The Synthesis and Characterization of Novel Bi-/Trimetallic Nanoparticles and Their Nanocomposite Membranes for Envisaged Water Treatment

et al. 2020

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The impact of worldwide water scarcity, further exacerbated by environmental pollution, necessitates the development of effective water treatment membranes. Herein, we report the synthesis and characterization of nanocomposite membranes containing hyperbranched polyethyleneimine (HPEI) stabilized bi-and trimetallic nanoparticles. These membranes were prepared by blending a pre-grafted Polyethersulfone (PES) powder with the Pd@Fe@HPEI and Pd@FeAg@HPEI nanoparticles followed by phase inversion. The membranes, together with stabilized nanoparticles, were characterized by several analytical techniques, such as attenuated total reflectance–Fourier transform infra-red spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffractometry (XRD), optical contact angle (OCA), scanning electron microscopy (SEM), atomic force microscopy (AFM), and high-resolution transmission electron microscopy (HRTEM). These techniques revealed the elemental composition, zerovalent nature of the nanoparticles, and their small and even size distribution. Surface analysis showed chemical bonding between the polymeric functional groups and the supported nanoparticles. Furthermore, the nanocomposite membranes were found to be hydrophilic. Additionally, the membranes were investigated for swelling (water uptake), porosity, pore size, pure water permeation fluxes, and they indicated a decreased protein adhesion property. As such, the membranes fabricated in this work indicate the required properties for application in water treatment.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

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The Synthesis and Characterization of Novel Bi-/Trimetallic Nanoparticles and Their Nanocomposite Membranes for Envisaged Water Treatment

et al. 2020

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“…Dye wastewaters are usually produced by industrial processes, such as metal plating, paint, pulp and paper, textile, pharmaceutical, petrochemical industries, to mention but a few. The treatment of dye wastewater produced by textile industries has continued to attract much attention [1][2][3], due to their persistence in the environment, and conventional treatment methods are often insufficient to remove them completely from the environment [4,5]. Electrochemical oxidation is now considered a promising technique for the degradation of persistent organic pollutants present in wastewater.…”

Section: Introductionmentioning

confidence: 99%

“…Yusuf et al [20] observed an efficiency of almost 100% within 13 min for the degradation of methyl orange using a novel polymer disk electrode. Chaúque and co-workers [5] used Fe/Ag nanoparticles immobilized on polyacrylonitrile nanofibers for the MO removal, using EDTA chelating agents, and obtained >96% removal efficiency.…”

Section: Introductionmentioning

confidence: 99%

Strategies for Effective Degradation of Methyl Orange Dye in Aqueous Solution via Electrochemical Treatment with Copper/Graphite Electrodes

Oguzie,

Anyanwu,

Enyia

et al. 2024

Period. Polytech. Chem. Eng.

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This study investigated the electrochemical degradation of methyl orange dye (MO) in aqueous solution using copper/graphite electrodes as anode and cathode respectively. The process parameters such as electrolyte concentrations, current density, pH and temperature were analyzed. The results proved that copper/graphite electrodes were effective for MO degradation and the reaction followed the first-order kinetic model. The degradation efficiency decreased with increasing MO concentration and increased steadily with current density. The pH trend with degradation efficiency was pH 9 (98%) > pH 7 (96%) > pH 3 (77%) after 70 min of electrolysis time, which shows that the alkaline conditions favoured the degradation process. Fourier transform infrared spectroscopy (FTIR) and UV–Vis absorption spectroscopy confirmed the dye degradation process, with the formation of degradation intermediates. The FTIR results revealed that the oxidative degradation of MO may be initiated at the N=N azo bond, which was confirmed by quantum chemical modelling of the electronic structure parameters of MO.

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Cyclized Polyacrylonitrile as a Promising Support for Single Atom Metal Catalyst with Synergistic Active Site

Liu

Duan

Liang

et al. 2021

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to the metal nanoparticles, single-atom catalysts (SAC) display superior catalytic activity and selectivity in various metalcatalyzed process by virtue of their atomic dispersion, the highest atomic efficiency, and unsaturated coordination. [1,2] In this fast-developing field, several strategies have been provided for preparing metal single-atom materials, including impregnation strategy, coordination site construction strategy, spatial confinement strategy, defect design strategy, transforming metal nanoparticles into SAC, chemical etching, electrochemical method, etc. Accordingly, various supported metal single atom catalysts, including the most published Pt, Al, Fe, Pd, Co, and Ni, Cu, Au Rh, Ag, etc., have been demonstrated to exhibit good catalytic performance. [2][3][4][5][6] Because of their high surface free energy, single atoms are usually loaded on substrates with high surface area and abundant anchoring sites to prevent aggregation during synthetic and catalytic process. Typical supports include zeolite, [7] COFs/MOFs, [8] defect-rich oxides, sulfides, [9,10] nitrides, [11,12] carbon materials [13,14] and polymers. [15] When a single atom is well dispersed on the substrate, the metal-support interaction and coordination environment will change accordingly. In this regard, the support has a significant impact on tailoring the catalytic activity, selectivity and stability of a single atom.The polymers containing N, P, and S species were usually applicative to synthesize SAC via the strong coordination interaction. The reported methods usually require a pyrolysis process to produce heteroatom-doped carbon substrate that provides the coordination environment of anchoring metal atom. Chen et al. reported that single atom Fe catalysts with different coordination sites were fabricated by the pyrolysis of Fe-polyphthalocyanine at temperatures from 500-700 °C. [16] Perez-Ramirez and co-workers designed single gold atoms on nitrogen-doped carbon from polyaniline pyrolysis at 800 °C for molecular recognition in alkyne semi-hydrogenation and the single-atom Au/NC-T catalysts show selective structure sensitivity for different groups. [17] Because polymer materials need to be calcined at high temperatures, the processing properties of carbon materials become extremely poor, and it is difficult to further prepare catalysts for film formation or other shapes, which is conducive to industrial production. Based on this, Metal single atom catalysts (SAC) have been successfully used in heterogeneous catalysis but developing a scalable and economic support for SAC is still a great challenge. Here, cyclized polyacrylonitrile (CPAN) is proposed as a promising support for single atom metal catalysts. CPAN can be easily prepared from cheap industrial product polyacrylonitrile (PAN), which has excellent processability. A series of SAC on CPAN (M/CPAN, M = Ag, Cu, Ru) are designed and the catalytic activities of the as synthesized M/CPAN are investigated by the model reduction reaction of p-nitrophenol (4-NP). M/CPAN presents ex...

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Degradation of methyl orange on Fe/Ag nanoparticles immobilized on polyacrylonitrile nanofibers using EDTA chelating agents

Cited by 21 publications

References 43 publications

The Synthesis and Characterization of Novel Bi-/Trimetallic Nanoparticles and Their Nanocomposite Membranes for Envisaged Water Treatment

The Synthesis and Characterization of Novel Bi-/Trimetallic Nanoparticles and Their Nanocomposite Membranes for Envisaged Water Treatment

Strategies for Effective Degradation of Methyl Orange Dye in Aqueous Solution via Electrochemical Treatment with Copper/Graphite Electrodes

Cyclized Polyacrylonitrile as a Promising Support for Single Atom Metal Catalyst with Synergistic Active Site

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