Preparation and characterization of aligned iron nanorod using aqueous chemical method

Lin, Kuen‐Song; Wang, Ze‐Ping; Chowdhury, Sujan; Adhikari, Abhijit Krishna

doi:10.1016/j.tsf.2009.03.163

Cited by 15 publications

(16 citation statements)

References 31 publications

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“…Several diffraction peaks were obtained in the entire XRD spectrum ranging from 20 to 80°. The strong and sharp diffraction peak produced at about 2

θ = 44.6

° corresponds to NZVI‐NPs [12,14,18,19,27–29] . Similar findings were also analyzed in other research works for the preparation of NZVI‐NPs through sorghum bran, [30] green tea, [13] Terminalia chebula [11] and Eucalyptus leaves [8] .…”

Section: Resultssupporting

confidence: 84%

“…The strong and sharp diffraction peak produced at about 2q ¼ 44:6°corresponds to NZVI-NPs. [12,14,18,19,[27][28][29] Similar findings were also analyzed in other research works for the preparation of NZVI-NPs through sorghum bran, [30] green tea, [13] Terminalia chebula [11] and Eucalyptus leaves. [8] Furthermore, no other diffraction peaks of crystalline iron species were detected in the sample, signifying uniform dispersion of Fe species over extract polyphenol, producing small crystallite nanoparticles, which revealed the indication of larger specific surface area that can provide more reactive sites and higher photo-reactivity.…”

Section: Xrd Analysis For Phase Structure Of Nzvi-npssupporting

confidence: 76%

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Statistical Optimization and Modeling Approach for Fenton‐like Discoloration of Methyl Orange using Green Zero‐valent Iron Nanoparticle Catalysts

Chowdhury¹,

Al‐Mamun²,

Zulfiqar

et al. 2022

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Wastewater treatment is extremely beneficial to the environment by minimizing pollution. Water pollution caused by textile industries deteriorates ecosystems and threatens the environment. In this study, we fabricated nanoscale zerovalent iron nanoparticle (NZVI‐NPs) catalysts that act as Fenton‐like adsorbents, which remove methyl orange (MO) dye from wastewater much faster than microscale nanoparticles. The analysis of variance (ANOVA) led us to derive a quadratic model with R2=0.973. According to the central composite design in response surface methodology (CCD‐RSM) statistical optimization, 99.65 % of predicted decolorization was achieved with 1.0 g/L catalyst loading, pH initialization of 3.0, reaction temperature of 25 °C, and 22 mmol/L H2O2 concentration. By fitting a pseudo‐second‐order kinetic model, we calculated the rate constant of dye adsorption. The Langmuir isotherm demonstrated an excellent correlation between dye adsorption and catalyst with a maximum adsorption capacity (50.45 mg/g). The activation energy of the catalyst (62.26 kJ/mol) predicts a physical adsorption process. Newly developed catalysts are green efficient adsorbents suitable for significant dye removal from wastewater for the safety of aquatic life and human life. Moreover, these newly developed materials could be more suitable for the remediation of other harmful pollutants and the production of hydrogen, energy and water splitting applications.

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“…Several diffraction peaks were obtained in the entire XRD spectrum ranging from 20 to 80°. The strong and sharp diffraction peak produced at about 2

θ = 44.6

Section: Resultssupporting

confidence: 84%

Section: Xrd Analysis For Phase Structure Of Nzvi-npssupporting

confidence: 76%

Statistical Optimization and Modeling Approach for Fenton‐like Discoloration of Methyl Orange using Green Zero‐valent Iron Nanoparticle Catalysts

Chowdhury¹,

Al‐Mamun²,

Zulfiqar

et al. 2022

ChemistrySelect

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“…Whilst Konishi et al have compared directly the Fe K-edge XANES data for the α-, β-, and γ-FeOOH materials and the nearest resemblance to those in Fig. 2(b,c) is akaganéite, 122 the SEC data most closely resemble those of 2 line and 6 line ferrihydrite 53,58,100,[116][117][118]121,125 (the labelling refers to the number of diffraction peaks observed in X-ray powder diffractograms) rather than goethite (α-FeOOH), 53,73,100,114,116,118,121,122,126 akaganéite (β-FeOOH), 56,57,101,114,119,122 or lepidocrocite (γ-FeOOH). 53,116,121,122 The pre-edge features in Fig.…”

Section: Fe K-edge X-ray Absorption Spectroscopymentioning

confidence: 69%

“…As noted above, there is usually an edge shift of ca. 4 eV between Fe II and Fe III not only for coordination complexes but also for iron oxides, 72 iron sulfates, 100 wüstite to akaganéite, 101 and in fayalite 170 and ferrous hydroxychloride. 56 Whilst a shift of ca.…”

Section: Fe K-edge X-ray Absorption Spectroscopymentioning

confidence: 99%

How does iron interact with sporopollenin exine capsules? An X-ray absorption study including microfocus XANES and XRF imaging

et al. 2014

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Sporopollenin exine capsules (SECs) derived from plant spores and pollen grains have been proposed as adsorption, remediation and drug delivery agents. Despite many studies there is scant structural data available. This X-ray absorption investigation represents the first direct structural data on the interaction of metals with SECs and allows elucidation of their structure-property relationships. Fe K-edge XANES and EXAFS data have shown that the iron local environment in SECs (derived from Lycopodium clavatum) reacted with aqueous ferric chloride solutions is similar to that of ferrihydrite (FeOOH) and by implication ferritin. Fe Kα XRF micro-focus experiments show that there is a poor correlation between the iron distribution and the underlying SEC structure indicating that the SEC is coated in the FeOOH material. In contrast, the Fe Kα XRF micro-focus experiments on SECs reacted with aqueous ferrous chloride solutions show that there is a very high correlation between the iron distribution and the SEC structure, indicating a much more specific form of interaction of the iron with the SEC surface functional groups. Fe K-edge XANES and EXAFS data show that the Fe II can be easily oxidised to give a structure similar to, but not identical to that in the Fe III case, and that even if anaerobic conditions are used there is still partial oxidation to Fe III . CREATED USING THE RSC ARTICLE TEMPLATE (VER. 3.0) -SEE WWW.RSC.ORG/ELECTRONICFILES FOR DETAILS ARTICLE TYPE www.rsc.org/xxxxxx | XXXXXXXX 2 | Journal Name, [year], [vol], 00-00 ](ragweed with magnetite prepared from FeCl2 and FeCl3) have been proposed as a method for the removal of organic pollutants from aqueous media, 44 and those derived from Candida rugosa have shown excellent enatioselectivity. 45,46 Despite the large amount of work carried out on metal sorption and coordination to SECs there are very few reports on the nature of the interaction between the metal ions and the sporopollenin itself. It is important to understand how such conjugates are capable of fulfilling their roles to enable insights into new potential applications such as solid supports for metal catalysts. X-ray absorption spectroscopy (XAS) is able to probe the local structural environment around the element of interest. When carried out using micro-focus instrumentation it can provide both structural and chemical state imaging data from single exines. This approach has been used previously at the Fe K-edge to study geological [47][48][49][50][51] and soil samples, 52,53 archaeological specimens, 54-59 biological tissues [60][61][62][63][64][65][66][67][68] and cometary material. [69][70][71][72] Whilst there has been some X-ray absorption work on sporopollenin using the C K-edge (ca. 290 eV), which identified ketonic groups on the surface of the pollen grain and aliphatic carbon across the whole structure, 73 there appears to be no XAS experiments carried out at the metal K-edges in the literature. In this work we report an Fe K-edge XANES and EXAFS as well as an Fe Kα X-ray fluoresc...

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“…Among them, hematite is one of the most interesting and important metal oxides. [5][6][7][8] It is an n-type semiconductor with a direct band gap of 2.2 eV. It can be applied as a sensitizer or as a photocatalyst and has good chemical and photoelectrochemical stability, low cost, and ease of fabrication.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemistry of solution processed hematite nanoparticles, nanoparticle-chains and nanorods

et al. 2012

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We report a coordination chemistry approach for shape-controlled synthesis of a-Fe 2 O 3 (hematite) nanostructures. Three distinct morphologies viz. nanoparticles, nanoparticle-chains and nanorods were synthesized from inorganic iron precursor sources of nitrate, sulfate and chloride, respectively, in the presence of urea as a pH regulating agent and were characterized by X-ray diffraction, scanning electron microscopy and Raman spectroscopy. The responsible growth mechanism and possible factors controlling the morphologies are explored. Photoelectrochemical cells constructed by utilizing these nanostructures produced stable photocurrents in iodide electrolyte. The nanoparticle-chains morphology of a-Fe 2 O 3 revealed the highest photocurrent density of 0.36 mA cm 22 at 0 V bias conditions under 1 Sun illumination. The reason for the high performance is investigated with the help of impedance spectroscopy analysis, wherein the electrode composed of nanoparticle-chains affords the lowest charge transfer resistance and thereby the highest photoconversion yield, as compared to those of the nanoparticle and nanorod electrodes.

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Preparation and characterization of aligned iron nanorod using aqueous chemical method

Cited by 15 publications

References 31 publications

Statistical Optimization and Modeling Approach for Fenton‐like Discoloration of Methyl Orange using Green Zero‐valent Iron Nanoparticle Catalysts

Statistical Optimization and Modeling Approach for Fenton‐like Discoloration of Methyl Orange using Green Zero‐valent Iron Nanoparticle Catalysts

How does iron interact with sporopollenin exine capsules? An X-ray absorption study including microfocus XANES and XRF imaging

Photoelectrochemistry of solution processed hematite nanoparticles, nanoparticle-chains and nanorods

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