Surface Reactivity of Iron Oxide Pigmentary Powders toward Atmospheric Components: XPS and Gravimetry of Oxygen and Water Vapor Adsorption

Ismail, Hamdy M.; Cadenhead, D. A.; Zaki, Mohamed I.

doi:10.1006/jcis.1996.0553

Cited by 29 publications

(9 citation statements)

References 13 publications

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“…The peaks at approximately 1600 cm -1 to 1647 cm -1 were the result of the asymmetric deformation vibration of NH þ 3 . The new peaks of the modified biochar at 1048 cm -1 and 757 cm -1 belonged to Fe-O-P and P-C, respectively [25,26]. These findings indicated that phosphorus was adsorbed by the modified biochar, which corresponds to the results of the XPS analysis.…”

Section: Ftir Characterizationsupporting

confidence: 74%

Removing phosphorus from aqueous solutions by using iron-modified corn straw biochar

Liu

Zuo

Chi

et al. 2015

Front. Environ. Sci. Eng.

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Iron-modified corn straw biochar was used as an adsorbent to remove phosphorus from agricultural runoff. When agricultural runoffs with a total phosphorus (TP) concentration of 1.86 mg$L -1 to 2.47 mg$L -1 were filtered at a hydraulic retention time of 2 h through a filtration column packed with the modified biochar, a TP removal efficiency of over 99% and an effluent TP concentration of less than 0.02 mg$L -1 were achieved. The isotherms of the phosphorus adsorption by the modified biochar fitted the Freundlich equation better than the Langmuir equation. The mechanism of the phosphorus adsorbed by the modified biochar was analyzed by using various technologies, i.e. scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). The results indicated that the surface of the modified biochar was covered by small iron granules, which were identified as Fe 3 O 4 . The results also showed that new iron oxides were formed on the surface of the modified biochar after the adsorption of phosphorus. Moreover, new bonds of Fe-O-P and P-C were found, which suggested that the new iron oxides tend to be Fe 5 (PO 4 ) 4 (OH) 3 . Aside from removing phosphorus, adding the modified biochar into soil also improved soil productivity. When the modified biochar-to-soil rate was 5%, the stem, root, and bean of broad bean plants demonstrated increased growth rates of 91%, 64%, and 165%, respectively.

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Section: Ftir Characterizationsupporting

confidence: 74%

Removing phosphorus from aqueous solutions by using iron-modified corn straw biochar

Liu

Zuo

Chi

et al. 2015

Front. Environ. Sci. Eng.

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“…Two peaks at ~533.5 eV and ~532.6 eV are observed both for phenolic resin foam and carbon foam in the high-resolution XPS spectra of O1s in Figure 3C, which correspond to the C-O and C=O groups in phenolic resin and graphite oxide [19]. By comparison, the additional peak at ~530.3 eV indicates the formation of Fe2O3 inside the magnetic carbon foam, which is consistent with the two deconvoluted peaks at ~710.7 eV and ~724.3 eV from the spectrum of Fe2p of the magnetic carbon foam in Figure 3D [20]. In addition, the peaks at the binding energies of ~722.9 eV, ~708.8 eV, and ~720.0 eV, which are the characteristic doublet from Fe 2p core-level electrons of Fe3C and α-Fe, indicate their formations during the pyrolysis processes [21].…”

Section: Characterization Of the Samplessupporting

confidence: 73%

A Novel Phenolic Foam-Derived Magnetic Carbon Foam Treated as Adsorbent for Rhodamine B: Characterization and Adsorption Kinetics

Zhang

Wang

et al. 2020

Crystals

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In recent decades, dye wastewaters produced by dye-manufacturing and dye-consuming industries have become a growing water pollution problem. Herein, a novel phenolic foam-derived magnetic carbon foam is synthesized by in-situ pyrolysis of iron acetylacetonate (Fe(acac)3) containing phenolic resin and its corresponding application as an adsorbent for the removal of Rhodamine B from effluent is investigated. The characterization of the as-prepared adsorbent is carried out by SEM, EDS, XRD, XPS, VSM, FT-IR, Raman, and BET. The magnetic carbon foam is observed to consist of a CFe15.1/C matrix modified with α-Fe/Fe3C/Fe2O3 composites, possessing a 3D porous architecture formed by inter-connected cells with diameters of 50–200 μm and narrow ligaments with thicknesses of ~20 μm. Experimental tests demonstrate that the equilibrium of adsorption behavior of Rhodamine B onto the obtained adsorbent can be reached within 40 min and the corresponding maximum adsorption capacity is 258.03 mg/g. The effects of contact time and adsorbent dosage on the adsorption performance are investigated. Besides, four models are introduced to fit the experimental data to evaluate the adsorption kinetics. The overall rate constant is determined by the chemisorption process, according to the pseudo-second order adsorption kinetics mechanism. Besides, the pH effect on RhB adsorption onto magnetic carbon foam is investigated, with the pH values varying from 3 to 10. The above results prove the application prospect of magnetic carbon foam prepared in this work in dye wastewater treatment.

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“…It is well known that Fe metal complexes are capable of binding oxygen reversibly or, in some special cases, binding oxygen irreversibly. [36][37][38] By donating an electron pair, an oxygen molecule could bind to the metal center (s-bond), accompanied by p back-donation of electron density to the oxygen molecule. 39,40 With such a balanced exchange of electron density, a reversible oxygen interaction occurs.…”

Section: Table 2 Esr Spin Mass Concentration (Smc) Of Pp-b and Pp-ofc...mentioning

confidence: 99%

Surface oxygen in plasma polymerized films

et al. 2009

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For plasma polymerized (PP) thin films, many practical optical, electronic, sensing, and bioapplications are closely related to their surface properties. In particular, the surfaces of many PP films have a strong affinity for oxygen and moisture. Therefore, three different types of monomers which do not contain oxygen were selected to fabricate PP films, in order to understand the mechanisms for surface oxygen absorption. These monomers were a hydrocarbon, benzene (B); ferrocene (FC), containing Fe ions which have a great affinity for oxygen; and octafluorocyclobutane (OFCB), containing the strong electronegative (and thus oxygen repellent) element fluorine. X-Ray photoelectron spectroscopy (XPS), Fourier transform infra-red (FTIR) spectroscopy, and electron spin resonance (ESR) were used to explore the chemical composition and structure of the resulting PP films. XPS depth-profiling was also used to investigate the oxygen content in the bulk of the films by analyzing the film surface after various amounts of argon etching. The initial oxygen content on the surface of the PP-FC films was the largest of the three while PP-OFCB films only contained a trace quantity. PP-B films had an intermediate concentration. Affinity for oxygen for this latter film was determined to be due to residual activated species including free radicals and dangling bond sites on the film surface. Depth profiling disclosed little oxygen a short distance into the PP-B films, indicating that the oxygen was attracted after deposition upon exposure to ambient conditions. Although the PP-B film exhibited a high concentration of free radicals as determined by ESR, the dense and crosslinked bulk structure shielded these active centers in the film by prohibiting oxygen diffusion. For the PP-FC films, although a decrease in the amount of oxygen was observed after etching, a substantial concentration of oxygen exists with the depth, indicating incorporation of oxygen during the initial deposition. Because of the chemical nature of fluorine, the as-deposited PP-OFCB films did not exhibit significant affinity towards oxygen. However, a slightly oxygen enriched film surface was present after argon etching due to changes in the surface chemistry and structure. These results demonstrate that the formation and distribution of oxygen on and within the PP films are strongly dependent upon the chemical composition and structure of the films.

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Surface Reactivity of Iron Oxide Pigmentary Powders toward Atmospheric Components: XPS and Gravimetry of Oxygen and Water Vapor Adsorption

Cited by 29 publications

References 13 publications

Removing phosphorus from aqueous solutions by using iron-modified corn straw biochar

Removing phosphorus from aqueous solutions by using iron-modified corn straw biochar

A Novel Phenolic Foam-Derived Magnetic Carbon Foam Treated as Adsorbent for Rhodamine B: Characterization and Adsorption Kinetics

Surface oxygen in plasma polymerized films

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