Ilmenite (FeTiO 3 ) as low cost catalyst for advanced oxidation processes

García‐Muñoz, Patricia; Pliego, Gema; Zazo, Juan A.; Bahamonde, A.; Casas, José A.

doi:10.1016/j.jece.2015.11.037

Cited by 74 publications

(19 citation statements)

References 32 publications

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“…Passivation of the surface of the mineral and, thus, oxidation of Fe(II) to Fe(III), seems to occur during the reaction, leading to the aforementioned almost complete deactivation of ilmenite. This finding is consistent with the progressive passivation of the ilmenite surface upon photocatalytic oxidation of phenol with H 2 O 2 recently reported in the literature [16].…”

Section: Reusability Testssupporting

confidence: 93%

“…To overcome those drawbacks, the application of UV or visible irradiation and/or the partial substitution of Fe by other metals such as Co, Cr, Mn, Cu or Ni has been investigated by several authors [6,[11][12][13][14][15]. UV and/or visible irradiation has proved to improve the efficiency by enhancing the production of hydroxyl radicals via decomposition of hydrogen peroxide as well as via photoreduction of Fe(III) to Fe(II) in the mineral surface [6,16]. On the other hand, although a rather increase of activity has been demonstrated by doping the minerals with Co [12,13], Cu [13], Cr [14] and Mn [12,13], the observed rates are still far from those achieved by the homogeneous Fenton process, and the efficiency of H 2 O 2 consumption has not been demonstrated [1].…”

Section: Introductionmentioning

confidence: 99%

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Naturally-occurring iron minerals as inexpensive catalysts for CWPO

Muñoz

Domínguez

Pedro

et al. 2017

Applied Catalysis B: Environmental

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This work explores the potential application of naturally-occurring minerals as inexpensive catalysts in heterogeneous Fenton, namely catalytic wet peroxide oxidation (CWPO). The availability, low cost and environmentally friendly character of those materials make them interesting candidates for such application. The performance of magnetite, hematite and ilmenite as CWPO catalysts has been tested under different working conditions, which include temperature (25–90 °C), H2O2 dose (250–1000 mg L−1) and catalyst concentration (1–4 g L−1). The operating temperature plays a key role on the rate of H2O2 decomposition so that with magnetite H2O2 conversion after 4 h increased from 8 to 99% by increasing the temperature from 25 to 90 °C. Based on the reaction mechanism proposed, a kinetic model was developed which successfully described the experimental results on H2O2 decomposition. The catalytic performance of the minerals tested at temperatures above the ambient was demonstrated using phenol (100 mg L−1) as target pollutant. Unprecedented efficiencies of H2O2 consumption, higher than 80% were achieved, allowing high oxidation and mineralization, i.e. complete phenol conversion and almost 80% TOC reduction at 75 °C with a catalyst loading of 2 g L−1 and the theoretical stoichiometric amount of H2O2 for complete mineralization of phenol (500 mg L−1). Magnetite is particularly attractive, since it showed the highest activity and can be easily separated from the liquid phase given its magnetic properties. All the minerals tested suffered low iron leaching and magnetite and hematite showed a good reusability upon three consecutive runs. However, in this case long-term durability is not a crucial issue, given the availability and low cost of these mineralsThis research has been supported by the Spanish MINECO through the project CTQ2013-4196-R and by the CM through the project S2013/MAE-2716. M. Muñoz thanks the Spanish MINECO for a Juan de la Cierva-Incorporación postdoctoral contract (IJCI-2014-19427

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Section: Reusability Testssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Naturally-occurring iron minerals as inexpensive catalysts for CWPO

Muñoz

Domínguez

Pedro

et al. 2017

Applied Catalysis B: Environmental

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“…Figure A shows the XPS spectrum for Fe‐2p, which is expressed in two bands for Fe‐2p 3/2 and Fe‐2p 1/2 with a satellite peak. The asymmetry profiles were given in two oxidation states of Fe 3+/2+ with doublet peak in the decomposition on referring to reports in the literatures . In the same time, the multivalent characteristics agree with the bond calculations.…”

Section: Discussionsupporting

confidence: 71%

Synthesis, optical, and magnetic properties of six‐layered Aurivillius bismuth ferrititanate

Huang

Qin

et al. 2018

J Am Ceram Soc

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This work reports on the preparation, structure, photochemical, and magnetic properties of six‐layered Aurivillius bismuth ferrititanates, that is, Bi7Ti3Fe3O21, Bi7(Ti2Nb)Fe3O21+δ, and Bi7(Ti2Mg)Fe3O21−δ nanoparticles. The samples were prepared through the modified citrate complexation and precursor film process. The XRD Rietveld refinements were conducted to study the phase formations and crystal structure. The morphological and chemical component characteristics were investigated using SEM, TEM, and EDX analyses. Bi7Ti3Fe3O21, Bi7(Ti2Nb)Fe3O21+δ, and Bi7(Ti2Mg)Fe3O21−δ nanoparticles present an indirect allowed transitions with band energies of 2.04, 2.03, and 2.02 eV, respectively. The hybridized (O2p+Fet2g+Bi6s) formed the valence band (VB) and electronic components of (Ti–3d+Fe–eg) formed the conduction band (CB) of this six‐layered Aurivillius bismuth ferrititanate. The three samples showed efficient photocatalytic degradation of Rhodamine B (RhB) dyes with the excitation wavelength λ > 420 nm. The optical absorption, photodegradation, and magnetic abilities were improved through microstructural modification on “B” site via partial substitution of Mg2+ and Nb5+ for Ti4+. The photocatalytic results were discussed based on the layer structure and multivalent Fe ions. Fe3+/2+ in the perovskite slabs (Bi5Fe3Ti3O19)2− could act as the catalytic mediators in the photocatalysis process. As a photocatalyst, Aurivillius Bi7(Ti2Mg)Fe3O21−δ nanoparticle is advantageous due to its photocatalytic and magnetically recoverable abilities.

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“…Catalytic Activity. Some reports present that some natural minerals containing TiO shows photocatalytic activity in advanced oxidation process [35,36]; therefore, the present raw ilmenite was conducted to test photocatalytic activity as a reference. Figure 8(a) presents the kinetics of TC degradation over TiO 2 , raw ilmenite, and TH-TiO 2 .…”

Section: Resultsmentioning

confidence: 99%

Synthesis of C-N-S-Tridoped TiO₂ from Vietnam Ilmenite Ore and Its Visible Light-Driven-Photocatalytic Activity for Tetracyline Degradation

Lan

Anh

et al. 2020

Journal of Nanomaterials

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In this study, C-N-S-tridoped TiO 2 composite was fabricated from TiO 2 prepared from ilmenite ore and thiourea by means of hydrothermal method. The obtained material was characterized by X-ray diffraction, Raman scattering spectroscopy, UV-Vis diffuse reflectance spectroscopy, nitrogen adsorption-desorption isotherms, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). It was found that C-N-S-tridoped TiO 2 material has a large specific surface area, showing good photocatalytic activity on the degradation of antibiotic tetracycline in visible light region. The study on the mechanism of tetracycline photodegradation using the liquid chromatography with mass spectrometry was performed. It was found that tetracycline has been degraded over C-N-S-tridoped TiO 2 catalyst into many different intermediates which can eventually be converted into CO 2 and H 2 O. The kinetics of photocatalytic decomposition of tetracycline were investigated. In addition, the obtained material could catalyze well the degradation of other antibiotics (ciprofloxacin and chloramphenicol) and dyes (rhodamine-B, methylene blue, and organe red). The catalyst was stable after five recycles with slight loss of catalytic activity, which indicates great potential for practical application of C-N-S-tridoped TiO 2 catalyst in treatment of wastewater containing tetracycline in particular or antibiotics in general.

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Ilmenite (FeTiO 3 ) as low cost catalyst for advanced oxidation processes

Cited by 74 publications

References 32 publications

Naturally-occurring iron minerals as inexpensive catalysts for CWPO

Naturally-occurring iron minerals as inexpensive catalysts for CWPO

Synthesis, optical, and magnetic properties of six‐layered Aurivillius bismuth ferrititanate

Synthesis of C-N-S-Tridoped TiO₂ from Vietnam Ilmenite Ore and Its Visible Light-Driven-Photocatalytic Activity for Tetracyline Degradation

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Ilmenite (FeTiO 3 ) as low cost catalyst for advanced oxidation processes

Cited by 74 publications

References 32 publications

Naturally-occurring iron minerals as inexpensive catalysts for CWPO

Naturally-occurring iron minerals as inexpensive catalysts for CWPO

Synthesis, optical, and magnetic properties of six‐layered Aurivillius bismuth ferrititanate

Synthesis of C-N-S-Tridoped TiO2 from Vietnam Ilmenite Ore and Its Visible Light-Driven-Photocatalytic Activity for Tetracyline Degradation

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Product

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Synthesis of C-N-S-Tridoped TiO₂ from Vietnam Ilmenite Ore and Its Visible Light-Driven-Photocatalytic Activity for Tetracyline Degradation