The attractive efficiency contributed by the in-situ reactivation of ferrous oxalate in heterogeneous Fenton process

Hu, Lingquan; Wang, Pei; Xiong, Siwei; Chen, Shaohua; Yin, Xianze; Wang, Luoxin; Wang, Hua

doi:10.1016/j.apsusc.2018.10.151

Cited by 36 publications

(9 citation statements)

References 47 publications

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“…The main characteristic peaks at 289.2 eV are attributed to C from C 2 O 4 2– . The peaks at 285.2 and 286.9 eV are assigned to C–C and C–O, respectively . The peak at 289.7 eV corresponds to CO 3 2– , which may come from the X-ray-induced decomposition of oxalate .…”

Section: Results and Discussionmentioning

confidence: 99%

In Situ Fabrication of Nickel–Iron Oxalate Catalysts for Electrochemical Water Oxidation at High Current Densities

Babar

Patil

Karade

et al. 2021

ACS Appl. Mater. Interfaces

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Ni–Fe-based electrode materials are promising candidates for the oxygen evolution reaction (OER). The synergy between Fe and Ni atoms is crucial in modulating the electronic structure of the active site to enhance electrochemical performance. Herein, a simple chemical immersion technique was used to grow Ni–Fe oxalate nanowires directly on a porous nickel foam substrate. The as-prepared Ni–Fe oxalate electrode exhibited an excellent electrochemical performance of the OER with ultralow overpotentials of 210 and 230 mV to reach 50 and 100 mA cm–2 current densities, respectively, in a 1 M KOH aqueous solution. The excellent OER performance of this Ni–Fe oxalate electrode can be attributed to its bimetallic composition and nanowire structure, which leads to an efficient ionic diffusion, high electronic conductivity, and fast electron transfer. The overall analysis indicates a suitable approach for designing electrocatalysts applicable in energy conversion.

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Section: Results and Discussionmentioning

confidence: 99%

In Situ Fabrication of Nickel–Iron Oxalate Catalysts for Electrochemical Water Oxidation at High Current Densities

Babar

Patil

Karade

et al. 2021

ACS Appl. Mater. Interfaces

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“…In their case, a combination of 0.5 g/L of catalyst and hydrogen peroxide (30 mg/L) led to 94% and 97.2% of MB (10 ppm solution) degradation within 10 and 15 min, respectively [16]. Hence, the percent degradation was improved under a xenon lamp irradiation (500 W), reaching over 95% within 3 min, and 98.4% in 10 min [16]. The photocatalytic activity of ferrous oxalate has been also explored for degradation of other cationic and anionic dyes like rhodamine B [17] and indigo red [18], respectively.…”

Section: Introductionmentioning

confidence: 98%

“…As such, degradation of MB (20 ppm solution) up to 50 and 90% was reported within 1 and 3 h, respectively, when 0.5 g/L of recovered ferrous oxalate was used as catalyst under simulated sun light [15]. Also, Hu et al [16] used ferrous oxalate to degrade MB but in Fenton and photo-Fenton processes. In their case, a combination of 0.5 g/L of catalyst and hydrogen peroxide (30 mg/L) led to 94% and 97.2% of MB (10 ppm solution) degradation within 10 and 15 min, respectively [16].…”

Section: Introductionmentioning

confidence: 99%

“…Also, Hu et al [16] used ferrous oxalate to degrade MB but in Fenton and photo-Fenton processes. In their case, a combination of 0.5 g/L of catalyst and hydrogen peroxide (30 mg/L) led to 94% and 97.2% of MB (10 ppm solution) degradation within 10 and 15 min, respectively [16]. Hence, the percent degradation was improved under a xenon lamp irradiation (500 W), reaching over 95% within 3 min, and 98.4% in 10 min [16].…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic activity of Fe/Ti-based compounds obtained from ferro-titaniferous mineral sands via a simple soft chemistry route

Galeas

Valdivieso-Ramírez

Pontón

et al. 2022

J. Phys.: Conf. Ser.

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Fe/Ti-based compounds were synthesized from ferro-titaniferous mineral sands using aqueous oxalic acid under subcritical water (sCW) conditions (135°C/50 bar/4 h) and their photocatalytic activity was evaluated against methylene blue or caffeine under UV-A and visible radiation. The X-ray diffraction and Raman spectroscopy analyses revealed that the as-synthetized compounds were mainly comprised of ferrous oxalate, followed by titanium dioxide. This proved the complete transformation of the mineral precursor within 4 h using oxalic acid/sCW as the reaction medium. The photocatalytic studies showed that methylene blue and caffeine were photodegraded under UV-A and visible radiation by the as-synthesized Fe/Ti-based compounds. Methylene blue removal was up to 92.8 and 97.4% after 6 hours under UV-A or visible irradiation, respectively. Caffeine removal, however, reached 69.3 and 59.6% after 16 h of exposure to UV-A and visible light, respectively. The as-synthesized compounds can be potentially used as a ferrous-based catalyst in heterogeneous photocatalysis for decontamination of water systems from organic pollutants.

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“…[27][28][29]. Although ferrous oxalate is less common, it is considered an effective heterogeneous catalyst in advanced oxidation processes for eliminating a series of persistent organic pollutants from wastewaters [30][31][32][33]. It can also be a precursor for the synthesis of other materials such as ferrate (VI), whose ion has a strong oxidizing potential, beneficial for water treatment [34].…”

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Iron and Titanium-Based Compounds Using Black Mineral Sands and Oxalic Acid under Subcritical Water Conditions

et al. 2022

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Black mineral sands are widely used to obtain titanium dioxide, titanium, and, more recently, a variety of iron–titanium oxide nanostructures. Highly corrosive mineral acids or alkalis are commonly employed for this purpose. Hence, it is desirable to find eco-friendly ways to process these minerals, deriving high-added value materials. In this study, an Ecuadorian mineral sand precursor (0.6FeTiO3∙0.4Fe2O3 solid solution) was treated with oxalic acid aqueous solutions under subcritical water conditions. The synthesis was conducted in a batch reactor operating at 155 °C, 50 bar, and 700 rpm for 12 h, varying the oxalic acid concentration (0.1, 0.5 to 1.0 M). The as-obtained compounds were physically separated, dried, and analyzed by X-ray powder diffraction, scanning electron microscopy, and Raman spectroscopy. The characterization showed that the precursor was completely converted into two main products, ferrous oxalate, and titanium dioxide polymorphs. Rutile was always found in the as-synthesized products, while anatase only crystallized with high oxalic acid concentrations (0.5 and 1.0 M). These results open the possibility to develop more sustainable routes to synthesize iron and titanium-based materials with promising applications.

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The attractive efficiency contributed by the in-situ reactivation of ferrous oxalate in heterogeneous Fenton process

Cited by 36 publications

References 47 publications

In Situ Fabrication of Nickel–Iron Oxalate Catalysts for Electrochemical Water Oxidation at High Current Densities

In Situ Fabrication of Nickel–Iron Oxalate Catalysts for Electrochemical Water Oxidation at High Current Densities

Photocatalytic activity of Fe/Ti-based compounds obtained from ferro-titaniferous mineral sands via a simple soft chemistry route

One-Step Synthesis of Iron and Titanium-Based Compounds Using Black Mineral Sands and Oxalic Acid under Subcritical Water Conditions

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