α-Ferrous oxalate with different micro scale: Synthesis and catalytic degradation effect to rhodamine B

Wang, Guohui; Zhou, Annan; Xu, Qinghong

doi:10.1016/j.solidstatesciences.2019.03.004

Cited by 21 publications

(6 citation statements)

References 26 publications

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“…FTIR analysis further confirmed the presence of MnC 2 O 4 ·2H 2 O formed in Mn-BC. The IR bands at 1557, 1342, 1315, and 716 cm –1 correspond to oxalate (C 2 O 4 2– ) vibration ,, and the peak at 513 cm –1 is attributed to the stretching vibration of Mn–O (Table S2), , which demonstrated that Mn-BC and MnBC-H x surface mainly contain MnC 2 O 4 . Compared with the MnC 2 O 4 ·2H 2 O standard, the FTIR band at 3342 cm –1 is assigned to the O–H stretching of coordinated water molecules (Figure b), validating the presence of MnC 2 O 4 ·2H 2 O in the Mn-BC sample.…”

Section: Resultsmentioning

confidence: 98%

“…However, the XPS spectra showed that the peak of Ca on the surface of biochar was almost invisible, while the Ca content detected by EDS was only ∼12%, indicating that most of the Ca may be wrapped in carbon, not on the surface. Furthermore, XRD showed that the weak peak of CaC ) vibration 27,45,46 and the peak at 513 cm −1 is attributed to the stretching vibration of Mn−O (Table S2), 47,48 which demonstrated that Mn-BC and MnBC-Hx surface mainly contain MnC 2 O 4 . Compared with the MnC 2 O 4 •2H 2 O standard, the FTIR band at 3342 cm −1 is assigned to the O−H stretching of coordinated water molecules (Figure 2b), validating the presence of MnC 2 O 4 •2H 2 O in the Mn-BC sample.…”

Section: Characterization Of Mn-bcmentioning

confidence: 99%

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Insights into O₂ Activation via Mn^IIIOOH Species on Mn-Rich Biochar

Fang,

Ying,

Niu

et al. 2023

ACS Catal.

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Although metal-rich biochar (M-BC) is widely used in soil remediation and pollution control, the activation mechanism of molecular oxygen (O2) by M-BC still needs to be clarified due to the low metal loading. In this study, we enhanced the manganese content of low-temperature manganese-rich biochar (Mn-BC) by treating it with hydrogen peroxide (H2O2), resulting in the formation of MnBC-Hx (where x represents the volume of H2O2 used in mL). MnBC-H5 was particularly effective in activating O2, leading to the successful degradation of phenol and dyes. Characterizations showed that the MnII in the outer layer of MnC2O4·2H2O nanoparticles evenly dispersed over Mn-BC was oxidized to MnIII by H2O2. This process was accompanied by the removal of coordinated H2O, resulting in the formation of MnIIIC2O4 on MnBC-H5. Under visible light irradiation, MnIII can bind to O2 to form MnIIIOOH species, which facilitates the transfer of charges and generates superoxide radicals (·O2 –) that effectively degrade organics. Notably, MnIII of MnBC-H5 remains stable after the organic degradation reaction. This study will not only provide a theoretical basis for developing environmentally friendly biochar-based catalysts but also promote the study of the environmental effects of biochar.

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Section: Resultsmentioning

confidence: 98%

Section: Characterization Of Mn-bcmentioning

confidence: 99%

Insights into O₂ Activation via Mn^IIIOOH Species on Mn-Rich Biochar

Fang,

Ying,

Niu

et al. 2023

ACS Catal.

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“…There are numerous experimental studies on the surfactant regulation of morphology and size of ferrous oxalate dihydrate [7,9–11,14–15] . Ang et al [9] .…”

Section: Introductionmentioning

confidence: 99%

“…They pointed out that the hydroxyl functional group on the PVA molecular structure has a coordination effect on Fe 2 + , which affects the nucleation and growth of ferrous oxalate dihydrate crystals. Wang et al [15] added glucose during the synthesis of ferrous oxalate dihydrate. Many hydrogen bonds were formed between the polyhydroxyl structure of glucose and H 2 O.…”

Section: Introductionmentioning

confidence: 99%

Regulation of Ethanol on Ferrous Oxalate Particle Size and Properties: Theoretical and Experimental Study

Tang,

Zhao,

Ren

et al. 2024

ChemistrySelect

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Surfactants containing hydroxyl functional groups have a significant influence on the morphology of ferrous oxalate dihydrate. However, few studies have provided a theoretical explanation for this effect. In this investigation, the size of ferrous oxalate dihydrate was reduced from micron to nanometer scale using anhydrous ethanol, and its mechanism was elucidated through density functional theory calculations. The calculational results reveal that anhydrous ethanol molecules bound to the ferrous oxalate dihydrate crystal via hydrogen bonding and van der Waals forces, thereby controlling crystal growth. It means that anhydrous ethanol molecules preferentially affected the interlayer interaction in the structure of ferrous oxalate dihydrate, leading to a significant impact on its overall crystal growth way. Furthermore, the electrochemical properties of ferrous oxalate dihydrate synthesized in aqueous and anhydrous ethanol systems were compared and tested. The specific capacitance (242 F ⋅ g−1 at 0.5 A ⋅ g−1 current density) of ferrous oxalate dihydrate synthesized in anhydrous ethanol system is obvious higher than that of ferrous oxalate dihydrate synthesized in water system (186 F ⋅ g−1), due to its smaller particle size (75 nm). Furthermore, the specific capacitance of this material can be improved to 469 F ⋅ g−1 during composite process of ferrous oxalate dihydrate with graphene oxide.

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“…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. In addition, ferrous oxalate has proven to be effective in the oxidation of the herbicide 2,4-dichlorophenoxyacetic acid [19].…”

Section: Introductionmentioning

confidence: 99%

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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α-Ferrous oxalate with different micro scale: Synthesis and catalytic degradation effect to rhodamine B

Cited by 21 publications

References 26 publications

Insights into O₂ Activation via Mn^IIIOOH Species on Mn-Rich Biochar

Insights into O₂ Activation via Mn^IIIOOH Species on Mn-Rich Biochar

Regulation of Ethanol on Ferrous Oxalate Particle Size and Properties: Theoretical and Experimental Study

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

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α-Ferrous oxalate with different micro scale: Synthesis and catalytic degradation effect to rhodamine B

Cited by 21 publications

References 26 publications

Insights into O2 Activation via MnIIIOOH Species on Mn-Rich Biochar

Insights into O2 Activation via MnIIIOOH Species on Mn-Rich Biochar

Regulation of Ethanol on Ferrous Oxalate Particle Size and Properties: Theoretical and Experimental Study

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

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Insights into O₂ Activation via Mn^IIIOOH Species on Mn-Rich Biochar

Insights into O₂ Activation via Mn^IIIOOH Species on Mn-Rich Biochar