Pressure- and temperature-dependent Raman spectra of Ca2Fe2O5 oxygen defect perovskite

Zhai, Shuangmeng; Dai, Bo; Xue, Weihong; Rumney, Justin D.; Wang, Hu; Shieh, Sean R.; Wu, Xiang

doi:10.1016/j.saa.2022.121436

Cited by 5 publications

(3 citation statements)

References 32 publications

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“…The band at 1406 cm –1 of CO 3 2– in FC and 10FCZ–5 was assigned to Ca 2 Fe 2 O 5 medium-strong basic sites, which promoted CO 2 absorption. Furthermore, the different characteristics within the 680–720 cm –1 range were attributed to the lattice symmetry of Ca 2 Fe 2 O 5 in the FC sample, with the observed red shift indicating the Fe doping of the CaO lattice in the CO 2 conversion stage . In the CO 2 capture stage (Figure c), the peak at 530 cm –1 was attributed to the vibrational mode of ν(OCO), corresponding to the bicarbonate species.…”

Section: Resultsmentioning

confidence: 92%

“…Furthermore, the different characteristics within the 680−720 cm −1 range were attributed to the lattice symmetry of Ca 2 Fe 2 O 5 in the FC sample, with the observed red shift indicating the Fe doping of the CaO lattice in the CO 2 conversion stage. 44 In the CO 2 capture stage (Figure 11c), peak at 530 cm −1 was attributed to the vibrational mode of ν(OCO), corresponding to the bicarbonate species. This suggests that the surface hydrogen adsorbed on the Fe catalyst effectively facilitated the reduction of CO 3 2− , leading to the production of CO at the beginning of CO 2 capture (eq 6).…”

Section: ■ Experimental Sectionmentioning

confidence: 98%

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In Situ Capture and Conversion of CO₂ to CO Using CaZrO₃ Promoted Fe–CaO Dual-Functional Material

Gao,

Yuan,

Yang

et al. 2024

ACS Sustainable Chem. Eng.

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The urgent need to address global warming has led researchers to investigate various methods for capturing and utilizing CO 2 . One promising approach is the integration of calcium looping (CaL) and reverse water−gas shift (RWGS) reactions. Therefore, dual functional materials enriched with CaZrO 3 were introduced as effective catalysts, exhibiting a sustainable catalytic CO 2 conversion to 100% CO selectivity and a remarkable CO 2 adsorption capacity (16.69 mmol g DFM −1 ), CO yield (9.64 mmol g DFM −1), even under low hydrogen concentration (15% H 2 ) in CaL and RWGS processes. Surface chemistry analysis revealed that oxygen vacancies, acting adsorption sites, and lattice oxygen of CaZrO 3 can be activated by hydrogen. This activation, linked to the formation of strong basic sites with Zr 4+ -O 2− , significantly enhanced CO 2 conversion efficiency. The synergistic promotion mechanism was validated through in situ X-ray diffraction, DRIFTS, and Raman spectroscopy techniques. The bidentate formate mechanism was predominant, indicating that bicarbonates and hydroxyl synergistic promote CO 2 conversion in the high-temperature CaL−RWGS process. 10FCZ−5 showed good long-time stability, and the material maintained a high dispersion of Fe species after 10 cycles, demonstrating excellent absorbent capacity (11 mmol g DFM −1) and CO yield (6.2 mmol g DFM −1 ).

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Section: Resultsmentioning

confidence: 92%

Section: ■ Experimental Sectionmentioning

confidence: 98%

In Situ Capture and Conversion of CO₂ to CO Using CaZrO₃ Promoted Fe–CaO Dual-Functional Material

Gao,

Yuan,

Yang

et al. 2024

ACS Sustainable Chem. Eng.

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“…This suggests that the number of defects on the surface of OPBC decreased after impregnation with Fe3O4. The presence of Fe3O4 nanoparticles onto OPBC was confirmed by the occurrence of two weak broad peaks in the spectrum of MAG-OPBC located at 294 and 685 cm −1 , which could be credited to the existence of Fe-O bonds of the magnetic nanoparticles [51][52][53].…”

Section: Raman Analysismentioning

confidence: 87%

Performance of Pristine versus Magnetized Orange Peels Biochar Adapted to Adsorptive Removal of Daunorubicin: Eco-Structuring, Kinetics and Equilibrium Studies

et al. 2023

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Drugs and pharmaceuticals are an emergent class of aquatic contaminants. The existence of these pollutants in aquatic bodies is currently raising escalating concerns because of their negative impact on the ecosystem. This study investigated the efficacy of two sorbents derived from orange peels (OP) biochar (OPBC) for the removal of the antineoplastic drug daunorubicin (DNB) from pharmaceutical wastewater. The adsorbents included pristine (OPBC) and magnetite (Fe3O4)-impregnated (MAG-OPBC) biochars. Waste-derived materials offer a sustainable and cost-effective solution to wastewater bioremediation. The results showed that impregnation with Fe3O4 altered the crystallization degree and increased the surface area from 6.99 m2/g in OPBC to 60.76 m2/g in the case of MAG-OPBC. Placket–Burman Design (PBD) was employed to conduct batch adsorption experiments. The removal efficiency of MAG-OPBC (98.51%) was higher compared to OPBC (86.46%). DNB adsorption onto OPBC followed the D–R isotherm, compared to the Langmuir isotherm in the case of MAG-OPBC. The maximum adsorption capacity (qmax) was 172.43 mg/g for MAG-OPBC and 83.75 mg/g for OPBC. The adsorption kinetics for both sorbents fitted well with the pseudo-second-order (PSO) model. The results indicate that MAG-OPBC is a promising adsorbent for treating pharmaceutical wastewater.

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Exploring reaction mechanism of CO and H2S on the oxygen defect surface of Ca2Fe2O5 oxygen carrier in chemical looping combustion

Zhang,

Guo

2025

Fuel

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Pressure- and temperature-dependent Raman spectra of Ca2Fe2O5 oxygen defect perovskite

Cited by 5 publications

References 32 publications

In Situ Capture and Conversion of CO₂ to CO Using CaZrO₃ Promoted Fe–CaO Dual-Functional Material

In Situ Capture and Conversion of CO₂ to CO Using CaZrO₃ Promoted Fe–CaO Dual-Functional Material

Performance of Pristine versus Magnetized Orange Peels Biochar Adapted to Adsorptive Removal of Daunorubicin: Eco-Structuring, Kinetics and Equilibrium Studies

Exploring reaction mechanism of CO and H2S on the oxygen defect surface of Ca2Fe2O5 oxygen carrier in chemical looping combustion

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Pressure- and temperature-dependent Raman spectra of Ca2Fe2O5 oxygen defect perovskite

Cited by 5 publications

References 32 publications

In Situ Capture and Conversion of CO2 to CO Using CaZrO3 Promoted Fe–CaO Dual-Functional Material

In Situ Capture and Conversion of CO2 to CO Using CaZrO3 Promoted Fe–CaO Dual-Functional Material

Performance of Pristine versus Magnetized Orange Peels Biochar Adapted to Adsorptive Removal of Daunorubicin: Eco-Structuring, Kinetics and Equilibrium Studies

Exploring reaction mechanism of CO and H2S on the oxygen defect surface of Ca2Fe2O5 oxygen carrier in chemical looping combustion

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Product

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In Situ Capture and Conversion of CO₂ to CO Using CaZrO₃ Promoted Fe–CaO Dual-Functional Material

In Situ Capture and Conversion of CO₂ to CO Using CaZrO₃ Promoted Fe–CaO Dual-Functional Material