Effect of coloured TiO
            <sub>2</sub>
            with different oxygen vacancy concentrations on the photocatalytic oxidation of gaseous mercury

Xu, Wei; Liu, Zhiqiang; Zhang, Ruitao; Ma, Xiaoxun; Lei, Zhenxin; Shi, Minmin; Zhu, Jing; Cheng, Zhihai; Wu, Jiang; Qi, Yongfeng

doi:10.1080/03067319.2022.2089035

Cited by 1 publication

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“…9 Besides, the oxygen vacancy defects play a promotional role in the processes of oxygen evolution reaction (OER), 10 catalytic reaction, 11−13 adsorption, 14 electron transfer, 15 mineral microbial reduction, 16 and heavy metal pollution remediation. 17 When Fe 2+ in magnetite (Fe 3 O 4 ) is completely oxidized to Fe 3+ , maghemite (γ-Fe 2 O 3 ) is formed. Then, the octahedral position occupied by 1/3 Fe 2+ produces vacancies, but not vacancy defects.…”

Section: Introductionmentioning

confidence: 99%

“…Hematite with more oxygen vacancy (OV) defects promotes the immobilization of arsenate and shows greater adsorption strength . Besides, the oxygen vacancy defects play a promotional role in the processes of oxygen evolution reaction (OER), catalytic reaction, − adsorption, electron transfer, mineral microbial reduction, and heavy metal pollution remediation . When Fe 2+ in magnetite (Fe 3 O 4 ) is completely oxidized to Fe 3+ , maghemite (γ-Fe 2 O 3 ) is formed.…”

Section: Introductionmentioning

confidence: 99%

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Promoting the Mechanism of Oxygen Vacancy-Enriched γ-Fe₂O₃ Nanorods on the Immobilization of Gaseous Arsenic in Stimulated Flue Gas

Ma,

Yang,

Yuan

et al. 2024

Energy Fuels

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Iron-bearing minerals have been reported to be sinks for arsenic, and oxygen vacancies in α-Fe 2 O 3 can reduce the bioavailability of arsenic in soil and sediments and further contribute to arsenic immobilization. The mechanism of oxygen vacancies to promote gaseous arsenic immobilization by γ-Fe 2 O 3 during coal combustion remains to be comprehensively investigated. The oxygen vacancy-enriched γ-Fe 2 O 3 nanorod (O van γ-Fe 2 O 3 ) was synthesized by regulating the synthesis conditions through NaBH 4 reduction reaction and low-temperature calcination of lepidocrocite. The synthesized O van γ-Fe 2 O 3 was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and it showed excellent gaseous As 2 O 3 immobilization capacity (9.14 mg/g at 600 °C and 12.76 mg/g at 900 °C), much higher than the commercial γ-Fe 2 O 3 under the stimulated flue gas (SFG) conditions. This sorbent also endured long-term gaseous As 2 O 3 adsorption without penetration at 600 °C for 2 h (47.70 mg/g). Electron spin resonance (ESR) spectra proved that there were more oxygen vacancies (OVs) on O van γ-Fe 2 O 3 than on the commercial γ-Fe 2 O 3 , which provided more arsenic immobilization sites, and it generated more extra OVs under 600 °C SFG. X-ray photoelectron spectroscopy (XPS) demonstrated that the immobilized arsenic compounds on the surface of the γ-Fe 2 O 3 were transformed from As(III) to As(V), indicating that the oxygen vacancies promoted the oxidation of As 2 O 3 to As 2 O 5 with lower toxicity. The O van γ-Fe 2 O 3 performed a strong thermal stability, long time endurance, and excellent immobilization capacity, making it a promising candidate for industrial use in high temperature flue gas.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Promoting the Mechanism of Oxygen Vacancy-Enriched γ-Fe₂O₃ Nanorods on the Immobilization of Gaseous Arsenic in Stimulated Flue Gas

Ma,

Yang,

Yuan

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

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Effect of coloured TiO ₂ with different oxygen vacancy concentrations on the photocatalytic oxidation of gaseous mercury

Cited by 1 publication

References 15 publications

Promoting the Mechanism of Oxygen Vacancy-Enriched γ-Fe₂O₃ Nanorods on the Immobilization of Gaseous Arsenic in Stimulated Flue Gas

Promoting the Mechanism of Oxygen Vacancy-Enriched γ-Fe₂O₃ Nanorods on the Immobilization of Gaseous Arsenic in Stimulated Flue Gas

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Effect of coloured TiO 2 with different oxygen vacancy concentrations on the photocatalytic oxidation of gaseous mercury

Cited by 1 publication

References 15 publications

Promoting the Mechanism of Oxygen Vacancy-Enriched γ-Fe2O3 Nanorods on the Immobilization of Gaseous Arsenic in Stimulated Flue Gas

Promoting the Mechanism of Oxygen Vacancy-Enriched γ-Fe2O3 Nanorods on the Immobilization of Gaseous Arsenic in Stimulated Flue Gas

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Product

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Effect of coloured TiO ₂ with different oxygen vacancy concentrations on the photocatalytic oxidation of gaseous mercury

Promoting the Mechanism of Oxygen Vacancy-Enriched γ-Fe₂O₃ Nanorods on the Immobilization of Gaseous Arsenic in Stimulated Flue Gas

Promoting the Mechanism of Oxygen Vacancy-Enriched γ-Fe₂O₃ Nanorods on the Immobilization of Gaseous Arsenic in Stimulated Flue Gas