Catalysts for highly water-resistant catalytic decomposition of ozone: Hausmannite Mn3O4 on exposed (101) crystal surface

Shi, Yunfeng; Qiu, Jing; Xue, Yu; Ding, Xinmei; Dai, Jingyu; Sun, Xueliang; Zhao, Ming; Wang, Jianli; Chen, Yaoqiang

doi:10.1016/j.jhazmat.2023.131947

Cited by 11 publications

(3 citation statements)

References 39 publications

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“…Figure 6c depicts a sharp characteristic peak at approximately 633 cm −1 for MnFe-3, which was attributed to the A 1g mode corresponding to the breathing vibration of the Mn−O bond in the tetrahedral coordination Mn 2+ of spinel Mn 3 O 4 . 52 The Raman spectra of MnFe-0 exhibited peaks at 215, 275, 393, 585, and 713 cm −1 , which were assigned to the A 1g mode, E g mode, and α-Fe 2 O 3 phase, respectively. 53 Notably, two Raman modes of the MnFe-1 catalyst were detected at 212 and 269 cm −1 , attributable to F 2g (1) and E g .…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…Raman spectra were obtained to explore the local structure and the oxygen defects. Figure c depicts a sharp characteristic peak at approximately 633 cm –1 for MnFe-3, which was attributed to the A 1g mode corresponding to the breathing vibration of the Mn–O bond in the tetrahedral coordination Mn 2+ of spinel Mn 3 O 4 . The Raman spectra of MnFe-0 exhibited peaks at 215, 275, 393, 585, and 713 cm –1 , which were assigned to the A 1g mode, E g mode, and α-Fe 2 O 3 phase, respectively .…”

Section: Resultsmentioning

confidence: 98%

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Spinel (Mn, Fe)₃O₄ Nanocatalyst for the Catalytic Ozone Decomposition under Humid Conditions

Fu,

Zhong,

et al. 2024

ACS Appl. Nano Mater.

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The development of ozone-decomposition catalysts with high efficiency and exceptional resistance to humidity is a significant challenge, as ozone is a primary air pollutant. This study successfully synthesized a series of Mn x Fe 3−x O 4 catalysts with varying crystal structures by adjusting the Mn/Fe molar ratios through a coprecipitation method with inorganic salt precursors. Compared to crystalline Mn 3 O 4 and Fe 2 O 3 , the obtained amorphous MnFe 2 O 4 (MnFe-1) nanocatalyst exhibited an optimal ozone conversion rate of 99.9% for 50 ppm O 3 with a space velocity (SV) of 600 L g −1 h −1 in dry gas and 77.4% for 50 ppm O 3 with a SV of 600 L g −1 h −1 under a relative humidity (RH) of 60%. The superior performance of the amorphous sample can be attributed not only to its smaller size and larger surface area but also to the presence of Mn 3+ as the active site, a higher number of oxygen vacancies and acid sites, and the synergistic effect between iron and manganese. This research offers a universally applicable preparation method for nanosized spinel oxides and provides an indepth exploration of the ozone-decomposition mechanism.

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Section: ■ Results and Discussionmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 98%

Spinel (Mn, Fe)₃O₄ Nanocatalyst for the Catalytic Ozone Decomposition under Humid Conditions

Fu,

Zhong,

et al. 2024

ACS Appl. Nano Mater.

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“…16 In addition, due to the vast gas accessibility induced by point defects, Mn 3 O 4 has high O 3 adsorption capacity and thus is an excellent material for O 3 gas-sensing. 17,18 Conventional gas sensors based on Mn 3 O 4 usually operate at high temperatures (>150 °C) so the longterm stability is still a challenge. 16 Ultraviolet (UV)-irradiation provides additional energy for thermal annealing or photoactivation.…”

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confidence: 99%

Effect of Ultraviolet Light on Mn₃O₄ Thin Films that are Grown Using SILAR for Room-Temperature Ozone Gas Sensors

Huang,

Chou,

Yang

et al. 2023

J. Electrochem. Soc.

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Successive ionic layer adsorption and reaction (SILAR) is a promising technique to fabricate gas sensors at room temperature. However, the quality of the films is poor, leading to reduced surface area and increased defects within the film structure, thus decreasing the overall gas response. Inferior film quality also negatively affects the stability and reproducibility of the gas sensors over time. This study determines the effect of UV treatment on the structural, morphological, and ozone (O3) gas-sensing properties of p-type Mn3O4 thin films. As UV treatment time increases, the O3 gas-sensing characteristics increase because a porous structure with a higher surface area is formed and electrical conductivity is increased. Under a UV intensity of 20 mW cm−2, the Mn3O4 sensor exhibits gas response, response time, and recovery time of 1.62, 58, and 39 s, respectively, against 5 ppm concentration of O3 gas. Moreover, the Mn3O4 gas sensor exhibits excellent long-term stability showing around 3% variation in gas response over 60 days. This strategy allows the deposition of high-quality p-type Mn3O4 thin films using SILAR for applications in flexible gas sensors.

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Heat-Assisted Visible Light Catalytic PMS for Diclofenac Degradation: Mn-Doped g-C3N4 Catalysts and Synergistic Catalytic Mechanism

Yuan,

Wang,

Fan

et al. 2024

Catal Lett

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Catalysts for highly water-resistant catalytic decomposition of ozone: Hausmannite Mn3O4 on exposed (101) crystal surface

Cited by 11 publications

References 39 publications

Spinel (Mn, Fe)₃O₄ Nanocatalyst for the Catalytic Ozone Decomposition under Humid Conditions

Spinel (Mn, Fe)₃O₄ Nanocatalyst for the Catalytic Ozone Decomposition under Humid Conditions

Effect of Ultraviolet Light on Mn₃O₄ Thin Films that are Grown Using SILAR for Room-Temperature Ozone Gas Sensors

Heat-Assisted Visible Light Catalytic PMS for Diclofenac Degradation: Mn-Doped g-C3N4 Catalysts and Synergistic Catalytic Mechanism

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Catalysts for highly water-resistant catalytic decomposition of ozone: Hausmannite Mn3O4 on exposed (101) crystal surface

Cited by 11 publications

References 39 publications

Spinel (Mn, Fe)3O4 Nanocatalyst for the Catalytic Ozone Decomposition under Humid Conditions

Spinel (Mn, Fe)3O4 Nanocatalyst for the Catalytic Ozone Decomposition under Humid Conditions

Effect of Ultraviolet Light on Mn3O4 Thin Films that are Grown Using SILAR for Room-Temperature Ozone Gas Sensors

Heat-Assisted Visible Light Catalytic PMS for Diclofenac Degradation: Mn-Doped g-C3N4 Catalysts and Synergistic Catalytic Mechanism

Contact Info

Product

Resources

About

Spinel (Mn, Fe)₃O₄ Nanocatalyst for the Catalytic Ozone Decomposition under Humid Conditions

Spinel (Mn, Fe)₃O₄ Nanocatalyst for the Catalytic Ozone Decomposition under Humid Conditions

Effect of Ultraviolet Light on Mn₃O₄ Thin Films that are Grown Using SILAR for Room-Temperature Ozone Gas Sensors