Oxygen vacancies promote sulfur species accumulation on TiO2 mineral particles

Shang, Hai; Wang, Xiao; Li, Hao; Li, Meiqi; Mao, Chengliang; Pan, Xing; Zhao, Shengxi; Chen, Ziyue; Sun, Jing; Ai, Zhihui; Zhang, Lizhi

doi:10.1016/j.apcatb.2021.120024

Cited by 30 publications

(11 citation statements)

References 44 publications

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“…That may be due to the increased electrons of the undercoordinated Ti and O sites around OVs. 83 Furthermore, previous theoretical and experimental results 84 suggested that the excessive electrons of the oxygen vacancy contributed to the reaction of oxygen-containing absorbents (such as O 2 or H 2 O) during the photocatalytic process. It was reported that the H 2 O adsorption process included H 2 O molecules approaching and adsorption, as well as decomposition into bridging OH groups on OVs.…”

Section: Dissociative Adsorption Propertiesmentioning

confidence: 99%

A review on TiO_2−x-based materials for photocatalytic CO₂ reduction

Wang

Chen

et al. 2022

Nanoscale

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Section: Dissociative Adsorption Propertiesmentioning

confidence: 99%

A review on TiO_2−x-based materials for photocatalytic CO₂ reduction

Wang

Chen

et al. 2022

Nanoscale

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“…35 Shang et al found that oxygen vacancies on the surface of defective TiO 2 can enhance the heterogeneous reaction of SO 2 , resulting in higher formation of sulfite and sulfate than nondefective TiO 2 . 27 In addition, Yang et al found that acetic acid could compete with SO 2 for active sites on the surface of α-Al 2 O 3 and CaCO 3 , 37 thereby weakening the heterogeneous uptake of SO 2 . These studies revealed that in the real atmospheric environment, the heterogeneous reaction of SO 2 is highly complex, affected by various environmental factors and the coexistence of other gases.…”

Section: Introductionmentioning

confidence: 99%

“…Sulfate is one of the most significant inorganic particles in the atmosphere − and is mainly generated by the oxidation process of SO 2 , including gas-phase oxidation, aqueous-phase oxidation in cloud droplets, and heterogeneous oxidation on particle surfaces. − Rapid sulfate formation has been proven to play a major role in some of the smog events (e.g., London smog and Beijing smog). , Heterogeneous oxidation of SO 2 on water or solid particles is considered to be a potentially significant source of sulfate PM, which can have profound effects on air quality and human health …”

Section: Introductionmentioning

confidence: 99%

Interaction of Acrylic Acid and SO₂ on the Surface of Mineral Dust Aerosol

Tsona

et al. 2023

ACS Earth Space Chem.

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Heterogeneous reactions of ubiquitous acidic gases on the surface of mineral dust particles change particulate acidity and therefore affect the atmosphere, soil, and water environments during long-distance transport. Notwithstanding, interactions of inorganic and organic acidic gases in the heterogeneous reactions with aerosols remain poorly understood. In this study, reactions of sulfur dioxide (SO2) and acrylic acid on the surface of titanium dioxide (TiO2) particles under different conditions are investigated using diffuse reflectance infrared Fourier transform spectroscopy. Our analysis shows that in the single-component experiments with only SO2 or acrylic acid, wet condition inhibits the formation of sulfite compared with the dry condition; light can promote the formation of sulfuric acid and sulfate, but has little effect on the reaction of acrylic acid. In the mixed experiments with both SO2 and acrylic acid, acrylic acid can inhibit the heterogeneous reaction of SO2 by competing Lewis acid sites, Lewis basic sites, and OH active sites on the surface of particles, whereas SO2 has little effect on acrylic acid. When there is light in the mixed experiments, photo-excited reactive oxygen species can facilitate the production of sulfuric acid, which displaces acrylic acid, resulting in a decrease in acrylate and an enhancement in adsorbed acrylic acid. The results reveal the interaction of different acidic gases on the surface of particles and advance the understanding of the heterogeneous reaction of trace gases in complex atmospheric environments.

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“…The photodegradation of SO 2 by TiO 2 has been extensively investigated. − Although the formation of adsorbed products such as sulfate on the TiO 2 surface by photodegradation has been studied extensively, ,, only few studies have investigated the effects of TiO 2 on the formation of gaseous H 2 SO 4 . Dupart et al conducted a flow tube experiment under light conditions and found that metal oxides (Fe 2 O 3 ) in mineral dust can act as atmospheric photocatalysts promoting the formation of OH radicals, which initiate the conversion of SO 2 to H 2 SO 4 and may lead to the occurrence of nucleation.…”

Section: Introductionmentioning

confidence: 99%

Titanium Dioxide Promotes New Particle Formation: A Smog Chamber Study

Zhang

Chu

Liu

et al. 2023

Environ. Sci. Technol.

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TiO2 is a widely used material in building coatings. Many studies have revealed that TiO2 promotes the heterogeneous oxidation of SO2 and the subsequent sulfate formation. However, whether and how much TiO2 contributes to the gaseous H2SO4 and subsequent new particle formation (NPF) still remains unclear. Herein, we used a 1 m3 quartz smog chamber to investigate NPF in the presence of TiO2. The experimental results indicated that TiO2 could greatly promote NPF. The increases in particle formation rate (J) and growth rate due to the presence of TiO2 were quantified, and the promotion effect was attributed to the production of gaseous H2SO4. The promotion effect of TiO2 on SO2 oxidation and subsequent NPF decreased gradually due to the formation of surface sulfate but did not disappear completely, instead partly recovering after washing with water. Moreover, the promotion effect of TiO2 on NPF was observed regardless of differences in RH, and the most significant promotion effect of TiO2 associated with the strongest NPF occurred at an RH of 20%. Based on the experimental evidence, the environmental impact of TiO2 on gaseous H2SO4 and particle pollution in urban areas was estimated.

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Oxygen vacancies promote sulfur species accumulation on TiO2 mineral particles

Cited by 30 publications

References 44 publications

A review on TiO_2−x-based materials for photocatalytic CO₂ reduction

A review on TiO_2−x-based materials for photocatalytic CO₂ reduction

Interaction of Acrylic Acid and SO₂ on the Surface of Mineral Dust Aerosol

Titanium Dioxide Promotes New Particle Formation: A Smog Chamber Study

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Oxygen vacancies promote sulfur species accumulation on TiO2 mineral particles

Cited by 30 publications

References 44 publications

A review on TiO2−x-based materials for photocatalytic CO2 reduction

A review on TiO2−x-based materials for photocatalytic CO2 reduction

Interaction of Acrylic Acid and SO2 on the Surface of Mineral Dust Aerosol

Titanium Dioxide Promotes New Particle Formation: A Smog Chamber Study

Contact Info

Product

Resources

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A review on TiO_2−x-based materials for photocatalytic CO₂ reduction

A review on TiO_2−x-based materials for photocatalytic CO₂ reduction

Interaction of Acrylic Acid and SO₂ on the Surface of Mineral Dust Aerosol