Short-range ordered Co(OH)2/TiO2 for boosting sulfite oxidation: Performance and mechanism

Lidong Wang; Zhimo Fang; Tieyue Qi; Lei Xing; Jie Liu; Shihan Zhang; Peiyao Xu; Ping Ning

doi:10.1016/j.jcis.2020.03.042

Short-range ordered Co(OH)₂/TiO₂ for boosting sulfite oxidation: Performance and mechanism

Lidong Wang, Zhimo Fang, Tieyue Qi, Lei Xing, Jie Liu, Shihan Zhang, Peiyao Xu, Ping Ning

Illinois State Geological Survey

Research output: Contribution to journal › Article › peer-review

Abstract

Catalysis of magnesium sulfite (MgSO₃) oxidation is crucial for the flue gas desulfurization by magnesium oxide. Here, a short-range ordered Co(OH)₂/TiO₂ hybrid with a direct Z-scheme band structure, was fabricated for the reaction of MgSO₃ oxidation. The abundant defects of Co(OH)₂/TiO₂ induced the generation of more surface adsorbed oxygen species, and therefore greatly facilitated the formation of the key radical of ^[rad]SO₅ ⁻ to enhance MgSO₃ oxidation. The oxidation rate of MgSO₃ was enhanced 6.1-fold higher than the uncatalyzed benchmark with this neat Co(OH)₂/TiO₂ catalyst. Moreover, the oxidation rate of MgSO₃ could be further improved 11.3-fold by the assistance of light irradiation, which broadened the pathways for MgSO₃ oxidation by inspiring more active radicals (^[rad]O₂ ⁻, ^[rad]OH, SO₄ ^[rad]−, ^[rad]SO₅ ⁻) and photogenerated holes to participate into MgSO₃ oxidation. The photogenerated holes were proved to play key role to accelerate reaction by directly oxidized MgSO₃ or inducing active radicles, and the highly efficient utilization of photogenerated holes was guaranteed by the Z-scheme charge transfer in the Co(OH)₂/TiO₂ interface. The results provided by this study could serve as an environmentally friendly approach to improve the overall performance of wet desulfurization.

Original language	English (US)
Pages (from-to)	90-99
Number of pages	10
Journal	Journal of Colloid And Interface Science
Volume	571
DOIs	https://doi.org/10.1016/j.jcis.2020.03.042
State	Published - Jul 1 2020

Keywords

Co(OH)/TiO hybrid
Desulfurization
Free radicals
Short-range ordered structure
Sulfite oxidation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Surfaces, Coatings and Films
Biomaterials
Colloid and Surface Chemistry

Online availability

10.1016/j.jcis.2020.03.042

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@article{5716a2f1d2154e5182782b4995c6866e,

title = "Short-range ordered Co(OH)2/TiO2 for boosting sulfite oxidation: Performance and mechanism",

abstract = "Catalysis of magnesium sulfite (MgSO3) oxidation is crucial for the flue gas desulfurization by magnesium oxide. Here, a short-range ordered Co(OH)2/TiO2 hybrid with a direct Z-scheme band structure, was fabricated for the reaction of MgSO3 oxidation. The abundant defects of Co(OH)2/TiO2 induced the generation of more surface adsorbed oxygen species, and therefore greatly facilitated the formation of the key radical of [rad]SO5 − to enhance MgSO3 oxidation. The oxidation rate of MgSO3 was enhanced 6.1-fold higher than the uncatalyzed benchmark with this neat Co(OH)2/TiO2 catalyst. Moreover, the oxidation rate of MgSO3 could be further improved 11.3-fold by the assistance of light irradiation, which broadened the pathways for MgSO3 oxidation by inspiring more active radicals ([rad]O2 −, [rad]OH, SO4 [rad]−, [rad]SO5 −) and photogenerated holes to participate into MgSO3 oxidation. The photogenerated holes were proved to play key role to accelerate reaction by directly oxidized MgSO3 or inducing active radicles, and the highly efficient utilization of photogenerated holes was guaranteed by the Z-scheme charge transfer in the Co(OH)2/TiO2 interface. The results provided by this study could serve as an environmentally friendly approach to improve the overall performance of wet desulfurization.",

keywords = "Co(OH)/TiO hybrid, Desulfurization, Free radicals, Short-range ordered structure, Sulfite oxidation",

author = "Lidong Wang and Zhimo Fang and Tieyue Qi and Lei Xing and Jie Liu and Shihan Zhang and Peiyao Xu and Ping Ning",

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year = "2020",

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doi = "10.1016/j.jcis.2020.03.042",

language = "English (US)",

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T1 - Short-range ordered Co(OH)2/TiO2 for boosting sulfite oxidation

T2 - Performance and mechanism

AU - Wang, Lidong

AU - Fang, Zhimo

AU - Qi, Tieyue

AU - Xing, Lei

AU - Liu, Jie

AU - Zhang, Shihan

AU - Xu, Peiyao

AU - Ning, Ping

PY - 2020/7/1

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N2 - Catalysis of magnesium sulfite (MgSO3) oxidation is crucial for the flue gas desulfurization by magnesium oxide. Here, a short-range ordered Co(OH)2/TiO2 hybrid with a direct Z-scheme band structure, was fabricated for the reaction of MgSO3 oxidation. The abundant defects of Co(OH)2/TiO2 induced the generation of more surface adsorbed oxygen species, and therefore greatly facilitated the formation of the key radical of [rad]SO5 − to enhance MgSO3 oxidation. The oxidation rate of MgSO3 was enhanced 6.1-fold higher than the uncatalyzed benchmark with this neat Co(OH)2/TiO2 catalyst. Moreover, the oxidation rate of MgSO3 could be further improved 11.3-fold by the assistance of light irradiation, which broadened the pathways for MgSO3 oxidation by inspiring more active radicals ([rad]O2 −, [rad]OH, SO4 [rad]−, [rad]SO5 −) and photogenerated holes to participate into MgSO3 oxidation. The photogenerated holes were proved to play key role to accelerate reaction by directly oxidized MgSO3 or inducing active radicles, and the highly efficient utilization of photogenerated holes was guaranteed by the Z-scheme charge transfer in the Co(OH)2/TiO2 interface. The results provided by this study could serve as an environmentally friendly approach to improve the overall performance of wet desulfurization.

AB - Catalysis of magnesium sulfite (MgSO3) oxidation is crucial for the flue gas desulfurization by magnesium oxide. Here, a short-range ordered Co(OH)2/TiO2 hybrid with a direct Z-scheme band structure, was fabricated for the reaction of MgSO3 oxidation. The abundant defects of Co(OH)2/TiO2 induced the generation of more surface adsorbed oxygen species, and therefore greatly facilitated the formation of the key radical of [rad]SO5 − to enhance MgSO3 oxidation. The oxidation rate of MgSO3 was enhanced 6.1-fold higher than the uncatalyzed benchmark with this neat Co(OH)2/TiO2 catalyst. Moreover, the oxidation rate of MgSO3 could be further improved 11.3-fold by the assistance of light irradiation, which broadened the pathways for MgSO3 oxidation by inspiring more active radicals ([rad]O2 −, [rad]OH, SO4 [rad]−, [rad]SO5 −) and photogenerated holes to participate into MgSO3 oxidation. The photogenerated holes were proved to play key role to accelerate reaction by directly oxidized MgSO3 or inducing active radicles, and the highly efficient utilization of photogenerated holes was guaranteed by the Z-scheme charge transfer in the Co(OH)2/TiO2 interface. The results provided by this study could serve as an environmentally friendly approach to improve the overall performance of wet desulfurization.

KW - Co(OH)/TiO hybrid

KW - Desulfurization

KW - Free radicals

KW - Short-range ordered structure

KW - Sulfite oxidation

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