Bi12TiO20-TiO2 S-scheme heterojunction for improved photocatalytic NO removal: Experimental and DFT insights

Liu, Hongxia; Pan, Longkai; Nie, Junli; Zhu, Gangqiang; Jin, Zhipeng; Cheng, Laifei; Zhang, Litong

doi:10.1016/j.seppur.2023.123575

Cited by 26 publications

(4 citation statements)

References 39 publications

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“…Ce 2 S 3 exhibited a higher Fermi level compared to TiO 2 , implying a propensity for electron flow from Ce 2 S 3 to TiO 2 until Fermi level alignment is achieved, facilitating the hybridization of TiO 2 with Ce 2 S 3 (Figure ). This electron transfer from Ce 2 S 3 to TiO 2 , in turn, results in energy band bending near the interface and establishes a built IEF from Ce 2 S 3 to TiO 2 . The electron transfer mechanism in this S-scheme heterojunction effectively elucidates the subsequent processes.…”

Section: Resultsmentioning

confidence: 99%

Harnessing the Synergistic Power of Ce₂S₃/TiO₂ S-Scheme Heterojunctions for Profound C–O Bond Cleavage in Lignin Model Compounds

Liao,

Zhou,

Chen

et al. 2024

ACS Catal.

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In the context of achieving carbon neutrality, converting lignin-derived molecules into high-value products through photocatalytic technology provides an environmentally friendly pathway. Establishing energy-efficient processes for converting lignin derivatives requires the construction of highly active and selective photocatalysts. However, enhancing the efficiency and selectivity of photocatalysts for lignin degradation poses an ongoing challenge due to discrepancies in the redox potential and the rapid recombination of photogenerated carriers. To address these significant obstacles, we devised an innovative strategy by developing a Ce 2 S 3 nanoparticle-anchored TiO 2 nanorod (Ce 2 S 3 /TiO 2 ). This advanced photocatalyst with the S-scheme heterojunction, enabling simultaneous control of carrier dynamics and band structure, was used to study the photocatalytic degradation of the lignin model compound 2phenoxy-1-acetophenone. Moreover, the photocatalyst can cleave the C β -O-4 bond selectively to convert the lignin model compound 2-phenoxy-1-acetophenone into phenol and acetophenone under visiblelight irradiation. The yields are up to 94 and 80%, respectively, and 94 or 1.4 times greater than those obtained by pure TiO 2 or Ce 2 S 3 individually. In addition, our study for the increased activity in Ce 2 S 3 /TiO 2 based on density functional theory calculations emphasizes the pivotal role of the S-scheme heterojunction generated between Ce 2 S 3 and TiO 2 . This heterojunction significantly enhances carrier separation efficiency, thereby augmenting the efficacy of the photocatalytic process. The findings furnish valuable insights for developing advanced photocatalytic systems tailored to the efficient depolymerization of C β -O-4 bonds in lignin.

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Section: Resultsmentioning

confidence: 99%

Harnessing the Synergistic Power of Ce₂S₃/TiO₂ S-Scheme Heterojunctions for Profound C–O Bond Cleavage in Lignin Model Compounds

Liao,

Zhou,

Chen

et al. 2024

ACS Catal.

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“…[13,19,20] The optimized O 2 and NO geometries are presented in Figure 1, demonstrating bond lengths consistent with the values in literature. [21,22] Therefore, the calculation parameters employed in this study were deemed reliable.…”

Section: Dft Calculationmentioning

confidence: 97%

Ozone oxidation of nitric oxide: Promoting effect of phosphorus and inhibitory effect of phosphoric acid

Yang,

Tian,

Ning

et al. 2024

Can J Chem Eng

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This work presents experimental and density functional theory theoretical methods to carry out the catalytic role and reaction mechanism of phosphorus (P4) for liquid phase catalytic oxidation nitric oxide. Meanwhile, it carries out the promoting effect of phosphorus and inhibitory effect of phosphoric acid in the ozone oxidation of nitric oxide. The work reveals the significant involvement of P4 in facilitating the NO catalytic oxidation process by generating O3. Meanwhile, the presence of phosphoric acid (H3PO4) hindered the NO catalytic removal process. The calculation results highlight that P4 promoted the formation of O3 and favoured the oxidation pathway (oxidation‐hydration, NO ➔ NO2 ➔ HNO3). During the liquid‐phase NO catalytic removal process, O2 and NO dissolved into the solution, where O2 exhibited preferential adsorbed on P4, promoting the O3 formation. Subsequently, O3 first oxidized NO to NO2. Then, HNO2 and HNO3 were generated under the hydration reaction of NO2 and H2O. Next, O3 further oxidized the generated HNO2 to HNO3, realizing the complete oxidation of NO. The hydration step of NO2 was identified as the key step in the O3 oxidation processes. Furthermore, the generation of H3PO4 led to the consumption of P4 and inhibited the NO removal process. O3 played the crucial role in liquid phase NO oxidation.

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“…The World Health Organization (WHO) recommends a healthy indoor NO x level of 150 µg m −3 (European limit, 40 µg m −3 [21 ppb]) [9,10]. Over the years, NO x removal strategies have been adopted, such as physical adsorption, wet oxidation, chemisorption, biological filtration, thermo-catalytic reduction, photocatalysis, selective catalytic processes, and selective noncatalytic processes [11,12]. The selective catalytic reduction (SCR) process is employed to mitigate high concentrations of NO x emissions from industrial boilers, typically operating at temperatures of 250 • C or higher, by utilizing NH 3 as a scrubber solution.…”

Section: Introductionmentioning

confidence: 99%

Materials Design and Development of Photocatalytic NOx Removal Technology

Bari,

Islam,

Jeong

2024

Metals

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Nitrogen oxide (NOx) pollutants have a significant impact on both the environment and human health. Photocatalytic NOx removal offers a sustainable and eco-friendly approach to combatting these pollutants by harnessing renewable solar energy. Photocatalysis demonstrates remarkable efficiency in removing NOx at sub-scale levels of parts per billion (ppb). The effectiveness of these catalysts depends on various factors, including solar light utilization efficiency, charge separation performance, reactive species adsorption, and catalytic reaction pathway selectivity. Moreover, achieving high stability and efficient photocatalytic activity necessitates a multifaceted materials design strategy. This strategy encompasses techniques such as ion doping, defects engineering, morphology control, heterojunction construction, and metal decoration on metal- or metal oxide-based photocatalysts. To optimize photocatalytic processes, adjustments to band structures, optimization of surface physiochemical states, and implementation of built-in electric field approaches are imperative. By addressing these challenges, researchers aim to develop efficient and stable photocatalysts, thus contributing to the advancement of environmentally friendly NOx removal technologies. This review highlights recent advancements in photocatalytic NOx removal, with a focus on materials design strategies, intrinsic properties, fundamental developmental aspects, and performance validation. This review also presents research gaps, emphasizing the need to understand the comprehensive mechanistic photocatalytic process, favored conditions for generating desired reactive species, the role of water concentration, temperature effects, inhibiting strategies for photocatalyst-deactivating species, and the formation of toxic NO2.

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Bi12TiO20-TiO2 S-scheme heterojunction for improved photocatalytic NO removal: Experimental and DFT insights

Cited by 26 publications

References 39 publications

Harnessing the Synergistic Power of Ce₂S₃/TiO₂ S-Scheme Heterojunctions for Profound C–O Bond Cleavage in Lignin Model Compounds

Harnessing the Synergistic Power of Ce₂S₃/TiO₂ S-Scheme Heterojunctions for Profound C–O Bond Cleavage in Lignin Model Compounds

Ozone oxidation of nitric oxide: Promoting effect of phosphorus and inhibitory effect of phosphoric acid

Materials Design and Development of Photocatalytic NOx Removal Technology

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Bi12TiO20-TiO2 S-scheme heterojunction for improved photocatalytic NO removal: Experimental and DFT insights

Cited by 26 publications

References 39 publications

Harnessing the Synergistic Power of Ce2S3/TiO2 S-Scheme Heterojunctions for Profound C–O Bond Cleavage in Lignin Model Compounds

Harnessing the Synergistic Power of Ce2S3/TiO2 S-Scheme Heterojunctions for Profound C–O Bond Cleavage in Lignin Model Compounds

Ozone oxidation of nitric oxide: Promoting effect of phosphorus and inhibitory effect of phosphoric acid

Materials Design and Development of Photocatalytic NOx Removal Technology

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Harnessing the Synergistic Power of Ce₂S₃/TiO₂ S-Scheme Heterojunctions for Profound C–O Bond Cleavage in Lignin Model Compounds

Harnessing the Synergistic Power of Ce₂S₃/TiO₂ S-Scheme Heterojunctions for Profound C–O Bond Cleavage in Lignin Model Compounds