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Summary: Bi12GeO20-based composites Bi12GeO20-Bi2S3 (BGS) were constructed through ball-milling method using sulfur powder for the first time. These composites showed enhanced photocatalytic removal of NO at ppb level under visible light with high selectivity for NO2-/NO3- species, avoiding the generation of toxic NO2. The in-situ generation of n-p heterojunctions with surface OVs and the enhanced visible-light absorption were crucial factors in the improved performance of the BGS composites.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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Summary: In this study, Pd/ferroelectric Bi4Ti3O12 nanoflakes were constructed to investigate the mechanisms of photo-excited charge separation and O2 activation in NOx removal. Results showed that the ferroelectric BTO NF significantly promoted bulk charge separation and led to boosted NO removal kinetics compared to traditional Pd/TiO2 photocatalysts. Different metal/ferroelectric interfaces were found to generate varying O2 activation species, resulting in notable changes in selectivity in environmental remediation reactions.
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Asif Hayat et al.
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JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
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Zhaoling Li et al.
Summary: In this study, a SrCO3/SrTiO3 catalyst was prepared via in-situ synthesis of SrCO3 on the surface of SrTiO3 nanosheets by the hydrothermal method. The catalyst exhibited high selectivity and activity in photocatalytic CO2-to-CO reduction, with a production rate of 23.82 μmol g(-1) h(-1). The distinguished performance and selectivity were attributed to the adsorption energy of CO, surface oxygen vacancies, and the heterojunction structure of SCO/STO, which enhanced charge separation and improved photocatalytic activities.
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Lin Yang et al.
Summary: In this study, Ag/Ag2O loaded on SrSn(OH)6 nanowires promotes interfacial charge-transfer transition, leading to enhanced NO removal under visible light. Excited electrons in the VB of Ag2O enter the CB under visible light, reacting with Ag to produce superoxide radicals, allowing holes in the VB of SSOH to oxidize hydroxyl groups into hydroxyl radicals.
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(2021)
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Fei Rao et al.
Summary: The study proposes a N-2-assisted thermal treatment method for in-situ formation of oxygen vacancies (OVs)-rich Bi-0/Bi-based photocatalysts, clarifying the mechanisms of Bi-0 nanoparticles synthesis and OVs generation. Among the synthesized photocatalysts, Bi-0/OVs-(BiO)2CO3 exhibits the best photocatalytic activity and stability for NO photo-oxidative removal, with the mechanism showing the importance of center dot O-2(-) and center dot OH species in the process.
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Tong Liu et al.
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Ting Shen et al.
Summary: The Mn3O4/BiOCl heterojunction photocatalyst shows excellent performance in removing NO under simulated solar light irradiation, with stable optical properties and morphology. Mn3O4 acts as an electron acceptor to promote photogenerated carrier separation and increase surface oxygen vacancies, which are key factors in NO photocatalytic removal.
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Benjun Huo et al.
Summary: The study successfully synthesized FAPbBr(3)/A-SiO2 nanocomposites photocatalyst, which showed significantly enhanced visible-light-driven NO removal activity compared to pristine FAPbBr(3). The increased active sites and efficient charge carrier separation contribute to the absorption and activation of reactant molecules, opening new possibilities for improving the photocatalytic ability of perovskite quantum dots.
CHEMICAL ENGINEERING JOURNAL
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Tingting Cheng et al.
Summary: This study reports the morphology tailoring of hierarchical Bi4Ti3O12 architectures using tert-butylamine (TB) and oleic acid (OA), revealing the significant influence of TB and OA content on the resulting morphologies. Photodegradation experiments showed that the nanosheet-assembled hierarchical microrods exhibited superior activity in degrading dye wastewater. Interestingly, the photodegradation process of mixed dye solutions differed from that of individual dye solutions, indicating a complex photodegradation mechanism of Bi4Ti3O12 photocatalysts.
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Chenyu Zhu et al.
Summary: In this study, a black TiO2-GO composite with high activity towards photocatalytic NO removal was synthesized using a simple hydrothermal method. The experimental results indicated that the TiO2-GO nanocomposite photocatalyst has high absorption ability and good charge carrier mobility, enhancing its photocatalytic activity. The synergy between H2O2, oxygen vacancies, and GO was also observed in the composite, providing insight into the photocatalytic mechanism.
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Miaoli Gu et al.
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Guimei Liu et al.
Summary: The study demonstrated the use of carbon defects to stabilize single-atom Pd, resulting in preferential separation and transportation of photo-generated charge carriers. This improved design effectively enhances photocatalytic activity.
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Zhanyong Gu et al.
Summary: In this study, a reductant-free strategy was developed to fabricate oxygen vacancies-mediated TiO2 nanocrystals. The organic carbon-doping was found to be conducive to the formation of oxygen vacancies, and the resulting nanocrystals showed outstanding photocatalytic performance.
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Junli Nie et al.
Summary: The flower-like beta-Bi2O3/CeO2-delta p-n heterojunction photocatalyst exhibits enhanced photocatalytic activity for deep NO removal and suppressed NO2 generation under visible light irradiation, attributed to synergistic effects of oxygen vacancies and p-n heterojunction. This work demonstrates a straightforward approach for constructing p-n heterojunction photocatalysts with improved activity and stability for NO removal.
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Lina Lin et al.
Summary: The size of Au particles has a significant impact on the photocatalytic performance, mainly affecting the electron transfer mechanism and interface microstructure. The overall photoelectric properties of samples are determined by size effect, but the number and transport behavior of carriers at the interface fundamentally affect the photocatalytic performance.
CHEMICAL PHYSICS LETTERS
(2021)
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Chemistry, Physical
Hao Ma et al.
Summary: This study synthesized ultrathin Bi2MoO6 nanosheets modified by MoO3 clusters through a surfactant-assisted one step hydrothermal process, showing highly efficient photocatalytic performance for NO removal under relative humidity from 25% to 100% due to the synergistic strategy of ultrathin structure and clusters. The surface clusters create a new electron migration pathway, greatly enhancing the interfacial charge transfer efficiency.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
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Engineering, Environmental
Yunpei Cui et al.
Summary: Composite materials (GQDs/BWO) were prepared by combining graphene quantum dots (GQDs) with bismuth tungstate (Bi2WO6) to enhance photocatalytic degradation of nitric oxide. The introduction of GQDs in the composite catalyst significantly improved the photocatalytic performance, attributed to enhanced electron-hole separation efficiency and inhibition of recombination, resulting from increased surface area and light absorption.
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Hongxia Liu et al.
Summary: Tailoring semiconductors with non-precious metals or defects has shown promise for environmental remediation. In this study, Bi metal and oxygen vacancies (OVs) comodified Bi12TiO20 nanofibers (Bi/BTO) photocatalysts were synthesized, exhibiting higher photocatalytic NO removal activity under visible light. The presence of OVs and the surface plasmon resonance (SPR) effect of Bi particles contribute to the improved photocatalytic performance, as confirmed by X-ray photoelectron spectroscopy and electron paramagnetic resonance spectroscopy.
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