Graphene quantum dots/NiTi layered double hydroxide heterojunction as a highly efficient De-NOx photocatalyst with long persistent post-illumination action

Fragoso, Javier; Pastor, Adrián; Cruz-Yusta, Manuel; Jiménez, Francisco Martín; Miguel, Gustavo de; Pavlović, I.; Sánchez, M.; Sánchez, L.

doi:10.1016/j.apcatb.2022.122115

Cited by 30 publications

(14 citation statements)

References 73 publications

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“…60 In 2021, they used urea to prepare g-C 3 N 4 , and then attached it to Sr 2 MgSi 2 O 7 :(Eu, Dy) with different mass ratios to obtain composites. 56 The photocatalytic performance of the coupled g-C 3 N 4 with Sr 2 MgSi 2 O 7 :(Eu, Dy) was veried by the removal NO as a pollutant, and the highest NO removal efficiency was 70.73% with a mass ratio of 2 : 1, and the composite not only had the best removal efficiency of NO under a light source, but also exhibited the highest removal effect aer light irradiation was off. In the following year, they prepared a light-storing photocatalytic composite using melamine and g-C In their studies, they constructed a novel system of lightstoring-assisted photocatalytic composite, which coupled a long aerglow material and photocatalyst, and the photocatalytic performance of the photocatalytic composite is due to the synergistic effects between the electric eld and energy band offsets.…”

Section: Removal Of Nomentioning

confidence: 99%

“…However, they have several disadvantages, limiting their large-scale applications such as high temperature and high concentration. In survey of the curve of NO x content with time during the day, 56 the changing trends of NO x content showed that the NO x concentration decreased in the daylight and steeply rise from 19–24 h. This suggests that sunlight helps in the photocatalytic removal of NO x , and the necessity of developing photocatalysts has increased with the aim to degrade NO x . Air pollutants can be decomposed by photocatalytic reaction with the assistance of illuminants, and consequently a suitable excitation light is an essential part to stimulate the photocatalytic process.…”

Section: Applicationmentioning

confidence: 99%

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A brief review: the application of long afterglow luminescent materials in environmental remediation

et al. 2023

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Section: Removal Of Nomentioning

confidence: 99%

Section: Applicationmentioning

confidence: 99%

A brief review: the application of long afterglow luminescent materials in environmental remediation

et al. 2023

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“…24,25 Conversely, no changes in the chemical state were detected in the used NiTi-LDH, signifying its superior stability (Figures S6 and S7). 26,27 28,29 The ratios of hydroxyl groups on MgAl-LDH and NiAl-LDH catalysts are 83.9% and 80.3% before HCHO oxidation, respectively. Although the ratio of hydroxyl groups on the surface of NiTi-LDH catalyst (82.0%) is not the highest, the change in hydroxyl groups before and after the reaction indicates that the hydroxyl groups on the surface of NiTi-LDH catalyst are evidently involved in the oxidation of formaldehyde.…”

Section: Catalytic Oxidation Of Hchomentioning

confidence: 99%

Efficient and Durable Oxidation Removal of Formaldehyde over Layered Double Hydroxide Catalysts at Room Temperature

Chen,

Li,

Xue

et al. 2024

Environ. Sci. Technol.

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Room temperature catalytic oxidation (RTCO) using non-noble metals has emerged as a highly promising technique for removal of formaldehyde (HCHO) under ambient conditions; however, non-noble catalysts still face the challenges related to poor water resistance and low stability under harsh conditions. In this study, we synthesized a series of layered double hydroxides (LDHs) incorporating various dual metals (MgAl, ZnAl, NiAl, NiFe, and NiTi) for formaldehyde oxidation at ambient temperature. Among the synthesized catalysts, the NiTi-LDH catalyst showed an HCHO removal efficiency and CO 2 yield close to 100.0%, and exceptional water resistance and chemical stability on running 1300 min. The abundant hydroxyl groups in LDHs directly bonded with HCHO, leading to the production of CO 2 and H 2 O, thus inhibiting the formation of CO, even in the absence of O 2 and H 2 O. The coexistence of O 2 effectively reduced the reaction barrier for H 2 O molecule dissociation, facilitating the formation of hydroxyl groups and their subsequent backfill on the catalyst surface. The mechanisms underlying the involvement and regeneration of hydroxyl groups in room temperature oxidation of formaldehyde were elucidated with the combined in situ DRIFTS, HCHO-TPD-MS, and DFT calculations. This work not only demonstrates the potential of LDH catalysts in environmental applications but also advances the understanding of the fundamental processes involved in room temperature oxidation of formaldehyde.

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“…The absorption intensity was negatively correlated with laurate content, which means less laurate would be beneficial to improve the light absorption capacity of the LDH. The band gaps of Ni/Cr(2/1)−xLA LDHs are determined by Equation (1) [35]:…”

Section: Photochemical Propertiesmentioning

confidence: 99%

Intercalated-Laurate-Enhanced Photocatalytic Activities of Ni/Cr-Layered Double Hydroxides

et al. 2023

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Laurate (LA−)-intercalated nickel–chromium-layered double hydroxides (LDHs) were synthesized using the co-precipitation method and investigated as a potential photocatalyst for methylene orange (MO) degradation. For comparison, a series of LDHs with various molar ratios of Ni2+(or Mg2+)/Cr3+(or Fe3+)/LA−(or CO32−) were prepared. X−ray diffraction (XRD) and element analysis showed that Ni/Cr(2/1)−1.0 LA LDH had the most ordered crystal structure, and showed the same photocatalytic decolorization performance as Mg/Cr(2/1)−1.0LA LDH towards MO, which was significantly superior to Ni/Cr−CO3 LDH, Ni/Fe(2/1)−1.0LA LDH, and Ni/Cr−CO3 LDH with LA−, and Cr3+ with LA−. The photocatalytic removal rate of MO with the initial concentration of 100 mg/L by Ni/Cr(2/1)−1.0LA LDH (0.5 g/L) could be up to 80% with UV light irradiation for 3 h, which was almost twice higher than that of the sorption test. The photocatalytic reaction was in accordance with the pseudo-first-order kinetics, which implied that the catalytic process took place on the surface of the catalyst. All the results indicate the photodegradation of MO by Ni/Cr−LA LDHs was enhanced by the sorption of MO onto the intercalated LA− in the interlayer. The free radical capture experiments suggest that the main role of the photocatalytic mechanism of Ni/Cr−LA LDHs could be the •O2− with high oxidation activity produced by the electron-hole pairs of LDH, as excited by UV light. Additionally, the •O2− further reacted with the adjacent MO molecule pre-sorbed on the intercalated LA.

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Graphene quantum dots/NiTi layered double hydroxide heterojunction as a highly efficient De-NOx photocatalyst with long persistent post-illumination action

Cited by 30 publications

References 73 publications

A brief review: the application of long afterglow luminescent materials in environmental remediation

A brief review: the application of long afterglow luminescent materials in environmental remediation

Efficient and Durable Oxidation Removal of Formaldehyde over Layered Double Hydroxide Catalysts at Room Temperature

Intercalated-Laurate-Enhanced Photocatalytic Activities of Ni/Cr-Layered Double Hydroxides

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