A facile approach to enhancing the UV blocking properties of layered double hydroxides and potential application in asphalt

Xu, Enze; Chen, P.; Wang, G.; Li, K.; Lin, Yanjun

doi:10.1016/j.mtsust.2021.100081

Cited by 5 publications

(6 citation statements)

References 30 publications

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“…Based on the consequence of inductively coupled plasma atomic emission spectrometry (ICP-AES, Table S1), the concentration of Pt species is close to the theoretical content. As shown in the scanning electron microscopy (SEM) images (Figure b–e), the morphology of CoAlO x (Figure c), Pt 1 /CoAlO x (Figure d), and Pt n /CoAlO x (Figure e) maintains the original sheet-like hexagonal structure of the CoAl-LDHs (Figure b) precursor. , High-resolution transmission electron microscopy (HR-TEM) measurement of Pt 1 /CoAlO x and Pt n /CoAlO x was performed to further demonstrate the microstructure of the supported Pt-based catalysts. For these samples, HR-TEM–EDX mapping images of Pt 1 /CoAlO x (Figure f,g) and Pt n /CoAlO x (Figure h,i) illustrate a high-dispersed Pt species loading on the CoAlO x support over each sample, demonstrating the successful introduction of Pt species.…”

Section: Resultsmentioning

confidence: 94%

“…Based on the consequence of inductively coupled plasma atomic emission spectrometry (ICP-AES, Table S1), the concentration of Pt species is close to the theoretical content. As shown in the scanning electron microscopy (SEM) images (Figure 1b−e), the morphology of CoAlO x (Figure 1c), Pt 1 / CoAlO x (Figure 1d), and Pt n /CoAlO x (Figure 1e) maintains the original sheet-like hexagonal structure 27 of the CoAl-LDHs (Figure 1b) precursor. 24,25 High-resolution transmission electron microscopy (HR-TEM) measurement of Pt The dispersion state of Pt species was imaged intuitively through aberration-correction high-angle annular dark-field scanning transmission electron microscopy (AC-HAADF-STEM).…”

Section: ■ Introductionmentioning

confidence: 87%

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Pt Single Atoms and Nanosized Clusters as Catalytic Reaction Platforms for Selective Hydrogenation Applications

Xu,

Feng,

Wang

et al. 2023

ACS Appl. Nano Mater.

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The exploitation and design of high-efficiency catalysts have attracted extensive attention in the selective regulation of hydrogenation reactions; however, it remains a tremendous challenge currently. Herein, we report two kinds of nanosized Pt-based catalysts, including single-atom catalysts (SACs) and nanosized cluster catalysts (NCCs), anchored onto a CoAlO x support via the topotactic transformation of layered double hydroxides. The SAC (Pt 1 /CoAlO x ) exhibits a >99% selectivity toward the hydrogenation of furfural (FAL) to furfuryl alcohol (FOL), while the NCC (Pt n /CoAlO x ) shows a >99% selectivity for tetrahydrofurfuryl alcohol (THFOL) under a mild reaction condition (room temperature and a 0.1 MPa pressure of H 2 ). Both in situ experiments and theoretical calculations reveal that the aggregation state (single atom or nanosized cluster) of Pt atoms influences the adsorption configuration of FAL, in which the adsorption of C�O occurs on Pt single atoms over Pt 1 /CoAlO x and the adsorption of both C�C and C�O occurs on continuous Pt atoms over Pt n /CoAlO x . The structure−selectivity relationship substantiates that metal ensemble size has an important effect on the adsorption structure of the reaction substrate and thus results in the different selectivity of the hydrogenation reaction.

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Section: Resultsmentioning

confidence: 94%

“…Based on the consequence of inductively coupled plasma atomic emission spectrometry (ICP-AES, Table S1), the concentration of Pt species is close to the theoretical content. As shown in the scanning electron microscopy (SEM) images (Figure 1b−e), the morphology of CoAlO x (Figure 1c), Pt 1 / CoAlO x (Figure 1d), and Pt n /CoAlO x (Figure 1e) maintains the original sheet-like hexagonal structure 27 of the CoAl-LDHs (Figure 1b) precursor. 24,25 High-resolution transmission electron microscopy (HR-TEM) measurement of Pt The dispersion state of Pt species was imaged intuitively through aberration-correction high-angle annular dark-field scanning transmission electron microscopy (AC-HAADF-STEM).…”

Section: ■ Introductionmentioning

confidence: 87%

Pt Single Atoms and Nanosized Clusters as Catalytic Reaction Platforms for Selective Hydrogenation Applications

Xu,

Feng,

Wang

et al. 2023

ACS Appl. Nano Mater.

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“…This demonstrates that LDHs possess great potential for UV-blocking. Some related reports indicate that among these many kinds of LDH materials, such as CoAl-LDHs, NiAl-LDHs, and MgAl-LDHs, they need to be combined with other organic UV absorbers to achieve excellent UV-blocking properties. − However, NiFe-LDHs show much better performance compared with them because they do not require any other UV absorber doping. On one hand, NiFe-LDH crystals can reflect and scatter part of the UV light.…”

Section: Introductionmentioning

confidence: 99%

Green Strategy toward the Synthesis of NiFe-LDH-Heated Nanodispersions as a Kind of Highly Efficient UV-Blocking Materials

Li,

Huang,

Chen

2023

Ind. Eng. Chem. Res.

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As an important kind of material with a layered structure, NiFe-LDHs have been applied extensively in many fields due to their outstanding properties. However, the severe aggregation behavior between nanoparticles greatly limits the application performance of such materials. Herein, we propose a facile and efficient approach for preparing well-dispersed NiFe-LDH nanoparticles with excellent UV-blocking properties. First, NiFe-LDH nanoparticles with an average particle size of 44 nm were successfully synthesized via a coprecipitation method combined with the in situ surface modification technique. After that, highly crystalline materials consisting of NiFe-LDH-heated nanoparticles were achieved with hydrothermal treatment at 120 °C or a higher temperature. It is worth noting that the particle size increased with the increasing temperature, and the morphology of particles turned into hexagonal nanoflakes gradually. Based on the as-obtained NiFe-LDH-heated nanoparticles, highly transparent and flexible PVA-LDH nanocomposite films were readily fabricated. According to the characterizations, these as-prepared nanocomposite films exhibited splendid performance on optical transparency, UV-blocking, and mechanical properties when the filling amount of NiFe-LDH-heated nanoparticles was increased to 20% or higher. In particular, the methylene blue (MB) solution showed a much slower degradation rate under the radiation of UV light with the protection of a NiFe-LDH-heated nanocomposite film compared with the samples protected with a pure PVA film or without any blocking, which demonstrated the distinguished UV-blocking ability of these as-prepared NiFe-LDH-heated nanoparticles. It is expected that this green approach is prospective for the large-scale preparation of NiFe-LDH nanomaterials with excellent UV-blocking performance and some other properties.

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“…However, the photo-oxidative aging caused by UV and oxygen has often been less extensively studied in previous research due to the lack of related specification or standards. 29,30 In the recent decade, the investigation of UV aging of asphalt has received increasing attention due to the recognition of the significant influence of UV aging on the durability of asphalt-based materials. 31 To improve the aging resistance of asphalt, many attempts have been made, but the simplest and most effective way was to modify the asphalt by adding antiaging agents.…”

Section: ■ Introductionmentioning

confidence: 99%

“…As for the thermal-oxidative aging of asphalt, it has been extensively studied under the guidance of specifications, for example, the thin-film oven test (TFOT, ASTM D1754) and rolling thin-film oven test (RTFOT, ASTM D2872) for short-term aging simulations and the pressurized aging vessel (PAV, ASTM D6521) for long-term aging simulation. However, the photo-oxidative aging caused by UV and oxygen has often been less extensively studied in previous research due to the lack of related specification or standards. , In the recent decade, the investigation of UV aging of asphalt has received increasing attention due to the recognition of the significant influence of UV aging on the durability of asphalt-based materials . To improve the aging resistance of asphalt, many attempts have been made, but the simplest and most effective way was to modify the asphalt by adding antiaging agents.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Aging Resistance of Organic Layered Double Hydroxide/Antioxidant Composite-Modified Asphalt

Jia³

et al. 2022

ACS Sustainable Chem. Eng.

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Two organic layered double hydroxides (OLDHs) intercalated by UV absorbents of para-aminobenzoic acid (PABA) and cinnamic acid (CA) were synthesized by the anion-exchange method, and their structures and properties were characterized. Then, the two OLDHs were applied to modify asphalt together with two different antioxidants, octadecyl-3-(3,5-di-tert-butyl-4hydroxyphenyl)-propionate (1076) and pentaerythritol tetrakis (3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) ( 1010), aiming at synergistically enhancing the aging resistance of asphalt. The aging behaviors of modified asphalt were evaluated by the analyses of physical properties and chemical structures of modified asphalt after pressurized aging vessel (PAV) and ultraviolet (UV) aging tests. The results indicated that PABA and CA were successfully intercalated into the interlayers of LDHs and that the lipophilicity and UV absorbance of LDHs were significantly improved due to the organic intercalation. Hence, OLDH-modified asphalt presented enhanced anti-UV aging performance compared with LDH-modified asphalt. Meanwhile, the addition of organic LDH/ antioxidant composites could further improve the antiaging performance of asphalt, including thermal-oxidation and photo-oxidation aging resistance, exhibiting a synergistic effect. Furthermore, different combinations of OLDHs and antioxidants had different improvement effects on the aging properties of asphalt; to be specific, the composites of 1076/PABA-LDHs and 1010/CA-LDHs were superior to those of 1010/PABA-LDHs and 1076/CA-LDHs, respectively, in promoting the aging resistance of asphalt.

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A facile approach to enhancing the UV blocking properties of layered double hydroxides and potential application in asphalt

Cited by 5 publications

References 30 publications

Pt Single Atoms and Nanosized Clusters as Catalytic Reaction Platforms for Selective Hydrogenation Applications

Pt Single Atoms and Nanosized Clusters as Catalytic Reaction Platforms for Selective Hydrogenation Applications

Green Strategy toward the Synthesis of NiFe-LDH-Heated Nanodispersions as a Kind of Highly Efficient UV-Blocking Materials

Investigation of Aging Resistance of Organic Layered Double Hydroxide/Antioxidant Composite-Modified Asphalt

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