Upgrading the pore-size scale of MIL-53 from microporous to macroporous for adsorbing triethyl phosphate and reducing the fire risk of polystyrene

Zhao, Huidong; Yuan, Bihe; Zhan, Yuanyuan; Fangzhou,

doi:10.1016/j.compositesa.2022.107003

Cited by 25 publications

(11 citation statements)

References 60 publications

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“…The peak of smoke production rate (pSPR) and TSP of the PUA/Co 3 O 4 @OZC-2 composite are significantly reduced by 29.7 and 40.4%, respectively, relative to pure PUA. Moreover, the SPR and TSP of PUA/Co 3 O 4 @OZC-2 are significantly lower than those of PUA/ZIF-67, which suggests that the hierarchical pores are beneficial to absorb and catalyze the smoke particles and pyrolytic volatiles (Figure a,b) . Smoke factor (SF), which is the product of HRR and TSR, is usually employed to comprehensively evaluate the smoke generation condition of the polymer during combustion .…”

Section: Resultsmentioning

confidence: 99%

“…On the one hand, Co 3 O 4 @OZC-2 contains transition metal elements with catalytic effect, and its open-wall structure and high specific surface area expose more active sites, which enhances the formation of the compact char layer. , On the other hand, Co 3 O 4 @OZC-2 features a hierarchical pore structure that slows down the release of volatiles during the decomposition of the matrix. Because of this unique structure, toxic gases and smoke particles are easily trapped by the cage through physical and chemical adsorption, and they have to go through a more complex pathway than usual, the so-called “labyrinth” effect. , Impressively, catalytic structures with both mesopores and micropores are more effective than solely microporous catalytic structures for smoke and toxic gas inhibition, as mesoporous structures can capture large smoke particles more efficiently. However, out-of-size mesoporous structures may impair the adsorption capacity for smoke.…”

Section: Resultsmentioning

confidence: 99%

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A Gas-Steamed Route to Mesoporous Open Metal–Organic Framework Cages Enhancing Flame Retardancy and Smoke Suppression of Polyurea

Song,

Bi,

et al. 2024

ACS Appl. Mater. Interfaces

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Up to now, metal−organic frameworks (MOFs) with open nanostructures have shown outstanding capabilities in trapping smoke particles compared to the original MOFs. However, only a few MOF-based strategies have been reported to synthesize hierarchical porous cages thus far, which are mainly restricted to environmentally unfriendly wet-chemical liquid methods. Herein, as a proof-ofconcept, a gas-steamed metal−organic framework approach was designed to fabricate a series of cheeselike open cages with hierarchical porosity. Briefly, zeolitic imidazolate framework-67 (ZIF-67) and phytic acid were employed as precursor and etchant, respectively. Abandoning the conventional wet-chemical method, the coordination bond of ZIF-67 was cleaved by acidic steam, forming an open framework with a high specific surface area and a hierarchical porous structure. The universality of this method was also confirmed by the selection of different etchants. Impressively, they also show outstanding fume-toxic adsorption capability and labyrinth effects based on abundant and complex porous channels. At only 5 wt % loading, Co 3 O 4 @open ZIF-67 cage-2 (Co 3 O 4 @OZC-2) imparted polyurea (PUA) composites with a 21.2% limiting oxygen index, and the peak of heat release rate, total heat release, and total smoke production were reduced by around 37.5, 25.5, and 40.4%, respectively, compared to neat PUA. This work will shed light on the advanced structural design of polymer composites with high fire safety, especially smoke suppression performance, so as to obtain more feasible applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A Gas-Steamed Route to Mesoporous Open Metal–Organic Framework Cages Enhancing Flame Retardancy and Smoke Suppression of Polyurea

Song,

Bi,

et al. 2024

ACS Appl. Mater. Interfaces

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“…For commercial EPS (Video S1), the region in direct contact with the visible flame quickly shrank and ignited, followed by a fire spreading to the whole sample. Profusive dark black smoke was observed from the flame, associated with irritating and toxic compounds. , Moreover, molten EPS droplets dripped from the foam during burning (Figure d). Such melting–dripping phenomenon is associated with fire spreading, a major safety concern of most synthetic materials .…”

Section: Resultsmentioning

confidence: 99%

Chemical Binder-Free and Oven-Dried Lignocellulose/Clay Composite Foams: Flame Resistance, Thermal Insulation, and Recyclability

Zhu,

et al. 2023

ACS Sustainable Chem. Eng.

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Global efforts to reduce carbon emissions and improve thermal comfort demand sustainable and safe-to-use insulative materials. This study advances a new type of chemical binder-free lignocellulose/clay composite foam as a sustainable alternative to the currently used synthetic and glass/mineral counterparts. Pressurized disk milling unraveled submicron "hairy" fibrillation on the surface of refiner mechanical pulp (RMP). Such fibrillated fibers were then subjected to a foam laying process, with kaolinite being incorporated as an efficient and cost-effective fire retardant. Upon oven drying, the foams display suitable structural and mechanical robustness. Through mild fibrillation treatment of the RMP, a clay retention of up to 2-fold by weight was achieved without compromising the properties of the foam, removing the need for the addition of chemical binders. The foam density, mechanical and thermal properties, and flame resistance were systematically investigated with respect to the relative fiber loading as well as surfactant and clay addition. A low thermal conductivity (43.7 ± 0.7 mW/(m•K)) and high flame resistance (limiting oxygen index of ∼43%) were demonstrated for hybrid foams of apparent density of 136 ± 1 kg/m 3 that also displayed good compressive strength (Young's modulus of 0.805 ± 0.158 MPa and compressive stress of 0.126 ± 0.008 MPa at 25% strain). Remarkably, owing to the absence of chemical binding, facile recyclability was demonstrated over three cycles, with no significant reduction in performance. Overall, this work proposes a readily scalable technology toward safe-to-use, recyclable lignocellulose/clay composite foams for building insulation.

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“…Fe-MOF and the functionalized MOF (T-Fe-MOF) were prepared in accordance with the method described in our previous study 7 and the detailed preparation method can be found in the ESI. † The preparation process of S-Fe-MOF is displayed in Fig.…”

Section: Synthesis Of Fe-mof T-fe-mof and S-fe-mofmentioning

confidence: 99%

“…[3][4][5][6] In previous research, triethyl phosphate (TEP) was adsorbed on the surface of MIL-53 (a kind of MOF with iron as the metal and terephthalic acid as the ligand) to change its surface structure. 7 Surprisingly, scanning electron microscopy (SEM) images indicated that numerous papillary structures formed on the surface. This lotus-like surface structure has inspired us.…”

Section: Introductionmentioning

confidence: 99%

The design of a metal–organic framework with flame-retardant performance and bionic hydrophobic surface inspired by the lotus leaf

et al. 2022

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Upgrading the pore-size scale of MIL-53 from microporous to macroporous for adsorbing triethyl phosphate and reducing the fire risk of polystyrene

Cited by 25 publications

References 60 publications

A Gas-Steamed Route to Mesoporous Open Metal–Organic Framework Cages Enhancing Flame Retardancy and Smoke Suppression of Polyurea

A Gas-Steamed Route to Mesoporous Open Metal–Organic Framework Cages Enhancing Flame Retardancy and Smoke Suppression of Polyurea

Chemical Binder-Free and Oven-Dried Lignocellulose/Clay Composite Foams: Flame Resistance, Thermal Insulation, and Recyclability

The design of a metal–organic framework with flame-retardant performance and bionic hydrophobic surface inspired by the lotus leaf

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