A sustainable pore wall strengthening for strong and fire-retardant nanopolymerised wood

Zhang, Kun; Zhai, Wenxiang; Cao, Zhifeng; Wang, Yaoxing; Li, Lianzhen; Li, Jian; Liu, Jiuqing; Xie, Yanjun; Gan, Wentao

doi:10.1016/j.cej.2023.147971

“…14 Significantly, the aerogels prepared by the directional freeze-casting method, inspired by the bottom-up transport of wood, have vertical pore structures, which contribute to improving the thermal insulation performance, and structural strength as building materials. 15 However, lignocellulose aerogel is flammable, which constitutes a safety hazard in practical application 16,17 The preparation of thermally insulating lignocellulose aerogels with favorable flame retardancy and smoke suppression can effectively reduce the disastrous consequences of building fires, which has important practical implications. 18 Tourmaline nanoparticles (TPs) are efficient and green inorganic flame retardants.…”

Section: ■ Introductionmentioning

confidence: 99%

Eco-Friendly Tourmaline@MOF Lignocellulose Aerogel with Favorable Fire Retardancy and Smoke Suppression for Insulation Materials

Sun,

Yu,

Wang

et al. 2024

ACS Sustainable Chem. Eng.

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Inflammable insulation materials cause fire hazards, especially in smoke harm. High-performance flame-retardant insulation materials are urgently needed to address these safety issues. Herein, a multiple flame-retardant strategy was proposed to prepare a novel eco-friendly tourmaline/metal–organic framework (MOF) lignocellulose aerogel (TMLA) from deep eutectic solvent (DES)-treated low-value wood with favorable flame retardancy, smoke suppression, and thermal insulation by directional freeze-casting. The combination of DES treatment, tourmaline, and MOF synergistically promotes the flame retardancy of TMLA. In addition, the total smoke release is reduced due to the sedimentation of negative oxygen ions. Compared with the lignocellulose aerogel, the heat release rate, total heat release, and total smoke release of TMLA were reduced by 55.37, 52.37, and 64.20%, respectively, and the limiting oxygen index was greatly enhanced by 30.25%. The directional structure of TMLA results in anisotropy, leading to ideal axial thermal insulation properties (28.13 mW/mK) and a favorable compression strength (1.83 MPa). Supported by the positive outcomes of the life cycle assessment, the prepared TMLA is eco-friendly and has superior flame retardancy and smoke suppression to pave the way for the sustainable production and use of insulation materials.

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Scalable and Sustainable Zinc (II) Ions‐Glue‐Assisted Conversion of Biomass Waste Bits into Carbon Aerogels for Efficient Uranium Extraction

Zhao,

Zhou,

Tan

et al. 2024

Angewandte Chemie

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Carbon aerogels (CAs) are attracting great attention for their multifunctional applications. Additionally, a large amount of biomass bits waste generated from agriculture and industry is regarded as the main carbon resource. However, the development of a facile, sustainable, and efficient method to produce CAs from biomass waste remains challenging. Here, a one‐step Zn2+ ions glue triggered carbonization technology was reported to construct large‐scale and high‐performance CAs. Multiple biomass bits (wood bits, peanut shells, bamboo bits, and straw waste) were treated in the molten salt system (ZnCl2/KCl) at 300 °C for 2h to obtain large‐block biomass bits derived CAs. Zn2+ ions as the glue cleavage cellulose hydrogen bonds of natural biomass, then facilitate dehydration crosslinking reaction between cellulose, hemicellulose, and lignin for re‐constructing the whole block structure. The obtained CAs show high porosity (95%) and low density (0.078 g/cm3). Meanwhile, numerous of hydroxyl and carbonyl groups were well maintained during low temperature treated process, which facilitate chemical modification for various applications. For instance, amidoxime functionalized CAs were utilized as a filter for selective and highly efficient extraction of U(VI) from wastewater. The adsorption capacity and extraction efficiency reached 801.2 mg/g and 95% with a flux rate of 6.1×103 L/m2·h, respectively.

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Scalable and Sustainable Zinc (II) Ions‐Glue‐Assisted Conversion of Biomass Waste Bits into Carbon Aerogels for Efficient Uranium Extraction

Zhao,

Zhou,

Tan

et al. 2024

Angew Chem Int Ed

0

View full text Add to dashboard Cite

Carbon aerogels (CAs) are attracting great attention for their multifunctional applications. Additionally, a large amount of biomass bits waste generated from agriculture and industry is regarded as the main carbon resource. However, the development of a facile, sustainable, and efficient method to produce CAs from biomass waste remains challenging. Here, a one‐step Zn2+ ions glue triggered carbonization technology was reported to construct large‐scale and high‐performance CAs. Multiple biomass bits (wood bits, peanut shells, bamboo bits, and straw waste) were treated in the molten salt system (ZnCl2/KCl) at 300 °C for 2h to obtain large‐block biomass bits derived CAs. Zn2+ ions as the glue cleavage cellulose hydrogen bonds of natural biomass, then facilitate dehydration crosslinking reaction between cellulose, hemicellulose, and lignin for re‐constructing the whole block structure. The obtained CAs show high porosity (95%) and low density (0.078 g/cm3). Meanwhile, numerous of hydroxyl and carbonyl groups were well maintained during low temperature treated process, which facilitate chemical modification for various applications. For instance, amidoxime functionalized CAs were utilized as a filter for selective and highly efficient extraction of U(VI) from wastewater. The adsorption capacity and extraction efficiency reached 801.2 mg/g and 95% with a flux rate of 6.1×103 L/m2·h, respectively.

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A sustainable pore wall strengthening for strong and fire-retardant nanopolymerised wood

Cited by 5 publications

References 38 publications

Eco-Friendly Tourmaline@MOF Lignocellulose Aerogel with Favorable Fire Retardancy and Smoke Suppression for Insulation Materials

Eco-Friendly Tourmaline@MOF Lignocellulose Aerogel with Favorable Fire Retardancy and Smoke Suppression for Insulation Materials

Scalable and Sustainable Zinc (II) Ions‐Glue‐Assisted Conversion of Biomass Waste Bits into Carbon Aerogels for Efficient Uranium Extraction

Scalable and Sustainable Zinc (II) Ions‐Glue‐Assisted Conversion of Biomass Waste Bits into Carbon Aerogels for Efficient Uranium Extraction

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