Research and development of a sodium alginate/calcium ion gel based on in situ cross-linked double-network for controlling spontaneous combustion of coal

Yan, Bing-Rui; Hu, Xiangming; Zhao, Yanyun; Wu, Mingyue; Feng, Yue; He, Zhenglong; Qi, Guansheng; Ren, Wanxing; Liang, Yuntao; Wang, Wei; Qiao, Jian; Zhang, Qian

doi:10.1016/j.fuel.2022.124260

Cited by 27 publications

(6 citation statements)

References 38 publications

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“…In the preparation of biomass aerogels, the Ca 2+ cross-linking method is used. It is known that the Ca 2+ concentration − in the cross-linking method − is essential. The main reason for the formation of this hydrogel is the cross-linking reaction of the ionic alginate with the high-valent metal ion Ca 2+ , where the Na + in SA displaces Ca 2+ and the two carboxyl groups in SA interact with Ca 2+ as an ionic bridge, resulting in the formation of water-insoluble calcium alginate (Figure (a)).…”

Section: Resultsmentioning

confidence: 99%

Preparation of a Magnetic Core–Shell Bioreactor for Oil/Water Separation and Biodegradation

Chen,

Qu,

et al. 2023

Langmuir

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With the frequent occurrence of offshore oil spills, the effective separation and treatment of oily wastewater are essential to the environment. In this work, the core–shell bioreactor (abbreviated as Fe3O4/MHNTs-CNF@aerogel) was prepared with a core composed of camphor leaf cellulose-based aerogels for loading microorganisms and a shell derived from hydrophobic silane-modified halloysite doping with Fe3O4 for selective absorption of oil and maganetic recycling. The core–shell-structured bioreactor Fe3O4/MHNTs-CNF@aerogel has excellent self-floating properties and can float on water for up to 100 days. The whole core–shell structure not only has excellent oil/water separation performance but also has good microbial degradation performance. By applying it in water containing 5% diesel for the biodegradation test, the biodegradation efficiency of Fe3O4/MHNTs-CNF@aerogel for diesel can reach 82.4% in 10 days. The efficiency was 20% higher than for free microorganisms, and it still had excellent degradation ability after three degradation cycles, with a degradation rate of over 75%. In addition, the result obtained from the study on environmental tolerance shows that Fe3O4/MHNTs-CNF@aerogel possessed a strong tolerance ability under different pH and salinity conditions. The Fe3O4/MHNTs-CNF@aerogel also has superior mechanical properties; i.e., nearly no deformation occurs at 30 kPa. Compared with those conventional oil/water separation materials which can only absorb or separate the oils for water with limited capacity and taking the risk of secondary contamination, our core–shell-structured bioreactor is capable of not only selectively absorbing oil from water through its hydrophobic shell but also degrading it into a nontoxic substance by its microorganism-loaded core, thus showing great potential for practical application in oily wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Preparation of a Magnetic Core–Shell Bioreactor for Oil/Water Separation and Biodegradation

Chen,

Qu,

et al. 2023

Langmuir

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“…Within the material, GDL slowly releases H + , which decomposes CaEDTA and releases Ca 2+ . 28 The carboxyl group present on the SA G unit reacts with Ca 2+ , resulting in the formation of a gel with excellent toughness and stability. The stacked G units create a cross-linked network structure that fills the coal pores.…”

Section: Analysis Of Dust Suppression Mechanismmentioning

confidence: 99%

Study on the property of self‐reactive colloidal dust suppressant and the synergistic dust suppressant mechanism

Lu,

Liu,

et al. 2024

J of Applied Polymer Sci

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The poor plasticity of coal results in a large amount of dust during the mining process, thereby posing a significant impact on mine safety and the health of workers. In order to address this issue, a method has been proposed to suppress dust by enhancing the plasticity of coal through injecting a reactive material, which forms a colloid within the coal. The results implicated that the self‐active colloidal dust suppressant, composed of sodium alginate, gluconolactone, calcium disodium EDTA, and sodium dodecyl sulfate, effectively improved the moisture content of coal seams and decreased the brittleness of coal. Scanning electron microscopy and specific surface area test revealed that the dust suppressant not only tightly adheres to the surface of the coal after the reaction, but also penetrates the coal pores and forms a colloid on both the inner and outer surfaces of the coal. The material is rich in carboxyl and hydroxyl groups, which forms hydrogen bonds with the carboxyl and hydroxyl groups present in coal. This interaction enhances the toughness of coal. Simultaneously, it has the ability to adsorb water and function as a moisturizer. The combined synergistic effect of these mechanisms fundamentally reduces dust production during the coal mining process.

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“…This kind of gel has some disadvantages, such as low cross-linking strength and poor mechanical properties. The gel with multiple networks provides new ideas for solving such problems, which can combine all the advantages of the two gel networks and improve the gel structure and its performance …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The gel with multiple networks provides new ideas for solving such problems, which can combine all the advantages of the two gel networks and improve the gel structure and its performance. 22 In this paper, the synthesis of the PVA/PAM/MMT multiple network composite gel from polyvinyl alcohol (PVA), polyacrylamide (PAM), and MMT has been proposed. The first network was formed as a result of cross-linking of polyvinyl alcohol and boric acid under alkaline conditions.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Preparation of Montmorillonite-Type Multiple Network Composite Gel for Coal Spontaneous Combustion and Its Firefighting Mechanism

et al. 2023

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This paper proposes a new montmorillonite-type multiple network composite gel for the prevention of coal spontaneous combustion. The first network is formed by the cross-linking of polyvinyl alcohol (PVA) and boric acid under alkaline conditions. The second network is formed as a result of intermolecular hydrogen-bonding interactions between polyacrylamide (PAM) and polyvinyl alcohol. Montmorillonite (MMT) is designed as the backbone material in the preparation of composite gels. The optimal ratios of the reactants of the composite gel were determined through orthogonal experiments. The experimental results showed that PVA had the greatest influence on the gelation time, whereas the PAM concentration had the strongest influence on the gel permeability. The optimal blending ratio was 4% MMT + 2.5% PVA + 1.5% PAM. The chemical performances of the composite colloids, such as inhibition rate, reactive functional groups, and kinetics, were investigated. Results showed that multiple network composite gels could effectively inhibit the coal spontaneous combustion reaction. Based on the principle of coal spontaneous combustion and the cross-linking network structure of the composite gel, the flame-retardant and fire-extinguishing mechanisms were also explored in terms of both physical and chemical inhibition pathways.

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Research and development of a sodium alginate/calcium ion gel based on in situ cross-linked double-network for controlling spontaneous combustion of coal

Cited by 27 publications

References 38 publications

Preparation of a Magnetic Core–Shell Bioreactor for Oil/Water Separation and Biodegradation

Preparation of a Magnetic Core–Shell Bioreactor for Oil/Water Separation and Biodegradation

Study on the property of self‐reactive colloidal dust suppressant and the synergistic dust suppressant mechanism

Study on the Preparation of Montmorillonite-Type Multiple Network Composite Gel for Coal Spontaneous Combustion and Its Firefighting Mechanism

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