Simple and green synthesis of calcium alginate/AgCl nanocomposites with low-smoke flame-retardant and antimicrobial properties

Abstract

Fire hazards and infectious diseases result in great threats to public safety and human health, thus developing multi-functional materials to deal with these issues is critical and yet has remained challenging to date. In this work, we report a facile and ecofriendly synthetic approach for the preparation of calcium alginate/silver chloride (CA/AgCl) nanocomposites with dual functions of excellent flame-retardant and antibacterial activity. Multi characterization techniques and antibacterial assays were performed to investigate the flame-retardant and antibacterial properties of the CA/AgCl nanocomposites. The obtained results show that the CA/AgCl nanocomposites exhibited much higher limiting oxygen index value ([ 60%) than that of CA (48%) with a UL-94 rating of V-0. Moreover, CA/AgCl particularly displayed an efficiently smoke-suppressive feature by achieving a total smoke release value of 2.7 m 2 /m 2 , which was reduced by 91%, compared to CA. The antibacterial rates of the CA/AgCl nanocomposites against E. coli and S. aureus were measured to be 99.67% and 99.77%, respectively, while CA showed quite weak antibacterial rates. In addition, the flame-retardant and antibacterial mechanisms were analyzed and proposed based on the experimental data. This study provides a novel nanocomposite material with both flame-retardant and antibacterial properties which show promising application prospects in the fields of decorative materials and textile industry.

Multifunctional Dual-Pore Network Aerogel Composite Material for Broadband Sound Absorption, Thermal Insulation, and Fire Repellent Applications

“…When the thermal disintegration happens and forms the char interface, the layer acts as a protective barrier that could effectively inhibit further decomposition. 45,49 The structure of CAP was observed after flame subjection, as shown in Figure S8. The fabricated scaffold maintained the lamellar structure upon combustion, suggesting the effectiveness of the SA assembly onto the porous structure.…”

Simple and green synthesis of calcium alginate/hydroxyapatite hybrid material without high temperature treatment and its flame retardancy

“…The second stage (200-300 ℃) and third stage (300-400 ℃) were the primary and complex pyrolysis processes, including the breaking of glycosidic bond, dehydration, decarboxylation, decarbonylation, etc. (Zhang et al 2021). According to Table.…”

Seaweed-Derived Alginate–Cellulose Nanofiber Aerogel for Insulation Applications

“…First, generation of vapor and CO 2 by dehydration and decarboxylation carry away most of the heat during alginate decomposition process, where alginate molecules breaks down into M and G blocks. 48 Meanwhile, in the outermost layer, the remaining solid residue forms a dense carbon layer. The formation of the barrier layer can prevent heat and combustible gas from diffusing into the inner layer, notably reducing the heat release rate and promoting the flame retardancy.…”

“…Apart from the aerogel structure, the predominately flame-retardant behavior of ACNF-X may be attributed to two reasons. First, generation of vapor and CO 2 by dehydration and decarboxylation carry away most of the heat during alginate decomposition process, where alginate molecules breaks down into M and G blocks . Meanwhile, in the outermost layer, the remaining solid residue forms a dense carbon layer.…”