Abstract
Coal/ZnAl-Layered double hydroxides (ZnAl-LDHs) composites were synthesized via a co-precipitate method using Shenfu coal as a raw material. Effect of coal on the structure, morphology and thermal properties of coal/LDHs composites were investigated by XRD, FT-IR, SEM and DSC analysis methods. The results indicated that coal provided acidic functional groups as the interlayer anion of composites, and the mineral materials in coal made the structure of composites more complicated. The morphologies and particle sizes of composites were affected by the porosity and network characteristics of coal. Although exothermic behavior of coal weakened the endothermic efficiency of ZnAl-LDHs during the degradation process, the coal char on the surface of composites formed an insulation layer, which provided a synergistic fire retardant of ZnAl-LDHs in coal spontaneous combustion.
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