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In the present work, a fire-blocking coating consisting of chitosan and molybdenum disulfide (MoS2) was firstly deposited onto flexible polyurethane (FPU) foam by the layer-by-layer assembly technique. With the MoS2-filled coating, the FPU foam could burn without melt dripping during the whole combustion and keep its shape after combustion, while the pure foam was consumed completely. The analysis by thermogravimetric analysis/infrared spectrometry indicated that MoS2-filled coating could obviously reduce the amount of organic gaseous pyrolysis products and toxic volatiles during thermal decomposition of the foam. The cone calorimeter results indicated that the FPU foam with 8.5 wt% coating showed great reduction in peak of heat release rate (70%), peak smoke production rate (62.4%) and total smoke released (33.3%). Such a significant improvement in flame-retardant and the smoke suppression properties for FPU foam could be attributed to the protective effect of MoS2-filled coating.

A novel type of adsorptive material, sodium dodecylbenzenesulfonate (SDBS)-citrate-layered double hydroxide (LDH), was synthesized by modifying Mg-Al LDH with both SDBS and citrate using the ion-exchange method for the first time. Modified LDH was characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, low-temperature N2 adsorption, and elemental analysis. Results indicated that DBS− and citrate3− anions were intercalated in the LDH interlayers, and surface hydrophobicity increased after modification. SDBS-citrate-LDH can simultaneously adsorb p-cresol and Cu2+ (or Cd2+) from the mixed solution. p-Cresol adsorption was attributed to a partition retention mechanism (adsolubilization of p-cresol into the interlayer three-dimensional organic phase formed by DBS− anions). Cu2+ (or Cd2+) adsorption was dominated by formation of complexes between Cu2+ (or Cd2+) and citrate3− anions in the interlayer of modified LDH. Negative values of ΔGo and ΔHo observed for p-cresol, Cu2+,...