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In this study, a simple and eco-friendly method was proposed to efficiently prepare nanocomposite hydrogels with excellent mechanical properties and satisfactory pH response behaviour by frontal polymerization of DEM in close to 4 minutes.

2016): Facile synthesis of goethite anchored regenerated graphene oxide nanocomposite and its application in the removal of fluoride from drinking water, Desalination and Water Treatment, A B S T R A C TDrinking water fluoride pollution is a worldwide environmental problem imposing serious menace to human health. Goethite anchoring regenerated graphene oxide (α-FeOOH@rGO) nanocomposite was synthesized via facile one-step hydrolysis pathway with ferrous sulfate as starting material. Fluoride adsorption efficiencies in aqueous solution were also testified through batch adsorption experiments. α-FeOOH@rGO has good defluoridation ability in a wide range of pH and has a strong anti-interference ability in the presence of high concentration foreign anions. Pseudo-second-order adsorption kinetics and Langmuir adsorption isotherms are fitted well involved in fluoride adsorption process. The FTIR and XPS results prove that defluoridation proceeds through an ion-exchange mechanism with sulfatebearing in α-FeOOH@rGO crystal structure. It would be useful for the purpose of environmental protection in design and improvement of α-FeOOH@rGO as a cost-effective anion-exchange adsorbent.

Polyaniline (PANI)/silicon carbide (SiC) composites were prepared by emulsion polymerization using sodium dodecylbenzene sulfonate and ammonium persulfate as emulsifier and oxidant, respectively. The structure and morphology of the composites were characterized by Fourier transform infrared (FTIR) spectroscopy, x-ray diffraction (XRD), and scanning electron microscopy (SEM). The FTIR and XRD results indicated that there existed an interaction between PANI molecules and SiC particles. The SEM results indicated that SiC particles were covered with the conducting PANI. Microwave absorbing properties were investigated by measuring complex permittivity and complex permeability at 26.5-40 GHz. The results showed that the reflection loss (RL) properties of PANI/SiC composites exhibited significant improvements compared with pure SiC. A maximum RL of À36.3 dB was observed at 38.6 GHz with a thickness of 0.9 mm for the composites and the effective absorption band under À10 dB reached 6.2 GHz.