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Supported gold (Au) catalysts appear attractive for the catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol, a promising method for eliminating 4-NP pollutant in water media. Selecting an appropriate support is a crucial step for obtaining supported Au catalysts with excellent activity. Herein, we demonstrate for the first time that cyanuric acid-based material (CAM) is an appropriate support material, where Au/CAM catalysts catalyze the 4-NP reduction in water at room temperature. The reaction time for complete conversion of 4-NP can be reduced by ~ 10 times to even two orders of magnitude compared to some other reported supported Au catalysts and depending on the reaction conditions used. Moreover, CAM can be obtained using an extremely simple and green synthesis method. [ABSTRACT FROM AUTHOR]

Abstract: Polyaniline(PANi)/Fe3O4 nanocomposites have been prepared via in situ chemical oxidative polymerization directed with cationic surfactant cetyltrimethylammonium bromide (CTAB). The studies show that PANi can coat Fe3O4 nanoparticles. CTAB can produce insoluble substance with initiator of polyreaction, and plays a very important role for the coating of Fe3O4 nanoparticles by PANi. Many Fe3O4 nanoparticles are bald without being coated by PANi when CTAB is replaced by anionic surfactant, so anionic surfactant can not play the role of CTAB. [Copyright &y& Elsevier]

Abstract: A water/oil microemulsion system having been successfully used for synthesizing polyaniline(PANi) nanoparticles, was employed for preparing PANi/multi-walled carbon nanotube (MWCNT) nanocomposites via in situ chemical oxidative polymerization. The structures and the electrical property of PANi/MWCNT nanocomposites were also studied. The studies showed that PANi could coat MWCNTs to form nanocables with core–shell structure, and the backbone structure of PANi was not damaged by the introduction of MWCNTs. The conductivities of PANi/MWCNT nanocomposites were higher than that of PANi. Moreover, a model was supposed to be used for describing a PANi/MWCNT nanocable formation by in situ microemulsion polymerization. [Copyright &y& Elsevier]

Abstract: Co-filled carbon nanotubes composites were synthesized via using a simple and efficient wet chemistry solution method. The samples were characterized by transmission electron microscopy. Microwave-absorbing properties were investigated by measuring complex permittivity and complex permeability of the absorber in a frequency range of 2–18GHz. The reflection loss (R.L.), matching frequency (f m) and matching thickness (d m) were calculated using the theory of the absorbing wall. The electromagnetic properties and microwave-absorbing characteristics effects of the modified carbon nanotubes by the encapsulation of metal Co were investigated. A matching thickness is found corresponding to a matching frequency. The maximum reflection loss is about −39.32dB and the bandwidth corresponding to the reflection loss below −10dB is 3.47GHz. With increasing thickness, the maximum reflection loss shifts to lower frequency. [Copyright &y& Elsevier]