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Novel phenyl-modified magnetic graphene/mesoporous silica (MG-MS-Ph) composites with hierarchical bridge-pore structure were successfully synthesized. The magnetic graphene (MG) as bridge were obtained by one-step solvothermal approach and then phenyl-functionalized mesoporous silica (MS-Ph) as pore modified the MG surfaces through one-pot facile strategy. The resulting MG-MS-Ph exhibited large surface area (446.5 m 2 g −1 ), highly ordered mesopores with uniform pore size (2.8 nm) and pore volume (0.32 cm 3 g −1 ) and higher saturation magnetization (25 emu g −1 ). These wonderful features made MG-MS-Ph as a promising magnetic solid-phase extraction adsorbent for the removal of pesticides from wastewater. Batch adsorption studies indicated that the novel composites exhibited superior adsorption capacity of pesticides compared with other adsorbents including Activated carbon, Multi-walled carbon nanotube and Single-walled carbon nanotube. Therefore, MG-MS-Ph as a low cost and efficient adsorbents for the removal of toxic pesticides would be economically and technically feasible. [ABSTRACT FROM AUTHOR]

Abstract: Incorporation of reduced graphene oxide (rGO) in Co3O4 matrix is systematically investigated through a chemical route for supercapacitors. The α-Co(OH)2 supported by graphene oxide is first fabricated by a chemical precipitation approach. Thermal decompositions of these precursors at the given temperature (150°C) lead to rGO/Co3O4 composites. Measurement results show that the morphology and electrochemical activity of the rGO/Co3O4 composites are influenced significantly by the mass ratios of rGO to Co3O4. When used as electrode materials in supercapacitors, the composite with mass ratio of 0.22:1 (rGO:Co3O4) achieves the specific capacitance as high as 291Fg−1 at 1Ag−1 in the potential range of −0.4 to 0.55V, as compared with each individual counterpart (56 and 161Fg−1 for rGO and Co3O4, respectively). In addition, the excellent rate capability and well cycling ability are observed in the composite electrodes. The enhanced electrochemical performance is indicative of a positive synergistic effect between rGO and Co3O4. These results suggest the importance and great potential of graphene based composites in the development of high-performance energy-storage systems. [Copyright &y& Elsevier]