The composites of metal Co embedded in porous and N-doped graphitized carbon matrix (Co@pNGC) have been successfully synthesized by thermal decomposition of the bimetallic zeolitic imidazolate frameworks (bi-ZIFs) at different temperatures. The experimental results show that the calcination temperature played a decisive role on the graphitization, specific surface area, pore structure and electromagnetic wave (EM) absorption properties of Co@pNGC. The composites, Co@pNGC-600 and Co@pNGC-700 obtained at 600 C and 700 C, respectively, exhibit an outstanding EM wave absorption performance, which attributes to the synergistic effects of dielectric and magnetic loss, porous structure and multicomponent interfaces. Specifically, the optimal reflection loss of Co@pNGC-600 is À50.7 dB at 11.3 GHz and the widest effective absorption bandwidth (<À10 dB) could reach upto 5.5 GHz (12.3-17.8 GHz). The minimum thickness corresponding to the effective absorption is only 1.2 mm for Co@pNGC-700. Hence, these obtained porous carbon composites are promising microwave absorbing materials due to their lightweight, thin thickness, low filling, broad bandwidth, and strong absorption.rsc.li/rsc-advances 46436 | RSC Adv., 2017, 7, 46436-46444This journal is
AgI/Bi5O7I plate composite was fabricated at room temperature by the phase transition and morphological transformation of BiOI microspheres. The orange BiOI microsphere was transferred to light yellow AgI/Bi5O7I plate by the addition of NaOH and AgNO3 to the system. The formation process and possible transformation mechanism of AgI/Bi5O7I plate were detected and are discussed. The visible light absorption area of AgI/Bi5O7I extended to 667 nm and photo-excited electrons migrated from Bi5O7I to AgI to effectively inhibit the recombination of photo-generated carriers in the Z-scheme AgI/Bi5O7I plate. As a result, the photocatalytic ability of AgI/Bi5O7I plate increased by a factor of 21.9 than that of pure Bi5O7I and a factor of 45.7 than that of pure AgI under visible light irradiation. This study provides a facile fabrication of Z-scheme visible light photocatalysts with high performance and a method for designing semiconductor photocatalysts with controllable morphology.
A novel visible-light driven “plates-over-nanospheres” (PONs) photocatalyst with BiOI nanoplates grown on the surface of Fe3O4 nanospheres was prepared using a facile method.
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