State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
Pd has been widely used as a highly active noble metal catalyst for organic reactions such as Suzuki coupling reaction. To improve its catalytic performance for Suzuki coupling reaction, Pd/MoS2 flowerlike superstructures were designed and prepared by using MoS2 with photothermal effect as the carrier. Firstly, MoS2 flowerlike superstructures were synthesized by a simple hydrothermal method, and they were constructed from nanosheets with diameters of 200~300 nm and thicknesses of about 7 nm. Pd nanoparticles with diameters of about 11 nm were loaded on the surface of MoS2 by a reduction route. Subsequently, by using Pd/MoS2 flower-like superstructures as the catalyst, the conversion efficiency of Suzuki coupling reaction was investigated under both laser heating and oil bath heating conditions. When the intensity of 808 nm laser as heating sources went up from 1 to 4 W/cm2, the equilibrium temperature of solution from laser heating increased from 29.4 to 60.8 ℃. Accordingly, the photothermal catalysis yield enhanced from 30.5% to 86.3%, which was significantly higher than the thermocatalytic yield (from 24.3% to 60.4%) at the same temperature from oil bath heating. When the reaction temperature was 40 ℃, the photothermal catalysis rate was 1.5 times as high as that of the thermal catalysis. Therefore, Pd/MoS2 flower-like superstructures show good photothermal catalytic performance, which assists in the design of highly active catalysts for Suzuki coupling reaction.