Self-sacrificing MOF-derived hierarchical porous In2S3 nanostructures with enhanced photocatalytic performance
Fabrication of porous hierarchical structures is an effective method to improve the pho-to-absorption capability of photocatalysts by enhancing the photogenerated charge separation and transfer.In-based metal-organic frameworks(MOFs)are utilized as self-sacrificial templates to synthesize various hierarchical In2S3 photocatalysts including hollow nanotubes/microtubes/spheres and dodecahedrons by the sulfidation process.The porous hierarchical structures improve multiple refraction and reflection of the incident light,provide larger surface areas,and increase the light utilization and phase separation efficiency of the photogenerated carriers.As a result,the pho-tocatalytic efficiency is much higher than that of the bulk and commercial In2S3.In particular,the hollow In2S3 nanotubes(HNTs)have the best photocatalytic properties boosting degradation rates of organic pollutants that are 135.6 and 446.9 times than those of the bulk and commercial-grade In2S3,respectively.Theoretical calculations,optical/electrical characterization,and free radical trapping experiments reveal that under the condition of light,the photogenerated electron hole pairs produced in In2S3-HNT can effectively separate due to its hierarchical porous structure.So,the In2S3-HNT can accumulate more reactive oxygen radicals.This novel self-sacrificial template meth-od has large potential in the design and fabrication of hierarchical high-efficiency photocatalysts.
万方数据
