具有高效光催化析氢和污染物降解性能的三维多孔V2O5/g-C3N4制备

Preparation of 3D Porous V2O5/g-C3N4 with Efficient Photocatalytic Hydrogen Evolution and Pollutant Degradation Performance

摘要:

面对能源日益短缺和水环境污染问题，开发高性能催化剂用于光催化析氢和污染物降解具有重要意义。采用热聚合法制备复合催化剂V₂O₅/g-C₃N₄，测试结果表明该复合催化剂具备稳定的三维多孔结构，比表面积大，表面活性位点多。V₂O₅负载可以增强g-C₃N₄的光吸收能力，促进光生电荷的分离转移，进而提高其光催化活性。在可见光照射下V₂O₅/g-C₃N₄具有优异的产氢活性和较高的光催化降解RhB性能，其析氢活性为1.38 mmol?g^-1?h^-1，降解RhB性能为96.85%。通过活性粒子捕获实验探究了催化过程中RhB的降解机制，结果表明在RhB的光催化降解过程中超氧自由基起着至关重要的作用。该研究对制备高活性的可见光响应催化剂具有指导意义。

Abstract:

With increasing energy shortage and water pollution， it is significant to develop high-performance catalysts for photocatalytic hydrogen evolution and pollutant degradation. In this paper， the composite catalyst V₂O₅/g-C₃N₄ was prepared by thermal polymerization. The test results showed that the composite catalyst had a stable three-dimensional porous structure， large specific surface area， and many surface active sites. The V₂O₅ loading enhanced the light absorption ability of g-C₃N₄， promoted the separation and transfer of photogenerated charges， and then improved its photocatalytic activity. The V₂O₅/g-C₃N₄ had excellent hydrogen production activity and high photocatalytic degradation performance of RhB under visible light irradiation. The hydrogen evolution activity was 1.38 mmol?g^-1?h^-1， and the RhB degradation performance was 96.85%. The degradation mechanism of RhB in the catalytic process was explored by active particle capture experiments， and the results showed that superoxide radicals played a crucial role in the photocatalytic degradation of RhB. This study has guiding significance for preparing highly active visible light-responsive catalysts.