Jin Gao,Junxia Shao,Hua Li,Najun Li,Dongyun Chen,Qingfeng Xu,Jianmei Lu
The sluggish charge transfer and fast recombination of charge carriers is a determining factor limiting photocatalytic efficiency of carbon nitride. Herein, carbon vacancies and Rh 2 O 3 nanoparticles were sequentially introduced into CN to accelerate photo-generated electron and hole transfer simultaneously, thereby improving the photocatalytic performance of CN to achieve the complete removal of Bisphenol A (BPA) in 15 min. Mechanism analyses reveal that the modification of the carbon vacancies regulates the active charge carriers, excitons and trap states, thus enhances the carrier separation capabilities and light absorption. Meanwhile, the in situ photodeposited Rh 2 O 3 nanoparticles, as a hole-transfer mediator, maximally suppress recombination of photogenerated charges. These synergistic effects result in promoting the separation and transfer of charge carriers and thus improving photocatalytic performances. This strategy can serve as guideline for the reasonable design of efficient photocatalysts for phenolic wastewater remediation.
Junxia Shao,Heng Fei,Hua Li,Liujun Yang,Miaomiao Li,Jin Gao,Huarong Liao,Jianmei Lu
Promoting carrier separation has received much attention owing to attractive enhancement effects in improving the utilization efficiency of photo-generated carrier. However, the photocatalytic performance has remained limiting mainly due to lack of magnifying carrier generation fundamentally. Herein, carrier generation enhanced CNS 0.6 /Au-1 is established by loading ultrafine Au nanoparticles on S-doped carbon nitride (CNS x ) for efficient hexavalent chromium degradation. CNS x can activate the n → π* electronic transition of carbon nitride besides keeping the original π → π* electronic transition. Plasmon-induced hot electron of Au nanoparticles merge with e − excited from π → π* and n → π* transition in CNS x increasing the amount of catalytically effective electrons, and the efficient carrier separation is also achieved. Near-infrared absorption CNS 0.6 /Au-1 exhibits a remarkable photo-reactivity for the degradation of Cr(Ⅵ), which can degrade 10 ppm Cr(Ⅵ) completely within 40 min. This work proposes a general strategy of increasing different types of electron transitions to promote carrier generation.
危险品化学品经营许可证（带存储）