Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 300, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2022.121947
Keywords
D-A typeg-C3N4; Expanded p-conjugated system; p-p interactions; DFT calculation
Categories
Funding
- Natural Science Foundation of China [51979081, 52100179]
- Fundamental Research Funds for the Central Universities [B210202052]
- National Science Funds for Creative Research Groups of China [51421006]
- PAPD
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In this study, D-A type graphitic carbon nitride (g-C3N4) with expanded pi-conjugated system was prepared. The formed charge transfer channels in D-A g-C3N4 substantially promote the spatial separation and transfer efficiency of photogenerated charges. Additionally, the expanded pi-conjugated system improves light absorption ability and enhances the interactions between catalysts and pollutant molecules.
The interaction and electron transfer between pollutant molecules and photocatalysts are critical to the degra-dation process but has been rarely studied. In the present contribution, donor-acceptor (D-A) type graphitic carbon nitride (g-C3N4) with expanded pi-conjugated system are elaborately prepared. The removal efficiency of bisphenol A (a typical endocrine disruptor) by the optimal sample is 2.9 times as that of pure g-C3N4. Based on the experimental results and DFT calculation, it is found that the formed charge transfer channels in D-A g-C3N4 substantially promote the spatial separation and transfer efficiency of photogenerated charges. Besides, the expanded pi-conjugated system improves light absorption ability, enhances the pi-pi interactions between catalysts and pollutant molecules (facilitating the adsorption and electron transfer). This study provides a new idea for photocatalysis to achieve efficient environmental remediation, that is the adsorption and electron transfer of pollutants in the degradation process should be further considered while modifying the photocatalysts.
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