In-situ fabrication of g-C3N4/MIL-68(In)-NH2 heterojunction composites with enhanced visible-light photocatalytic activity for degradation of ibuprofen

作者：Cao, Wen; Yuan, Yuhang; Yang, Cao; Wu, Shichuan; Cheng, Jianhua^*

来源：Chemical Engineering Journal, 2020, 391: 123608.

DOI：10.1016/j.cej.2019.123608

• In-based MOF
• Graphitic carbon nitride
• Heterojunction
• Visible light
• Ibuprofen degradation

For the first time, visible-light-driven g-C3N4/MIL-68(In)-NH2 heterojunction composites with high photocatalytic activity were prepared for the degradation of ibuprofen (IBP) using an in-situ solvothermal synthesis method assisted with ultrasonication. The composites achieved intensive visible-light absorption, enhanced separation efficiency of photogenerated carriers, and high adsorption capacity, thus achieving excellent photocatalytic degradation for IBP. Among all the composites, 10 wt% g-C3N4/MIL-68(In)-NH2 exhibited the maximum photocatalytic rate (0.01739 min(-1)), 19.28 and 2.00 times higher than those of g-C3N4 and MIL-68(In)-NH2, respectively. Moreover, the pH, ibuprofen concentration, and catalyst dosages played important roles both in photodegradation and adsorption. In addition, the photocatalytic mechanism was also elucidated, demonstrating that h(+) was the main reactive species, followed by center dot OH and center dot O-2(-) radicals, responsible for the degradation of IBP. Finally, seven aromatic intermediates of IBP were identified, and five possible degradation pathways were proposed, mainly involving hydroxylation, aldehyde oxidation, decarboxylation, and dehydrogenization reactions.

• 单位
  东莞理工学院