In situ fabrication of I-doped Bi 2 O 2 CO 3 /g-C 3 N 4 heterojunctions for enhanced photodegradation activity under visible light

• Published in: Journal of hazardous materials 2020-03, Vol.385, p.121622
• Main Authors: Lan, Yunlong, Li, Zesheng, Xie, Wenyu, Li, Dehao, Yan, Guangxu, Guo, Shaohui, Pan, Chao, Wu, Jingwei
• Format: Article
• Language: English
• ISSN: 1873-3336

Iodine-doped Bi O CO /g-C N heterojunctions consisting of graphitic carbon nitride (g-C N ) and iodine-doped bismutite (Bi O CO ) components were successfully in situ synthesized by a one-pot hydrothermal method. Characterizations such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM) demonstrated iodine was favorably doped into the Bi O CO component, of which the {001} facets grew in situ from {002} facets of g-C N for the heterostructure construction of I-doped Bi O CO /g-C N (IB/CN). The photocatalytic activity of catalysts was evaluated by the degradation efficiency of 1,5-dihydroxynaphthalene under visible light. 1.5-IB/CN with a reasonable iodine doping amount (Bi: I molar ratio = 1.0: 1.5) exhibited the superior photodegradation performance compared to Bi O CO , achieving an 85.5% removal ratio after 100 min illumination. The enhanced activity of 1.5-IB/CN was attributed to both of the heterostructure that promoted the separation of photoinduced carriers and iodine doping that tuned the bandgap for sufficient visible-light harvesting. The degradation intermediates of 1,5-dihydroxynaphthalene in the system were determined and its possible photodegradation pathway was proposed in detail. This study provides a rational approach for enhancing the visible-light catalytic activity of wide-bandgap Bi O CO , and reveals a new perspective on the removal mechanism of organic pollutants.