Atomic scale g-C3N4/Bi2WO6 2D/2D heterojunction with enhanced photocatalytic degradation of ibuprofen under visible light irradiation

作者：Wang, Jiajia; Tang, Lin^*; Zeng, Guangming; Deng, Yaocheng; Liu, Yani; Wang, Longlu; Zhou, Yaoyu; Guo, Zhi; Wang, Jingjing; Zhang, Chen

来源：Applied Catalysis B: Environmental , 2017, 209: 285-294.

DOI：10.1016/j.apcatb.2017.03.019

• Atomic scale
• 2D/2D heterojunction
• Monolayer Bi2WO6
• Ultrathin g-C3N4 nanosheets
• Photocatalysis

Although photocatalytic degradation is an ideal strategy for cleaning environmental pollution, it remains challenging to construct a highly efficient photocatalytic system by steering the charge flow in a precise manner. In this study, a novel atomic scale g-C3N4/Bi2WO6 heterojunction (UTCB) constructed by ultrathin g-C3N4 nanosheets (ug-CN) and monolayer Bi2WO6 nanosheets (m-BWO) was successfully prepared by hydrothermal reaction. The UTCB heterojunctions were characterized by various techniques including XRD, TEM, AFM, BET measurements, UV-vis spectrometry, and XPS. The results indicated that UTCB heterojunctions were assembly of m-BWO on ug-CN and presented high separation efficiency of photogenerated carriers. Under visible light irradiation, the optimum molar ratio of ug-CN/m-BWO (1:4, UTCB-25) reached almost 96.1% removal efficiency of IBF within 1 h, which was about 2.7 times as that of pure m-BWO. The photocatalytic mechanisms of UTCB-25 were revealed, suggesting that the synergistic effect of UTCB-25 heterojunction with strong interfacial interaction promoted the photoinduced charge separation. According to the LC-MS/MS, five photodegradation pathways of IBF under visible light irradiation were proposed. This study could open new opportunities for the rational design and a better understanding of atomic scale two dimensions/two dimensions (2D/2D) heterojunctions in environmental or other applications.

• 出版日期2017-7-15
• 单位湖南农业大学; 化学生物传感与计量学国家重点实验室; 湖南大学