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Atomic scale g-C3N4/Bi2WO6 2D/2D heterojunction with enhanced photocatalytic degradation of ibuprofen under visible light irradiation
Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2017-03-26 09:04:39
Jiajia Wang, Lin Tang, Guangming Zeng, Yaocheng Deng, Yani Liu, Longlu Wang, Yaoyu Zhou, Zhi Guo, Jingjing Wang, Chen Zhang

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 1h, 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.

中文翻译:

在可见光照射下具有增强的布洛芬光催化降解能力的原子级g-C3N4 / Bi2WO6 2D / 2D异质结

尽管光催化降解是清除环境污染的理想策略,但是通过精确控制电荷流来构建高效的光催化系统仍然具有挑战性。在这项研究中,由超薄gC 3 N 4纳米片(ug-CN)和单层Bi 2 WO 6构成的新型原子级gC 3 N 4 / Bi 2 WO 6异质结(UTCB)。通过水热反应成功制备了纳米片(m-BWO)。UTCB异质结的特征在于多种技术,包括XRD,TEM,AFM,BET测量,紫外可见光谱和XPS。结果表明,UTCB异质结是m-BWO在ug-CN上的组装体,具有较高的光生载流子分离效率。在可见光照射下,ug-CN / m-BWO的最佳摩尔比(1:4,UTCB-25)在1小时内达到了IBF的近96.1%的去除效率,约为纯m-BWO的2.7倍。揭示了UTCB-25的光催化机理,表明UTCB-25异质结与强界面相互作用的协同作用促进了光诱导的电荷分离。根据LC–MS / MS,提出了可见光照射下IBF的5个光降解途径。这项研究可以为在环境或其他应用中合理设计和更好地理解二维/二维(2D / 2D)异质结的原子尺度开辟新的机会。
更新日期:2017-03-26
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