Graphene and g-C3N4 Nanosheets Cowrapped Elemental 伪-Sulfur As a Novel Metal-Free Heterojunction Photocatalyst for Bacterial Inactivation under Visible-Light

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• 作者：Wanjun Wang ; Jimmy C. Yu ; Dehua Xia ; Po Keung Wong ; Yecheng Li
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2013
• 出版时间：August 6, 2013
• 年：2013
• 卷：47
• 期：15
• 页码：8724-8732
• 全文大小：419K
• 年卷期：v.47,no.15(August 6, 2013)
• ISSN：1520-5851

文摘

A new class of metal-free heterojunction photocatalysts was prepared by wrapping reduced graphene oxide (RGO) and g-C₃N₄ (CN) sheets on crystals of cyclooctasulfur (伪-S₈). Two distinctive structures were fabricated by wrapping RGO and CN sheets in different orders. The first was RGO sheets sandwiched in heterojunction of CN sheets and 伪-S₈ (i.e., CNRGOS₈), while the second structure was the other way around (i.e., RGOCNS₈). Both structures exhibited antibacterial activity under visible-light irradiation. CNRGOS₈ showed stronger bacterial inactivation than RGOCNS₈ in aerobic conditions. However, RGOCNS₈ was more active than CNRGOS₈ under anaerobic condition. A possible mechanism was proposed to explain the differences between photocatalytic oxidative inactivation and reductive inactivation. As a proof-of-concept, this work could offer new inroads into exploration and utilization of graphene sheets and g-C₃N₄ sheets cowrapped nanocomposites for environmental applications.