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首页> 外文期刊>Environmental Science & Technology >Graphene and g-C_3N_4 Nanosheets Cowrapped Elemental α-Sulfur As a Novel Metal-Free Heterojunction Photocatalyst for Bacterial Inactivation under Visible-Light
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Graphene and g-C_3N_4 Nanosheets Cowrapped Elemental α-Sulfur As a Novel Metal-Free Heterojunction Photocatalyst for Bacterial Inactivation under Visible-Light

机译：石墨烯和g-C_3N_4纳米片包裹的元素α-硫作为新型无金属异质结光催化剂，用于可见光下的细菌灭活

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摘要

A new class of metal-free heterojunction photo-catalysts was prepared by wrapping reduced graphene oxide (RGO) and g-C_3N_4 (CN) sheets on crystals of cyclooctasulfur (α-S_8). 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 α-S_8 (i.e., CNRGOS_8), while the second structure was the other way around (i.e., RGOCNS_8). Both structures exhibited antibacterial activity under visible-light irradiation. CNRGOS_8 showed stronger bacterial inactivation than RGOCNS_8 in aerobic conditions. However, RGOCNS_8 was more active than CNRGOS_8 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-C_3N_4 sheets cowrapped nanocomposites for environmental applications.
机译：通过将还原后的氧化石墨烯（RGO）和g-C_3N_4（CN）薄片包裹在环八硫（α-S_8）晶体上，制备了一类新型的无金属异质结光催化剂。通过将RGO和CN片材以不同顺序包裹，可以制造出两种独特的结构。第一种是夹在CN片和α-S_8（即CNRGOS_8）异质结中的RGO片，而第二种结构则相反（即RGOCNS_8）。两种结构在可见光照射下均表现出抗菌活性。在有氧条件下，CNRGOS_8表现出比RGOCNS_8更强的细菌灭活作用。然而，在厌氧条件下，RGOCNS_8比CNRGOS_8更具活性。提出了一种可能的机理来解释光催化氧化失活和还原失活之间的差异。作为概念验证，这项工作可能为石墨烯薄板和g-C_3N_4薄板包裹纳米复合材料的环保应用提供新的探索和利用。

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  • 来源
    《Environmental Science & Technology》 |2013年第15期|8724-8732|共9页
  • 作者

    Wanjun Wang; Jimmy C. Yu; Dehua Xia; Po Keung Wong; Yecheng Li;

  • 作者单位

    Department of Chemistry and Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Shatin,N.T., Hong Kong, China;

    Department of Chemistry and Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Shatin,N.T., Hong Kong, China;

    School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China;

    School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China;

    Department of Chemistry and Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Shatin,N.T., Hong Kong, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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