Department of Chemical Engineering, R&D Center for Membrane Technology and Luh Hwa Research Center for Circular Economy, Chung Yuan Christian University, Taoyuan 32023, Taiwan.
Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Ube, Yamaguchi 7550097, Japan.
J Colloid Interface Sci. 2020 May 1;567:202-212. doi: 10.1016/j.jcis.2020.02.017. Epub 2020 Feb 6.
In this study, an S-doped g-CN nanosheet was prepared as a photocatalyst for effective oxygen evolution reaction. Sulfur plays a crucial role in S-doped g-CN not only in increasing the charge density but also in reducing the energy band gap of S-doped g-CN via substitution of nitrogen sites. S-doped g-CN can serve as an oxygen-evolved photocatalyst, when combined with Ru/SrTiO:Rh in the presence of [Co(bpy)] as an electron mediator, enables photocatalytic overall water splitting under visible light irradiation with hydrogen and oxygen production rates of 24.6 and 14.5 μmol-h, respectively. Moreover, the photocatalytic overall water splitting to produce H and O using this Z-scheme system could use for five runs to at least 94.5 h under visible light irradiation. On the other hand, S-doped g-CN can reduce biofouling by bacteria such as Escherichia coli by more than 70%, by simply incubating the S-doped g-CN sample with bacterial solution under light irradiation. Our results suggest that S-doped g-CN is a potentially effective, green, and promising material for a variety of photocatalytic applications.
在这项研究中，制备了一种 S 掺杂 g-CN 纳米片作为光催化剂，用于有效进行氧气析出反应。硫在 S 掺杂 g-CN 中起到了关键作用，不仅通过氮位取代来增加电荷密度，还降低了 S 掺杂 g-CN 的能带隙。S 掺杂 g-CN 可以作为析氧光催化剂，当与 Ru/SrTiO:Rh 结合并在 [Co(bpy)] 作为电子介体的存在下，可在可见光照射下进行光催化全水分解，分别产生 24.6 和 14.5 μmol-h 的氢气和氧气生成速率。此外，使用这种 Z 型体系通过可见光照射进行光催化全水分解来产生 H 和 O，可以在至少 94.5 h 内进行五次运行。另一方面，S 掺杂 g-CN 可以通过简单地将 S 掺杂 g-CN 样品与细菌溶液在光照下孵育，将细菌引起的生物污垢减少 70%以上。我们的研究结果表明，S 掺杂 g-CN 是一种具有多种潜在应用的有效、绿色、有前景的光催化材料。
