North University of China, School of Energy and Power Engineering, School of Materials Science and Engineering, Xueyuan Road 3, Taiyuan 030051, China.
Dalton Trans. 2018 May 8;47(18):6435-6443. doi: 10.1039/c8dt00735g.
A favorable interface for hybrid photocatalysts makes an important contribution in enhancing photocatalytic reactions. Herein we located sulfur and nitrogen co-doped carbon dots (SN-CDs) onto g-C3N4 nanosheets and achieved a novel SN-CD/g-C3N4 composite with a high visible-light photocatalytic reduction of 4-nitrophenol (4-NP). Compared to g-C3N4 nanosheets, the SN-CD/g-C3N4 composite possessed a wider light absorption. More importantly, the interaction of surface groups led to a favorable interfacial bonding between SN-CDs and g-C3N4 nanosheets, which facilitated the transfer of photoexcited electrons and holes, giving rise to an improved electron transport ability of the composite. In addition, the upward shift of the energy band of g-C3N4 nanosheets due to the location of SN-CDs led to a stronger reducibility of charge carriers. As a consequence, the photocatalytic performance of SN-CD/g-C3N4 has been remarkably improved in the photocatalytic reduction of 4-nitrophenol.
有利的杂化光催化剂界面在增强光催化反应中起着重要作用。在此，我们将硫和氮共掺杂碳点 (SN-CDs) 定位在 g-C3N4 纳米片上，得到了一种具有高光催化还原 4-硝基苯酚 (4-NP) 性能的新型 SN-CD/g-C3N4 复合材料。与 g-C3N4 纳米片相比，SN-CD/g-C3N4 复合材料具有更宽的光吸收范围。更重要的是，表面基团的相互作用导致 SN-CDs 和 g-C3N4 纳米片之间形成有利的界面键合，促进了光生电子和空穴的转移，从而提高了复合材料的电子输运能力。此外，由于 SN-CDs 的定位，g-C3N4 纳米片的能带向上移动，导致载流子的还原能力更强。因此，SN-CD/g-C3N4 的光催化性能在光催化还原 4-硝基苯酚中得到了显著提高。
