Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, 200093 Shanghai, PR China; Interdisciplinary Nanoscience Center (iNANO), Sino-Danish Center for Education and Research (SDC), Aarhus University, DK-8000 Aarhus C, Denmark.
Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, 200093 Shanghai, PR China.
J Colloid Interface Sci. 2020 Mar 15;563:336-346. doi: 10.1016/j.jcis.2019.12.021. Epub 2019 Dec 9.
Polymer graphitic carbon nitride (g-CN) materials have attracted growing interest owing to their impressive applicability in photocatalysis and optoelectronic devices. However, further applications of g-CN materials are greatly restricted by their chemical inertness and insolubility in most solvents. Regarding the rising prospect of g-CN nanosheets in the biomedicalfield, high solubility and biocompatibility are required for the further development of g-CN materials. In this study, a simple one-step thermal polymerization method was designed to prepare fast-soluble mesoporous g-CN nanosheets by using NHHSO as the critical adjuvant. The products, especially the optimal g-CN NSs-4, showed impressive solubility, biocompatibility and partial biodegradability. The enriched surface hydrophilic groups (-NH and -OH) may contribute to improving the solubility of g-CN nanosheets, while the partial biodegradability can be ascribed to the presence of the disulfide bond in the g-CN framework. In this system, the NHHSO adjuvant acted not only as O and S sources, but also as a bubbling agent that endows the g-CN a porous structure with greatly enlarged specific surface area and high separation efficiency of photogenerated electron-hole pairs. These integrative positive factors also greatly contributed to the photocatalytic activity of the g-CN nanosheets. This facile, economic and general fabrication strategy for mesoporous, fast-soluble and biocompatible g-CN with superior visible-light photocatalytic activity is promising in environmental, energy and biomedical fields.
聚合物石墨相氮化碳 (g-CN) 材料由于其在光催化和光电设备中的应用潜力而受到越来越多的关注。然而，g-CN 材料的进一步应用受到其化学惰性和在大多数溶剂中不溶的极大限制。鉴于 g-CN 纳米片在生物医学领域的应用前景，g-CN 材料的进一步发展需要高溶解度和生物相容性。在本研究中，设计了一种简单的一步热聚合方法，使用 NHHSO 作为关键助剂来制备快速溶解的介孔 g-CN 纳米片。所得产物，特别是最佳的 g-CN NSs-4，表现出令人印象深刻的溶解度、生物相容性和部分可生物降解性。丰富的表面亲水性基团 (-NH 和 -OH) 可能有助于提高 g-CN 纳米片的溶解度，而部分可生物降解性可归因于 g-CN 框架中存在二硫键。在该体系中，NHHSO 助剂不仅充当 O 和 S 源，而且还充当鼓泡剂，赋予 g-CN 多孔结构，极大地增加了比表面积和光生电子空穴对的高效分离。这些综合的积极因素也极大地促进了 g-CN 纳米片的光催化活性。这种简便、经济且通用的制备策略可用于制备具有优越可见光光催化活性的介孔、快速溶解和生物相容的 g-CN，有望在环境、能源和生物医学领域得到应用。
