Hebei Short Process Steelmaking Technology Innovation Center, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China.
State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100049, China.
Molecules. 2024 Sep 4;29(17):4192. doi: 10.3390/molecules29174192.
Graphitic carbon nitride (g-CN, CN) has emerged as a promising photocatalytic material due to its inherent stability, antibacterial properties, and eco-friendliness. However, its tendency to aggregate and limited dispersion hinder its efficacy in practical antibacterial applications. To address these limitations, this study focuses on developing a composite hydrogel coating, in which sodium alginate (SA) molecules interact electrostatically and through hydrogen bonding to anchor CN, thereby significantly improving its dispersion. The optimal CN loading of 35% results in a hydrogel with a tensile strength of 120 MPa and an antibacterial rate of 99.87% within 6 h. The enhanced mechanical properties are attributed to hydrogen bonding between the -NH2 groups of CN and the -OH groups of SA, while the -OH groups of SA facilitate the attraction of photogenerated holes from CN, promoting carrier transfer and separation, thereby strengthening the antibacterial action. Moreover, the hydrogel coating exhibits excellent antibacterial and corrosion resistance capabilities against Pseudomonas aeruginosa on 316L stainless steel (316L SS), laying the foundation for advanced antimicrobial and anticorrosion hydrogel systems.
石墨相氮化碳（g-CN，CN）因其固有稳定性、抗菌性能和环保性而成为一种很有前途的光催化材料。然而，其团聚倾向和有限的分散性阻碍了其在实际抗菌应用中的功效。为了解决这些限制，本研究专注于开发一种复合水凝胶涂层，其中海藻酸钠（SA）分子通过静电和氢键相互作用来固定 CN，从而显著提高其分散性。最佳的 CN 负载量为 35%，可得到一种水凝胶，其拉伸强度为 120 MPa，在 6 h 内的抗菌率达到 99.87%。增强的机械性能归因于 CN 的 -NH2 基团和 SA 的 -OH 基团之间的氢键，而 SA 的 -OH 基团促进了来自 CN 的光生空穴的吸引，促进了载流子的转移和分离，从而增强了抗菌作用。此外，水凝胶涂层在 316L 不锈钢（316L SS）上对铜绿假单胞菌表现出优异的抗菌和耐腐蚀性能，为先进的抗菌和耐腐蚀水凝胶系统奠定了基础。
