Honghui Guo,Jie Zhang,Jian Gao,Ziyu Liang,Wei Li,Hong Yan,Ruijie Guo,Huifang Wang
Carbon quantum dots (CQDs) were prepared by top-down hydrothermal method by corn stalks as a carbon source. The CQDs were composited with titanium dioxide (TiO 2 ) to improve its antibacterial properties under visible light. The prepared nanocomposites were characterized by UV–Vis, EA, PL, TEM, XRD, FT-IR and XPS. PL analysis showed that the prepared CQDs had good upconversion fluorescence properties. FTIR and XPS demonstrated that the CQDs were successfully loaded onto the surface of TiO 2 , which were connected by C-O-Ti bonds. Finally, the effect of CQDs on the photocatalytic and antimicrobial properties of TiO 2 was evaluated.
To enhance the phosphate removal performance, a porous material (La MOF-20 %-C) was prepared by selectively removing the thermally unstable NH 2 -BDC ligand from a lanthanum dual organic ligand MOF through pyrolysis. This innovative approach equips La-MOF-20 %-C with dual functionalities: high phosphate adsorption capacity and robust antibacterial effects. The adsorbent showcased a remarkable phosphate adsorption capacity of 97.24 mg P/g and reached equilibrium within 90 min. The material exhibits good anti-interference capability, and the presence of multiple coexisting ions does not affect its adsorption performance. Additionally, it can be used over a wide pH range (3.0–8.0) and has good reusability. Mechanistic studies indicated that electrostatic attraction and ligand exchange were the primary mechanisms for phosphate adsorption. Moreover, La MOF-20 %-C effectively inhibited the metabolic activities of Escherichia coli and Staphylococcus aureus through phosphorus starvation and electrostatic attraction, demonstrating significant antibacterial properties. Importantly, the fabrication of this material into a filter membrane enabled the successful treatment of 16.8 L of actual wastewater, achieving an overall phosphate removal rate of over 85 %, and effectively removing total bacteria. These findings highlight La MOF-20 %-C as a highly promising material with dual functionality for phosphate removal and bacterial inhibition.
Zhihao Lin,Jiaojiao Jia,Chengzhi Liang,Yueyan Ma,Hao Liu,Kuanjun Fang,Yanling Hu
Wounds in diabetic patients are often inhibited in angiogenesis and extracellular matrix synthesis due to insufficient oxygen supply, leading to prolonged healing time. Although oxygen therapy has been shown to promote the healing of chronic wounds, its therapeutic effectiveness remains limited by high costs, complex procedures, and a lack of sustainability. In this study, we developed an aerogel composed of chitosan (CS), sodium alginate (SA), and calcium peroxide (CPO). These aerogels can absorb wound exudate and release oxygen upon contact, providing continuous oxygen delivery for over five days. The freeze-dried aerogels are soft and exhibit shape recovery properties, which facilitate enhanced oxygen transport. Furthermore, the CS/SA-CPO aerogel demonstrated strong antioxidant activity, excellent biocompatibility, and potent antibacterial properties (exceeding 99.99 %). In vivo experiments indicated that the CS/SA-CPO aerogel promotes wound healing by continuously releasing oxygen, accelerating collagen deposition, and enhancing re-epithelialization, ultimately achieving 99.65 % wound closure within 21 days. This innovative approach offers a promising strategy for managing chronic, hypoxic diabetic wounds.
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