| Citation: |
LUAN Jingmin, SONG Tingting, SUN Haifeng, et al. Preparation and photocatalytic performance of polyvinyl alcohol /oxygen-doped carbon nitride composite nanofiber films[J]. Acta Materiae Compositae Sinica, 2025, 42(4): 1945-1957. DOI: 10.13801/j.cnki.fhclxb.20240718.001
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A large number of organic pollutants caused serious pollution to the water cycle, and drug-resistant bacteria posed a serious threat to human health. Photocatalytic nanomaterials have become a research hotspot in the field of antibacteria. In this paper, oxygen-doped carbon nitride (O-CN) was prepared by hot polymerization with urea and formic acid. The optimal proportion of O-CN was mixed with polyvinyl alcohol (PVA) solution, and the PVA/O-CN composite nanofiber film was successfully prepared by electrospinning technology. The micro-morphology, structure, photocatalytic bacteriostatic properties and organic pollutant removal properties of O-CN and PVA/O-CN composite films were studied. The results show that O atom can replace the N position in the triazine ring structure of CN, and the light absorption capacity and the separation rate of electron-hole improve compared with that of CN. PVA/O-CN-0.6 composite nanofiber membrane has the best inhibition effect on E. coli and S. aureus, and the inhibition rates are 96% and 93.7%, respectively. In addition, PVA/O-CN-0.6 composite nanofiber membrane has a good performance in dye removal, and the removal rate of methylene blue (MB) by PVA/O-CN-0.6 reaches 97.7% within 4 h. Moreover, the film with excellent mechanical properties, has great application potential in many fields.
A large number of organic pollutants caused serious pollution to the water cycle, and at the same time, drug-resistant bacterium produced by the overuse antibiotics posed a serious threat to human health. Photocatalytic nanomaterials have become a research hotspot in the field of antibacterial because of broad spectrum and low energy consumption. Here, graphite phase carbon nitride (CN) was selected as a photocatalytic material, the flexible nanofiber catalysts were prepared by oxygen doping and electrospinning. The applications of photocatalytic removal of organic pollutants and bacteriostatic properties were explored.
A series of Oxygen-doped carbon nitride (O-CN) were obtained by using formic acid and urea by heat polymerization, and then combined with polyvinyl alcohol (PVA) solution, polyvinyl alcohol/oxygen-doped carbon nitride (PVA/O-CN) composite nanofiber membranes were prepared by electrospinning method. The morphology characteristics of O-CN and PVA/O-CN were observed by SEM and TEM, the structural characteristics of O-CN were studied by XRD, FT-IR and XPS, the optical properties of O-CN were investigated by PL and UV-vis, and the mechanical properties of PVA/O-CN were investigated by stress-strain test. Taking MB as the model pollutant, the photocatalytic removal of organic pollutants and recycling performance were analyzed and discussed. and the bacteriostatic ability of O-CN and PVA/O-CN composite nanofiber membrane against and under visible light irradiation were studied. The species and relative intensity of ROS in O-CN and PVA/O-CN were studied by electron spin resonance free radical trapping method. The principle of photocatalytic performance of PVA/O-CN may be as follows: under visible light, O-CN surface absorbs light energy, excises electron transition, generates electron-hole pair and separates. Photogenerated carriers can redox with O and HO on the catalyst surface to produce ROS (、、), which act on MB molecules and bacteria through nanofiber.
Through the test results of the above methods and the data analysis, it was found that the porous structure and lamellar structure of O-CN were more than that of CN. By analyzing the structure characteristics of O-CN and CN, O element may replace the position of N in the triazine ring structure of CN, and the defects increased. The visible light absorption capacity and electron-hole separation rate of O-CN were improved comparing with that of CN. The diameter of PVA/O-CN nanofibers increased with the increase of oxygen content. The removal rate of MB from PVA/O-CN-0.6 composite nanofiber membrane was above 95%, and no significant deactivation was observed after 5 cycles. The inhibition rate of PVA/O-CN composite nanofiber membrane against and were 96%and 93.7%, respectively.Conclusions: The photocatalytic removal of methylene blue (MB) and the photocatalytic bacteriostatic ability of PVA/O-CN nanofiber membranes were significantly improved. In particular, the PVA/O-CN-0.6 composite membrane can remove 97.7% of MB under the action of adsorption and photocatalysis in the experimental range. PVA/O-CN-0.6 composite membrane had the best inhibition effect on and , with maximum inhibition diameters of 24.36±0.15 mm and 20.48±0.35 mm, respectively, and the inhibition rates for and reached 96% and 93.7%. It was confirmed by ESR test that ROS was produced under photoexcitation, and ROS was the key factor to improve the antibacterial performance and photocatalytic removal efficiency. It also provided a possible bacteriostatic mechanism. It can be predicted that PVA/O-CN nanofiber membranes can be used in a variety of fields including but not limited to healthcare, food packaging and handling, household goods, medical beauty and other fields.
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