Rapid photocatalytic inactivation of E. coli by polyethyleneimine grafted O-doped g-C3N4: Synergetic effects of the boosted reactive oxygen species production and adhesion performance

Xing, Quanfeng; Zhang, Min; Xu, Xiuquan; Zhang, Bo; Duan, Ying; Wei, Yi; Wang, Jiahui; Li, Mingyang

doi:10.1016/j.apsusc.2021.151496

Cited by 19 publications

(8 citation statements)

References 58 publications

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“…where the value of n for PCN was 2 and Ag 2 S was 4, respectively [36,41]. As shown in figure 5(b), the E g values of PCN and Ag 2 S were calculated to be 2.64 and 0.98 eV.…”

Section: Characterization Of the As-prepared Compositesmentioning

confidence: 90%

Ag₂S nanoparticles anchored on P-doped g-C₃N₄: a novel 0D/2D p-n 2 heterojunction for superior photocatalytic inactivation of 3 multidrug-resistant E. coli

Yan¹,

Pingping²,

Jiang³

et al. 2022

Mater. Res. Express

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Photocatalytic inactivation has been proved to be an effective strategy to eliminate pathogenic bacteria in water. Herein, a novel 0D/2D p-n heterojunction of Ag2S-anchored P-doped g-C3N4 (Ag2S/PCN) were constructed by a simple two-step process coupling one-pot calcination and ultrasonic-assisted synthesis. The photocatalytic performance of as-prepared Ag2S/PCN composites was investigated by inactivating multidrug-resistant E. coli under visible light irradiation. The results indicated that Ag2S/PCN-5 possessed outstanding photocatalytic inactivation activity and superior stability, which could completely inactivate 7.0-log E. coli cells within 60 min. The enhanced photocatalytic activity of Ag2S/PCN-5 was mainly attributed to the elevated visible-light response and improved production and transfer of photoexcited charges. In addition, the free radicals trapping experiments results revealed that h+ and •O2− were predominantly responsible for the efficient inactivation activity. Finally, according to the 0D/2D structure and energy band configuration analysis, the enhanced p-n type heterojunction photocatalytic inactivation mechanism of Ag2S/PCN was discussed in detail.

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“…where the value of n for PCN was 2 and Ag 2 S was 4, respectively [36,41]. As shown in figure 5(b), the E g values of PCN and Ag 2 S were calculated to be 2.64 and 0.98 eV.…”

Section: Characterization Of the As-prepared Compositesmentioning

confidence: 90%

Ag₂S nanoparticles anchored on P-doped g-C₃N₄: a novel 0D/2D p-n 2 heterojunction for superior photocatalytic inactivation of 3 multidrug-resistant E. coli

Yan¹,

Pingping²,

Jiang³

et al. 2022

Mater. Res. Express

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“…57 Compared with O-g-C 3 N 4 , the photocurrent intensity of PCO nanofiber membranes was enhanced, which could be attributed to the electron transport effect of CS and the carrier transport facilitated by the porous structure of PCO nanofiber membranes. 53 Meanwhile, the photocurrent intensity of PCO nanofiber membrane was enhanced by increasing the O-g-C 3 N 4 content, which proved that the carrier separation efficiency was the highest in PCO/17%. The smallest EIS plot radius (Figure S4b) of the PCO/17% nanofiber membranes than O-g-C 3 N 4 indicated the lowest charge transport resistance and the highest photocatalytic carrier transport capacity from the interior to the surface, which was consistent with the photocurrent results.…”

Section: Performance Of the Pco Nanofiber Membranesmentioning

confidence: 90%

“…Previous studies showed that effective bacterial adsorption was a critical factor in improving sterilization rates. 53 Thus, the hydrophilicity of PCO nanofiber membranes was measured by contact angle measurements. As shown in Figure 4c, the contact angle decreased sequentially with the increase of O-g-C 3 N 4 from 55.0 ± 0.5 to 45.9 ± 0.2, indicating that the surface hydrophilicity of PCO was increased.…”

Section: Performance Of the Pco Nanofiber Membranesmentioning

confidence: 99%

Polyvinyl alcohol/chitosan nanofiber membranes loaded with oxygenated graphitic carbon nitride nanosheets for enhanced photocatalytic bacteriostasis

Bai

Song

Luan

et al. 2023

J of Applied Polymer Sci

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The visible light catalytic antibacterial nanofiber membranes as a novel functional material were designed to solve the problem of bacterial infection and water pollution. In this work, oxygenated graphite carbon nitride nanosheets (O‐g‐C3N4) with 12% oxygen content were synthesized through thermal polycondensation followed by chemical oxidation. Exfoliation and dispersion of O‐g‐C3N4 were strongly enhanced compared to pristine g‐C3N4 due to rich hydrophilic carboxyl and hydroxyl groups. The amount of ROS generated by O‐g‐C3N4 was about 13.8% more than that of g‐C3N4. Then, the polyvinyl alcohol (PVA)/chitosan (CS)/O‐g‐C3N4 (PCO) composite nanofiber membranes were prepared by electrospinning. The contact angle of the PCO nanofiber membranes decreased from 55.0° ± 0.5 to 45.9° ± 0.2 along with the increased amount of O‐g‐C3N4, indicating the improvement of hydrophilicity. Meanwhile, the diameter of nanofibers increased from 148.0 ± 22.9 nm to 244.0 ± 52.3 nm with the loading ratio from 0% to 17%. The PCO nanofiber membranes exhibited significantly higher antibacterial activity compared to the blank nanofiber membranes and bare O‐g‐C3N4. The maximum diameter of the inhibition zone against Escherichia coli and Staphylococcus aureus could reach 26 ± 0.1 mm and 16 ± 0.2 mm, respectively. The inhibition rate against E. coli could reach 97% in 24 h under the irradiation of simulated sunlight. Based on reactive oxygen species (ROS) testing, zeta potential, and bacterial inhibition experiments, a possible synergistic mechanism was proposed. The electrostatic adsorption effect of PCO nanofiber membranes and ROS could effectively decompose the organic components of bacteria and destroy their structural integrity. The results indicated that the antibacterial PCO composite nanofiber membranes have wide application prospects in biomedical‐related fields.

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“…Qi et al [ 35 ] prepared g-C 3 N 4 -based aerogels with different ratios of carboxymethyl cellulose and β-cyclodextrin, and they achieved a 97.99% removal of RhB within 90 min. Xing et al [ 36 ] reported that the prepared PEI/OCN had excellent rapid photocatalytic bactericidal ability, with an inactivation efficiency of 7.0 log CFU/mL against E. coli under visible light irradiation for 30 min. Hou et al [ 37 ] prepared PANI/g-C 3 N 4 composites with good photoanodic antifouling/antibacterial properties under visible light irradiation (96.5% and 95.3% killing of E. coli and S. aureus , respectively, after 30 min of visible light irradiation).…”

Section: Introductionmentioning

confidence: 99%

Chitosan-Grafted Carbon Oxynitride Nanoparticles: Investigation of Photocatalytic Degradation and Antibacterial Activity

et al. 2023

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In this work, a series of chitosan (CS)-grafted carbon oxynitride (OCN) nanoparticles (denoted as CS-OCN) were successfully synthesized for the first time by thermal polycondensation and subsequent esterification. The structure and photocatalytic performance of CS-OCN nanoparticles were investigated. The XPS spectra of CS-OCN-3 showed the presence of amino bonds. The optimal photocatalytic degradation efficiency of the synthesized CS-OCN-3 could reach 94.3% within 390 min, while the photocurrent response intensity was about 150% more than that of pure OCN. The improved photocatalytic performance may be mainly attributed to the enhanced photogenerated carrier’s separation and transportation and stronger visible light response after CS grafting. In addition, the inhibition diameter of CS-OCN-3 reached 23 mm against E. coli within 24 h under visible light irradiation, exhibiting excellent photocatalytic bactericidal ability. The results of bacterial inhibition were supported by absorbance measurements (OD600) studies of E. coli. In a word, this work provided a rational design of an efficient novel metal-free photocatalyst to remove bacterial contamination and accelerate the degradation of organic dyes.

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Rapid photocatalytic inactivation of E. coli by polyethyleneimine grafted O-doped g-C3N4: Synergetic effects of the boosted reactive oxygen species production and adhesion performance

Cited by 19 publications

References 58 publications

Ag₂S nanoparticles anchored on P-doped g-C₃N₄: a novel 0D/2D p-n 2 heterojunction for superior photocatalytic inactivation of 3 multidrug-resistant E. coli

Ag₂S nanoparticles anchored on P-doped g-C₃N₄: a novel 0D/2D p-n 2 heterojunction for superior photocatalytic inactivation of 3 multidrug-resistant E. coli

Polyvinyl alcohol/chitosan nanofiber membranes loaded with oxygenated graphitic carbon nitride nanosheets for enhanced photocatalytic bacteriostasis

Chitosan-Grafted Carbon Oxynitride Nanoparticles: Investigation of Photocatalytic Degradation and Antibacterial Activity

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Rapid photocatalytic inactivation of E. coli by polyethyleneimine grafted O-doped g-C3N4: Synergetic effects of the boosted reactive oxygen species production and adhesion performance

Cited by 19 publications

References 58 publications

Ag2S nanoparticles anchored on P-doped g-C3N4: a novel 0D/2D p-n 2 heterojunction for superior photocatalytic inactivation of 3 multidrug-resistant E. coli

Ag2S nanoparticles anchored on P-doped g-C3N4: a novel 0D/2D p-n 2 heterojunction for superior photocatalytic inactivation of 3 multidrug-resistant E. coli

Polyvinyl alcohol/chitosan nanofiber membranes loaded with oxygenated graphitic carbon nitride nanosheets for enhanced photocatalytic bacteriostasis

Chitosan-Grafted Carbon Oxynitride Nanoparticles: Investigation of Photocatalytic Degradation and Antibacterial Activity

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Resources

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Ag₂S nanoparticles anchored on P-doped g-C₃N₄: a novel 0D/2D p-n 2 heterojunction for superior photocatalytic inactivation of 3 multidrug-resistant E. coli

Ag₂S nanoparticles anchored on P-doped g-C₃N₄: a novel 0D/2D p-n 2 heterojunction for superior photocatalytic inactivation of 3 multidrug-resistant E. coli