Effect of synthesis strategies on morphology and antibacterial properties and photocatalytic activity of graphitic carbon nitride (g-C3N4).

Rojin Anbarteh, Maryam Aftabi-Khadar, Seyed Morteza Hosseini-Hosseinabad, Ashkan Seza, Soheil Rahmani Fard, Sara Minaeian
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Abstract

Different morphologies of graphitic carbon nitride (g-C3N4), including bulk g-C3N4(B-CN), ultrathin nanosheet g-C3N4(N-CN), and porous g-C3N4(P-CN) were synthesized through a facile one-step approach. They were then employed as efficient photocatalysts under visible light to degrade methylene blue and deactivateStaphylococcus aureus(S. aureus) andEscherichia coli(E. coli) bacteria. The synthesized powders were characterized using various industry standard techniques and field emission scanning electron microscopy (SEM) analysis successfully represented the various morphologies of g-C3N4. Furthermore, the antibacterial activities of synthesized samples were examined, and the results revealed that B-CN, N-CN, and P-CN powders could eliminate around 64%, 82%, and 99% ofE. coliunder visible light irradiation and about 30%, 56, and 67% in dark conditions. On the other hand, the bacterial reduction rate ofS. aureuswas approximately 61%, 74%, and 99% for B-CN, N-CN, and P-CN powders under visible light irradiation and about 38%, 60%, and 77% in dark conditions. The SEM analysis revealed that P-CN causedE. coliandS. aureusbacteria to rupture, completely separating their internal contents from the cell membrane. g-C3N4photocatalytic antibacterial agents can be utilized as a unique potential solution for nosocomial infection management.

合成策略对石墨氮化碳(g-C3N4)形貌、抗菌性能和光催化活性的影响
通过简单的一步法合成了不同形态的石墨化氮化碳(g- c3n4),包括块状g- c3n4 (B-CN)、超薄纳米片g- c3n4 (N -CN)和多孔g-C- 3N4(P-CN)。然后将它们用作可见光下的高效光催化剂,降解亚甲基蓝(MB)并使金黄色葡萄球菌(S. aureus)和大肠杆菌(E. coli)失活。采用各种工业标准技术和场发射扫描电镜(FE-SEM)对合成的粉末进行了表征,成功地表征了g-C3N4的各种形态。结果表明,B- CN、N -CN和P-CN粉末在可见光照射下对-大肠杆菌的去除率分别为64%、82%和99%,在黑暗条件下对-大肠杆菌的去除率分别为30%、56%和67%。另一方面,B-CN、N-CN和P-CN粉末在可见光下对金黄色葡萄球菌的细菌还原率分别为61%、74%和99%,在黑暗条件下对金黄色葡萄球菌的细菌还原率分别为38%、60%和77%。扫描电镜分析显示,P-CN导致大肠杆菌和金黄色葡萄球菌破裂,使其内部内容物与细胞膜完全分离。g-C3N4光催化抗菌剂可作为一种独特的潜在解决方案用于医院感染管理。
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