Department of Chemistry, University of Kerala, Kariavattom Campus, Thiruvananthapuram, Kerala 695 581, India.
ACS Appl Bio Mater. 2021 Apr 19;4(4):3332-3349. doi: 10.1021/acsabm.0c01652. Epub 2021 Apr 6.
Recently, TiO crystals have been modified by transition-metal dopants with different physicochemical structures to attain distinguished properties. Considering the similar ionic sizes of V (0.058 nm) and Ti (0.061 nm), vanadium in the +4 state can be effectively incorporated into the crystal lattice of TiO to tune the band gap energy by creating an impurity energy level (V/V) below the conduction band (2.1 eV) and retaining the anatase phase. In vanadium-incorporated TiO (V/TiO), V is a good dopant candidate as it can increase the lifetime of the charge carrier and reduce the electron-hole recombination rate, which results in high antibacterial activity under visible light irradiation. The present study explores the V/TiO-based hot-dip zinc coating with enhanced electrochemical properties and long-term stability for combating biocorrosion. All the composites and the coatings are characterized by different techniques, including X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, energy-dispersive X-ray analysis, confocal laser scanning microscopy, optical surface profilometry, and X-ray photoelectron spectroscopy. The biofilm formation assay and the cell viability assay reveal that the tuned composition of the V/TiO-based hot-dip zinc coating effectively kills the adherent bacteria and inhibits biofilm formation on the surface. The high-charge-transfer resistance (225.67, 223.63, and 242.35 Ω cm) and the high-inhibition efficiency (92.24, 92.30, and 92.02%) of the tuned composition of the V/TiO-based hot-dip zinc coating confirm its efficient and sustainable antibiocorrosion performance and long-term stability even after an exposure period of 21 days in different bacterial environments. With the inherent antibacterial properties and antibiocorrosion performance of the developed V/TiO-based hot-dip zinc coating, the mild steel substrates can find potential application in different fields, including aquatic and marine environments.
最近，通过过渡金属掺杂剂对 TiO 晶体进行了改性，以获得具有显著性能的晶体。考虑到 V（0.058nm）和 Ti（0.061nm）的离子半径相似，+4 价的钒可以有效地掺入 TiO 晶格中，通过在导带（2.1eV）以下创建一个杂质能级（V/V）来调整带隙能，并保持锐钛矿相。在掺钒 TiO（V/TiO）中，V 是一种很好的掺杂剂候选物，因为它可以增加载流子的寿命并降低电子-空穴复合率，从而在可见光照射下具有高抗菌活性。本研究探讨了具有增强的电化学性能和长期稳定性的基于 V/TiO 的热浸镀锌涂层，以对抗生物腐蚀。所有的复合材料和涂层都通过不同的技术进行了表征，包括 X 射线衍射、透射电子显微镜、场发射扫描电子显微镜、能量色散 X 射线分析、共聚焦激光扫描显微镜、光学表面轮廓仪和 X 射线光电子能谱。生物膜形成试验和细胞活力试验表明，基于 V/TiO 的热浸镀锌涂层的调谐组成能有效地杀死附着的细菌并抑制表面的生物膜形成。高电荷转移电阻（225.67、223.63 和 242.35Ωcm）和高抑制效率（92.24、92.30 和 92.02%）表明，调谐组成的基于 V/TiO 的热浸镀锌涂层具有高效、可持续的抗生物腐蚀性能和长期稳定性，即使在不同的细菌环境中暴露 21 天后也是如此。具有内在抗菌性能和抗生物腐蚀性能的开发的 V/TiO 基于热浸镀锌涂层，中碳钢基材在包括水和海洋环境在内的不同领域都有潜在的应用。
