Development of antibacterial bioactive Ti metal with light environment responsiveness

金属钛经NaOH、NH4OH和热处理后浸泡在模拟体液（SBF）中，体外形成磷灰石，而NaOH、HNO3和热处理后浸泡在SBF中则没有。经过NaOH、NH4OH和加热处理后的Ti金属表面形成的锐钛矿型TiO2沉淀和/或细小的网状结构可能是导致金属表面磷灰石形成的原因。NaOH、NH4OH和热处理均可在Ti金属表面生成氮掺杂TiO2，且经过NaOH、NH4OH和热处理的Ti金属样品中亚甲基蓝（MB）的浓度比未处理和NaOH和热处理的Ti金属样品降低得更多。这一初步结果表明，经过NaOH、NH4OH和热处理的Ti金属在可见光下具有光催化活性的潜力。

Ti metal treated with NaOH, NH4OH, and heat and then soaked in simulated body fluid (SBF) showed in vitro apatite formation whereas that treated with NaOH, HNO3, and heat and then soaked in SBF did not. The anatase TiO2 precipitate and/or the fine network structure formed on the surface of the Ti metal treated with NaOH, NH4OH, and heat and then soaked in SBF might be responsible for the formation of apatite on the surface of the metal. The NaOH, NH4OH, and heat treatments might produce nitrogen-doped TiO2 on the surface of the Ti metal, and the concentration of methylene blue (MB) in the Ti metal sample treated with NaOH, NH4OH, and heat decreased more than in the untreated and NaOH- and heat-treated ones. This preliminary result suggests that Ti metal treated with NaOH, NH4OH, and heat has the potential to show photocatalytic activity under visible light.