Titanium oxide nanoparticles such as anatase and rutile are widely used materials with relevance to commercial products, medical implants, and industry. Beyond some concern about nanotoxicity, the consensus about these nanoparticles is that they are insoluble in the aqueous environment, and therefore, their biological role is largely overlooked. However, Ti nanoparticles could be significantly activated via interactions with avid Ti ligands, and this study primarily focuses on their bioavailable nature in the environment. We used the hydroxamic acid siderophore desferrioxamine B (DFOB), which binds with Ti and can solubilize otherwise inert Ti from Ti-bearing minerals. In this study, we aim to understand Ti aqueous chemistry in the presence of this siderophore ligand DFOB and as a function of pH. UV-vis and ICP-OES are used to quantify mobile Ti concentration upon dissolution at different pH values. ESI-MS is used to identify the Ti(IV)-DFOB complexes. The surface interaction between DFOB and Ti nanoparticles is monitored by SEM and TEM, which is insightful about Ti nanoparticle surface remodeling. Furthermore, in situ ATR-FTIR spectroscopy is also used to study the DFOB and Ti-related vibrational spectra during their interaction. These experimental data primarily suggest Ti could be bioavailable when influenced by this bacterial siderophore and could participate in the geochemical cycles of aqueous environments.

Siderophore promoted adhesion and dissolution of TiO<sub>2</sub> nanoparticles

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ACS Fall 2022

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Siderophore promoted adhesion and dissolution of TiO2 nanoparticles

Siderophore promoted adhesion and dissolution of TiO₂ nanoparticles