Faculty of Applied Chemistry and Materials Science, University Polytechnica of Bucharest, 1-7 Polizu, 011061, Bucharest, Romania.
National Research & Development Institute for Non-Ferrous and Rare Metals, 102 Biruintei Blvd., 077145, Pantelimon, Jud Ilfov, Romania.
Environ Sci Pollut Res Int. 2020 Feb;27(4):4450-4459. doi: 10.1007/s11356-019-06839-8. Epub 2019 Dec 12.
The aim of this study was the valorization of titanium flakes (waste) from titanium and titanium alloy ingot production factories and using in applications related to metals recovery as retention bed for some trace metals. The titanium flakes were anodized for surface nanostructuration with TiO nanotubes and then annealed in order to increase the surface stability. The nanostructured titanium flakes were loaded and pressed in a retention column linked with inductively coupled plasma spectrometer (ICP-OES). This system allowed determination of trace elements such as beryllium, lanthanum, lutetium, and ytterbium from sample solutions. Beryllium recovery percentage was over 90%, while lanthanides have just a satisfactory recovery percentage (about 65% Yb and Lu and 50% La). The TiO nanotube architecture was not affected during utilization being able to perform for a long time. A thermodynamic and kinetic study was done for beryllium due to its successful adsorption recovery percentage. The obtained results showed that the titanium waste is a promising material for rare earth and relatively rare earth elements retention and recovery. Graphical abstract Graphical abstract.
本研究的目的是利用钛和钛合金锭生产厂的废钛片，并将其应用于与金属回收相关的领域，作为某些痕量金属的保留床。将钛片进行阳极氧化处理，在表面形成 TiO 纳米管，然后进行退火处理，以提高表面稳定性。将纳米结构的钛片装入保留柱中，并与电感耦合等离子体光谱仪（ICP-OES）相连。该系统允许从样品溶液中测定铍、镧、镥和镱等痕量元素。铍的回收率超过 90%，而镧系元素的回收率仅为 65%（Yb 和 Lu）和 50%（La）。TiO 纳米管结构在使用过程中没有受到影响，能够长时间运行。由于铍的吸附回收效果良好，对其进行了热力学和动力学研究。所得结果表明，钛废料是一种很有前途的材料，可用于稀土和相对稀土元素的保留和回收。
