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首页> 外文期刊>RSC Advances >Hydrothermal synthesis and adsorption behavior of H4Ti5O12 nanorods along [100] as lithium ion-sieves
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Hydrothermal synthesis and adsorption behavior of H4Ti5O12 nanorods along [100] as lithium ion-sieves

机译：H4Ti5O12纳米棒沿[100]作为锂离子筛的水热合成及吸附行为

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摘要

The adsorption method is a promising route to recover Li ~(+) from waste lithium batteries and lithium-containing brines. To achieve this goal, it is vital to synthesize a stable and high adsorption capacity adsorbent. In this work, Li _(4) Ti _(5) O _(12) nanorods are prepared by two hydrothermal processes followed by a calcination process. Then the prepared Li _(4) Ti _(5) O _(12) nanorods are treated with different HCl concentrations to obtain a H _(4) Ti _(5) O _(12) adsorbent with 5 μm length along the [100] direction. The maximum amount of extracted lithium can reach 90% and the extracted titanium only 2.5%. The batch adsorption experiments indicate that the H _(4) Ti _(5) O _(12) nanorod maximum adsorption capacity can reach 23.20 mg g ~(?1) in 24 mM LiCl solution. The adsorption isotherms and kinetics fit a Langmuir model and pseudo-second-order model, respectively. Meanwhile, the real adsorption selectivity experiments show that the maximum Li ~(+) adsorption capacity reaches 1.99 mmol g ~(?1) , which is far higher than Mg ~(2+) (0.03 mmol g ~(?1) ) and Ca ~(2+) (0.02 mmol g ~(?1) ), implying these nanorods have higher adsorption selectivity for Li ~(+) from Lagoco Salt Lake brine. The adsorption capacity for Li ~(+) remains 91% after five cycles. With the help of XPS analyses, the adsorption mechanism of Li ~(+) on the H _(4) Ti _(5) O _(12) nanorods is an ion exchange reaction. Therefore, this nanorod adsorbent has a potential application for Li ~(+) recovery from aqueous lithium resources.
机译：吸附方法是从废锂电池和含锂盐水中回收Li〜（+）的有希望的途径。为实现这一目标，合成稳定和高吸附容量吸附剂至关重要。在这项工作中，Li _（4）Ti _（5）o _（12）纳米棒由两个水热过程制备，然后进行煅烧过程。然后用不同的HCl浓度处理制备的Li _（4）Ti _（5）o o _（12）烷段，得到H _（4）Ti _（5）O _（12）的吸附剂，其具有5μm的长度[100]方向。最大提取的锂量可达到90％，萃取的钛仅为2.5％。批量吸附实验表明H _（4）Ti _（5）O _（12）纳米棒在24mM LiCl溶液中可以达到23.20mg g〜（α1）。吸附等温线和动力学分别适用于Langmuir模型和伪二阶模型。同时，真正的吸附选择性实验表明，最大Li〜（+）吸附能力达到1.99mmol g〜（α1），远远高于Mg〜（2+）（0.03mmol g〜（？1））和Ca〜（2+）（0.02mmol g〜（α1）），暗示这些纳米杆具有来自Lagoco Salt Lake盐水的Li〜（+）的吸附选择性较高。 5个循环后Li〜（+）的吸附能力仍然是91％。在XPS分析的帮助下，H _（4）Ti _（5）O _（12）×（12）纳米棒的Li〜（+）的吸附机理是离子交换反应。因此，该纳米棒吸附剂具有从锂锂水溶液中恢复Li〜（+）的潜在应用。

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