Dual-Functional Ice/Water Interface Allows High-Yield Formation of Al<sub>13</sub> with Low Energy

Published on 2018-02-10T00:18:39Z (GMT) by
Keggin Al<sub>13</sub>[(AlO<sub>4</sub>Al<sub>12</sub>(OH)<sub>24</sub>(H<sub>2</sub>O)<sub>12</sub>]<sup>7+</sup> is a well-known efficient coagulant widely used in water purification and treatment. The production of high-content Al<sub>13</sub> is still costly, and it is therefore essential to develop new eco-efficient and low energy demand synthesis methods for practical application. Solid–water interfaces play a dominant role in heterogeneous reactions, which can be utilized in various processes through rationally designed interfaces. Here, we designed an Al<sup>3+</sup> and OH<sup>–</sup> interface by using NaOH-doped ice as a solid and AlCl<sub>3</sub> solution as liquid for Al<sub>13</sub> production. This system provides a natural and renewable solid–water interface through ice melting, while simultaneously minimizing external energy input and maintaining an effective heterogeneous interface reaction for production of high-quality Al<sub>13</sub> species. The dual-function of ice/water interface enables the formation of Al<sub>13</sub> with a high yield of up to 90% compared to initial total Al. Moreover, global areas with cold winter climate conditions may exploit this process reducing the need for external artificial energy. As AlCl<sub>3</sub> can be obtained with low cost, this method may have great potential for industrial mass production of Al<sub>13</sub>.

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Kuang, Liang; Li, Ning; Jefferson, William A.; Bai, Yaohui; Ji, Qinghua; Liu, Huijuan; et al. (2018): Dual-Functional Ice/Water Interface Allows High-Yield

Formation of Al13 with Low Energy. ACS Publications. Collection.