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Turning waste into treasure: Reuse of contaminant-laden adsorbents (Cr(vi)-Fe3O4/C) as anodes with high potassium-storage capacity.
Journal of Colloid and Interface Science ( IF 9.9 ) Pub Date : 2020-09-08 , DOI: 10.1016/j.jcis.2020.08.110
Ji Ma 1 , Chunting Liu 2
Affiliation  

In this study, we try to find possible solutions to synchronously solving energy and environmental problems. In our design, orange peel is used as a carbon source to synthesize low-cost Fe3O4/C composites, which are employed as adsorbents to purify Cr(vi)-contaminated water. After that, these Cr(vi)-laden Fe3O4/C composites are used and tested as anodes in potassium-ion batteries. It is found that their K-storage capacity is more than 300 mAh g−1 at a current density of 0.1 A g−1, depending on the mass content of Fe3O4. The more Fe3O4 component in composite, the more adsorbed Cr(vi) species through chemisorption, and the larger K-storage capacity. The good electrical conductivity of cabon-based anodes endows them with superior rate performance. At current densities of 0.1, 0.5, 1 and 2 A g−1, K-storage capacity amounts to 357.8, 316.3, 276.3 and 236.8 mAh g−1, respectively. The reuse of contaminant-laden adsorbents as anodes will shed new light on the disposal of exhausted adsorbents after water treatment and development of anode materials for secondary batteries.



中文翻译:

变废为宝:重复使用负载有污染物的吸附剂(Cr(vi)-Fe3O4 / C)作为具有高钾存储能力的阳极。

在这项研究中,我们尝试找到同步解决能源和环境问题的可能解决方案。在我们的设计中,桔皮被用作碳源来合成低成本的Fe 3 O 4 / C复合材料,该复合材料被用作吸附剂以净化被Cr(vi)污染的水。之后,使用这些负载Cr(vi)的Fe 3 O 4 / C复合材料作为钾离子电池的阳极进行测试。发现根据Fe 3 O 4的质量含量,它们在0.1 A g -1的电流密度下的K存储容量大于300 mAh g -1。更多的Fe 3 O 4在复合物中的Cr(vi)组分中,通过化学吸附作用吸附的Cr(vi)种类更多,并且钾存储容量更大。碳基阳极的良好电导率赋予它们优异的倍率性能。在0.1、0.5、1和2 A g -1的电流密度下,K储存容量分别为357.8、316.3、276.3和236.8 mAh g -1。在水处理和开发用于二次电池的阳极材料之后,将充满污染物的吸附剂再用作阳极将为处理耗尽的吸附剂提供新的思路。

更新日期:2020-09-14
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