Environment and energy are two key issues in today's society. In terms of environmental protection, the treatment of phytoremediation residues has become a key problem to be solved urgently, while for energy storage, it tends to utilize low-cost and high specific energy storage materials (i.e. porous carbon). In this study, the phytoremediation residues is applied to the storage materials with low-cost and high specific capacity. Firstly, the phosphorous acid assisted pyrolysis of oilseed rape stems from phytoremediation is effective in the removal of Zn, Cu, Cd and Cr from the derived biochar. Moreover, the derived biochar from phytoremediation residues shows abundant porous structure and polar groups (-O/-P/-N), and it can deliver 650 mAh g(-1) with 3.0 mg cm(-2) (sulfur), and keeps 80 capacity after 200 cycles when employing it as a sulfur host for lithium-sulfur (Li-S) batteries. Hence, phosphorous acid assisted pyrolysis and application in Li-S battery is a promising approach for the disposal of phytoremediation residues, which is contributed to the environmental protection as well as energy storage.
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机译：环境和能源是当今社会的两个关键问题。在环境保护方面，植物修复残留物的处理已成为亟待解决的关键问题，而对于储能而言，则倾向于利用低成本、高比重的储能材料（即多孔碳）。本研究将植物修复残留物应用于低成本、高比容量的储存材料。首先，植物修复法对油菜籽进行磷酸辅助热解可有效去除衍生生物炭中的Zn、Cu、Cd和Cr。此外，从植物修复残留物中提取的生物炭表现出丰富的多孔结构和极性基团（-O/-P/-N），在3.0 mg cm（-2）（硫）下可提供650 mAh g（-1），并在200次循环后保持80%的容量，将其用作锂硫（Li-S）电池的硫基体。因此，磷酸辅助热解及其在锂硫电池中的应用是一种很有前途的植物修复残留物处理方法，有助于环境保护和储能。
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