This study aimed to investigate the effect of pyrolysis on the stabilization of heavy metals in plant residues obtained after phytoremediation. Ramie residues, being collected after phytoremediation of metal contaminated sediments, were pyrolyzed at different temperatures (300–700 °C). Results indicated that pyrolysis was effective in the stabilization of Cd, Cr, Zn, Cu, and Pb in ramie residues by converting the acid-soluble fraction of metals into residual form and decreasing the TCLP-leachable metal contents. Meanwhile, the reutilization potential of using the pyrolysis products generated from ramie residues obtained after phytoremediation as sorbents was investigated. Adsorption experiments results revealed that the pyrolysis products presented excellent ability to adsorb methylene blue (MB) with a maximum adsorption capacity of 259.27 mg/g. This study demonstrated that pyrolysis could be used as an efficient alternative method for stabilizing heavy metals in plant residues obtained after phytoremediation, and their pyrolysis products could be reutilized for dye adsorption.

中文翻译：

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重金属污染沉积物植物修复后植物残留物的热解和再利用：用于重金属稳定和染料吸附


本研究旨在研究热解对植物修复后获得的植物残留物中重金属稳定性的影响。对金属污染沉积物进行植物修复后收集的苎麻残留物在不同温度（300-700°C）下热解。结果表明，热解通过将金属的酸溶部分转化为残留形式并降低TCLP可浸出金属含量，有效稳定苎麻残留物中的Cd、Cr、Zn、Cu和Pb。同时，研究了植物修复后获得的苎麻残渣热解产物作为吸附剂的再利用潜力。吸附实验结果表明，热解产物具有优异的吸附亚甲基蓝（MB）的能力，最大吸附容量为259.27 mg/g。这项研究表明，热解可以作为稳定植物修复后获得的植物残留物中重金属的有效替代方法，并且其热解产物可以重新用于染料吸附。