BACKGROUND Porphyra haitanensis (P. haitanensis) now faces serious heavy metal pollution problems. Natural deep eutectic solvents (NADESs) have been recognized as a novel class of sustainable solvents, which can be used for heavy metal removal. In this study, 28 kinds of NADESs were prepared and investigated as eluent in the removal on Pb, Cd, Cr, As, Cu from P. haitanensis for the first time, and the adsorption mechanism of NADESs was also studied. RESULTS The removals were greatly improved by NADESs compared with control where the removal rates of Pb, Cd, Cr, As and Cu were 17.4%-87.54%, 57.54%-100%, 9.8%-48.59%, 21.32%-78.24% and 11.68%-79.73%, respectively. The optimal condition was 10% water content and solid-liquid ratio of 1:20. In addition, the addition of 20% natural surfactant arabic gum can further increase the heavy metals removal rates of NADESs. The adsorption mechanism experiments showed that the Pseudo second-order model and the Freundlich adsorption model can better explain the adsorption mechanism of NADESs on heavy metals removal. CONCLUSION Taken together, a green and efficient method for removing heavy metals from P. haitanensis was established. This article is protected by copyright. All rights reserved.

中文翻译：

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使用天然深共熔溶剂绿色高效去除紫菜中的重金属

背景技术海坦紫菜（P. haitanensis）目前面临着严重的重金属污染问题。天然低共熔溶剂 (NADES) 已被公认为是一类新型的可持续溶剂，可用于去除重金属。本研究首次制备了28种NADESs作为淋洗剂对海坦松中Pb、Cd、Cr、As、Cu的去除，并对NADESs的吸附机理进行了研究。结果与对照相比，NADESs的去除率显着提高，其中Pb、Cd、Cr、As和Cu的去除率为17.4%-87.54%、57.54%-100%、9.8%-48.59%、21.32%-78.24%和分别为 11.68%-79.73%。最佳条件为含水量为10%，固液比为1:20。此外，添加20%的天然表面活性剂阿拉伯胶可以进一步提高NADESs的重金属去除率。吸附机理实验表明，伪二阶模型和Freundlich吸附模型可以更好地解释NADESs对重金属去除的吸附机理。结论 综上所述，建立了一种绿色、高效的去除海坦紫檀中重金属的方法。本文受版权保护。版权所有。