Glycomics and Glycan Bioengineering Research Center, College of Food Science & Technology, Nanjing Agricultural University, Nanjing, P. R. China.
J Sci Food Agric. 2021 May;101(7):2930-2939. doi: 10.1002/jsfa.10925. Epub 2020 Nov 21.
Porphyra 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 of lead (Pb), cadmium (Cd), chromium (Cr), arsenic (As), and copper (Cu) from P. haitanensis for the first time, and the adsorption mechanism of NADESs was also studied.
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. Moreover, 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.
Taken together, a green and efficient method for removing heavy metals from P. haitanensis was established. © 2020 Society of Chemical Industry.
坛紫菜目前面临严重的重金属污染问题。天然深共晶溶剂（NADESs）已被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 作为洗脱剂，用于去除坛紫菜中的铅（Pb）、镉（Cd）、铬（Cr）、砷（As）和铜（Cu），并研究了 NADESs 的吸附机制。
与对照相比，NADESs 大大提高了去除率，Pb、Cd、Cr、As 和 Cu 的去除率分别为 17.4-87.54%、57.54-100%、9.8-48.59%、21.32-78.24%和 11.68-79.73%。最佳条件为水含量 10%，固液比 1:20。此外，添加 20%天然表面活性剂阿拉伯胶可以进一步提高 NADESs 去除重金属的效率。吸附机制实验表明，准二级模型和 Freundlich 吸附模型可以更好地解释 NADESs 对重金属去除的吸附机制。
综上所述，建立了一种从坛紫菜中去除重金属的绿色高效方法。© 2020 英国化学学会。
