Department of Advanced Material Technologies, Faculty of Chemistry, Wrocław University of Science and Technology, Smoluchowskiego 25, 50-372 Wrocław, Poland.
Department of Analytical Chemistry and Chemical Metallurgy, Faculty of Chemistry, Wrocław University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wrocław, Poland.
Molecules. 2021 Nov 16;26(22):6917. doi: 10.3390/molecules26226917.
The aim of this study was to propose a complete approach for macroalgae biomass valorization into products useful for sustainable agriculture and environmental protection. In the first stage, the effects of macroalgal extracts and ZnO NPs (zinc oxide nanoparticles) on the germination and growth of radish were examined. Macroalgal extract was produced from freshwater macroalga, i.e., by ultrasound assisted extraction (UAE). The extract was used to biosynthesize zinc oxide nanoparticles. In germination tests, extracts and solutions of ZnO NPs were applied on paper substrate before sowing. In the second stage, sorption properties of macroalga, post-extraction residue, and ZnO NPs to absorb Cr(III) ions were examined. In the germination tests, the highest values of hypocotyl length (the edible part of radish), i.e., 3.3 and 2.6 cm were obtained for 60 and 80% extract (among the tested concentrations 20, 40, 60, 80, and 100%) and 10 and 50 mg/L NPs, respectively. The highest sorption capacity of Cr(III) ions (344.8 mg/g) was obtained by both macroalga and post-extraction residue at a pH of 5 and initial Cr(III) ions concentration of 200 mg/L. This study proves that macroalgae and products based on them can be applied in both sustainable agriculture and wastewater treatment.
本研究旨在提出一种完整的方法，将大型藻类生物质转化为有益于可持续农业和环境保护的产品。在第一阶段，研究了大型藻类提取物和 ZnO NPs（氧化锌纳米粒子）对萝卜种子萌发和生长的影响。大型藻类提取物是由淡水大型藻类，通过超声辅助提取（UAE）制备的。该提取物用于生物合成氧化锌纳米粒子。在萌发试验中，在播种前将提取物和 ZnO NPs 溶液施加在纸基质上。在第二阶段，研究了大型藻类、提取后残渣和 ZnO NPs 对 Cr(III)离子的吸附性能。在萌发试验中，60%和 80%提取物（在 20、40、60、80 和 100%的测试浓度中）以及 10 和 50 mg/L NPs 分别获得了最长的下胚轴长度（萝卜的可食用部分），即 3.3 和 2.6 cm。在 pH 值为 5 和初始 Cr(III)离子浓度为 200 mg/L 时，大型藻类和提取后残渣对 Cr(III)离子的最大吸附容量分别为 344.8 mg/g。本研究证明，大型藻类及其衍生产品可应用于可持续农业和废水处理。
