Collage of Food Science, Guangdong Pharmaceutical University, Zhongshan 528458, China.
Collage of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China.
Molecules. 2023 May 5;28(9):3897. doi: 10.3390/molecules28093897.
Natural astaxanthin has been widely used in the food, cosmetic, and medicine industries due to its exceptional biological activity. Shrimp shell is one of the primary natural biological sources of astaxanthin. However, after astaxanthin recovery, there is still a lot of chitin contained in the residues. In this study, the residue from shrimp () shells after astaxanthin extraction using ionic liquid (IL) 1-ethyl-3-methyl-imidazolium acetate ([Emim]Ac) was used as a bioadsorbent to remove fluoride from the aqueous solution. The results show the IL extraction conditions, including the solid/liquid ratio, temperature, time, and particle size, all played important roles in the removal of fluoride by the shrimp shell residue. The shrimp shells treated using [Emim]Ac at 100 °C for 2 h exhibited an obvious porous structure, and the porosity showed a positive linear correlation with defluorination (, %). Moreover, the adsorption process of fluoride was nonspontaneous and endothermic, which fits well with both the pseudo-second-order and Langmuir models. The maximum adsorption capacity calculated according to the Langmuir model is 3.29 mg/g, which is better than most bioadsorbents. This study provides a low-cost and efficient method for the preparation of adsorbents from shrimp processing waste to remove fluoride from wastewater.
天然虾青素因其出色的生物活性而被广泛应用于食品、化妆品和医药行业。虾壳是虾青素的主要天然生物来源之一。然而，在虾青素回收后，残渣中仍含有大量的壳聚糖。在本研究中，使用离子液体（IL）1-乙基-3-甲基-咪唑醋酸盐（[Emim]Ac）提取虾青素后的虾壳残渣被用作生物吸附剂，以去除水溶液中的氟化物。结果表明，IL 萃取条件，包括固液比、温度、时间和粒径，都对虾壳残渣去除氟化物起着重要作用。用[Emim]Ac 在 100°C 下处理 2 小时的虾壳呈现出明显的多孔结构，并且孔隙率与除氟率呈正线性相关（，%）。此外，氟化物的吸附过程是自发的和吸热的，这与伪二阶和朗缪尔模型都很好地拟合。根据朗缪尔模型计算的最大吸附容量为 3.29mg/g，优于大多数生物吸附剂。本研究为利用虾加工废物制备吸附剂去除废水中的氟化物提供了一种低成本、高效的方法。
