School of Petrochemical Engineering & Environment, Zhejiang Ocean University, Zhoushan 316000, China; Eastern Institute of Technology, Ningbo 315200, China.
Centre for Water, Energy and Waste, Harry Butler Institute, Murdoch University, Murdoch, WA 6150, Australia.
Bioresour Technol. 2023 Dec;390:129860. doi: 10.1016/j.biortech.2023.129860. Epub 2023 Oct 12.
Magnetic flocculation which uses magnetic particles is an emerging technology for harvesting microalgae. However, the potential modification and use of cost-effective and sustainable biochar-based composites is still in its infancy. As such, this study aimed to compare the harvesting efficiency of peanut shell biochar (BC), biochar modified with FeCl (FeBC), and biochar dual-modified with chitosan and FeCl (CTS@FeBC) on microalgae. The results showed CTS@FeBC exhibited significantly higher microalgae harvesting efficiency compared to BC and FeBC. Both acidic and alkaline conditions were favorable for harvesting microalgae by CTS@FeBC. At pH 2 and pH 12, the harvesting efficiency reached 96.9% and 98.8% within 2 min, respectively. The primary adsorption mechanism of CTS@FeBC on microalgae mainly involved electrostatic attraction and sweeping flocculation. Furthermore, CTS@FeBC also showed good biocompatibility and reusability. This study clearly demonstrated a promising technique for microalgae harvesting using biochar-based materials, offering valuable insights and potential applications in sustainable bioresource management.
磁絮凝技术利用磁性颗粒是一种新兴的微藻收获技术。然而，基于成本效益和可持续性的生物炭基复合材料的潜在改性和应用仍处于起步阶段。因此，本研究旨在比较花生壳生物炭 (BC)、用 FeCl 改性的生物炭 (FeBC) 和用壳聚糖和 FeCl 双重改性的生物炭 (CTS@FeBC) 对微藻的收获效率。结果表明，与 BC 和 FeBC 相比，CTS@FeBC 表现出更高的微藻收获效率。在酸性和碱性条件下，CTS@FeBC 均有利于微藻的收获。在 pH 2 和 pH 12 下，分别在 2 分钟内达到 96.9%和 98.8%的收获效率。CTS@FeBC 对微藻的主要吸附机制主要涉及静电吸引和扫集絮凝。此外，CTS@FeBC 还表现出良好的生物相容性和可重复使用性。本研究清楚地展示了一种使用基于生物炭的材料收获微藻的有前途的技术，为可持续生物资源管理提供了有价值的见解和潜在应用。
