A novel flocculation strategy for simultaneously removing Microcystis aeruginosa and algal organic matter (AOM) was proposed using chitosan-amphoteric starch (C-A) dual flocculants in an efficient, cost-effective and ecologically friendly way, providing new insights for harmful algal blooms (HABs) control. A dual-functional starch-based flocculant, amphoteric starch (AS) with high anion degree of substitution (DS_A) and cation degree of substitution (DS_C), was prepared using a cationic moiety of 3-chloro-2-hydroxypropyltrimethylammonium chloride (CTA) coupled with an anion moiety of chloroacetic acid onto the backbone of starch simultaneously. In combination of the results of FTIR, XPS, ¹H NMR, ¹³C NMR, GPC, EA, TGA and SEM, it was evidenced that the successfully synthesized AS with excellent structural characteristics contributed to the enhanced flocculation of M. aeruginosa. Furthermore, the novel C-A dual flocculants could achieve not only the removal of >99.3 % of M. aeruginosa, but also the efficacious flocculation of algal organic matter (AOM) at optimal concentration of (0.8:24) mg/L, within a wide pH range of 3–11. The analysis of zeta potential and cellular morphology revealed that the dual effects of both enhanced charge neutralization and notable netting-bridging played a vital role in efficient M. aeruginosa removal.

提出了一种使用壳聚糖-两性淀粉 (CA) 双絮凝剂以高效、经济且生态友好的方式同时去除铜绿微囊藻和藻类有机物 (AOM) 的新型絮凝策略，为有害藻华 (HAB) 提供了新见解控制。_使用阳离子部分 3-氯-2-羟丙基三甲基氯化铵₍ CTA) 与氯乙酸的阴离子部分同时偶联到淀粉主链上。结合 FTIR、XPS、¹ H NMR、¹³C NMR、GPC、EA、TGA 和 SEM，证明成功合成的具有优异结构特征的 AS 有助于增强铜绿假单胞菌的絮凝作用。此外，新型 CA 双絮凝剂不仅可以去除 >99.3% 的铜绿假单胞菌，而且可以在最佳浓度 (0.8:24) mg/L 下有效絮凝藻类有机物 (AOM)，范围很广pH 值范围为 3–11。zeta 电位和细胞形态学分析表明，增强的电荷中和和显着的网状桥接的双重效应在有效去除铜绿假单胞菌中起着至关重要的作用。