水杨酸-壳聚糖复合微乳液的抑藻效应研究OA

To address the challenges of the low inhibition rate of algae-inhibiting substances in cyanobacterial bloom control,this study develops a salicylic acid-chitosan composite microemulsion(SA-CS)through functional synergy.Utilizing salicylic acid(SA)as an algicidal agent and chitosan(CS)as a bioflocculant,we aim to construct a dual-functional system capable of efficient flocculation and sustained algal inhibition,while systematically evaluating its inhibitory efficacy against Microcystis aeruginosa(M.aeruginosa)and regulatory mechanisms on microcystin-LR(MC-LR)release.The SA-CS,fabricated via a dissolution-reassembly method,achieves optimal SA encapsulation efficiency(50.60%)at an SA/CS mass ratio of 1∶1.It exhibits exceptional storage stability,showing no phase separation or significant particle aggregation after 21 days at 25℃.Dose-response experiments demonstrate that SA-CS achieves 80.91%flocculation removal of M.aeruginosa within 24 h at 40 mg/L(SA-equivalent dosage),with sustained growth inhibition reaching 48.35%after 14 days,significantly surpassing the performance of standalone SA treatment(p<0.01).Notably,SA-CS effectively mitigates MC-LR release risks,reducing the total intracellular and extracellular MC-LR by 23.48%compared to SA treatment.This study confirms the synergistic"rapid removal-sustained inhibition-toxin control"effects of SA-CS,offering an integrated solution for cyanobacterial bloom management.The findings advance the design of eco-friendly algicidal agents and provide critical insights for ecological restoration in eutrophic water bodies.