[Algaecidal effect of a nanomaterial sheet]

Area of Science:

• Environmental Science
• Materials Science
• Aquatic Ecology

Background:

• Algal blooms pose significant threats to aquatic ecosystems and water resources.
• Effective and environmentally safe algaecidal treatments are crucial for managing water quality.
• Development of advanced materials for targeted algal control is an active research area.

Purpose of the Study:

• To develop and evaluate a nanomaterial algaecidal sheet for controlling various algal species.
• To assess the efficacy of the nanomaterial algaecidal sheet in both laboratory and field conditions.
• To determine the environmental safety of the nanomaterial algaecidal sheet, particularly concerning aquatic life.

Main Methods:

• Preparation of a novel nanomaterial algaecidal sheet.
• Laboratory experiments assessing algaecidal activity against Microcystis aeruginosa, Anabaena 7120, Euglena gracilis, Chlamydomonas reinhardtii, and Navicula incerta.
• Field experiments conducted at Wuli Lake to evaluate performance in a natural algal bloom scenario.
• Acute fish toxicity tests (5 days) to assess environmental impact.

Main Results:

• Significant reductions in cell density for multiple algal species were observed in laboratory tests.
• Chlorophyll a (Chla) concentration decreased by 18.7% for Navicula incerta in lab conditions.
• A 76% reduction in Chla concentration was achieved in a field algal bloom at Wuli Lake within 1 day.
• The nanomaterial algaecidal sheet exhibited no significant acute toxicity to fish over a 5-day exposure period.

Conclusions:

• The nanomaterial algaecidal sheet is a highly effective agent for reducing algal populations.
• The material demonstrates broad-spectrum algaecidal activity against diverse freshwater and marine algae.
• The demonstrated lack of fish toxicity supports its potential for safe application in environmental water management.