Abstract
In order to control the cyanobacterial blooms in eutrophic water, an Ag/AgCl@ZIF-8 floating coating was prepared by a dip-coating method with a sponge, innovatively employed as a carrier for the removal of algae in natural water samples. The as-prepared photocatalyst was characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (SEM). The effects of this Ag/AgCl@ZIF-8 coating on algal removal and phytoplankton community structure in natural water samples with cyanobacterial blooms were investigated under sunlight. Results showed that Ag/AgCl@ZIF-8 distributed uniformly on the surface of the coating with good stability and algae removal efficiency in water bodies. After 6 h of exposure under sunlight, the chlorophyll a in the natural water samples was degraded by 99.9%, the densities of Microcystis aeruginosa were reduced by 92.6% and the densities and biomass of the other algae decreased by about 80%. Meanwhile, the content of colored dissolved organic matter (CDOM) in the samples was decreased, effectively controlling the cyanobacterial blooms. It was found that O2•− played the main role in the photocatalytic inactivation. In conclusion, the Ag/AgCl@ZIF-8 coating has a promising application potential for the removal of harmful cyanobacteria, and provides a new idea for the control of cyanobacterial blooms in water bodies.
Highlights
With the acceleration of urbanization and industrialization, eutrophication and climate change are causing a global increase in the frequency and severity of harmful cyanobacterial blooms [1]
These results suggested that the Ag/AgCl@ZIF-8 coating can sunlight
The results show that the Ag/AgCl@ZIF-8 coating could alleviate the problem of algal bloom by reducing the proportion in phytoplankton under sunlight
Summary
With the acceleration of urbanization and industrialization, eutrophication and climate change are causing a global increase in the frequency and severity of harmful cyanobacterial blooms [1]. Numerous techniques have been proposed to control cyanobacterial blooms, including physical [5,6], chemical [7,8] and biological methods [9,10]. The application of photocatalysis has been studied in controlling cyanobacterial blooms. Photocatalysis is the acceleration of a chemical reaction stimulated by light with the aid of a photocatalyst, which is usually a semiconductor [11]. The dispersion grade of semiconductors and the catalyst or support presents an influence on reaction efficiency and band gap [12]
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