Recyclable and Intrinsically Anti‐cyanobacterial Polyanionic Membranes

Abstract

Cyanobacteria blooms possess serious threats to water resources. Herein, we report the synthesis of polyanionic membranes (PA-M) by in situ photo-crosslinking of a sulfate-based anionic monomer followed by cation-exchange with metal cations, Fe (PA-Fe), Cu (PA-Cu), or Zn (PA-Zn). The effect of cations on the anti-cyanobacterial activities against both Microcystis aeruginosa (M. aeruginosa) and Anabaena flos-aquae (A. flos-aquae) was investigated. All the prepared metal-containing membranes (PA-Fe, PA-Cu, PA-Zn) exhibit high anti-cyanobacterial activities and long-term anti-cyanobacterial stability, demonstrating that the synthesized PA-M membranes can be used as an effective and safe inhibitor to control cyanobacterial blooms.

Self-Immolative Polythiophene for Sunlight Inactivation of Harmful Cyanobacteria

“…Due to the fast adsorption of algae by PT10, the dark flocculation could slightly accelerate photoinactivation (Figure S10). In addition, PT10 only could also result in a small degree of algae death, probably because of the strong electrostatic interaction (Figure C), while for methylene blue (MB, a positively charged PS and previously used for M. aeruginosa removal), the survival rate of M.…”

“…Due to the fast adsorption of algae by PT10, the dark flocculation could slightly accelerate photoinactivation (Figure S10). In addition, PT10 only could also result in a small degree of algae death, probably because of the strong electrostatic interaction (Figure 1C), 39 while for methylene blue (MB, a positively charged PS and previously used for M. aeruginosa removal 40 ), the survival rate of M. aeruginosa remained ∼50% after irradiation for 4 h, and more than 30% of M. aeruginosa could survive after 6 h of irradiation. Most importantly, upon direct recultivation of the above-treated products for 10 days, the PT10-treated water remained clean, but appreciable regrowth of algal cells was found in the MB-treated samples (Figure 1D), indicating that the residue amount of algae in PT10treated water was much smaller than that of the MB-treated case.…”