Inactivation of Microcystis aeruginosa by peroxydisulfate activated with single‐atomic iron catalysis: Efficiency and mechanisms. Issue 5 (October 2022)

• Record Type: Journal Article
• Authors: Zhang, Hangjun; Yu, Bingzhi; Li, Xizi; Li, Yan; Zhong, Yuchi; Ding, Jiafeng
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 5(2022)
• Publication Date: 2022-10
• Subjects: Microcystis aeruginosa -- Microcystin-LR -- Peroxydisulfate -- Reactive oxygen species; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.108310
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Harmful algal blooms caused by cyanobacteria in drinking water have posed serious threats to destroy aquatic ecosystems, and the toxins they produce are harmful to human and animal health. Herein, the feasibility of removing Microcystis aeruginosa ( M. aeruginos ) and microcystin-LR ( MC-LR ) by free radicals produced by simple-atomic iron-doped g-C3 N4 (Fe-g-C3 N4 )-activated peroxydisulfate (PDS) was studied. Pristine g-C3 N4 and three kinds of Fe-g-C3 N4 with different compositions were successfully synthesized and characterized. When the initial algae density was 2.5 × 10 6 cells·mL −1, approximately 96.25 % of M. aeruginosa cells were inactivated with 2.0 g·L −1 Fe-g-C3 N4 and 4.0 mM PDS under the conditions of pH 7.0, and MC-LR could also be effectively degraded. The activated system can effectively remove M. aeruginosa, and MC-LR was evaluated for its morphological characteristics, cell membrane integrity and microcystin degradation. In addition to the widely recognized reaction species (SO4 − and OH), singlet oxygen ( 1 O2 ) was another predominant radical for destroying the cell structure and removing MC-LR . The materials can be well recycled, and a possible removal mechanism was proposed. This work shows that the Fe-g-C3 N4 -activated PDS system is an environmentally friendly and efficient technology for algae removal and algal toxin reduction. Graphical Abstract: ga1 Highlights: Single‐atomic iron catalysts were successfully synthesized and characterized. OH, SO4 − and 1 O2 played the dominant roles in the higher removal of M. aeruginosa . The leaked organic matters can be removed in the inactivation process. The materials were well recycled, and a possible removal mechanism was proposed.