Organic iron at ultralow doses catalyzes hydrogen peroxide to eliminate cyanobacterial blooms: a study on algicidal effects and mechanisms under natural conditions
Hydrogen peroxide (H2O2) is gaining recognition as an eco-friendly and highly effective algicide for combating cyanobacterial blooms. This study investigates the algicidal potential of H2O2 catalyzed by both inorganic and organic iron. Our findings indicate that inorganic iron (FeSO4) shows minimal...
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Frontiers Media S.A.
2025-01-01
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| Series: | Frontiers in Environmental Engineering |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fenve.2024.1516999/full |
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| author | Yongdong Lin Ziru Niu Juan Li Sijin Li Hai Li Lei Li |
| author_facet | Yongdong Lin Ziru Niu Juan Li Sijin Li Hai Li Lei Li |
| author_sort | Yongdong Lin |
| collection | DOAJ |
| description | Hydrogen peroxide (H2O2) is gaining recognition as an eco-friendly and highly effective algicide for combating cyanobacterial blooms. This study investigates the algicidal potential of H2O2 catalyzed by both inorganic and organic iron. Our findings indicate that inorganic iron (FeSO4) shows minimal catalytic activity on H2O2 under varying light conditions. In contrast, organic iron, specifically the combination of H2O2, EDTANaFe, and light irradiation, demonstrates significant algicidal effects. The optimal dosages were identified as 10 mg/L for H2O2 and 3 mg/L for Fe3+.The limited efficacy of inorganic iron stems from the transformation of Fe2+ to Fe3+ ions via the Fenton reaction. Under neutral conditions, Fe3+ ions precipitate as large-sized goethite, which adheres to the extracellular polymeric substances (EPS) of cyanobacterial cells, thereby hindering H2O2 catalysis and hydroxyl radical (·OH) formation in natural waters. Conversely, the combination of light radiation and organic iron salts greatly enhances the algicidal efficiency of H2O2. This synergy accelerates H2O2 decomposition and facilitates the production of a substantial amount of OH radicals by altering the Gibbs free energy. Thus, bright and sunny conditions, particularly in the afternoon, are crucial for effectively combating cyanobacterial blooms using Fenton-like reagents. The methodology presented in this study offers a viable solution to global cyanobacteria bloom issues and elucidates the mechanisms driving its efficacy. |
| format | Article |
| id | doaj-art-ce938dfc2ac94091a8e7bf2b6c8c1398 |
| institution | Kabale University |
| issn | 2813-5067 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Environmental Engineering |
| spelling | doaj-art-ce938dfc2ac94091a8e7bf2b6c8c13982025-01-06T06:59:11ZengFrontiers Media S.A.Frontiers in Environmental Engineering2813-50672025-01-01310.3389/fenve.2024.15169991516999Organic iron at ultralow doses catalyzes hydrogen peroxide to eliminate cyanobacterial blooms: a study on algicidal effects and mechanisms under natural conditionsYongdong Lin0Ziru Niu1Juan Li2Sijin Li3Hai Li4Lei Li5Kweichow Moutai Winery (Group) Health Wine Co., Ltd, Renhuai, ChinaShaanxi Provincial Land Engineering Construction Group, Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Natural Resources, Xi’an, ChinaShaanxi Provincial Land Engineering Construction Group, Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Natural Resources, Xi’an, ChinaShool of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, ChinaChina Construction Third Engineering Bureau Second Construction Engineering Co., Ltd, Wuhan, ChinaKweichow Moutai Winery (Group) Health Wine Co., Ltd, Renhuai, ChinaHydrogen peroxide (H2O2) is gaining recognition as an eco-friendly and highly effective algicide for combating cyanobacterial blooms. This study investigates the algicidal potential of H2O2 catalyzed by both inorganic and organic iron. Our findings indicate that inorganic iron (FeSO4) shows minimal catalytic activity on H2O2 under varying light conditions. In contrast, organic iron, specifically the combination of H2O2, EDTANaFe, and light irradiation, demonstrates significant algicidal effects. The optimal dosages were identified as 10 mg/L for H2O2 and 3 mg/L for Fe3+.The limited efficacy of inorganic iron stems from the transformation of Fe2+ to Fe3+ ions via the Fenton reaction. Under neutral conditions, Fe3+ ions precipitate as large-sized goethite, which adheres to the extracellular polymeric substances (EPS) of cyanobacterial cells, thereby hindering H2O2 catalysis and hydroxyl radical (·OH) formation in natural waters. Conversely, the combination of light radiation and organic iron salts greatly enhances the algicidal efficiency of H2O2. This synergy accelerates H2O2 decomposition and facilitates the production of a substantial amount of OH radicals by altering the Gibbs free energy. Thus, bright and sunny conditions, particularly in the afternoon, are crucial for effectively combating cyanobacterial blooms using Fenton-like reagents. The methodology presented in this study offers a viable solution to global cyanobacteria bloom issues and elucidates the mechanisms driving its efficacy.https://www.frontiersin.org/articles/10.3389/fenve.2024.1516999/fullfenton-like regentorganic ironfree radicalcyanobacterial bloomEDTANaFe |
| spellingShingle | Yongdong Lin Ziru Niu Juan Li Sijin Li Hai Li Lei Li Organic iron at ultralow doses catalyzes hydrogen peroxide to eliminate cyanobacterial blooms: a study on algicidal effects and mechanisms under natural conditions Frontiers in Environmental Engineering fenton-like regent organic iron free radical cyanobacterial bloom EDTANaFe |
| title | Organic iron at ultralow doses catalyzes hydrogen peroxide to eliminate cyanobacterial blooms: a study on algicidal effects and mechanisms under natural conditions |
| title_full | Organic iron at ultralow doses catalyzes hydrogen peroxide to eliminate cyanobacterial blooms: a study on algicidal effects and mechanisms under natural conditions |
| title_fullStr | Organic iron at ultralow doses catalyzes hydrogen peroxide to eliminate cyanobacterial blooms: a study on algicidal effects and mechanisms under natural conditions |
| title_full_unstemmed | Organic iron at ultralow doses catalyzes hydrogen peroxide to eliminate cyanobacterial blooms: a study on algicidal effects and mechanisms under natural conditions |
| title_short | Organic iron at ultralow doses catalyzes hydrogen peroxide to eliminate cyanobacterial blooms: a study on algicidal effects and mechanisms under natural conditions |
| title_sort | organic iron at ultralow doses catalyzes hydrogen peroxide to eliminate cyanobacterial blooms a study on algicidal effects and mechanisms under natural conditions |
| topic | fenton-like regent organic iron free radical cyanobacterial bloom EDTANaFe |
| url | https://www.frontiersin.org/articles/10.3389/fenve.2024.1516999/full |
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