{"title":"利用可见光驱动的 BiOBrxI1-x/MFe2O4/g-C3N4(M = Co 和 Ni)可回收光催化剂抗击真核和原核有害藻类孳生","authors":"Anjitha A, Shijina Kottarathil, Ajayan KV, Sindhu Swaminathan, Irene M.C. Lo, Kishore Sridharan","doi":"10.1039/d4en00955j","DOIUrl":null,"url":null,"abstract":"Photocatalysis offers a promising avenue for completely mutilate harmful algal blooms (HABs), a significant threat to global freshwater reserves. In this study, a series of BiOBr<small><sub>x</sub></small>I<small><sub>1-x</sub></small> photocatalysts were synthesized and the most optimal catalyst was integrated with pristine g-C<small><sub>3</sub></small>N<small><sub>4</sub></small> and pre-synthesized CoFe<small><sub>2</sub></small>O<small><sub>4</sub></small>/g-C<small><sub>3</sub></small>N<small><sub>4</sub></small> and NiFe<small><sub>2</sub></small>O<small><sub>4</sub></small>/g-C<small><sub>3</sub></small>N<small><sub>4</sub></small> to form binary and ternary composite heterojunction photocatalysts (BiOBr<small><sub>0.95</sub></small>I<small><sub>0.05</sub></small>/g-C<small><sub>3</sub></small>N<small><sub>4</sub></small> - BG, CoFe<small><sub>2</sub></small>O<small><sub>4</sub></small>/BiOBr<small><sub>0.95</sub></small>I<small><sub>0.05</sub></small>/g-C<small><sub>3</sub></small>N<small><sub>4</sub></small> - CBG, and NiFe<small><sub>2</sub></small>O<small><sub>4</sub></small>/BiOBr<small><sub>0.95</sub></small>I<small><sub>0.05</sub></small>/g-C<small><sub>3</sub></small>N<small><sub>4</sub></small> - NBG). Synthesized photocatalysts were thoroughly characterized and their performance was evaluated through the visible light driven photocatalytic degradation of both Microcystis aeruginosa (prokaryotic) and Scenedesmus acuminatus (eukaryotic) algal cells sourced directly from ponds. Exceptional photocatalytic efficiency of CBG evidenced through the variation in chlorophyll-a content, malondialdehyde, and electrolytic leakage confirmed the complete rupture of the algal cells after 3 h of light exposure. This was further reconfirmed through fluorescent microscopy analysis and interestingly, both HABs failed to re-grow even after 10 days. Enhanced performance of CBG was attributed to the boosted generation of charge carriers facilitated by its extended visible light absorption, which in-turn produced reactive oxygen species (<small><sup>•</sup></small>O<small><sub>2</sub></small><small><sup>-</sup></small> and <small><sup>•</sup></small>OH radicals) that caused irreparable oxidative damage to algal cells, while effectively suppressing the exciton pair recombination supported by its double Z-scheme heterojunction. Furthermore, magnetic recyclability feature of CBG facilitated their easy removal from treated water for avoiding secondary pollution. Design of magnetically recyclable photocatalysts for degrading both prokaryotic and eukaryotic HABs demonstrated here is anticipated to inspire the development of efficient photocatalysts and design cost-effective solutions required for treating ponds and lakes infected with HABs.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":"18 1","pages":""},"PeriodicalIF":5.8000,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Combating Eukaryotic and Prokaryotic Harmful Algal Blooms with Visible-Light Driven BiOBrxI1-x/MFe2O4/g-C3N4 (M = Co & Ni) Recyclable Photocatalysts\",\"authors\":\"Anjitha A, Shijina Kottarathil, Ajayan KV, Sindhu Swaminathan, Irene M.C. Lo, Kishore Sridharan\",\"doi\":\"10.1039/d4en00955j\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Photocatalysis offers a promising avenue for completely mutilate harmful algal blooms (HABs), a significant threat to global freshwater reserves. In this study, a series of BiOBr<small><sub>x</sub></small>I<small><sub>1-x</sub></small> photocatalysts were synthesized and the most optimal catalyst was integrated with pristine g-C<small><sub>3</sub></small>N<small><sub>4</sub></small> and pre-synthesized CoFe<small><sub>2</sub></small>O<small><sub>4</sub></small>/g-C<small><sub>3</sub></small>N<small><sub>4</sub></small> and NiFe<small><sub>2</sub></small>O<small><sub>4</sub></small>/g-C<small><sub>3</sub></small>N<small><sub>4</sub></small> to form binary and ternary composite heterojunction photocatalysts (BiOBr<small><sub>0.95</sub></small>I<small><sub>0.05</sub></small>/g-C<small><sub>3</sub></small>N<small><sub>4</sub></small> - BG, CoFe<small><sub>2</sub></small>O<small><sub>4</sub></small>/BiOBr<small><sub>0.95</sub></small>I<small><sub>0.05</sub></small>/g-C<small><sub>3</sub></small>N<small><sub>4</sub></small> - CBG, and NiFe<small><sub>2</sub></small>O<small><sub>4</sub></small>/BiOBr<small><sub>0.95</sub></small>I<small><sub>0.05</sub></small>/g-C<small><sub>3</sub></small>N<small><sub>4</sub></small> - NBG). Synthesized photocatalysts were thoroughly characterized and their performance was evaluated through the visible light driven photocatalytic degradation of both Microcystis aeruginosa (prokaryotic) and Scenedesmus acuminatus (eukaryotic) algal cells sourced directly from ponds. Exceptional photocatalytic efficiency of CBG evidenced through the variation in chlorophyll-a content, malondialdehyde, and electrolytic leakage confirmed the complete rupture of the algal cells after 3 h of light exposure. This was further reconfirmed through fluorescent microscopy analysis and interestingly, both HABs failed to re-grow even after 10 days. Enhanced performance of CBG was attributed to the boosted generation of charge carriers facilitated by its extended visible light absorption, which in-turn produced reactive oxygen species (<small><sup>•</sup></small>O<small><sub>2</sub></small><small><sup>-</sup></small> and <small><sup>•</sup></small>OH radicals) that caused irreparable oxidative damage to algal cells, while effectively suppressing the exciton pair recombination supported by its double Z-scheme heterojunction. Furthermore, magnetic recyclability feature of CBG facilitated their easy removal from treated water for avoiding secondary pollution. Design of magnetically recyclable photocatalysts for degrading both prokaryotic and eukaryotic HABs demonstrated here is anticipated to inspire the development of efficient photocatalysts and design cost-effective solutions required for treating ponds and lakes infected with HABs.\",\"PeriodicalId\":73,\"journal\":{\"name\":\"Environmental Science: Nano\",\"volume\":\"18 1\",\"pages\":\"\"},\"PeriodicalIF\":5.8000,\"publicationDate\":\"2024-11-06\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Environmental Science: Nano\",\"FirstCategoryId\":\"6\",\"ListUrlMain\":\"https://doi.org/10.1039/d4en00955j\",\"RegionNum\":2,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Science: Nano","FirstCategoryId":"6","ListUrlMain":"https://doi.org/10.1039/d4en00955j","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Combating Eukaryotic and Prokaryotic Harmful Algal Blooms with Visible-Light Driven BiOBrxI1-x/MFe2O4/g-C3N4 (M = Co & Ni) Recyclable Photocatalysts
Photocatalysis offers a promising avenue for completely mutilate harmful algal blooms (HABs), a significant threat to global freshwater reserves. In this study, a series of BiOBrxI1-x photocatalysts were synthesized and the most optimal catalyst was integrated with pristine g-C3N4 and pre-synthesized CoFe2O4/g-C3N4 and NiFe2O4/g-C3N4 to form binary and ternary composite heterojunction photocatalysts (BiOBr0.95I0.05/g-C3N4 - BG, CoFe2O4/BiOBr0.95I0.05/g-C3N4 - CBG, and NiFe2O4/BiOBr0.95I0.05/g-C3N4 - NBG). Synthesized photocatalysts were thoroughly characterized and their performance was evaluated through the visible light driven photocatalytic degradation of both Microcystis aeruginosa (prokaryotic) and Scenedesmus acuminatus (eukaryotic) algal cells sourced directly from ponds. Exceptional photocatalytic efficiency of CBG evidenced through the variation in chlorophyll-a content, malondialdehyde, and electrolytic leakage confirmed the complete rupture of the algal cells after 3 h of light exposure. This was further reconfirmed through fluorescent microscopy analysis and interestingly, both HABs failed to re-grow even after 10 days. Enhanced performance of CBG was attributed to the boosted generation of charge carriers facilitated by its extended visible light absorption, which in-turn produced reactive oxygen species (•O2- and •OH radicals) that caused irreparable oxidative damage to algal cells, while effectively suppressing the exciton pair recombination supported by its double Z-scheme heterojunction. Furthermore, magnetic recyclability feature of CBG facilitated their easy removal from treated water for avoiding secondary pollution. Design of magnetically recyclable photocatalysts for degrading both prokaryotic and eukaryotic HABs demonstrated here is anticipated to inspire the development of efficient photocatalysts and design cost-effective solutions required for treating ponds and lakes infected with HABs.
期刊介绍:
Environmental Science: Nano serves as a comprehensive and high-impact peer-reviewed source of information on the design and demonstration of engineered nanomaterials for environment-based applications. It also covers the interactions between engineered, natural, and incidental nanomaterials with biological and environmental systems. This scope includes, but is not limited to, the following topic areas:
Novel nanomaterial-based applications for water, air, soil, food, and energy sustainability
Nanomaterial interactions with biological systems and nanotoxicology
Environmental fate, reactivity, and transformations of nanoscale materials
Nanoscale processes in the environment
Sustainable nanotechnology including rational nanomaterial design, life cycle assessment, risk/benefit analysis