Photocatalytic Degradation of E.Coli Bacteria by Graphitic Carbon Nitride Photocatalysts under Visible Light Irradiation
Photocatalytic technology offers novel solutions for wastewater treatment using visible light. Graphitic carbon nitride, as a polymeric semiconductor, has attracted significant attention in this field. However, overcoming the limitations of this material remains a major challenge for researchers. In...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Water and Wastewater Consulting Engineers Research Development
2024-08-01
|
| Series: | آب و فاضلاب |
| Subjects: | |
| Online Access: | https://www.wwjournal.ir/article_212372_90846bdd9782ad893a4fb529c0cd50af.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832575450912653312 |
|---|---|
| author | Zahra Ahmadi Panah Reyhaneh Dehghan Mehran Bijari Afsaneh Shahbazi |
| author_facet | Zahra Ahmadi Panah Reyhaneh Dehghan Mehran Bijari Afsaneh Shahbazi |
| author_sort | Zahra Ahmadi Panah |
| collection | DOAJ |
| description | Photocatalytic technology offers novel solutions for wastewater treatment using visible light. Graphitic carbon nitride, as a polymeric semiconductor, has attracted significant attention in this field. However, overcoming the limitations of this material remains a major challenge for researchers. In this study, a graphitic carbon nitride photocatalyst was synthesized using a thermal polymerization method with melamine as a precursor in a new gaseous atmosphere of CO2. For comparison, similar samples were synthesized in common atmospheres such as N2 and air. The structure, morphology, and properties of the samples were characterized using various analyses. Additionally, considering the importance of E.Coli bacteria, their antibacterial activity against this bacterium was evaluated under both light and dark conditions. The sample synthesized in the CO2 atmosphere had a surface area approximately 3 and 2 times higher than those synthesized in air and nitrogen atmospheres, respectively. Also, the luminescence intensity of this sample was significantly lower, indicating an improvement in photocatalytic performance. The results of microbiological tests showed that the CN-CO2 sample completely inactivated E.Coli bacteria with an initial concentration of 107 CFU/mL when exposed to an effective dose of 0.2 g/L within 180 minutes under visible light irradiation. In contrast, the CN-air and CN-N2 samples inhibited 62.7% and 29.5% of the bacteria, respectively. The results also indicated that CN-CO2 had a high ability to inhibit bacterial growth in the dark. The results of the disk diffusion assay and bacterial viability tests in solid media also confirmed these findings. Given the significant advantages of this nanomaterial (CN-CO2), including high photocatalytic activity, strong antibacterial properties, and a simple and one-step synthesis method, it can be used as an efficient photocatalyst for water and wastewater treatment industries. |
| format | Article |
| id | doaj-art-461b907fb88d42c0b7c03362f2fd7995 |
| institution | Kabale University |
| issn | 1024-5936 2383-0905 |
| language | English |
| publishDate | 2024-08-01 |
| publisher | Water and Wastewater Consulting Engineers Research Development |
| record_format | Article |
| series | آب و فاضلاب |
| spelling | doaj-art-461b907fb88d42c0b7c03362f2fd79952025-02-01T07:44:57ZengWater and Wastewater Consulting Engineers Research Developmentآب و فاضلاب1024-59362383-09052024-08-01353698810.22093/wwj.2024.474438.3431212372Photocatalytic Degradation of E.Coli Bacteria by Graphitic Carbon Nitride Photocatalysts under Visible Light IrradiationZahra Ahmadi Panah0Reyhaneh Dehghan1Mehran Bijari2Afsaneh Shahbazi3MSc., Dept. of Environmental Technologies, Environmental Science Research Institute, Shahid Beheshti University, Tehran, IranPhD., Dept. of Biodiversity and Ecosystem Management, Environmental Science Research Institute, Shahid Beheshti University, Tehran, IranPhD., Dept. of Environmental Technologies, Environmental Science Research Institute, Shahid Beheshti University, Tehran, IranAssoc. Prof., Dept. of Environmental Technologies, Environmental Science Research Institute, Shahid Beheshti University, Tehran, IranPhotocatalytic technology offers novel solutions for wastewater treatment using visible light. Graphitic carbon nitride, as a polymeric semiconductor, has attracted significant attention in this field. However, overcoming the limitations of this material remains a major challenge for researchers. In this study, a graphitic carbon nitride photocatalyst was synthesized using a thermal polymerization method with melamine as a precursor in a new gaseous atmosphere of CO2. For comparison, similar samples were synthesized in common atmospheres such as N2 and air. The structure, morphology, and properties of the samples were characterized using various analyses. Additionally, considering the importance of E.Coli bacteria, their antibacterial activity against this bacterium was evaluated under both light and dark conditions. The sample synthesized in the CO2 atmosphere had a surface area approximately 3 and 2 times higher than those synthesized in air and nitrogen atmospheres, respectively. Also, the luminescence intensity of this sample was significantly lower, indicating an improvement in photocatalytic performance. The results of microbiological tests showed that the CN-CO2 sample completely inactivated E.Coli bacteria with an initial concentration of 107 CFU/mL when exposed to an effective dose of 0.2 g/L within 180 minutes under visible light irradiation. In contrast, the CN-air and CN-N2 samples inhibited 62.7% and 29.5% of the bacteria, respectively. The results also indicated that CN-CO2 had a high ability to inhibit bacterial growth in the dark. The results of the disk diffusion assay and bacterial viability tests in solid media also confirmed these findings. Given the significant advantages of this nanomaterial (CN-CO2), including high photocatalytic activity, strong antibacterial properties, and a simple and one-step synthesis method, it can be used as an efficient photocatalyst for water and wastewater treatment industries.https://www.wwjournal.ir/article_212372_90846bdd9782ad893a4fb529c0cd50af.pdfgraphitic carbon nitrideadvanced oxidation processesphotocatalystwastewater treatmente.coli |
| spellingShingle | Zahra Ahmadi Panah Reyhaneh Dehghan Mehran Bijari Afsaneh Shahbazi Photocatalytic Degradation of E.Coli Bacteria by Graphitic Carbon Nitride Photocatalysts under Visible Light Irradiation آب و فاضلاب graphitic carbon nitride advanced oxidation processes photocatalyst wastewater treatment e.coli |
| title | Photocatalytic Degradation of E.Coli Bacteria by Graphitic Carbon Nitride Photocatalysts under Visible Light Irradiation |
| title_full | Photocatalytic Degradation of E.Coli Bacteria by Graphitic Carbon Nitride Photocatalysts under Visible Light Irradiation |
| title_fullStr | Photocatalytic Degradation of E.Coli Bacteria by Graphitic Carbon Nitride Photocatalysts under Visible Light Irradiation |
| title_full_unstemmed | Photocatalytic Degradation of E.Coli Bacteria by Graphitic Carbon Nitride Photocatalysts under Visible Light Irradiation |
| title_short | Photocatalytic Degradation of E.Coli Bacteria by Graphitic Carbon Nitride Photocatalysts under Visible Light Irradiation |
| title_sort | photocatalytic degradation of e coli bacteria by graphitic carbon nitride photocatalysts under visible light irradiation |
| topic | graphitic carbon nitride advanced oxidation processes photocatalyst wastewater treatment e.coli |
| url | https://www.wwjournal.ir/article_212372_90846bdd9782ad893a4fb529c0cd50af.pdf |
| work_keys_str_mv | AT zahraahmadipanah photocatalyticdegradationofecolibacteriabygraphiticcarbonnitridephotocatalystsundervisiblelightirradiation AT reyhanehdehghan photocatalyticdegradationofecolibacteriabygraphiticcarbonnitridephotocatalystsundervisiblelightirradiation AT mehranbijari photocatalyticdegradationofecolibacteriabygraphiticcarbonnitridephotocatalystsundervisiblelightirradiation AT afsanehshahbazi photocatalyticdegradationofecolibacteriabygraphiticcarbonnitridephotocatalystsundervisiblelightirradiation |