Upcycling of Wastewater via Effective Photocatalytic Hydrogen Production Using MnO<sub>2</sub> Nanoparticles—Decorated Activated Carbon Nanoflakes
In the present work, we demonstrated the upcycling technique of effective wastewater treatment via photocatalytic hydrogen production by using the nanocomposites of manganese oxide-decorated activated carbon (MnO<sub>2</sub>-AC). The nanocomposites were sonochemically synthesized in pure...
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MDPI AG
2020-08-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/8/1610 |
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| author | Sankar Sekar Sejoon Lee Preethi Vijayarengan Kaliyappan Mohan Kalirajan Thirumavalavan Santhakumar Saravanan Sekar Sutha Sadhasivam |
| author_facet | Sankar Sekar Sejoon Lee Preethi Vijayarengan Kaliyappan Mohan Kalirajan Thirumavalavan Santhakumar Saravanan Sekar Sutha Sadhasivam |
| author_sort | Sankar Sekar |
| collection | DOAJ |
| description | In the present work, we demonstrated the upcycling technique of effective wastewater treatment via photocatalytic hydrogen production by using the nanocomposites of manganese oxide-decorated activated carbon (MnO<sub>2</sub>-AC). The nanocomposites were sonochemically synthesized in pure water by utilizing MnO<sub>2</sub> nanoparticles and AC nanoflakes that had been prepared through green routes using the extracts of Brassica oleracea and Azadirachta indica, respectively. MnO<sub>2</sub>-AC nanocomposites were confirmed to exist in the form of nanopebbles with a high specific surface area of ~109 m<sup>2</sup>/g. When using the MnO<sub>2</sub>-AC nanocomposites as a photocatalyst for the wastewater treatment, they exhibited highly efficient hydrogen production activity. Namely, the high hydrogen production rate (395 mL/h) was achieved when splitting the synthetic sulphide effluent (S<sup>2−</sup> = 0.2 M) via the photocatalytic reaction by using MnO<sub>2</sub>-AC. The results stand for the excellent energy-conversion capability of the MnO<sub>2</sub>-AC nanocomposites, particularly, for photocatalytic splitting of hydrogen from sulphide wastewater. |
| first_indexed | 2024-03-10T17:17:53Z |
| format | Article |
| id | doaj.art-127864214ca3459dbd241e5eb5feb9e8 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T17:17:53Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-127864214ca3459dbd241e5eb5feb9e82023-11-20T10:24:51ZengMDPI AGNanomaterials2079-49912020-08-01108161010.3390/nano10081610Upcycling of Wastewater via Effective Photocatalytic Hydrogen Production Using MnO<sub>2</sub> Nanoparticles—Decorated Activated Carbon NanoflakesSankar Sekar0Sejoon Lee1Preethi Vijayarengan2Kaliyappan Mohan Kalirajan3Thirumavalavan Santhakumar4Saravanan Sekar5Sutha Sadhasivam6Division of Physics & Semiconductor Science, Dongguk University-Seoul, Seoul 04620, KoreaDivision of Physics & Semiconductor Science, Dongguk University-Seoul, Seoul 04620, KoreaRenewable Energy Lab, Hindustan Institute of Technology and Science, Chennai 603103, Tamil Nadu, IndiaDepartment of Nanotechnology, K.S.R College of Technology, Tiruchengode 637215, Tamil Nadu, IndiaRenewable Energy Lab, Hindustan Institute of Technology and Science, Chennai 603103, Tamil Nadu, IndiaDepartment of Mechanical Engineering, K. Ramakrishnan College of Technology, Trichy 621112, Tamil Nadu, IndiaDepartment of Chemistry, Periyar University, Salem 636011, Tamil Nadu, IndiaIn the present work, we demonstrated the upcycling technique of effective wastewater treatment via photocatalytic hydrogen production by using the nanocomposites of manganese oxide-decorated activated carbon (MnO<sub>2</sub>-AC). The nanocomposites were sonochemically synthesized in pure water by utilizing MnO<sub>2</sub> nanoparticles and AC nanoflakes that had been prepared through green routes using the extracts of Brassica oleracea and Azadirachta indica, respectively. MnO<sub>2</sub>-AC nanocomposites were confirmed to exist in the form of nanopebbles with a high specific surface area of ~109 m<sup>2</sup>/g. When using the MnO<sub>2</sub>-AC nanocomposites as a photocatalyst for the wastewater treatment, they exhibited highly efficient hydrogen production activity. Namely, the high hydrogen production rate (395 mL/h) was achieved when splitting the synthetic sulphide effluent (S<sup>2−</sup> = 0.2 M) via the photocatalytic reaction by using MnO<sub>2</sub>-AC. The results stand for the excellent energy-conversion capability of the MnO<sub>2</sub>-AC nanocomposites, particularly, for photocatalytic splitting of hydrogen from sulphide wastewater.https://www.mdpi.com/2079-4991/10/8/1610manganese oxideactivated carbonnanocompositephotocatalystgreen synthesishydrogen production |
| spellingShingle | Sankar Sekar Sejoon Lee Preethi Vijayarengan Kaliyappan Mohan Kalirajan Thirumavalavan Santhakumar Saravanan Sekar Sutha Sadhasivam Upcycling of Wastewater via Effective Photocatalytic Hydrogen Production Using MnO<sub>2</sub> Nanoparticles—Decorated Activated Carbon Nanoflakes Nanomaterials manganese oxide activated carbon nanocomposite photocatalyst green synthesis hydrogen production |
| title | Upcycling of Wastewater via Effective Photocatalytic Hydrogen Production Using MnO<sub>2</sub> Nanoparticles—Decorated Activated Carbon Nanoflakes |
| title_full | Upcycling of Wastewater via Effective Photocatalytic Hydrogen Production Using MnO<sub>2</sub> Nanoparticles—Decorated Activated Carbon Nanoflakes |
| title_fullStr | Upcycling of Wastewater via Effective Photocatalytic Hydrogen Production Using MnO<sub>2</sub> Nanoparticles—Decorated Activated Carbon Nanoflakes |
| title_full_unstemmed | Upcycling of Wastewater via Effective Photocatalytic Hydrogen Production Using MnO<sub>2</sub> Nanoparticles—Decorated Activated Carbon Nanoflakes |
| title_short | Upcycling of Wastewater via Effective Photocatalytic Hydrogen Production Using MnO<sub>2</sub> Nanoparticles—Decorated Activated Carbon Nanoflakes |
| title_sort | upcycling of wastewater via effective photocatalytic hydrogen production using mno sub 2 sub nanoparticles decorated activated carbon nanoflakes |
| topic | manganese oxide activated carbon nanocomposite photocatalyst green synthesis hydrogen production |
| url | https://www.mdpi.com/2079-4991/10/8/1610 |
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