Role of graphene nanocomposite photocatalysts in photo-reduction of Cr (VI) for wastewater treatment
| Autor: | Tapas Dakhinaray, Brundabana Naik, Naresh Kumar Sahoo, Nimai C. Nayak, Barada Prasanna Dash, Prasanta Kumar Sahoo, J. Nanda, Himanshu Mohapatra |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Nanocomposite Graphene Heterojunction 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences law.invention Metal chemistry.chemical_compound chemistry Chemical engineering law visual_art 0103 physical sciences visual_art.visual_art_medium Photocatalysis Ceramic Surface charge Hexavalent chromium 0210 nano-technology |
| Zdroj: | Materials Today: Proceedings. 41:324-328 |
| ISSN: | 2214-7853 |
| Popis: | Among numerous heavy metals, hexavalent Chromium [Cr (VI)] place a potential threat and mostly seen in several industrial effluents such as leather tanning, printing, ceramics. For removal of Cr from waste water, reduction of Cr (VI) to Cr (III) is preferred due to less toxicity of Cr (III) than Cr (VI). Among various reduction processes, Cr (VI) reduction by photocatalysis is favoured owing to its greener approach and behaviour. Graphene nanocomposite photocatalysts show higher photo reduction efficiency due to large surface area and extraordinary electron conductance of graphene. As there is almost no resistance on the surface of graphene, so electrons move freely and faster resulting excellent surface charge transfer; therefore enhanced photocatalytic Cr (VI) reduction. We have systematically investigated the origin and enhancement of photo-reduction Cr (VI) by graphene nanocomposites photocatalysts. Graphene based metal oxides nanocomposites, metal sulphides, 0D/2D heterojunction nanocomposites, non-metallic nanocmposites, plasmonic nanocomposites and Z-scheme nanocomposites photocatalysts have been highlighted and discussed. |
| Databáze: | OpenAIRE |
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