Biomass-derived active carbon (AC) modified TiO2 photocatalyst for efficient photocatalytic reduction of chromium (VI) under visible light
Creation of novel visible light efficient photocatalyst requires great effort and it is always a challenging task for scientific community. The present report demonstrates the designing of highly effective biomass derived active carbon (AC) modified TiO2 photocatalyst and its utilization towards the...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-08-01
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| Series: | Arabian Journal of Chemistry |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1878535221002732 |
| _version_ | 1818640406812819456 |
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| author | Mabkhoot Alsaiari |
| author_facet | Mabkhoot Alsaiari |
| author_sort | Mabkhoot Alsaiari |
| collection | DOAJ |
| description | Creation of novel visible light efficient photocatalyst requires great effort and it is always a challenging task for scientific community. The present report demonstrates the designing of highly effective biomass derived active carbon (AC) modified TiO2 photocatalyst and its utilization towards the photocatalytic reduction of chromium (VI) to chromium (III) in presence of citric acid under visible light. The photocatalyst comprising of various wt% of AC doped m-TiO2 has been fabricated by straightforward sol–gel approach followed by a sonication technique. The fabricated photocatalysts composed of TiO2 nanoparticles (particles size in the range of 8–20 nm) are entangled with biomass derived AC nanosheets. FTIR analysis further confirmed the successful creation of hetro-structures between AC and TiO2. All hybrid nanostructures showed lower band gap value i.e. in the visible absorption spectral region. The developed photocatalysts were found to be significantly boosted towards the photo-reduction of chromium (VI) to chromium (III) with a photo‐reduction efficiency of 94.7% after 25 min of irradiation, compared to pure TiO2 which gave a conversion rate of 72.10%. The enhanced photocatalytic reduction efficiencies were related to the effectual separation of charge carriers i.e. electron and holes pairs as confirmed by the photoluminescence (PL) analysis. Besides this, the presence of citric acid in dichromate solution enhances the transformation rate due to its involvement in oxidation reaction, which helps in retardation of unacceptable re‐oxidation process of Cr (III) to Cr (VI). Furthermore, the newly designed photocatalyst showed excellent recyclability and reusability. Achieved results and involved reaction mechanism have been thoroughly addressed and elucidated. |
| first_indexed | 2024-12-16T23:10:46Z |
| format | Article |
| id | doaj.art-f6a5c955c32b409b82ad846028e79722 |
| institution | Directory Open Access Journal |
| issn | 1878-5352 |
| language | English |
| last_indexed | 2024-12-16T23:10:46Z |
| publishDate | 2021-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Arabian Journal of Chemistry |
| spelling | doaj.art-f6a5c955c32b409b82ad846028e797222022-12-21T22:12:25ZengElsevierArabian Journal of Chemistry1878-53522021-08-01148103258Biomass-derived active carbon (AC) modified TiO2 photocatalyst for efficient photocatalytic reduction of chromium (VI) under visible lightMabkhoot Alsaiari0Promising Centre for Sensors and Electronic Devices (PCSED), Advanced Materials and Nano-Research Centre, Najran University, P.O. Box: 1988, Najran 11001, Saudi Arabia; Empty Quarter Research Unit, Department of Chemistry, Faculty of Science and Arts at Sharurah, Najran University, Saudi ArabiaCreation of novel visible light efficient photocatalyst requires great effort and it is always a challenging task for scientific community. The present report demonstrates the designing of highly effective biomass derived active carbon (AC) modified TiO2 photocatalyst and its utilization towards the photocatalytic reduction of chromium (VI) to chromium (III) in presence of citric acid under visible light. The photocatalyst comprising of various wt% of AC doped m-TiO2 has been fabricated by straightforward sol–gel approach followed by a sonication technique. The fabricated photocatalysts composed of TiO2 nanoparticles (particles size in the range of 8–20 nm) are entangled with biomass derived AC nanosheets. FTIR analysis further confirmed the successful creation of hetro-structures between AC and TiO2. All hybrid nanostructures showed lower band gap value i.e. in the visible absorption spectral region. The developed photocatalysts were found to be significantly boosted towards the photo-reduction of chromium (VI) to chromium (III) with a photo‐reduction efficiency of 94.7% after 25 min of irradiation, compared to pure TiO2 which gave a conversion rate of 72.10%. The enhanced photocatalytic reduction efficiencies were related to the effectual separation of charge carriers i.e. electron and holes pairs as confirmed by the photoluminescence (PL) analysis. Besides this, the presence of citric acid in dichromate solution enhances the transformation rate due to its involvement in oxidation reaction, which helps in retardation of unacceptable re‐oxidation process of Cr (III) to Cr (VI). Furthermore, the newly designed photocatalyst showed excellent recyclability and reusability. Achieved results and involved reaction mechanism have been thoroughly addressed and elucidated.http://www.sciencedirect.com/science/article/pii/S1878535221002732Biomass derived active carbonTiO2Sol-gelPhotocatalystPhoto-reduction of chromium (VI) |
| spellingShingle | Mabkhoot Alsaiari Biomass-derived active carbon (AC) modified TiO2 photocatalyst for efficient photocatalytic reduction of chromium (VI) under visible light Arabian Journal of Chemistry Biomass derived active carbon TiO2 Sol-gel Photocatalyst Photo-reduction of chromium (VI) |
| title | Biomass-derived active carbon (AC) modified TiO2 photocatalyst for efficient photocatalytic reduction of chromium (VI) under visible light |
| title_full | Biomass-derived active carbon (AC) modified TiO2 photocatalyst for efficient photocatalytic reduction of chromium (VI) under visible light |
| title_fullStr | Biomass-derived active carbon (AC) modified TiO2 photocatalyst for efficient photocatalytic reduction of chromium (VI) under visible light |
| title_full_unstemmed | Biomass-derived active carbon (AC) modified TiO2 photocatalyst for efficient photocatalytic reduction of chromium (VI) under visible light |
| title_short | Biomass-derived active carbon (AC) modified TiO2 photocatalyst for efficient photocatalytic reduction of chromium (VI) under visible light |
| title_sort | biomass derived active carbon ac modified tio2 photocatalyst for efficient photocatalytic reduction of chromium vi under visible light |
| topic | Biomass derived active carbon TiO2 Sol-gel Photocatalyst Photo-reduction of chromium (VI) |
| url | http://www.sciencedirect.com/science/article/pii/S1878535221002732 |
| work_keys_str_mv | AT mabkhootalsaiari biomassderivedactivecarbonacmodifiedtio2photocatalystforefficientphotocatalyticreductionofchromiumviundervisiblelight |