Effect of biochar on the photocatalytic activity of nitrogen-doped titanium dioxide nanocomposite in the removal of aqueous organic pollutants under visible light illumination
| Autor: | Hassan Hosseini-Monfared, Yasaman Mohammadi, Reza Montazeri, Sakineh Gasemzadeh, Rajender S. Varma |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Nanochemistry Research, Vol 6, Iss 1, Pp 79-93 (2021) |
| Druh dokumentu: | article |
| ISSN: | 2538-4279 2423-818X |
| DOI: | 10.22036/ncr.2021.01.008 |
| Popis: | Biochar, as a low-cost carbon obtained from barley straw, was used for the simple sol–gel synthesis of visible light photocatalysts comprising N-doped TiO2/biochar nanocomposite (N-TiO2/C) and thermally treated N-TiO2/C. The nanocomposites were characterized by SEM, EDX, TEM, XRD, BET, FTIR, DRS UV-vis, and PL measurements. The doped TiO2 catalyzed the photodegradation of rhodamine B (RhB) in aqueous dispersion under visible light illumination where the N-TiO2/C nanocomposite with a band-gap of 2.96 eV and large surface area (206 m2 g-1) showed the highest photocatalytic activity and degrading 99% of RhB under visible light of a 40-Watt white LED lamp within 105 min. Photoluminescence (PL) spectroscopy experiments revealed the effective separation of charge carriers by the N-doped TiO2 materials. The presence of carbon enhances the photocatalytic activity of N-TiO2 material by decreasing the band gap, enhancing the visible light absorption, reducing the reflection of light, enhancing the adsorption of RhB and intermediates on the N-TiO2 surface, thus prolonging the separation electrons (e-) and valence band hole (h+). |
| Databáze: | Directory of Open Access Journals |
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