Varma, Ranjana ORCID: 0000-0002-5131-7417, Yadav, Manisha, Tiwari, Kajal, Makani, Nisha ORCID: 0000-0002-2293-3122, Gupta, Suraj ORCID: 0000-0001-8128-5869, Kothari, Dushyant C, Miotello, Antonio ORCID: 0000-0002-6895-616X and Patel, Nainesh ORCID: 0000-0003-3363-5136
(2018)
Roles of Vanadium and Nitrogen in Photocatalytic Activity of VN-Codoped TiO<sub>2</sub> Photocatalyst.
Photochemistry and photobiology, 94 (5).
pp. 955-964.
Text
VNdoped TiO2.pdf - Author Accepted Manuscript Download (1MB) | Preview |
Abstract
In the present manuscript, we explore the VN-codoped TiO<sub>2</sub> system intended to understand the role played by each dopant in synergistic enhancement in performance of TiO<sub>2</sub> photocatalyst. The photocatalytic decomposition of organic pollutants in aqueous solution under visible light was used as a probe reaction to evaluate the performance of VN-codoped TiO<sub>2</sub> samples with different V and N concentrations. An optical measurement of VN-codoped TiO<sub>2</sub> shows considerable improved visible light absorption with increase in V-concentration as compared to increase in N concentration, which was due to the effective narrowing of the band gap by V-doping. The energy levels formed by N-dopants act as the trapping centers for photogenerated holes to suppress recombination process as indicated by PL and TRPL results. It is also observed that at high V-concentrations recombination centers are created in the form of oxygen vacancies as indicated by XPS and PL. In VN-codoped TiO<sub>2</sub> , addition of N partially fills these oxygen vacancies to reduce the number of recombination centers and prolong the lifetime of charge carriers. Thus, V improves the visible light absorption while N reduces the recombination of electron-hole pairs, thus creating the synergistic effect to produce three times better performance than pure TiO<sub>2</sub> .
Item Type: | Article |
---|---|
Depositing User: | Symplectic Admin |
Date Deposited: | 17 Jun 2019 07:32 |
Last Modified: | 18 Mar 2024 04:06 |
DOI: | 10.1111/php.12942 |
Related URLs: | |
URI: | https://livrepository.liverpool.ac.uk/id/eprint/3026810 |