Fabrication of novel AgVO3/BiOI nanocomposite photocatalyst with photoelectrochemical activity towards the degradation of Rhodamine B under visible light irradiation
2021
Bavani, Thirugnanam | Madhavan, Jagannathan | Prasad, Saradh | AlSalhi, Mohamad S. | ALJaffreh, Mamduh | Vijayanand, Selvaraj
In the present work, a visible light driven AgVO₃/BiOI nanocomposite photocatalyst with different wt % (1, 2, 3) of AgVO₃ was fabricated by using facile hydrothermal method. Further, the nanocomposite was characterized by FT-IR, XRD, SEM, TEM, EDS, UV–vis DRS, photoluminescence and photoelectrochemical studies. The structural characterization showed nanorods on nanosheet surface. Among different AgVO₃ loaded samples, the photocatalytic efficiency of 1 wt % AgVO₃/BiOI nanocomposite was found to be comparatively higher than the pure BiOI and AgVO₃. The photodegradation rate constant values of pure BiOI, AgVO₃ and 1, 2, 3 wt % AgVO₃/BiOI nanocomposites are 0.006, 0.0033, 0.0255, 0.01575, 0.0116 min⁻¹ respectively. This enhanced photocatalytic activity was due to the increasing visible light absorption ability and efficient separation of the charge carriers. Thereby, the 1 wt % AgVO₃/BiOI nanocomposite photocatalyst exhibited increased photodegradation activity, photostability and recyclability characteristics. The radical trapping experiment confirmed the role of OH and h⁺ in the photocatalytic degradation of RhB. Based on this, the probable mechanism of degradation of RhB under visible light irradiation has also been proposed. Hence, we believe it could be a promising material that can be employed for the photodegradation of organic pollutants present in wastewater.
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