Photocatalytic activity of MnTiO3 perovskite nanodiscs for the removal of organic pollutants

Narasimharao Kitchamsetti; Pravin N Didwal; Sameena R Mulani; Madhuri S Patil; Rupesh S Devan

doi:10.1016/j.heliyon.2021.e07297

Photocatalytic activity of MnTiO₃ perovskite nanodiscs for the removal of organic pollutants

Heliyon. 2021 Jun 11;7(6):e07297. doi: 10.1016/j.heliyon.2021.e07297. eCollection 2021 Jun.

Authors

Narasimharao Kitchamsetti¹, Pravin N Didwal², Sameena R Mulani¹, Madhuri S Patil¹, Rupesh S Devan¹

Affiliations

¹ Department of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore 453552, India.
² Department of Materials Science and Engineering, Chonnam National University, 77, Yongbongro, Bukgu, Gwangju, 61186, South Korea.

Abstract

MTO nanodiscs synthesized using the hydrothermal approach were explored for the photocatalytic removal of methylene blue (MB), rhodamine B (RhB), congo red (CR), and methyl orange (MO). The disc-like structures of ~16 nm thick and ~291 nm average diameter of stoichiometric MTO were rhombohedral in nature. The MTO nanodiscs delivered stable and recyclable photocatalytic activity under Xe lamp irradiation. The kinetic studies showed the 89.7, 80.4, 79.4, and 79.4 % degradation of MB, RhB, MO, and CR at the rate constants of 0.011(±0.001), 0.006(±0.001), 0.007(±0.0007), and 0.009 (±0.0001) min^-1, respectively, after the 180 min of irradiation. The substantial function of photogenerated holes and hydroxide radicals pertaining to the dye removal phenomena is confirmed by radical scavenger trapping studies. Overall, the present studies provide a way to develop pristine and heterostructure perovskite for photocatalysts degradation of various organic wastes.

Keywords: Dye degradation; MnTiO3 perovskite; Organic pollutant; Photocatalyst; TEM.