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

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.

Development of MOF Based Recyclable Photocatalyst for the Removal of Different Organic Dye Pollutants

“…Depending on the photocatalytic duration the linear variation in ln (C t /C 0 ) follows the kinetics of a pseudo-first-order reaction. The constant (k) value of the pseudo-first-order reaction rate was estimated using the following equation [ 46 ]: ln (C t /C 0 ) = −kt where, k is the constant of reaction rate, t is the duration of photocatalytic reaction, C 0 and C t are the absorbances at the initial concentration of dye (i.e., time t = 0) and the concentration of dye after light exposure (i.e., t = t), respectively.…”

“…Further, the electrons are captured by AMOF and restrict the electron (e − )-hole (h + ) recombination which enables the O 2 − radicals to degrade different dye pollutants (Equations (5) and (6)). In almost all situations, holes will react with H 2 O to generate OH − radicals (Equation (7)) [ 46 ]. It is well known that OH − radicals are strong oxidizing agents capable of decomposing almost all organic contaminants.…”

Understanding the role of inorganic carrier transport layer materials and interfaces in emerging perovskite solar cells

“…Ternary metal oxides with the perovskite structures of ABO 3 and A 2 BO 4 are gaining more attention than binary metal oxides, given that they allow better tunability of the bandgap, work function, and conductivity by adjusting the relative ratio of cations. [190][191][192][193][194][195] BaSnO 3 (BSO) is a wide bandgap (i.e., 3.2 eV) n-type transparent semiconductor with a perovskite structure similar to the photoactive layer. High-temperature processed BSO led to reduced charge recombination and charge transfer resistance at the BSO/perovskite interface, delivering PCEs close to 12%.…”

Enhanced Organic Pollutant Removal Efficiency of Electrospun NiTiO3/TiO2-Decorated Carbon Nanofibers

“…The co-doped composite photocatalyst (1% co-doped NiTiO 3 /g-C 3 N 4 ) produced a higher k app value (0.0072 min −1 ), while the one loaded with 3% co-doped NiTiO 3 /g-C 3 N 4 showed a lower value of the rate constant (0.0057 min −1 ). Kitchamsetti et al synthesized MnTiO 3 perovskite nanodiscs and utilized them for the photocatalytic degradation of several organic dyes [ 64 ]. These nanodiscs provide stable and recyclable photocatalytic activity under Xenon lamp irradiation.…”