Ti doped BaMnO3 perovskite structure as photocatalytic agent for the degradation of noxious air and water pollutants

Abstract

Photocatalytic degradation of noxious water and air impurities like Methylene blue (MB), Rhodamine B (RhB), NO x-, and CO is carried out by pristine and Ti-doped BaMnO 3 (BaMn 0.85 Ti 0.15 O 2.93 , BMT). Perovskite BMT ceramic mixed with equimolar ratio of zeolite is used for investigation of water and air pollutant degradation. The synthesized Ti-doped BaMnO 3 (BaMn 0.85 Ti 0.15 O 2.93 , BMT) perovskite was characterized using X-ray diffraction (XRD) and FE-SEM techniques. The XRD pattern of Ti-doped BaMnO 3 shows the formation of two phases, namely BaMnO 2.92 and BaMn 0.85 Ti 0.15 O 2.93 and BMT. The photocatalytic degradation of noxious water and air pollutants were analyzed using UV-Vis and XPS for doped and pristine BaMnO 3 . From obtained results, it is observed that the synthesized BMT shows enhanced photocatalytic degradation (~ 99%) as compared to BaMnO 3 toward noxious water impurities like RhB and MB dyes within 270 and 150 min under sunlight. The synthesized BMT compound shows the absorbance spectrum in the wavelength range of 200-600 nm. The UV-Vis DRS confirms the absorption edges for the compound above 400 nm i.e., visible light absorber with a bandgap 2.48 eV. On the other hand, XPS analysis of bulk BMT-zeolite on exposure to sunlight shows the complete degradation of adsorbed NO x gases from the BMT-zeolite surface as compared to the unexposed zeolite sample surface. Therefore, BMT can be used as active photocatalytic agent for the remediation of environmental noxious water and air pollutants.

Photocatalysis and perovskite oxide-based materials: a remedy for a clean and sustainable future

“…The redox reaction of the photogenerated electron–hole pair gives reactive species such as (OH*, OH − , H + ), and these reactive species then attack the organic pollutants and degrade them into low molecular weight products (environmentally friendly products) within no time. 153,157,158…”

A novel La2MnTiO6 perovskite for photocatalytic degradation of tetracycline hydrochloride

“…Moreover, both theoretical analyses and experimental investigations have indicated that the substitution of Mn for the Ti site narrows the band gap of SrTiO3 and limits e − and h + recombination, thereby generating sufficient time to let the photovoltaic holes oxidize the water to form •OH to break down TC [16]. Siddharth Singh et al [17] researched doping Ti into BaMnO3 to decompose toxic impurities in water. It was observed that BaMn0.85Ti0.15O2.93 showed enhanced photocatalytic decomposition (~99%) compared with BaMnO3 for toxic water impurities such as Rhodamine B and Methylene blue dyes within 270 and 150 minutes under natural sunlight.…”