Metal Bi Loaded Bi2Ti2O7/CaTiO3 for Enhanced Photocatalytic Efficiency for NO Removal under Visible Light

Abstract

NO has caused many serious environmental problems and even seriously threatened human health. The development of a cheap and efficient method to remove NO from the air has become an urgent need. In this paper, a novel nanocomposite metal-semiconductor photocatalyst Bi-Bi2Ti2O7/CaTiO3 was prepared. Compared to the original Bi2Ti2O7/CaTiO3, the modification by the metal Bi increased its photocatalytic activity from 25% to 64% under visible light irradiation. The improved photoactivity owns to the SPR effect and the electron capture effect of Bi metals in metal-semiconductor loaded systems improving the separation efficiency of electron-hole pairs and significantly improving the light absorption capacity of the composite photocatalyst. The capture experiment of active species showed that •OH, •O2−, h+ and e− are the main active species in the photocatalytic conversion of NO. This work provides new insights into the conformational relationships of Ti-based photocatalysts for NO removal.

Piezo-Photocatalytic Degradation of Tetracycline by 3D BaTiO3 Nanomaterials: The Effect of Crystal Structure and Catalyst Loadings

“…The e − and O 2 reacted to form •O 2 − , and •O 2 − -continued to be attacked by e − generated by piezoelectricity and photocatalysis to generate 1 O 2 (Equations ( 5) and ( 6)). The h + and H 2 O reacted to form •OH and H + (Equation ( 7)) [61]. The generated radicals attacked the TC chemical structure to transform it into products (Equations ( 8) and ( 9)).…”

Materials Design and Development of Photocatalytic NOx Removal Technology

“…The World Health Organization (WHO) recommends a healthy indoor NO x level of 150 µg m −3 (European limit, 40 µg m −3 [21 ppb]) [9,10]. Over the years, NO x removal strategies have been adopted, such as physical adsorption, wet oxidation, chemisorption, biological filtration, thermo-catalytic reduction, photocatalysis, selective catalytic processes, and selective noncatalytic processes [11,12]. The selective catalytic reduction (SCR) process is employed to mitigate high concentrations of NO x emissions from industrial boilers, typically operating at temperatures of 250 • C or higher, by utilizing NH 3 as a scrubber solution.…”