Photocatalytic Degradation of Tobacco Tar Using CsPbBr3 Quantum Dots Modified Bi2WO6 Composite Photocatalyst

Abstract

Polycyclic aromatic hydrocarbons (PAHs) in tobacco tar are regarded as a significant threat to human health. PAHs are formed due to the incomplete combustion of organics in tobacco and cigarette paper. Herein, for the first time, we extended the application of CsPbBr3 quantum dots (CsPbBr3) to the photocatalytic degradation of tobacco tar, which was collected from used cigarette filters. To optimize the photoactivity, CsPbBr3 was coupled with Bi2WO6 for the construction of a type-II photocatalyst. The photocatalytic performance of the CsPbBr3/Bi2WO6 composite was evaluated by the degradation rate of PAHs from tobacco tar under simulated solar irradiation. The results revealed that CsPbBr3/Bi2WO6 possesses a large specific surface area, outstanding absorption ability, good light absorption and rapid charge separation. As a result, in addition to good stability, the composite photocatalyst performed remarkably well in degrading PAHs (over 96% were removed in 50 mins of irradiation by AM 1.5 G). This study sheds light on promising novel applications of halide perovskite.

CsPbBr3 perovskite quantum dots as a visible light photocatalyst for cyclisation of diamines and amino alcohols: an efficient approach to synthesize imidazolidines, fused-imidazolidines and oxazolidines

“…43,44,50,53,54 In the presence of oleylamine (OLAM) at high temperature, DBI generates HBr which in turn reacts with Pb(II) and Cs(I) ions in situ to form the QDs. 45 The emission maxima of the QDs can be tuned by changing the reaction temperature (Fig. S1 †).…”

“…The conventional transition metal 23 and organic dye 24 based visible light-induced photo-redox catalysis suffers from major pitfalls such as: the use of expensive metals, narrow absorption windows, fixed bandgaps, inferior charge separation capacity, mediocre product selectivity, poor airtolerance, non-reusability, etc. In contrast, CsPbBr 3 QDs exhibit superior photophysical properties such as excellent photon absorption/emission ability, [31][32][33] tunable band-edge alignment, 34 broad absorption window, 35 long lifetime of photoexcited states, 36 and robust separation/transfer of electron-hole pairs 37,38 which have been widely exploited in solar cells, 39,40 light-emitting diodes (LEDs), 41 detectors, 42 lasers, 32 photocatalysts, [43][44][45][46][47][48][49] etc. In this work, we report facile sp 3 C-H bond functionalisation of N-Me (alkyl) groups using a CsPbBr 3 QD based visible light photocatalyst (Fig.…”

Photocatalytic Deposition of Nanostructured CsPbBr3 Perovskite Quantum Dot Films on Mesoporous TiO2 and Their Enhanced Visible-Light Photodegradation Properties

“… 22 Also, the CsPbBr 3 QDs have been applied to photocatalytic degradation of tobacco tar alongside other semiconductors, like Bi 2 WO 6 . 25 …”

“…Guo et al investigated a CsPbBr 3 /TiO 2 photocatalyst for visible-light photodegradation of rhodamine with better efficiency than a commercially available TiO 2 catalyst (P25) used as the reference material . Also, the CsPbBr 3 QDs have been applied to photocatalytic degradation of tobacco tar alongside other semiconductors, like Bi 2 WO 6 …”

“…22 Also, the CsPbBr 3 QDs have been applied to photocatalytic degradation of tobacco tar alongside other semiconductors, like Bi 2 WO 6 . 25 Both physical and chemical deposition methods were employed to sensitize TiO 2 electrodes with halide perovskite QDs films. 26,27 The chemical deposition methods, also known as solution-processing methods, are a more facile approach with greater possibilities for scale-up manufacturing.…”