Oxygen Vacancies Mediated Complete Visible Light NO Oxidation via Side-On Bridging Superoxide Radicals

Abstract

It is of a great challenge to seek for semiconductor photocatalysts with prominent reactivity to remove kinetically inert dilute NO without NO emission. In this study, complete visible light NO oxidation mediated by O is achieved over a defect-engineered BiOCl with selectivity exceeding 99%. Well-designed oxygen vacancies on the prototypical (001) surface of BiOCl favored the possible formation of geometric-favorable superoxide radicals (•O) in a side-on bridging mode under ambient condition, which thermodynamically suppressed the terminal end-on •O associated NO emission in case of higher temperatures, and thus selectively oxidized NO to nitrate. These findings can help us to understand the intriguing surface chemistry of photocatalytic NO oxidation and design highly efficient NO removal systems.

Enhancing Photocatalytic Activity of NO Removal through an In Situ Control of Oxygen Vacancies in Growth of TiO2

“…NO is one of the most common and harmful air pollutions for the ecological environment and human health because it can cause the acid rain, ozonosphere hole, greenhouse effect, and photochemical smog . Photocatalytic technology is regarded as an ideal method to remove low concentration NO in atmosphere . So far, the defective TiO 2 has rarely been used for photocatalytic NO removal.…”

In-situ fabrication SnO2/SnS2 heterostructure for boosting the photocatalytic degradation of pollutants

“…The use of co-catalysts, mostly no-ble metals (e.g., Pt, Au, and Pd), has been demonstrated as a successful strategy for improving electron migration. Furthermore, wider absorption semiconductors, such as WO3 [6,16,17], CuO [18,19], CdS [5,20,21], SnS2 [22], MoS2 [23][24][25][26], BiOX (X = Cl, Br, I) [27][28][29][30], BiVO4 [31][32][33][34], g-C3N4 [35][36][37][38][39][40][41][42], and red/black phosphorous [43][44][45], have been employed to greatly enhance photocatalytic efficiency [46]. Up till now, other novel strategies have been investigated to reduce the recombination of photogenerated carriers and accelerate the transfer of electron-hole pairs [40,[46][47][48][49][50][51][52].…”

Unveiling real active site for photocatalytic H2O2 evolution: A combined experimental and DFT-TDDFT study

“…4e and Supplementary Fig. 13a), suggesting that O 2 got an electron 37,38 . are effectively separated from the h + left on the NV surface, effectively avoiding the recombination of photogenerated carriers, which explain the experimental result that NDCN exhibited a more effective charge separation ability ( Supplementary Fig.…”