Aqueous miscible organic solvent treated NiTi layered double hydroxide De-NOx photocatalysts

Journal article

New efficient photocatalysts are required to remediate polluted urban atmospheres. We prepared a series of highly dispersed aqueous miscible organic (AMO) solvent treated NiTi layered double hydroxide (NixTi-AMO-LDHs (x = 2,3)) and studied their performance in the photocatalytic abatement of NOx gases. These photocatalysts can be prepared by a simple and scalable coprecipitation method at room temperature. NixTi-AMO-LDHs (x = 2,3) have been prepared with specific N2 BET surface areas and pore volumes up to to 492 m2g−1 and 1.37 cm3 g−1 respectively. Under sunlight simulation, the De-NOx performance of the conventional LDH and P25 (TiO2) benchmarks were surpassed by 40% and 17% respectively by the NixTi-AMO-LDHs. The NixTi-AMO-LDHs photocatalyst also exhibited outstanding reusability and unusually low release of the toxic NO2. The selectivity for the De-NOx process was investigated by in situ DRIFT measurements, the high surface area and pore volume was observed to play a significant role on the adsorption of the NO2 and N2O4 intermediates. The 2D character of the AMO-LDHs contributed to an enhancement in the production of radical species under illumination and reduction charge carrier recombination.

Authors: Pastor, A; Chen, C; de Miguel, G; Martin, F; Cruz-Yusta, M

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Elsevier
• Journal: Chemical Engineering Journal More from this journal
• Volume: 429
• Article number: 132361
• Publication date: 2021-09-12
• Acceptance date: 2021-09-05
• DOI: 10.1016/j.cej.2021.132361
• ISSN: 1385-8947
• Language: English
• Keywords: nitrogen oxides; AMOSTN; FFR; photocatalyst; anosheet; LDH