TY - JOUR

T1 - Scalable and Cost-Effective Approach for Multiple NO2 Removal using the MOF-801 Framework

AU - Albrekht, Yana N.

AU - Efremov, Aleksandr A.

AU - Burueva, Dudari B.

AU - Smirnova, Kristina A.

AU - Veber, Sergey L.

AU - Poryvaev, Artem S.

AU - Fedin, Matvey V.

N1 - The authors are thankful to ITC SB RAS for access to equipment and acknowledge agreement no. 22-73-10239.

PY - 2025/5/29

Y1 - 2025/5/29

N2 - The removal of nitrogen dioxide (NO2) is becoming increasingly critical due to its rising concentration in the atmosphere, driven by growing exhaust emissions and industrial production. However, many types of sorbents degrade due to the high reactivity of NO2, rendering them unsuitable for cyclic use. In this study, a low-cost and scalable approach is proposed to apply and regenerate zirconium-based MOF-801 framework for NO2 removal from gas mixtures, allowing its reuse multiple times. Through in situ electron paramagnetic resonance (EPR) spectroscopy, ex situ ATR-FTIR spectroscopy and breakthrough measurements, the mechanism of NO2 sorption in MOF-801 is elucidated. The majority of the sorption capacity is attributed to the formation of nitrates and nitrites, which can be conveniently eliminated from the sorbent. To facilitate this process, a novel regeneration method using low-cost chemicals is developed. The effectiveness of MOF-801 exposed to low concentrations of NO2 (400 ppm, typical for the flue gases) is demonstrated in breakthrough experiments. The whole cycle of NO2 adsorption, product removal, and sorbent regeneration can be employed repeatedly for capturing NO2 from dilute mixtures, paving the way for practical environmental applications.

AB - The removal of nitrogen dioxide (NO2) is becoming increasingly critical due to its rising concentration in the atmosphere, driven by growing exhaust emissions and industrial production. However, many types of sorbents degrade due to the high reactivity of NO2, rendering them unsuitable for cyclic use. In this study, a low-cost and scalable approach is proposed to apply and regenerate zirconium-based MOF-801 framework for NO2 removal from gas mixtures, allowing its reuse multiple times. Through in situ electron paramagnetic resonance (EPR) spectroscopy, ex situ ATR-FTIR spectroscopy and breakthrough measurements, the mechanism of NO2 sorption in MOF-801 is elucidated. The majority of the sorption capacity is attributed to the formation of nitrates and nitrites, which can be conveniently eliminated from the sorbent. To facilitate this process, a novel regeneration method using low-cost chemicals is developed. The effectiveness of MOF-801 exposed to low concentrations of NO2 (400 ppm, typical for the flue gases) is demonstrated in breakthrough experiments. The whole cycle of NO2 adsorption, product removal, and sorbent regeneration can be employed repeatedly for capturing NO2 from dilute mixtures, paving the way for practical environmental applications.

KW - EPR spectroscopy

KW - adsorption

KW - environmental sustainability

KW - metal-organic framework (MOF)

KW - nitrogen dioxide

UR - https://www.mendeley.com/catalogue/1a981c9d-ffdc-30eb-ac81-225472bfc41f/

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-105007002233&origin=inward&txGid=10fa29ae06cfb4c026c8893f7b6737a5

U2 - 10.1002/smll.202503196

DO - 10.1002/smll.202503196

M3 - Article

C2 - 40442944

JO - Small

JF - Small

SN - 1613-6829

ER -