Stability of metal-organic frameworks towards 8-ray irradiation: Role of organic groups

Available online Metal-organic frameworks (MOFs) have emerged high potentials in recovering nuclides, while their performances preferentially depend on the stability under ray irradiation including 8-ray. Herein, the contribution of organic groups on 8-ray resistance property was studied via using UiO-66 and MIL-101 as the platforms. All the group-absence and single-group MOFs exhibit poor stability under high dosage of 8-ray. The groups of -NH2 and -COOH have slightly negative effects while the -SO3H, -NO2 and -OH will largely weaken the stability. Interestingly, dual-group MOFs including UiO-66-(OH)2 and UiO-66-(COOH)2 show excellent 8-ray resistance up to the irradiation dosage of 2 MGy. Compared with single group, the high-density organic groups surrounding the clusters can act an effective protection parclose and the larger the nonpolar surface area of high -density organic groups, the greater the interactions with the clusters, which may prevent the attack from 8-ray electron stream. We anticipate that this work will provide a guideline for rationally designing materials with strong 8-ray resistance.