Mercury removal from flue gas using UiO-66-type metal-organic frameworks grafted with organic functionalities

UiO-66-type metal-organic frameworks (MOF) grafted with organic functionalities (–Br, –NO 2 and –NH 2 ) are introduced to investigate the elemental mercury (Hg 0 ) removal from flue gas, and the effect for adding linkers on Hg 0 removal is discussed. Results indicated that added functional groups did not alter the original topology of adsorbents, although their size and morphology varied. Adding –NH 2 and –NO 2 functional groups was detrimental for the thermal stability of UiO-66 except for -Br functional group, and grafted -Br itself was also stable. The Hg 0 removal ability of UiO-66 was not significantly changed by grafting –NH 2 and –NO 2 . The grafted -Br was beneficial for Hg 0 capture, and the Hg 0 removal performance of UiO-66-Br increased with increasing oxygen content and temperature. Furthermore, the mechanism of Hg 0 capture was studied.