Amidoxime-functionalized covalent organic framework as simultaneous luminescent sensor and adsorbent for organic arsenic from water

• The first study of utilizing COFs as sensors and adsorbents for organic arsenic. Ultralow limits detection highest adsorption capacity. Facile regeneration high selectivity. Experiments combined with theoretical calculations reveal the mechanism. Organoarsenic compounds are widely used feed additives in poultry industry. However, release organoarsenic-containing wastewater can cause serious poisoning to ecosystem. For this reason, arsenic from is crucial but also very challenging. Here, use covalent frameworks (COFs) fluorescence water has been investigated time. Two isoreticular crystalline highly porous sp 2 carbon-conjugated were synthesized, amidoxime-functionalized via post-synthetic modification (PSM). long-range order ?-conjugated system ensure that both act fluorescent detecting representative arsenic, roxarsone (ROX). quenching efficiencies ROX on over 98%. (LOD) by estimated be 6.5 12.3 nM. Additionally, regular pores abundantly decorated amidoxime moiety exhibit extraordinary accessibility, which facilitates ROX. High capacities obtained materials amounts up 732 787 mg g ?1 . After five times recycling, a negligible decrease capacity was noted, reveals excellent ability those two COFs. These results indicate state-of-the-art potential practical organoarsenic wastewater.