Radiation Controllable Synthesis of Robust Covalent Organic Framework Conjugates for Efficient Dynamic Column Extraction of 99TcO4
發布日期：2020/9/4 17:30:45
Anion-scavenging materials tailored for 99TcO4 trapping are ur
gently needed for both nuclear-related environmental remediation
and management of spent nuclear fuel. For the fifirst time, we report
here an ultra-robust imidazolium-decorated covalent organic
framework (COF) conjugate fabricated by an ionizing radiation
strategy, for effificient capture of 99TcO4. The charged imidazolium
moieties are controllably anchored into the channel of the COF by
simply adjusting the g-ray dose, thereby leading to tunable ReO4
uptake up to 952 mg g1 with high selectivity and fast kinetics.
More importantly, the high porosity and ultra-robust nanofifiber
structure of the COFs make them ideal packing materials for
dynamic column experiments. >99.98% ReO4/TcO4 can be effifi-
ciently separated and re-collected, even after four adsorption
desorption cycles, ranking a new record of the elimination rate for
ReO4 adsorption. The performance of these materials suggests
attractive opportunities in practical applications for TcO4 removal
from the environment and nuclear waste.
