Abstract
Effective methods of detection and removal of iodide ions (I(-)) from radioactive wastewater are urgently needed and developing them remains a great challenge. In this work, an Ag(+) decorated stable nano-MOF UiO-66-(COOH)(2) was developed for the I(-) to simultaneously capture and sense in aqueous solution. Due to the uncoordinated carboxylate groups on the UiO-66-(COOH)(2) framework, Ag(+) was successfully incorporated into the MOF and enhanced the intrinsic fluorescence of MOF. After adding iodide ions, Ag(+) would be produced, following the formation of AgI. As a result, Ag(+)@UiO-66-(COOH)(2) can be utilized for the removal of I(-) in aqueous solution, even in the presence of other common ionic ions (NO(2)(-), NO(3)(-), F(-), SO(4)(2-)). The removal capacity as high as 235.5 mg/g was calculated by Langmuir model; moreover, the fluorescence of Ag(+)@UiO-66-(COOH)(2) gradually decreases with the deposition of AgI, which can be quantitatively depicted by a linear equation. The limit of detection toward I(-) is calculated to be 0.58 ppm.