Hydrolytically stable foamed HKUST-1@CMC composites realize high-efficient separation of U(VI)

Abstract

Summary HKUST-1@CMC (HK@CMC) composites that show good acid and alkali resistance and radiation resistance were successfully synthesized by introducing carboxymethyl cellulose (CMC) onto the surface of HKUST-1 using a foaming strategy. For the first time, the composites were explored as efficient adsorbents for U(VI) trapping from aqueous solution, with encouraging results of large adsorption capacity, fast adsorption kinetics, and desirable selectivity toward U(VI) over a series of competing ions. More importantly, a hybrid derivative film was successfully prepared for the dynamic adsorption of U(VI). The results show that ∼90% U(VI) can be removed when 45 mg L −1 U(VI) was passed through the film one time, and the removal percentage is still more than 80% even after four adsorption-desorption cycles, ranking one of the most practical U(VI) scavengers. This work offers new clues for application of the Metal-organic-framework-based materials in the separation of radionuclides from wastewater.

Just Soaping Them: The Simplest Method for Converting Metal Organic Frameworks into Superhydrophobic Materials

“…Pore size distribution studies indicated no change in the pore sizes of HKUST-1 , which were found to be ≈5.5 and ≈9.1 Å (Figures S36 and S37), in accordance with literature values, , upon treatment with oleate anions. Similar to UiO-66 , the decrease of the BET surface areas of HKUST-1 samples when treated with concentrated oleate solutions can be attributed to the formation of a dense oleate layer at the MOF’s surface, considering that oleate anions are too large to penetrate the pores of HKUST-1 .…”