In Situ Confined Synthesis of a Copper-Encapsulated Silicalite-1 Zeolite for Highly Efficient Iodine Capture

Abstract

Effective capture of radioactive iodine is highly desirable for decontamination purposes in spent fuel reprocessing. Cu-based adsorbents with a low cost and high chemical affinity for I 2 molecules act as a decent candidate for iodine elimination, but the low utilization and stability remain a significant challenge. Herein, a facile in situ confined synthesis strategy is developed to design and synthesize a copper-encapsulated flaky silicalite-1 (Cu@FSL-1) zeolite with a thickness of ≤300 nm. The maximum iodine uptake capacity of Cu@FSL-1 can reach 625 mg g −1 within 45 min, which is 2 times higher than that of a commercial silver-exchanged zeolite even after nitric acid and NO X treatment. The Cu nanoparticles (NPs) confined within the zeolite exert superior iodine adsorption and immobilization properties as well as high stability and fast adsorption kinetics endowed by the all-silica zeolite matrix. This study provides new insight into the design and controlled synthesis of zeolite-confined metal adsorbents for efficient iodine capture from gaseous radioactive streams.

Three-Dimensional-Network-Structured Bismuth-Based Silica Aerogel Fiber Felt for Highly Efficient Immobilization of Iodine

“…The results suggest that the adsorption performance of Bi@SNF decreased with an increase of the nitric acid concentration, and the adsorption performance decreased by only 5.6% after 0.1 M HNO 3 treatment. The adsorption amount of iodine vapor remained at 735.4 mg/g after 1 M HNO 3 treatment and 670 mg/g after 2 M HNO 3 treatment, which is higher than the adsorption amount of iodine vapor after acid treatment of other reported materials . This demonstrates that the material is suitable for iodine vapor adsorption and immobilization under high acidity conditions.…”

“…The adsorption amount of iodine vapor remained at 735.4 mg/g after 1 M HNO 3 treatment and 670 mg/g after 2 M HNO 3 treatment, which is higher than the adsorption amount of iodine vapor after acid treatment of other reported materials. 36 This demonstrates that the material is suitable for iodine vapor adsorption and immobilization under high acidity conditions. Panels e and f of Figure 4 show the iodine adsorption capacity of 0.2 Bi@SNF as a function of time.…”

Combining Electrospinning and Hydrothermal Methods to Prepare Bi2S3@SiO2 Nanostructure-Based Membranes for Enhanced Capture Capacity of Off-Gas Iodine from a Nuclear Plant

“…In the literature, the two most common methods of iodine vapor treatment were wet scrubbing and solid-phase adsorption. , Compared with the wet scrubbing method, solid-phase adsorption was much favored by researchers because of its operability, reliability, non-corrosivity, and low maintenance and operating costs. − Various materials were investigated to capture iodine, including activated carbon, graphene-based materials, pitch-based porous polymers, aerogels, silver-based materials, zeolites, and metal–organic frameworks (MOFs). − Silver-based materials have attracted intensive research attention because of their high reactivity with I to form insoluble AgI . However, there are many disadvantages of these silver-based materials, such as toxicity, high cost, and causing secondary pollution during storage.…”

Cu nanoparticles confined in siliceous MFI zeolite for methanol steam reforming

“…35 To the best of our knowledge, the one-pot encapsulation of inexpensive nanoparticles in the siliceous zeolites through the ligand-stabilized approach dedicated for the potential industrial applications is still rare. 31,36…”

“…35 To the best of our knowledge, the one-pot encapsulation of inexpensive nanoparticles in the siliceous zeolites through the ligand-stabilized approach dedicated for the potential industrial applications is still rare. 31,36 Herein, we utilize the ligand-stabilized approach for confining Cu species into siliceous MFI-type zeolite silicate-1, which was subsequently reduced by H 2 (denoted as Cu@S-1). Compared with the impregnation method (denoted as Cu/S-1), this method is facile and results in the high dispersion of Cu species within the silicate-1 zeolite matrix.…”