The rapid removal of iodide from aqueous solutions using a silica-based ion-exchange resin

Ye, Zhenxiong; Chen, Lifeng; Liu, Caocong; Ning, Shunyan; Wang, Xinpeng; Wei, Yuezhou

doi:10.1016/j.reactfunctpolym.2018.12.002

Cited by 44 publications

(15 citation statements)

References 35 publications

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“…Surprisingly, relatively few equivalent studies have been devoted to iodide, both in general terms and with a nuclear waste focus. This is possibly because the iodide anion is rather high in the known series of selectivity for conventional anion-exchange resins and in some conditions, established IX technology is sufficient for its effective removal [29,39]. However, with the remarkable chemical conditions that must be overcome within this remit, the application of HSAB is close to essential [23,24,40].…”

Section: Metals For Iodine Capturementioning

confidence: 99%

Capture of aqueous radioiodine species by metallated adsorbents from wastestreams of the nuclear power industry: a review

et al. 2021

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Iodine-129 poses a significant challenge in the drive towards lowering radionuclide emissions from used nuclear fuel recycling operations. Various techniques are employed for capture of gaseous iodine species, but it is also present, mainly as iodide anions, in problematic residual aqueous wastestreams, which have stimulated research interest in technologies for adsorption and retention of the radioiodine. This removal effort requires specialised adsorbents, which use soft metals to create selectivity in the challenging chemical conditions. A review of the literature, at laboratory scale, reveals a number of organic, inorganic and hybrid adsorbent matrices have been investigated for this purpose. They are functionalised principally by Ag metal, but also Bi, Cu and Pb, using numerous synthetic strategies. The iodide capacity of the adsorbents varies from 13 to 430 mg g−1, with ion-exchange resins and titanates displaying the highest maximum uptakes. Kinetics of adsorption are often slow, requiring several days to reach equilibrium, although some ligated metal ion and metal nanoparticle systems can equilibrate in < 1 h. Ag-loaded materials generally exhibit superior selectivity for iodide verses other common anions, but more consideration is required of how these materials would function successfully in industrial operation; specifically their performance in dynamic column experiments and stability of the bound radioiodine in the conversion to final wasteform and subsequent geological storage. Article highlights Metallated adsorbents for the capture and retention of radioiodine in the nuclear industry are assessed. The strengths and weaknesses of organic, inorganic and hybrid support matrices and loading mechanisms are discussed. Pathways for progression of this technology are proposed. Graphic abstract

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Section: Metals For Iodine Capturementioning

confidence: 99%

Capture of aqueous radioiodine species by metallated adsorbents from wastestreams of the nuclear power industry: a review

et al. 2021

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“…Although the surface areas of mag@silica and mag@silica-Ag decreased, their value is sufficiently large compared to any other adsorbents [ 3 , 22 , 27 , 28 , 31 ]. Because the pore volume of mag@silica-Ag was lower than the bare silica, it can be concluded that the silver was deposited inside the pores of the material [ 32 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Silver-Impregnated Magnetite Mesoporous Silica Composites for Removing Iodide in Aqueous Solution

Choi

2021

Toxics

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Mag@silica-Ag composite has a high sorption ability for I− in aqueous solution due to its high surface area and strong affinity for the studied anion. The material adsorbed I− rapidly during the initial contact time (in 45 min, η = 80%) and reached adsorption equilibrium after 2 h. Moreover, mag@silica-Ag proved to selectively remove I− from a mixture of Cl−, NO3− and I−. The adsorption behavior fitted the Langmuir isotherm perfectly and the pseudo-second-order kinetic model. Based on the Langmuir isotherm, the maximum adsorption capacity of mag@silica-Ag was 0.82 mmol/g, which is significantly higher than previously developed adsorbents. This study introduces a practical application of a high-capacity adsorbent in removing radioactive I− from wastewaters.

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“…The exchanged resin was washed with deionized water 3 to 4 times to remove excess free Ag + ions present at the surface of the resin beads. Resin beads were further filtered and air-dried at room temperature to obtain free-flowing resin beads ( Mohebbi et al., 2019 ; Ye et al., 2019 ).…”

Section: Methodsmentioning

confidence: 99%

Silver-doped active carbon spheres and their application for microbial decontamination of water

Joshi

Dutta

Gaur

et al. 2022

Heliyon

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The rapid removal of iodide from aqueous solutions using a silica-based ion-exchange resin

Cited by 44 publications

References 35 publications

Capture of aqueous radioiodine species by metallated adsorbents from wastestreams of the nuclear power industry: a review

Capture of aqueous radioiodine species by metallated adsorbents from wastestreams of the nuclear power industry: a review

Synthesis of Silver-Impregnated Magnetite Mesoporous Silica Composites for Removing Iodide in Aqueous Solution

Silver-doped active carbon spheres and their application for microbial decontamination of water

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