Enhanced iodine uptake in ionic liquid by biomass, solvents, or supported materials

Novel reed + deep eutectic solvent-derived adsorbents for recyclable and low-cost capture of dyes and radioactive iodine from wastewater

“…90% of iodine in 2 h. 7 [Bmim][X] (X = Br, I, Cl) could remove over 80% of iodine after 5 h. 4 Wang et al found that the iodine removal efficiency follows the order Gly/[Bmim][Ac]/DMSO (∼78%) < Glu/[Bmim][Ac]/DMSO < His/[Bmim][Ac]/DMSO < Ala/[Bmim][Ac]/DMSO < Ser/[Bmim][Ac]/DMSO < Lys/[Bmim][Ac]/DMSO < Pro/[Bmim][Ac]/DMSO (∼92%). 33 Mu et al found that the iodine removal efficiency of DES ChI : methylurea could reach nearly 100% after 24 h. 32 Our previous reports found that DESs PEG200 : thiourea and cysteine : lactic acid could remove nearly 100% within 8 h. 1,2 However, iodine entrapment by ILs and DESs is difficult for the regeneration of ILs and DESs. The DES-derived materials for iodine capture in this work could be recycled at least five times with a negligible loss of efficiency as shown in Fig.…”

“…For example, ChI : methylurea could remove iodine with an efficiency of nearly 100% after 24 h. 32 PEG200 : thiourea and cysteine : lactic acid could remove nearly 100% of iodine within 8 h. 1,2 However, iodine capture by ILs and DESs is difficult for the regeneration of ILs and DESs. Moreover, most reports have focused on radioactive iodine dissolved in cyclohexane or hexane, 1,2,32,33 which is different from real situations in which radioactive iodine is easily released into oceans or lakes. Most DESs can absorb water from air, 34 which would not be favorable for the capture of radioactive iodine from wastewater.…”

“…6 Xue et al found that PEG200, PEG400, PEG600 and PEG4000 could absorb 52%, 52%, 48%, 18% of iodine in 5 h. 7 By adding 5% salt in PEG200, the order of iodine removal efficiency is NaI ≈ NaSCN ≈ NaBr > NaDCA > NaClO 4 > NaPF 6 , among which NaI/PEG200 could remove ca. 90% of iodine in 2 h. 7 [Bmim][X] (X = Br, I, Cl) could remove over 80% of iodine after 5 h. 4 Wang et al found that the iodine removal efficiency follows the order Gly/ 33 Mu et al found that the iodine removal efficiency of DES ChI : methylurea could reach nearly 100% after 24 h. 32 Our previous reports found that DESs PEG200 : thiourea and cysteine : lactic acid could remove nearly 100% within 8 h. 1,2 However, iodine entrapment by ILs and DESs is difficult for the regeneration of ILs and DESs. The DES-derived materials for iodine capture in this work could be recycled at least five times with a negligible loss of efficiency as shown in Fig.…”