The current industrial-scale production of molybdenum-99(^(99)Mo)and iodine-131(^(131)I)is heavily predicated on thermal neutron irradiation of LEU targets.In this route,^(99)Mo and ^(131)I are separated using a solid...The current industrial-scale production of molybdenum-99(^(99)Mo)and iodine-131(^(131)I)is heavily predicated on thermal neutron irradiation of LEU targets.In this route,^(99)Mo and ^(131)I are separated using a solid-phase extraction approach.The goal of this study was to develop and evaluate copolymeric beads that could be used to separate ^(99)Mo and ^(131)I from their aqueous solutions.Different aminated styrenedivinyl benzene co-polymeric beads were successfully manufactured for this approach.The structural features of the synthesized copolymers were characterized.The resin frameworks were found to have homogeneous spherical shapes decorated with a very thin layer of amine moieties.The FT-IR peaks caused by N—H stretching and C—N bending vibrations show the successful functionalization of the resins'surfaces with amine moieties selective for the sorption of I-over Mo O_(4)^(2-)ions.Under various circumstances,the produced resins were assessed for sorption of ^(99)Mo and ^(131)I from their aqueous solutions.They showed an enhanced sorption capability for I-ions compared to MoO_(4)^(2-)ions and attained equilibrium in less than 20 min.Data declare that the sorption of MoO_(4)^(2-)and I-ions onto synthesized resins was attained through an ion exchange process with Cl-ions.In such interactions,one iodide ion(I-)consumes only one active site from the resin surface,while two active sites must be exhausted to retain one MoO_(4)^(2-)ion onto the surface of the resins.The exchange interaction of both MoO_(4)^(2-)and I-ions was an endothermic process.Further,the elution of ^(99)Mo and ^(131)I radioisotopes loaded on synthesized resins was investigated using various eluents.Additional sets of individual and binary dynamic experiments were performed using columns packed with trimethylamine styrene divinyl benzene(TMA-PSDVB)and triethylamine styrene divinyl benzene(TEA-PSDVB)resins.The individual breakthrough sorption capacity of TMA-PSDVB and TEA-PSDVB resins had values of 381.6 and352.6 mg·g^(-1)for ^(131)I and values of 134.7 and 117.2 mg·g^(-1)for ^(99)Mo isotopes,respectively.Furthermore,TMA-PSDVB resin exhibited breakthrough sorption capacity for ^(99)Mo and ^(131)I,in the binary system,amounting to 123.7 and 331.6 mg·g^(-1)with elution percentages reaching 75.4%and 12.1%,respectively.These findings demonstrate that Mo(Ⅵ)ions were efficiently separated from I(Ⅰ)ions.Finally,the reported aminated polymeric resins may be regarded as promising solid phases for the separation and recovery of Mo(Ⅵ)and I(Ⅰ).展开更多
The coastal seawater of Mediterranean of Alexandria receives large amount of discharged waters containing industrial wastes, sewage, and agricultural and domestic drainage. Fluoride and some parameters were(chemical a...The coastal seawater of Mediterranean of Alexandria receives large amount of discharged waters containing industrial wastes, sewage, and agricultural and domestic drainage. Fluoride and some parameters were(chemical and physical) determined. The data gave indication that the content and the amount of the discharged water largely affect the chemical composition of the coastal water. Stepwise regression analysis was highly significant and the model was very fruitful, where the observed and calculated values were mostly concordant. This may indicated that there was a relation between fluoride content in coastal seawater and its content in the discharged water.展开更多
文摘The current industrial-scale production of molybdenum-99(^(99)Mo)and iodine-131(^(131)I)is heavily predicated on thermal neutron irradiation of LEU targets.In this route,^(99)Mo and ^(131)I are separated using a solid-phase extraction approach.The goal of this study was to develop and evaluate copolymeric beads that could be used to separate ^(99)Mo and ^(131)I from their aqueous solutions.Different aminated styrenedivinyl benzene co-polymeric beads were successfully manufactured for this approach.The structural features of the synthesized copolymers were characterized.The resin frameworks were found to have homogeneous spherical shapes decorated with a very thin layer of amine moieties.The FT-IR peaks caused by N—H stretching and C—N bending vibrations show the successful functionalization of the resins'surfaces with amine moieties selective for the sorption of I-over Mo O_(4)^(2-)ions.Under various circumstances,the produced resins were assessed for sorption of ^(99)Mo and ^(131)I from their aqueous solutions.They showed an enhanced sorption capability for I-ions compared to MoO_(4)^(2-)ions and attained equilibrium in less than 20 min.Data declare that the sorption of MoO_(4)^(2-)and I-ions onto synthesized resins was attained through an ion exchange process with Cl-ions.In such interactions,one iodide ion(I-)consumes only one active site from the resin surface,while two active sites must be exhausted to retain one MoO_(4)^(2-)ion onto the surface of the resins.The exchange interaction of both MoO_(4)^(2-)and I-ions was an endothermic process.Further,the elution of ^(99)Mo and ^(131)I radioisotopes loaded on synthesized resins was investigated using various eluents.Additional sets of individual and binary dynamic experiments were performed using columns packed with trimethylamine styrene divinyl benzene(TMA-PSDVB)and triethylamine styrene divinyl benzene(TEA-PSDVB)resins.The individual breakthrough sorption capacity of TMA-PSDVB and TEA-PSDVB resins had values of 381.6 and352.6 mg·g^(-1)for ^(131)I and values of 134.7 and 117.2 mg·g^(-1)for ^(99)Mo isotopes,respectively.Furthermore,TMA-PSDVB resin exhibited breakthrough sorption capacity for ^(99)Mo and ^(131)I,in the binary system,amounting to 123.7 and 331.6 mg·g^(-1)with elution percentages reaching 75.4%and 12.1%,respectively.These findings demonstrate that Mo(Ⅵ)ions were efficiently separated from I(Ⅰ)ions.Finally,the reported aminated polymeric resins may be regarded as promising solid phases for the separation and recovery of Mo(Ⅵ)and I(Ⅰ).
文摘The coastal seawater of Mediterranean of Alexandria receives large amount of discharged waters containing industrial wastes, sewage, and agricultural and domestic drainage. Fluoride and some parameters were(chemical and physical) determined. The data gave indication that the content and the amount of the discharged water largely affect the chemical composition of the coastal water. Stepwise regression analysis was highly significant and the model was very fruitful, where the observed and calculated values were mostly concordant. This may indicated that there was a relation between fluoride content in coastal seawater and its content in the discharged water.
