Study of BiPbO2NO3 for I-129 Fixation under Reducing Conditions

2000 ◽  
Vol 663 ◽  
Author(s):  
Takayuki Amaya ◽  
Atsushi Mukunoki ◽  
Mamoru Shibuya ◽  
Hiroshi Kodama
Keyword(s):  
Ion Exchange ◽  
Distribution Coefficient ◽  
High Salinity ◽  
Exchange Capacity ◽  
Iodide Ions ◽  
Low Salinity ◽  
Ion Exchange Reaction ◽  
Anion Exchange Capacity ◽  
Reducing Conditions ◽  
Exchange Properties

ABSTRACTLeaching of the iodide ion from BiPbO2I (BPI), BPI encapsulated in cement (BPIC) and AgI was studied in a low salinity solution and in a high salinity solution under reducing conditions. Although BPI released a limited amount of iodide ions (less than 1%) into the low salinity solution, it released more than 30% of iodide ions into the high salinity solution within 80 days. AgI released more than 30% of iodide ions into both low and high salinity solutions within 80 days. It was proved that BPI is more stable than AgI in the low salinity solution under reducing conditions. BPIC released a limited number of iodide ions (less than 5%) into both low and high salinity solutions. BPIC showed the best leach resistance in the high salinity solution.BiPbO2NO3 (BPN) was developed to remove iodide ions in a solution and fix them in BPI by the ion exchange reaction. Ion exchange properties under reducing conditions were studied. An anion exchange capacity of 1.0 mEq/g and a distribution coefficient of larger than 0.1 m3/kg were obtained in a solution at a pH of between 9 and 13. The advantages of the process using BPN for removing and immobilizing Iodine-129 were discussed from the standpoint of process simplification.

scholarly journals The Li+, Na+ and K+ ion exchange reaction process on the surface of mixed oxide SiO2/TiO2/Sb2O5 surface prepared by the sol-gel processing method

2005 ◽  
Vol 30 (1) ◽  
pp. 51-58 ◽  
Author(s):  
C. U. Ferreira ◽  
J. E. Gonçalves ◽  
Y. V. Kholin ◽  
Y. Gushikem
Keyword(s):  
Ion Exchange ◽  
Mixed Oxide ◽  
Exchange Process ◽  
Sol Gel ◽  
Exchange Capacity ◽  
Processing Method ◽  
Exchange Property ◽  
Ion Exchange Process ◽  
Ion Exchange Reaction ◽  
Gel Processing

The porous mixed oxide SiO2/TiO2/Sb2O5 obtained by the sol-gel processing method presented a good ion exchange property and a high exchange capacity towards the Li+, Na+ and K+ ions. In the H+/M+ ion exchange process, the H+ / Na+ could be described as presenting an ideal character. The ion exchange equilibria of Li+ and K+ were quantitatively described with the help of the model of fixed tetradentate centers. The results of simulation evidence that for the H+ / Li+ exchange the usual situation takes place: the affinity of the material to the Li+ ions is decreased with increasing the degree of ion exchange. On the contrary, for K+ the effects of positive cooperativity, that facilitate the H+ / K+ exchange, were revealed.

Rational Construction of Polymeric Mercuric(II) Imidazole with High Anion Exchange Capacity

2011 ◽  
Vol 239-242 ◽  
pp. 2683-2686 ◽  
Author(s):  
Bo Xiao ◽  
Qian Qian Li ◽  
Li Jun Yang ◽  
Shao Ming Fang
Keyword(s):  
Ion Exchange ◽  
Coordination Polymer ◽  
Ir Spectra ◽  
Exchange Capacity ◽  
Zigzag Chain ◽  
Potassium Salts ◽  
Pxrd Pattern ◽  
Anion Exchange Capacity ◽  
Ft Ir ◽  
Rational Construction

New 1-D zigzag chain coordination polymer {[HgBr2(pbbm)].DMF}n (1) has been successfully constructed with the aim of exploiting new and potent ion-exchange materials. Remarkably, the coordinated Br- anions in the title polymer can be replaced completely by F-, Cl- and I- anions when the crystals are immersed in the aqueous solutions of the corresponding potassium salts, respectively. This exchange is quantified by FT-IR spectra, the PXRD pattern as well as EDS analyses.

Synthesis and Ion Exchange Properties of Thermally Stable Titanium(IV) Vanadate: Separation of Sr2+ from Ca2+, Ba2+, and Mg2+

1972 ◽  
Vol 50 (13) ◽  
pp. 2071-2078 ◽  
Author(s):  
Mohsin Qureshi ◽  
K. G. Varshney ◽  
S. K. Kabiruddin
Keyword(s):  
Ion Exchange ◽  
Structural Changes ◽  
Exchange Capacity ◽  
Thermally Stable ◽  
Sodium Vanadate ◽  
Ion Exchange Capacity ◽  
Inorganic Ion Exchanger ◽  
Inorganic Ion ◽  
Separation Factors ◽  
Exchange Properties

A new, thermally stable, and highly strontium-specific inorganic ion exchanger, titanium(IV) vanadate, has been prepared by mixing 0.5 M solution of titanic chloride and sodium vanadate at pH 0–1. Its ion exchange capacity is 0.65 mequiv./g at 400 °C. Separation factors of Sr2+ with respect to Ba2+, Ca2+, and Mg2+ are 8, 11.8, and 33.3, respectively. Binary mixtures of Sr2+ with Ba2+, Ca2+, and Mg2+ have been separated. Calcium and magnesium are eluted with 0.001 M HNO3. Barium and strontium are eluted with 0.01 and 0.1 M HNO3, respectively. A new parameter ΔC/ΔT is proposed for the study of structural changes in inorganic ion exchangers.

scholarly journals Oxometalate-Glass Composites and Thin Films

1990 ◽  
Vol 180 ◽  
Author(s):  
Karin Moller ◽  
Thomas Bein ◽  
C. Jeffrey Brinker
Keyword(s):  
Thin Films ◽  
Ion Exchange ◽  
Sol Gel ◽  
Composite Films ◽  
Exchange Capacity ◽  
Exafs Spectroscopy ◽  
Gel Formation ◽  
Ion Exchange Capacity ◽  
Glass Composites ◽  
Exchange Properties

ABSTRACTNew glass-composites with ion exchange properties have been developed. Ammonium 12-molybdophosphate (AMP) (NH4)3PMo12O40, and ammonium 12-tungstophosphate (AWP) (NH4)3PW12O40, known for their ion exchange capabilities, are included either in preformed aerogels with defined pore size, or are added to sol-gel mixtures during the process of gel formation. Characterization is carried out by FTIR, Raman and EXAFS spectroscopy. Ion exchange capacities for the oxometalate precursors are determined for silver and rubidium and are compared to those of the glass composites. Glass composites show high ion exchange capacity, but some portion of the metalate complexes leaches from the glass during the procedure. This is in contrast to thin composite films, which have almost no porosity and do not show loss of metalate. EXAFS spectroscopy demostrates that the oxometalate microstructure is maintained in glass composites and that rubidium ions after ion exchange in glasses occupy similar cation positions as in the precursor compounds.

Nanoceramics-Biomolecular Conjugates for Gene and Drug Delivery

2006 ◽  
Vol 45 ◽  
pp. 769-778 ◽  
Author(s):  
Jin Ho Choy ◽  
Jae Min Oh ◽  
Soo Jin Choi
Keyword(s):  
Drug Delivery ◽  
Exchange Reaction ◽  
Laser Scanning ◽  
Interlayer Space ◽  
Inorganic Compounds ◽  
Exchange Capacity ◽  
Drug Delivery Carrier ◽  
Ion Exchange Reaction ◽  
Anion Exchange Capacity ◽  
Confocal Fluorescence

We were quite successful in demonstrating that two-dimensional inorganic compounds like anionic and cationic clays can be used as gene or drug delivery carriers, those which are completely different from conventional ones such as viral-based, naked, and cationic liposomes, those which are limited in certain cases of applications due to their toxicity, immunogenecity, poor integration, and etc. Since LDHs with positive layer charge have an anion exchange capacity, functional biomolecules with a negative charge can be intercalated into hydroxide layers of LDH by a simple ion-exchange reaction to form a bio-LDH nanohybrid. On the contrary, clays can uptake biofuctional molecules or drugs with positive charge in the interlayer space by cation exchange reaction. The possible roles of inorganic lattice as the gene and drug delivery carrier will be shown by demonstrating the cellular uptake experiments of FITC-LDH, with laser scanning confocal fluorescence microscopy as well as of radioactive isotope-labeled ATP-LDH hybrid. As the typical examples for gene and drug delivery systems, As-myc-LDH, MTX-LDH, and Itraconazol-clay nanohybrids will be demonstrated in detail.

scholarly journals Graphitic Carbon Nitride based Photocatalytic Systems for High Performance Hydrogen Production: A Review

2021 ◽  
pp. 161-192
Author(s):  
S. Sharma
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Ion Exchange ◽  
Distribution Coefficient ◽  
High Performance ◽  
Sol Gel ◽  
Exchange Capacity ◽  
Ion Exchange Capacity ◽  
E Coli ◽  
Scanning Electron

Pectin cerium(IV) iodate (PcCeI) and cerium(IV) iodate (CeI) cation ion exchange materials were synthesized via sol–gel methods. The materials were characterized by using Fourier transform infrared spectroscopy, X-ray diffractometer, thermogravimetric analysis, and scanning electron microscopy. The ion exchange capacity (IEC), thermal stability, distribution coefficient (Kd), and pH titrations were investigated to recognize the cation exchange behavior of the materials. The IEC of pectin-cerium(IV) iodate (PcCeI and cerium(IV) iodate CeI were reported as 1.80 meq/g and 0.92 meq/g, respectively. The higher distribution coefficient values of 250.01 and 219.14 mg/L confirmed the selectivity of pectin-cerium(IV) iodate hybrid ion exchanger for As3+ and Zn2+. The antibacterial activity of synthesized ion exchangers was explored for E. coli bacteria and observed relatively higher for PcCeI as compared to CeI.

scholarly journals Thermodynamics of Ion-Exchange Reaction in Predicting the Ionic Selectivity of Auchlite ARA-9366 and Auchlite A-378 Anion Exchange Resins

2014 ◽  
Vol 25 ◽  
pp. 1-7 ◽  
Author(s):  
P.U. Singare ◽  
A.N. Patange
Keyword(s):  
Ion Exchange ◽  
Exchange Reaction ◽  
Anion Exchange ◽  
Ion Selectivity ◽  
Exchange Reactions ◽  
Ionic Selectivity ◽  
Iodide Ions ◽  
Ion Exchange Reaction ◽  
Anion Exchange Resins ◽  
Exchange Resins

The paper deals with predicting the iodide ion selectivity of nuclear and non-nuclear grade anion exchange resins. The ionic selectivity prediction was made on the basis of thermodynamic data of Clˉ/I ˉ ion exchange reaction. It was observed that with rise in temperature from 30.0°C to 45.0 °C, the equilibrium constant (K) values were observed to decreases from 59.77x10-2 to 23.77x10-2 for Auchlite ARA-9366 resins and from 9.01x10-2 to 4.05x10-2 for Auchlite A-378 resins. The decrease in K values with rise in temperature, indicate exothermic ion exchange reactions having enthalpy values of -47.87 and -39.51 kJ/mol respectively. The high K and low enthalpy values obtained for Auchlite ARA-9366 resins indicate their greater selectivity for the iodide ions in the solution as compared to Auchlite A-378 resins, when both the resins are present in chloride form.

Biological Hybrid Materials for Drug Delivery System

2006 ◽  
Vol 111 ◽  
pp. 1-6 ◽  
Author(s):  
Jin Ho Choy
Keyword(s):  
Drug Delivery ◽  
Laser Scanning ◽  
Toxic Metal ◽  
Exchange Capacity ◽  
Inorganic Materials ◽  
Drug Delivery Carrier ◽  
Ion Exchange Reaction ◽  
Anion Exchange Capacity ◽  
Biological Compatibility ◽  
Double Hydroxide

We have attempted to realize new biomolecular-inorganic nanohybrids with two different functions, one from inorganic moiety and the other from biological one. Recently we were quite successful in demonstrating that a two-dimensional inorganic compound like layered double hydroxide (LDH) can be used as gene or drug delivery carriers. Such inorganic vectors are completely new and different from conventionally developed ones such as viral-based, naked, and cationic liposomes, those which are limited in certain cases of applications due to their toxicity, immunogenecity, poor integration, and etc. But the mentioned problems can be overcome by synthesizing inorganic vectors properly with non-toxic metal ions having biological compatibility. Since LDHs with positive layer charge have an anion exchange capacity, functional biomolecules with a negative charge can be intercalated into hydroxide layers of LDH by a simple ion-exchange reaction to form a bio-LDH nanohybrid. We also found that the hydroxide layers of LDHs could protect the intercalated molecules very efficiently. If necessary, inorganic materials, as reservoir and delivery carrier, can be intentionally removed by dissolving it in an acidic which offer a way of recovering the encapsulated biomolecules. The possible roles of inorganic lattice as the gene and drug delivery carrier will be shown by demonstrating the cellular uptake experiments of FITC, fluorophore, with laser scanning confocal fluorescence microscopy. A

Preparation and Properties of Composite Antibacterial Agent Containing Copper and Zinc Ions

2009 ◽  
Vol 79-82 ◽  
pp. 965-968
Author(s):  
Shu Xia Ren ◽  
Hui Fang Yang ◽  
Xiu Shu Tian ◽  
Yan Fang Li
Keyword(s):  
Ion Exchange ◽  
Antibacterial Agent ◽  
Antibacterial Agents ◽  
Antibacterial Activities ◽  
Exchange Capacity ◽  
Zinc Ions ◽  
Ion Exchange Capacity ◽  
Ph Values ◽  
Ion Exchange Reaction ◽  
Copper And Zinc

The composite antibacterial agents were prepared with Medical stone containing Cu2+ and Zn2+ by liquid ion-exchange reaction. The ion exchange capacity of the as-prepared Medical stone composite antibacterial agents (MSAA) products were investigated by ICP-AES, and the antibacterial activities of the agents were tested by Bacteriastasis ratio, and the structures were characterized by XRD and SEM. The results show that the conditions of preparation, such as pH, concentrations of copper and zinc ions, reaction time and reaction temperature, have important influences on the ion exchange of MSAA. The maximum ion exchange capacity have been obtained when 0.2mol/l Cu2+ and 0.6 mol /l Zn2+ reacted with Medical stone powers in the solution with pH values of 8 for 8 hours at 50 °C. Meanwhile good antibacterial activities and safety are also gained. The reasons for causing the above results are that copper and zinc ions can enter the framework of Medical stone through ion exchanging and adsorption, and are released slowly owing to its porosity.

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