Efficient uptake of perrhenate/pertechnenate from aqueous solutions by the bifunctional anion-exchange resin

2018 ◽  
Vol 106 (7) ◽  
pp. 581-591 ◽  
Author(s):  
Jie Li ◽  
Lin Zhu ◽  
Chengliang Xiao ◽  
Lanhua Chen ◽  
Zhifang Chai ◽  
...  
Keyword(s):  
Anion Exchange ◽  
High Selectivity ◽  
Sorption Properties ◽  
Maximum Sorption Capacity ◽  
Anion Exchange Resins ◽  
Wide Range ◽  
Maximum Sorption ◽  
Chain Group ◽  
Efficient Uptake ◽  
Exchange Resins

Abstract In this work, batch experiments were carried out to explore the sorption properties for perrhenate (ReO4−, a surrogate for TcO4−) by two types of commercial bifunctional anion-exchange resins (Purolite A530E and A532E). It is found that these two bifunctional anion-exchange resins could rapidly remove ReO4− from aqueous solution within 150 min and the maximum sorption capacity for ReO4− reached as high as 707 and 446 mg/g for Purolite A530E and A532E, respectively. The sorption properties were independent of pH over a wide range from 1 to 13. More importantly, both Purolite A530E and A532E exhibited excellent selectivity for the removal of ReO4− in the presence of large excess of NO3− and SO42−. Finally, the removal percentage of ReO4− by these two resins could be >90% and 80%, respectively, from the Hanford low-level waste melter off-gas scrubber simulant stream. Such high selectivity of Purolite A530E and A532E for the removal of ReO4− might be due to the presence of the long-chain group of –[N(Hexyl)3]+, which favored hydrophobic and large anions such as ReO4−/TcO4− rather than NO3−.

Polymeric Resins Adsorb and Release Oryzalin in Response to pH

Weed Science ◽  
2007 ◽  
Vol 55 (2) ◽  
pp. 157-163
Author(s):  
Glenn B. Fain ◽  
Timothy L. Grey ◽  
Glenn R. Wehtje ◽  
Charles H. Gilliam ◽  
Jason A. Osborne
Keyword(s):  
Anion Exchange ◽  
Maximum Concentration ◽  
Exchange Resin ◽  
Slow Release ◽  
Anion Exchange Resin ◽  
Anion Exchange Resins ◽  
Maximum Sorption ◽  
Polymeric Resins ◽  
Exchange Resins ◽  
Polymeric Anion

Two polymeric anion-exchange resins and one sorbent resin were evaluated for their propensity to adsorb, and subsequently desorb, oryzalin. The intent was to determine whether these resins could adsorb and subsequently release oryzalin in a manner that would render these resins as an option for slow-release herbicide delivery. The dinitroaniline herbicide oryzalin is weakly acidic with a dissociation constant (pKa) of 8.6. An additional objective was to determine whether altering the pH between sorption and desorption would enhance the desired performance. Maximum oryzalin sorption by the two anion-exchange resins was between 127 and 132 mg g−1ai. The sorbent resin was adsorbed at a maximum concentration of 191 mg g−1ai. Maximum sorption occurred with the pH 10 solutions with all resins. Average oryzalin desorption by the anion-exchange resin was between 0.12 and 3.84 mg g−1per desorption event. Maximum desorption occurred at pH 6.0. Results reveal that the resins evaluated may have merit for slow-release herbicide delivery.

Sorbents with biocidal properties for disinfection of water for various purposes

2013 ◽  
Vol 14 (3) ◽  
pp. 376-382 ◽  
Author(s):  
Mariya Sus ◽  
Tetiana Mitchenko
Keyword(s):  
Anion Exchange ◽  
Water Disinfection ◽  
Anion Exchange Resins ◽  
Wide Range ◽  
Conventional Methods ◽  
Exchange Resins ◽  
Biocidal Properties

Conventional methods for water disinfection, especially chlorination, have a lot of disadvantages and should be perfected or substituted with safer and more efficient methods. One of the possible solutions to this problem is the application of sorbents with high disinfection efficacy. In this study, the opportunity of producing sorbents with biocidal properties based on non-oxidizing biocides and anion exchange resins (AERs) was investigated. A wide range of different type of AERs were tested for the ability to sorb biocides (dibromonitrilopropionamide (DBNPA) and polyhexamethyleneguanidine (PHMG)) and to exert disinfection activity. Most suitable AERs for production of biocidal sorbents were outlined.

COMPARAISON DE DIFFERENTES METHODES D’EXTRACTION DU P ASSIMILABLE EN RELATION AVEC LES PROPRIETES CHIMIQUES ET PHYSIQUES DES SOLS DU QUEBEC

1985 ◽  
Vol 65 (1) ◽  
pp. 35-46 ◽  
Author(s):  
T. SEN TRAN ◽  
M. GIROUX
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
The Other ◽  
Available P ◽  
Soil Group ◽  
Anion Exchange Resins ◽  
Extractable P ◽  
Wide Range ◽  
Exchange Resins ◽  
Bray 1

The objective of this study was to compare different available-P extracting methods on 83 Québec soils. The alkaline Olsen’s method and five acid chemical extractants (Bray-1, Bray-2, new Mehlich, North Carolina double acid DA-4 and DA-10) were compared with each other and with two anion-exchange resin methods. The ratio of P-HCl/P-DAF of Mehlich was used to identify the group of soils with predominant P-Ca forms [Formula: see text]. Within this soil group, the Bray-2, DA-4 and DA-10 methods extracted more P and they were less correlated with all the other methods (r = 0.01 to 0.48*). The Bray-1 and Mehlich methods showed good relationships with Olsen, F−- and HCO3−-form resin methods (r = 0.80** to 0.89**) for this soil group, with the exception that Bray-1 solution was more affected by the presence of free carbonates. In the soil group containing more than 0.6% oxalate-Al, the Bray-1, Bray-2 and DA-10 methods extracted more P than the Mehlich, DA-4 or Olsen methods. The F−-form exchange resin extracted more P than that in the HCO3− form. The depressing effect of free iron oxides on the DA-4 method was also observed with the soil group containing more than 0.6% oxalate-Fe. The contents of DA-4-P were less correlated with those of other methods (r = 0.74** to 0.88**) in this soil group. On the other hand, the Olsen, F− and HCO3− resins extracted more of the P-Fe forms from these soils. The DA-4 method was further influenced by the soil organic matter (OM) contents. The relationships between P-Olsen, P-HCO3−-resin with the other chemical methods were also improved by taking into account the contribution of OM contents. Soil texture influenced mostly Bray-2, Bray-1, DA-4 and DA-10 extractable P. The Mehlich, Olsen and F−-resin extractable P was less affected by clay contents while the HCO3−-resin was the most consistant over a wide range of soil textures. Key words: Available-P, anion-exchange resins, new Mehlich extractant, P-forms, soil testing

Removal of Hydrophobic and Hydrophilic Constituents by Anion Exchange Resin

1999 ◽  
Vol 40 (9) ◽  
pp. 207-214 ◽  
Author(s):  
J.-P. Croué ◽  
D. Violleau ◽  
C. Bodaire ◽  
B. Legube
Keyword(s):  
Molecular Weight ◽  
Anion Exchange ◽  
Water Source ◽  
Atomic Ratio ◽  
Size Exclusion ◽  
Salting Out ◽  
Anion Exchange Resins ◽  
Hydrophilic Character ◽  
Exchange Resins

The objective of this work was to compare the affinity of well characterized NOM fractions isolated from two surface waters with strong (gel matrix and macroporous matrix) and weak anion exchange resins (AER) using batch experiment conditions. The structural characterization of the fraction of NOM has shown that the higher the hydrophilic character, the lower the C/O atomic ratio, the lower the SUVA, the lower the aromatic carbon content and the lower the molecular weight. In general (not always), strong AER was more efficient to remove DOC than weak AER. For the same water source (Suwannee River), the higher the molecular weight of the NOM fraction, the lower the affinity with AER. Increasing the ionic strength favored the removal of the hydrophobic NOM fraction (“salting out” effect) while increasing the pH apparently reduced the removal of the hydrophilic NOM fraction. Results were discussed in terms of size exclusion, adsorption, anion exchange and also hydrophobic/hydrophilic repulsion.

scholarly journals Impact of anion exchange adsorbents on regional citrate anticoagulation

2020 ◽  
pp. 039139882094773
Author(s):  
Karin Strobl ◽  
Stephan Harm ◽  
Ute Fichtinger ◽  
Claudia Schildböck ◽  
Jens Hartmann
Keyword(s):  
Anion Exchange ◽  
Regional Citrate Anticoagulation ◽  
Liver Support ◽  
Anion Exchange Resins ◽  
Increased Risk ◽  
Extracorporeal Liver Support ◽  
Target Molecules ◽  
Exchange Resins ◽  
The Impact

Introduction: Heparin and citrate are commonly used anticoagulants in membrane/adsorption based extracorporeal liver support systems. However, anion exchange resins employed for the removal of negatively charged target molecules including bilirubin may also deplete these anticoagulants due to their negative charge. The aim of this study was to evaluate the adsorption of citrate by anion exchange resins and the impact on extracorporeal Ca2+ concentrations. Methods: Liver support treatments were simulated in vitro. Citrate and Ca2+ concentrations were measured pre and post albumin filter as well as pre and post adsorbents. In addition, batch experiments were performed to quantify citrate adsorption. Results: Pre albumin filter target Ca2+ concentrations were reached well with only minor deviations. Citrate was adsorbed by anion exchange resins, resulting in a higher Ca2+ concentration downstream of the adsorbent cartridges during the first hour of treatment. Conclusions: The anion exchange resin depletes citrate, leading to an increased Ca2+ concentration in the extracorporeal circuit, which may cause an increased risk of clotting during the first hour of treatment. An increase of citrate infusion during the first hour of treatment should therefore be considered to compensate for the adsorption of citrate.

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