Application of the Remote Interaction Effect and Molecular Imprinting in Sorption of Target Ions of Rare Earth Metals

The goal of the present work is a comparative study of the effectiveness of the application of intergel systems and molecularly imprinted polymers for the selective sorption and separation of neodymium and scandium ions. The following physico-chemical methods of analysis were used in this study: colorimetry and atomic-emission spectroscopy. The functional polymers of polyacrylic acid (hPAA) and poly-4-vinylpyridine (hP4VP) in the intergel system undergo significant changes in the initial sorption properties. The remote interaction of the polymers in the intergel system hPAA–hP4VP provides mutual activation of these macromolecules, with subsequent transfer into a highly ionized state. The maximum sorption of neodymium and scandium ions is observed at molar ratios of 83%hPAA:17%hP4VP and 50%hPAA:50%hP4VP. Molecularly imprinted polymers MIP(Nd) and MIP(Sc) show good results in the sorption of Nd and Sc ions. Based on both these types of these macromolecular structures, principally new sorption methods have been developed. The method based on the application of the intergel system is cheaper and easier in application, but there is some accompanying sorption (about 10%) of another metal from the model solution during selective sorption and separation. Another method, based on the application of molecularly imprinted polymers, is more expensive and the sorption properties are higher, with the simultaneous sorption of the accompanying metal from the model solution.

Results of the use of selective adsorption of endotoxin in the complex treatment of surgical sepsis and septic shock.

Objective. To estimate the results of the use of LPS-adsorption in the complex treatment of surgical or obstetric sepsis and septic shock and to determine the risk factors for the development of lethal outcomes. Materials and methods. Since 2014, twenty-nine patients with surgical or obstetric sepsis and septic shock have been treated at the Perm Regional Clinical Hospital using selective endotoxin adsorption in addition to conventional medical therapy. Endotoxin elimination was performed using hemoperfusion with the Alteco LPS Adsorber (Sweden). The patients were divided into two groups according to the final results of the treatment. The data of clinical and laboratory examinations were compared before and 24 hours after LPS elimination. Results. Based on the correlation analysis, the most significant risk factors for the development of fatal outcomes are identified. It was found that neither the initial scores on the APACHE, SOFA scale, nor the level of CRP, PCT, EAA have a significant correlation with the lethal outcome. The only indicator before LPS-adsorption that has a direct correlation of the average value with the fatal outcome is the initial dose of norepinephrine. In our study, the mortality rate depends on the decrease in SOFA scores and its components in 24 hours after the procedure. Patients with the lower score after LPS-adsorption would have lower mortality. The predictors of ineffectiveness of treatment, despite the LPS-adsorption, were an unreliable decrease in the dose of vasopressors and the level of PCT, light improvements in the oxygenation index, the presence of bacteremia, septic shock and the delayed procedure. Conclusion. In surviving patients with surgical sepsis and septic shock, the use of LPS-adsorption in complex treatment significantly improved the function of the cardiovascular and respiratory systems, reduced the level of PCT. The risk factors for the development of lethal outcomes were the initial severity of cardiovascular insufficiency, the selective sorption of endotoxin with a delay, the presence of bacteremia, septic shock, insignificant decrease in SOFA scores and the level of PCT after selective sorption of endotoxin.

Cyclohexanohemicucurbit[8]uril forms inclusion complexes with heterocycles and removes sulfuric guests from water via solid-phase extraction

We found that cyclohexanohemicucurbit[8]uril encapsulates five- and six-membered sulfur- and oxygen-containing unsubstituted heterocycles and can be used as a selective sorption material for the extraction of sulfur-heterocycles like 1,3-dithiolane and α‑lipoic acid from water.

Selective sorption of PAHs from TX100 solution by resin SP850: effects of TX100 concentrations and PAHs solubility

Quantitative correlations of S* and CopTX100, capable for predicting selective sorption of PAHs by SP850 from TX100 solution were established.

Covalent triazine frameworks for the selective sorption of palladium from highly acidic radioactive liquid wastes

Efficient palladium recovery from high level liquid wastes (HLLW) is of increasing priority for sustainable development and addressing issues in radioactive wastes treatment. However, searching for robust materials for palladium...