A fibrous hypercrosslinked sorbent prepared on PP-ST-DVB matrix via post-crosslinking reaction

A fibrous sorbent possessing abundant micropore structure was firstly prepared via post-crosslinking reaction on the PP-ST-DVB original fiber. Its micromorphology and sorptive properties were investigated, and the results demonstrated that the novel fibrous hypererosslinked sorbent has narrow pore-size distribution, small average porous radius （1.90 nm）, high specific surface area （362.31 m^2/g）, and fine sorptive properties for small organic molecules.     

Synthesis of 2-R-1,3-dioxanes, derivatives of functionally substituted aldehydes of vanillin series

By the condensation of substituted aldehydes of vanillin series with 1,3-propanediol in boiling benzene in the presence of sulfo cation exchanger FIBAN K-1 as catalyst functionally 2-R-substituted 1,3-dioxanes were synthesized.     

Effect of the distribution of palladium over the cross section of an ion-exchanger fiber on catalyst activity in a water deoxygenation process

A procedure for the preparation of a fibrous palladium-containing catalyst for the removal of dissolved oxygen from water was developed. This procedure includes the preliminary modification of an anionexchanger fiber with carboxylate ions, which makes it possible to localize metal clusters in a thin subsurface layer of a fiber at the subsequent stages of the ion-exchange introduction of palladium into the carrier and the reduction of palladium. It was found that the higher activity of fibrous palladium-containing catalysts based on the citrate forms of anion exchangers, as compared with that of samples based on the chloride forms, was due to the predominant arrangement of reduced metal clusters on the external surface and an adjacent thin layer of the fiber.     

Flocculating Efficiency of Polyelectrolytes Prepared from Wastes of Nitron Fiber Production

Water-soluble cationic, amphoteric, and anionic polyelectrolytes were prepared from wastes of the Nitron fiber production. The extent to which the polyelectrolytes reduce the turbidity, content of petroleum products, and chemical oxygen demand was studied as a function of polyelectrolyte type and its concentration.     

New nitrogen-and-phosphorus-containing fibrous ion exchangers for water treatment

New nitrogen-and-phosphorus-containing fibrous ion exchangers were produced by two-stage synthesis from Nitron fiber. The ion exchangers are efficient sorbents of heavy and nonferrous metals from aqueous solutions under dynamic conditions.     

Synthesis and sorption properties of new fibrous nitrogen- and phosphorus-containing ion exchangers

Polymer-analogous transformations of a Nitron fiber were studied. These transformations include its amination with ethylenediamine, diethylenetriamine, and tetraethylenetriamine, followed by phosphorylation with PCl₃ under the Kabachnik-Fields reaction conditions. Nitrogen- and phosphorus-containing ion exchangers were examined as sorbents of heavy and nonferrous metals from aqueous solutions, and zinc ions from dilute solutions on the background of calcium ions.     

Synthesis and properties of new N,S-containing fibrous ion exchangers

New N,S-containing fibrous ion exchangers were prepared by polymer-analogous transformations of Nitron fiber, involving amination with polyethylenepolyamines (ethylenediamine and diethylenetriamine), followed by the reaction of the aminated fiber with carbon disulfide. The materials obtained efficiently take up silver ions from multicomponent aqueous solutions of metal ions and from dilute solutions containing calcium ions.     

Application of High-Resolution NMR Spectroscopy in Analyzing Ionites

The ¹H and ¹³C NMR spectra of granulated carboxylic cationite MAC-3 and fibrous anionites FIBAN (A-5, A-7, and A-9) have been investigated. The dependence of the chemical shifts and times of spin–spin relaxation of the water protons and carbon nuclei of MAC-3 on the water content in a sample has been investigated. A comparison of the carbon spectra of polyelectolytes and FIBAN fibrous anionites swollen in water has been made. It is shown that the carbon spectra of the ionites swollen in water represent fairly narrow lines practically for all groups of the skeleton, and therefore the structure of the ionites can be analyzed using a high-resolution NMR.     

Comparison of Fibrous Carboxylic Ion Exchangers in Water Treatment to Remove Heavy Metal Ions

Treatment of drinking water to remove heavy metal ions Pb^{2 +}, Cu^{2 +}, Cd^{2 +}, Co^{2 +}, Ni^{2 +}, and Zn^{2 +} with commercial fibrous carboxylic ion exchangers FIBAN Kh-1, K-3, K-4, and K-5 was studied. Features of metal ion sorption from two-component solutions were determined. A comparative evaluation of the sorption selectivity of FIBAN fibrous ion exchangers with respect to heavy metal ions was made.     

Treatment of the Wastewater of Finishing-and-Dyeing Production Using Polyelectrolyte Flocculants Based on Nitron Fiber Scrap

The performance of FK-1 and FK-3 cationic polyelectrolytes and of new AMF-2 amphoteric polyelectrolyte in treatment of the wastewater of finishing-and-dyeing production was studied as influenced by the concentrations of flocculant and coagulant.