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Removal of reactive dye brilliant red HE-3B from aqueous solutions by hydrolyzed polyacrylonitrile fibres: equilibrium and kinetics modelling

“…Chemically modified fibres, having high external specific surface area, high adsorption rate and good selectivity, controlled by the nature of the functional groups grafted onto the surface of the fibre, have been investigated as sorbents for heavy metal removal from aqueous media [12,13], but their applications for the removal of dyes from wastewater have not been reported. Many fibrous sorbents for selective removal and recovery of various metal ions have been prepared from polyacrylonitrile fibre, a cheap commercial synthetic product, widely used in the textile industry as well as in production of carbon fibres [14,15].…”

Non-Woven Ion-Exchange Fibrous Materials in Air Sanitary Cleaning

“…In the post-Soviet space, the main producers of IFM are the Russian Federation and the Republic of Belarus [14,18]. Abroad, little attention is paid to ion-exchange fibrous materials, except for China, where CATALON materials are produced [18] (similar in properties to the Belarusian PANION), and Japan -IONEX [7,21]. In addition, the United States [6], Japan [22,23], South Korea [24], Iran [25], Uzbeki-stan [15,26], Ukraine [1,3,4,8,9,12,27] and others, develop methods for producing IFMs, modifying them and study their physicochemical properties.…”

“…Fibrous anion-exchangers very efficiently absorb mists of hydrohalic acids by neutralizing the latter with hydroxyl, carbonate or hydrocarbonate forms of strongly basic anion-exchangers (reactions 20-23) and primary, secondary or tertiary amino groups of weakly basic anionites (reaction 24) [3,4,7,13,[54][55][56]. The absorption process largely depends on the presence of moisture in the system, as water is a direct participant in the interaction of HCl with the functional groups of fibrous anion-exchange resins [13,56].…”

“…Due to the short time to achieve sorption equilibrium in the case of NSFM, the rate of sorption of harmful components from gaseous media is several times higher than the rate of similar processes on granular adsorbents, which allows to purify air using thin layers of material. Due to the low resistance to air flow, such materials are used to equip gas cleaning equipment, including respirators -personal respiratory protective equipment (PRPE) from toxic gases [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Composite sorption filter bags with fibre and disperse fillers

“…Information on the successful use of pilot-industrial units with chemisorption fibres for removal of toxic emissions (HF, HCl, NH 3 , CO, SO 2 , acid aerosols) from air; capture of copper, nickel, cobalt, lead, and zinc ions in electrolysis; extraction of silver, gold, platinum, palladium, and lithium from aqueous medium in different sectors; treatment of drinking water to remove heavy metal ions and radionuclides, sulfate, nitrate, chloride anions, bacterial pathogens, etc., is reported in [2]. The author drew the attention of investigators to the necessity of obtaining materials with a higher content of chemically active groups while preserving the mechanical properties that ensure their processing into textile articles.…”