scholarly journals Silver-containing Cation Exchange Resin: Synthesis and Application

2021 ◽  
Author(s):  
Renat KHAYDAROV ◽  
Murodjon ABDUKHAKIMOV ◽  
Ilnur GARIPOV ◽  
Ilkham SADIKOV ◽  
Praveen Thaggikuppe KRISHNAMURTHY ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Spherical Shape ◽  
Climatic Conditions ◽  
Water Softening ◽  
Biofilm Growth ◽  
Cation Resin ◽  
Resin Beads ◽  
Exchange Resins

Cation exchange resins are widely used for water softening and demineralization all over the world. Deposition, metabolism, and growth of bacteria and fungi on the resin beads cause capacity and performance losses, especially during repeated use in cyclic and long-term operations. Over the last decades, modification of different materials by silver nanoparticles (AgNPs) has demonstrated to present significant opportunities in mitigating biofouling problems. The paper deals with a novel facile technique of introducing silver colloids (AgC) into cation exchange resin, providing the formation of silver micro- and nano-inclusions on the cation resin beads. The scanning electron microscope (SEM) measurements have confirmed a spherical shape and uniform distribution of AgC (50 – 1000 nm) on the surface of the resin. To evaluate the antibacterial and fungicidal properties of AgC on the cation resin beads, we have used Aureobasidium sp., Penicillium sp., and Staphylococcus aureus cultures. AgC coating has proved to efficiently prevent bacteria/biofilm growth on the cation resin beads and thereby significantly increase the service life of the cation exchange resin, especially in hot climatic conditions. Possible antibiofouling mechanisms of the modified nanocomposite cationite have been discussed. Since 2020, the modified silver-containing cationite has been successfully utilized for water softening systems of boiler equipment in Uzbekistan, demonstrating the suitability of the suggested facile coating technique for reducing fouling of cation-exchange resin.

Kinetics of LIS-100 Cation Exchange Resin to Remove Reaction Substrate of Non-Enzymatic Browning in Clarified Apple Juice

2013 ◽  
Vol 699 ◽  
pp. 770-774
Author(s):  
Jian Hua Yi ◽  
Mei Li Li ◽  
Zhen Bao Zhu
Keyword(s):  
Amino Acids ◽  
Cation Exchange ◽  
Apple Juice ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Enzymatic Browning ◽  
Adsorption Parameters ◽  
Cation Exchange Resins ◽  
Exchange Resins ◽  
Dynamic Exchange

In order to inhibit non-enzymatic browning in clarified Fuji apple juice during storage, four kinds of cation exchange resins were compared for their abilities to exchange and remove amino acids, the reaction substrates of non-enzymatic browning in apple juice. The favorite resin, LSI-100, was screened to carry out static and dynamic adsorption experiments. The results showed that LSI-100 cation exchange resin had the best capacity for adsorption and removal amino acids. The equilibrium time of LSI-100 resin for amino acids was 3.5h.And the isotherm of LSI-100 resin could be described by Freundlich at 20°C. Additionally, the flow rates, temperature and concentrations of amino acids in apple juice affected the dynamic kinetic curves of LSI-100 cation exchange resin and the better dynamic exchange and adsorption parameters were as follows: flow rate 4BV/h, temperature 50°C,and amino acid concentration 30mg/100g apple juice.

Development of pyrolytic monolithic carbon composites for the conditioning of spent ion exchange resins

2012 ◽  
Vol 1475 ◽  
Author(s):  
Pamela B. Ramos ◽  
Néstor O. Fuentes ◽  
Vittorio Luca
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Processing Parameters ◽  
Ion Exchange Resin ◽  
Mathematical Functions ◽  
Waste Forms ◽  
Resin Beads ◽  
Temperature Ramp ◽  
Exchange Resins

ABSTRACTThe pyrolysis of ion exchange resin beads that are used for the purification of water in reactor primary- and secondary-cooling circuits can result in stable and leach resistant carbonaceous products. However, free flowing beads are less desirable waste forms for disposal in sub-surface or surface repositories than monolithic masses of low porosity. We have investigated the pyrolysis of polymeric resin – cation exchange resin composites to give mechanically robust and chemically durable monolithic carbonaceous waste forms that are suitable for repository disposition. Also investigated was the dependence of product properties on various processing parameters (temperature ramp and final temperature). As a first approach, epoxy resins were used for the preparation of monoliths since such resins cure at room temperature and result in a relatively high carbon yield. Carbonaceous monolithic products were prepared at 400, 500, 600, 700 and 800 °C using a temperature ramp of 2°C/min. The products were maintained at the chosen temperatures for a period of one hour. Mass losses, volume reduction, hardness and compressive strength were measured and mathematical functions are proposed to describe the measured values of these properties. The carbon monoliths were observed to be mechanically robust.

scholarly journals Cation-exchange resins as heterogeneous catalysts for the synthesis of 1,3-butadiene from propylene and formaldehyde

2021 ◽  
Vol 8 (2) ◽  
pp. 20218201
Author(s):  
T. M. Kutuzova ◽  
O. M. Kuznetzova ◽  
R. A. Akhmedyanova
Keyword(s):  
Cation Exchange ◽  
Heterogeneous Catalysts ◽  
Isopropyl Alcohol ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Cyclic Trimer ◽  
Cation Exchange Resins ◽  
Technological Stage ◽  
Exchange Resins ◽  
By Products

The possibility of using the cation-exchange resin Lewatit K2420 as a catalyst for the synthesis of 1,3-butadiene from isopropyl alcohol and formaldehyde solution in one technological stage has been shown. The regularities of the process have been established and the influence of the formaldehyde form (a cyclic trimer 1,3,5-trioxane and a 37% solution in water) on the composition of the reaction mass and the yield of the main and by-products has been assessed. It has been shown that the Lewatit K2420 heterogeneous catalyst showed catalytic activity in all reactions occurring in the synthesis of 1,3-butadiene, including the decomposition of 1,3,5-trioxane, dehydration of isopropyl alcohol into propylene,  condensation of propylene and formaldehyde, dehydration of 3-butene-1-ol, decomposition of 4-methyl-1,3-dioxane, etc.

Rapid Separation of the Components of Nucleic Acids and Urine by High-Resolution Liquid Chromatography

1970 ◽  
Vol 16 (8) ◽  
pp. 667-676 ◽  
Author(s):  
A C Burtis ◽  
M N Munk ◽  
F R MacDonald
Keyword(s):  
Liquid Chromatography ◽  
Nucleic Acid ◽  
Ion Exchange ◽  
Cation Exchange ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Dead Volume ◽  
Rapid Separation ◽  
Exchange Resins ◽  
System Operating

Abstract The improved separations of nucleic acid components obtained with two recently developed liquid chromatography systems are presented. An ion-exchange system operating at 3000 lb/in.2, developed for use with pellicular ion-exchange resins, separates the 2',3'-ribonucleotides of the four common bases in 55 min, the 5'-deoxynucleotides in 10 min, a mixture of four dinucleotides in 30 min, and a mixture of AMP, ADP, and ATP in 3.5 min. The difficult separation of the mono-, di-, and triphosphates of the four nucleosides requires 2.5 h with the pellicular anion-exchange resin. The four bases, or their nucleosides, are separated in less than 15 min with pellicular cation-exchange resin. The system has been modified to allow separation of more than 90 uv-absorbing constituents in human urine. A versatile, nonpulsating system, operated at 5000 lb/in.2, separates the ribonucleosides in less than 5 min on small-particle, conventional cation-exchange resin. Resins from three separate sources performed comparably, but parameters such as pH, temperature, and linear velocity must be optimized for each. Both systems are designed with a minimum of dead volume and use a sensitive uv photometer. The 0.02 absorbance unit full-scale sensitivity and 1-cm pathlength of the uv photometer allow analysis of picomole quantities of nucleic acid components.

scholarly journals Isolation and radiochemical purification of samarium isotopes using ion exchange resins АВ 17×8 AND KU-2

2021 ◽  
Vol 21 (4) ◽  
pp. 368-377
Author(s):  
Sayan E. Salmenbayev ◽  
◽  
Nazgul K. Nurgaysinova ◽  
Gani M. Yessilkanov ◽  
Аray E. Temirzhanova ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Chemical Elements ◽  
Cation Exchange Resin ◽  
Internal Exposure ◽  
Ion Exchange Resins ◽  
Exchange Resins

The relevance of the research is caused by the need to develop a methodological base for determining 151Sm content in the soil cover of radioactively contaminated territories of Kazakhstan. The developed method for the determining of 151Sm will make it possible to assess the levels of soil contamination with this radionuclide, to determine the character of its spatial distribution, to allow estimating the internal exposure doses for the personnel and the population. The aim of the research is to carry out the isolation and radiochemical purification of samarium isotopes from acid solutions via using ion-exchange resins AV 17×8 and KU-2. Objects: salt solutions based on nitric and hydrochloric acid containing the stable isotopes of some natural, artificial β-emitters and isotopes of U and Th. The concentrations of nitric and hydrochloric acids were equal to the concentrations of the same acids used in the routine analysis of Pu and Am. Concentrations of chemical elements were determined using the Agilent 7700x quadrupole mass spectrometer and the iCAP 6300 Duo atomic emission spectrometer. The results of the experiments on the isolation and radiochemical purification of samarium isotopes from acidic solutions using anion-exchange resin AV 17×8 and cation-exchange resin KU-2 have been presented. It has been shown that the Sm-fraction can be purified from alkaline elements, Tl and U isotopes using the KU-2 cation-exchange resin. In turn, the isotopes U, Fe and Co can be removed using an anion exchange resin in 9M HCl media.

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