Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Effect of ion exchange resin particle size on homogeneity and leachability of Cs and Co in polymer waste form.

ABSTRACT: We report the size effect of ion exchange resins (IERs) on Cs and Co distribution in polymer waste forms. Ball mill ground IERs (BG) waste form resulted in relatively better homogeneous waste distribution and displayed superior Cs and Co leachability indexes compared with the same polymer waste form prepared with non-ground IERs (NG).

SUBMITTER: Kim J

PROVIDER: S-EPMC8693867 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

ACCESS DATA

Json Xml

Publications

Effect of ion exchange resin particle size on homogeneity and leachability of Cs and Co in polymer waste form.

Kim Jueun J Singh Bhupendra Kumar BK Um Wooyong W

RSC advances 20210113 5

We report the size effect of ion exchange resins (IERs) on Cs and Co distribution in polymer waste forms. Ball mill ground IERs (BG) waste form resulted in relatively better homogeneous waste distribution and displayed superior Cs and Co leachability indexes compared with the same polymer waste form prepared with non-ground IERs (NG). ...[more]

PMID: 35424231

Similar Datasets

Correlation between Na-Cs Ion Exchange Properties in the Alkaline Form and Acid Strength in the Proton Form of Zeolite.

Project description:The ion exchange function of zeolite is useful for such a purpose as the removal of radioactive Cs species from water. In the very early days of zeolite science, the affinity of zeolites for metal cations was explained based on geometry. After the explanation presented above was proposed, many new zeolites and related materials were discovered or synthesized. Furthermore, it has become clear that the chemical nature of the ion exchange sites is strongly dependent on the framework topology. In this study, the ion exchange behavior between Na-form zeolites with different framework topologies and Cs-containing aqueous solutions was analyzed, and the equilibrium constant was calculated based on the Langmuir type equation to investigate the influence of the chemical nature of the zeolite framework on ion selectivity. The equilibrium constants at room temperature were in the order FAU < LTA < MFI < YFI < MOR. This order is the same as the order of Bro̷nsted acid strengths in the corresponding proton form zeolites. It is suggested that the delocalization of charge around the ion exchange site stabilizes a large cation whose charge is delocalized. In contrast, the equilibrium constant was not related to the pore and cavity size. This opens new insight into the influence of the chemical nature of zeolite on the affinity to cation.

| S-EPMC11411716 | biostudies-literature

Effect of ion form of the ion-exchange resin on ε-poly-l-lysine purification from microbial fermentation broth.

Project description:ε-Poly-l-lysine (ε-PL) is an added-value natural product with widespread application in the fields of food, pharmaceuticals and biopolymer materials. However, the high production cost reduces its application. To improve the efficiency of ε-PL purification for decreasing the cost of downstream processes, the ion form of the ion-exchange resin, which is widely used for ε-PL purification, was investigated systematically in this study. Among eleven cation-exchange resins tested, the Amberlite IRC-50 resin offered the best adsorption capability and the highest desorption ratio. The adsorption kinetics of IRC-50 resin with H+, Na+ and NH4 + ion forms followed a pseudo-second-order model. The dynamic adsorption and desorption parameters of ε-PL were optimized with a column packed with IRC-50 resin with Na+ and NH4 +. It is suggested that NH4 + is the optimal ion form of IRC-50 resin for ε-PL extraction. Under optimal conditions, the IRC-50 resin with NH4 + achieved the highest ε-PL adsorption capability, purity and recovery ratio of 307.96 mg g-1, 76.52% and 96.2%, respectively. After further purification, a final ε-PL purity of 97.10% was achieved with a total recovery ratio of 66.01%. This is the first report on improving the ε-PL purification efficiency through optimizing the ion form of the ion-exchange resin. Moreover, it would offer guidance for other natural product recovery processes by ion-exchange chromatography.

| S-EPMC9063540 | biostudies-literature

Properties of Particle Boards Containing Polymer Waste.

Project description:Nowadays, a significant increase in interest in renewable energy sources can be observed. Wind farms have been one of the solutions representing this trend for many years. One of the important elements of windmills is the blades. The data indicate that what to do with the blades after their use is a global problem, and so it is important to find a way to recycle them. Hence, this work aimed to use these blades in the production of wood-based materials. Two fractions of a fragmented blade were used for the tests: a small one and large one. Boards characterized by densities of 650 kg/m3 and 700 kg/m3 were produced, in which the assumed substitution of the wood material with a polymer was 20% or 40%. Mechanical properties such as bending strength (MOR), modulus of elasticity (MOE), and internal bond strength (IB) were investigated. The 2S65 variant achieved the highest static bending strength and a modulus of elasticity of 2625 N/mm2. The second best result was noted for the 4S65 variant, which was significantly different from the 2S65 variant. In the case of the variants with a density of 700 kg/m3, no significant differences were found and their results were significantly lower. Moreover, research on thickness swelling (TS) after 24 h of immersion and water absorption (WA) were also conducted. The obtained results indicate that the manufactured boards are characterized by good physical and mechanical properties.

| S-EPMC10343619 | biostudies-literature

Estimating and leveraging protein diffusion on ion-exchange resin surfaces.

Project description:Protein mobility at solid-liquid interfaces can affect the performance of applications such as bioseparations and biosensors by facilitating reorganization of adsorbed protein, accelerating molecular recognition, and informing the fundamentals of adsorption. In the case of ion-exchange chromatographic beads with small, tortuous pores, where the existence of surface diffusion is often not recognized, slow mass transfer can result in lower resin capacity utilization. We demonstrate that accounting for and exploiting protein surface diffusion can alleviate the mass-transfer limitations on multiple significant length scales. Although the surface diffusivity has previously been shown to correlate with ionic strength (IS) and binding affinity, we show that the dependence is solely on the binding affinity, irrespective of pH, IS, and resin ligand density. Different surface diffusivities give rise to different protein distributions within the resin, as characterized using confocal microscopy and small-angle neutron scattering (length scales of micrometer and nanometer, respectively). The binding dependence of surface diffusion inspired a protein-loading approach in which the binding affinity, and hence the surface diffusivity, is modulated by varying IS. Such gradient loading increased the protein uptake efficiency by up to 43%, corroborating the importance of protein surface diffusion in protein transport in ion-exchange chromatography.

| S-EPMC7132105 | biostudies-literature

Water-Gated Transistor Using Ion Exchange Resin for Potentiometric Fluoride Sensing.

Project description:We introduce fluoride-selective anion exchange resin sorbents as sensitisers into membranes for water-gated field effect transistors (WGTFTs). Sorbents were prepared via metal (La or Al)-loading of a commercial macroporous aminophosphonic acid resin, PurometTM MTS9501, and were filled into a plasticised poly(vinyl chloride) (PVC) phase transfer membrane. We found a potentiometric response (membrane potential leading to WGTFT threshold shift) to fluoride following a Langmuir-Freundlich (LF) adsorption isotherm with saturated membrane potential up to ~480 mV, extremely low characteristic concentration c1/2 = 1/K, and picomolar limit of detection (LoD), even though ion exchange did not build up charge on the resin. La-loading gave a superior response compared to Al-loading. Membrane potential characteristics were distinctly different from charge accumulating sensitisers (e.g., organic macrocycles) but similar to the Cs+ (cation) selective ion-exchanging zeolite mineral 'mordenite'. We propose a mechanism for the observed threshold shift and investigate interference from co-solutes. Strong interference from carbonate was brought under control by 'diluting' metal loading in the resin. This work sets a template for future studies using an entirely new 'family' of sensitisers in applications where very low limit of detection is essential such as for ions of arsenic, mercury, copper, palladium, and gold.

| S-EPMC7601498 | biostudies-literature

Anion Exchange Impedes Subsequent Cation Exchange: Ion Mobility Is Altered by Vacancies and Ion Size.

Project description:One method of achieving spatially specific, multi-component nanoheterostructures is to combine multiple forms of post-synthetic modification. Applying cation or anion exchange to Cu2-xS nanorods creates complex nanoheterostructures. Combining such anion and cation exchanges generates a system which uncovers the interplay between these two processes and understands the cooperativity between postsynthetic modifications more broadly. Cd2+ exchange was carried out on various plasmonic and nonplasmonic Cu2-xS/Cu2-xTe nanoheterostructures to test how the presence of Te2- ions would affect the extent of Cd2+ incorporation. Three hypotheses were presented for how the presence of Cu2-xTe could alter the incorporation of Cd2+ and these were used to interpret the observed changes in the extent of Cd2+ exchange and crystalline phase of the resulting particles. We found that Te2- anion exchange impedes subsequent Cd2+ cation exchange. Low extents of Te2- exchange cause a phase change where ion mobility is slowed by a decrease in Cu+ vacancies. Higher extents of Te2- exchange slow ion mobility due to the presence of large Te2- ions.

| S-EPMC11752502 | biostudies-literature

Resin-Loaded Heterogeneous Polyether Sulfone Ion Exchange Membranes for Saline Groundwater Treatment.

Project description:Arid areas often contain brackish groundwater that has a salinity exceeding 500 mg/L. This poses several challenges to the users of the water such as a salty taste and damage to household appliances. Desalination can be one of the key solutions to significantly lower the salinity and solute content of the water. However, the technology requires high energy inputs as well as managing waste products. This paper presents the fabrication of ultrafiltration heterogeneous ion exchange membranes for brackish groundwater treatment. Scanning electron microscopy (SEM) images showed a relatively uniform resin particle distribution within the polymer matrix. The mean roughness of the cation exchange membrane (CEM) and anion exchange membrane (AEM) surfaces increased from 42.12 to 317.25 and 68.56 to 295.95 nm, respectively, when resin loading was increased from 1 to 3.5 wt %. Contact angle measures suggested a more hydrophilic surface (86.13 to 76.26° and 88.10 to 74.47° for CEM and AEM, respectively) was achieved with greater resin loading rates. The ion exchange capacity (IEC) of the prepared membranes was assessed using synthetic groundwater in a dead-end filtration system and removal efficiency of K+, Mg2+, and Ca2+ were 56.0, 93.5, and 85.4%, respectively, for CEM with the highest resin loading. Additionally, the anion, NO3- and SO42- removal efficiency was 84.2% and 52.4%, respectively, for the AEM with the highest resin loading. This work demonstrates that the prepared ultrafiltration heterogeneous ion exchange membranes have potential for selective removal for of ions by ion exchange, under filtration conditions at low pressure of 0.05 MPa.

| S-EPMC9416794 | biostudies-literature

Photochemical Transformations with Iodine Azide after Release from an Ion-Exchange Resin.

Project description:This report discloses the photochemical homolytic cleavage of iodine azide after its formation following release from polymer-bound bisazido iodate(I) anions. A series of radical reactions are reported including the 1,2-functionlization of alkenes and the unprecedented chemoselective oxidation of secondary alcohols in the presence of primary alcohols.

| S-EPMC7384096 | biostudies-literature

Multifaceted Ion Exchange Resin-Supported Hydrogen Fluoride: A Path to Flow Hydrofluorination.

Project description: Not available

| S-EPMC6688644 | biostudies-literature