ion exchange modified
Ion Exchange Method for Removal and Separation of …
Ion exchange has been widely applied in technology of chemical separation of noble metal ions. This is associated with dissemination of methods using various ion exchange resins which are …
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Adsorption of Diuron onto Tunisian Clay Modified with DDDMA
In this study, a natural smectite extracted from El Hicha deposit in the Gabes region located in southeast of Tunisia was firstly purified and then modified by ion exchange with didodecyldimethylammonium bromide (DDDMA) under microwave irradiation in order to obtain an efficient organoclay for removing from aqueous solution of diuron. …
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Mechanisms for enhanced transport selectivity of like-charged …
To date, the key mechanisms of ion-ion selectivity in commercial or modified IEMs remain elusive. In this work, we modified a commercial anion exchange membrane (AEM) with a hydrophobic polymer, polypyrrole (PPy), and systematically characterized the properties of PPy-modified IEMs, including water content and …
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Zeolite-based monoliths for water softening by ion exchange
When the ion-exchange is the only active process, ... calcium and magnesium, by natural and alkaline modified pumice stones in single and binary systems. Appl. Surf. Sci. 274, 295–305 (2013).
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Ion-exchange mechanisms and interfacial reaction …
The ion-exchange and associated interfacial reaction mechanisms of silicate glasses are critical in elucidating their aqueous corrosion behaviors, surface …
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A reverse-selective ion exchange membrane for the selective
Specific-ion selectivity is a highly desirable feature for the next generation of membranes. However, existing membranes rely on differences in charge, size and hydration energy, which limits ...
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Chemical physics insight of PPy-based modified ion …
Ion exchange membranes were chemically modified for preventing crossover. The electrical properties differ considering the nature of exchange …
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Electrotransport Characteristics of Polyaniline-Modified Cations
However, the choice of ion-exchange membranes is limited to commercial brands, which makes important the problem of imparting necessary properties to commercial materials by their modification. The various approaches to modifying ion-exchange membranes were analyzed in several publications [2, 13–15].
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Ion-Exchange Materials for Membrane Capacitive Deionization
A complete summary of developments of ion-exchange materials for MCDI is provided, including modified electrodes, polymeric membranes, and nanomaterial-incorporated ion-exchange layers. Additionally, we aim to critically compare the different ion-exchange materials for MCDI, suggesting directions that the ever-expanding field should consider to ...
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Ion-exchange modified zeolites X for selective adsorption …
Zn, Co and Ag modified NaX zeolites were prepared by ion-exchange method to enhance the selective adsorption performances for H 2 S and COS from Claus tail gas. Among all the samples, AgX shows the most excellent adsorption performance, …
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(PDF) Removal of fluoride ions by ion exchange resin: kinetic and
resin. 3.1. Effect of pH on fluoride removal efficiency. Fig. 1 shows the pH effect on the removal. decrease of the removal efficiency, and the highest. fluoride removal was obtained at pH=7 ...
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Ion-exchange modified zeolites X for selective adsorption
Similarly, Chen et al. [58] prepared Ag, Zn, and Co modified NaX zeolites by ion-exchange method and studied their adsorption performance of H 2 S and COS removal from Claus tail gas at 25 • C ...
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Protein adsorption and transport in dextran-modified ion-exchange …
Ion-exchange chromatography (IEC) is an important tool in the large-scale purification of proteins. In efforts to improve performance, significant advantages have been realized through the modification of traditional materials with secondary polymers to which functional groups are attached. ... suggests that the accessible surface area of SP FF ...
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Ion Exchange Resin Modified Carbon Paste Electrode …
Ion Exchange Resin Modified Carbon Paste Electrode Applied to Simultaneous Determination of Cd (II) and Pb (II) - IOPscience. Journal of The …
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ION EXCHANGE
The kinetics of ion exchange are governed by either a diffusion or mass action mechanism, depending on which is the slowest step. Diffusion of ions in the external solution is termed liquid film control, …
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Graphene Oxide/Polyethyleneimine-Modified Cation Exchange …
The ion selectivity of the modified membranes is shown in Figure 6e, which shows that the ion selectivity of GO-PEI membranes increases and then decreases with increasing deposition time. The ion selectivity of the PEI (20) membrane was only 5.74, which was lower than that of GO-PEI (20), further indicating that GO plays an important …
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Adsorption onto zeolites: molecular perspective | SpringerLink
Chen X, Shen B, Sun H (2018) Ion-exchange modified zeolites X for selective adsorption desulfurization from Claus tail gas: experimental and computational investigations. Microporous Mesoporous Mater 261:227–236. CAS Google Scholar
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Journal of Applied Polymer Science | Wiley Online Library
SURFACE-MODIFIED ION-EXCHANGE MEMBRANES. The modified surfaces or the additional layers deposited on the membrane surface have several characteristics. The characteristics of the modified surface will determine the performance of the IEM. Sometimes, the characteristics of the modified layer are required to obtain a …
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Natural Zeolites in Water Treatment – How Effective is Their Use
1.1.3. Drinking and grey water treatment. Several conventional methods are used for the removal of pollutants from drinking water, such as coagulation followed by filtration, membrane processes and ion exchange. Adsorption methods proved to be effective, economically efficient, easy to perform and construct.
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Ion-exchange reaction construction of carbon nanotube …
Ion-exchange reaction construction of carbon nanotube-modified CoNi@MoO2/C composite for ultra-intense and broad electromagnetic wave …
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A novel modified method for the efficient removal of Pb and Cd …
It revealed that magnesium modified biochar significantly enhanced the ion exchange capacity. Additionally, there was a significant increase in the Q p of MgBC400 compared to BC400 ( Fig. 6 ). For example, compared with BC400, the Q p of MgBC400 increased by 214.4 mg/g in the adsorption of Pb.
ادامه مطلبAn overview of amphoteric ion exchange membranes for …
Apart from Nafion, partially fluorinated ion exchange membranes were applied in VRB due to integrated chemical stability and relatively low cost. and were modified by covalent radiation grafting to obtain high performance membranes. For instance, the ion exchange groups were grafted into PVDF films or ETFE films [121, 122].
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Acidic properties of ZSM-5 zeolite modified with Ba2
The acidity of a ZSM-5 zeolite was modified with Ba 2+, Al 3+ and La 3+ ion-exchange. The ion-exchange process was repeated three times and after each ion-exchange cycle the samples were calcined. The acidity of the modified zeolites was characterized by IR and MAS NMR spectroscopy. The number of strong Brönsted acid …
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Size Exclusion and Ion Exchange Chromatographic …
high-purity materials that have been isolated by LC-based ion-exchange prior to aliquoting and sale. They were synthesized with a 5′ endcap, poly A tail, and 5-methoxyuridine residues. Ramucirumab (Vectibix), rituximab (Rituxan), eculizumab (Soliris), and trastuzumab emtansine (Kadcyla) were obtained
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Preparation of chlorocholine chloride/urea deep eutectic solvent
Ion exchange process and HPLC analysis. The ion exchange property of the ClChCl–urea-modified silica was tested by shaking the material with 1.0 mL of a ferulic acid solution. After ion exchange between the DES-modified silica and ferulic acid, the change in the ferulic acid concentration in the solution was analyzed by HPLC.
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Cation exchange in metal-organic frameworks (MOFs): The hard …
[155] Herein, a pillared-paddlewheel Zn 2 (tmbdc) 2 (bpy) displayed a complete linker, pillar ligand, and metal ion exchange to an entirely new linker, new pillar ligand and new metal ions, Fig. 22. Initially, the tmbdc was replaced by 2,6-naphthalenedicarboxylate (ndc) upon soaking in 1 M DMF solution of ndc at 80 °C for 2 d, to Zn 2 (ndc) 2 ...
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Improved desorption performance of NaA zeolite by rare earth
The ion exchange degrees of Nd-modified and binary La/Nd modified NaA zeolites were much higher than that of Re-modified 13X zeolite (27.6%) reported by the literature, the reaction time was only 20 min, which indicates the superiority of microwave-assisted ion exchange method.
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Advancing electrodeionization with conductive ionomer binders …
Electrodeionization (EDI) is an electrically driven separations technology that employs ion-exchange membranes and resin particles. Deionization occurs under the influence of an applied electric ...
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Ion Exchange Resin Technology in Recovery of Precious …
First Online: 05 February 2019. 1178 Accesses. 6 Citations. Abstract. Ion exchange technology has received outstanding attention in a wide variety of industries, including …
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Removal of heavy metal ions from aqueous system by …
Abstract Pollution due to heavy metals is currently a serious problems affecting water bodies. The removal of heavy metals is of great concern due to their toxicity at trace levels and accumulation in the …
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