scholarly journals Ion exchange resin selection for concentration and purification of uranium leached by sulphuric acid solution

2015 ◽  
Vol 5 (2) ◽  
pp. 33-38
Author(s):  
Quang Thai Le ◽  
Minh Tuan Pham ◽  
Nguyen Quynh Trinh ◽  
Khac Tuan Vu ◽  
Hong Ha Nguyen ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Low Cost ◽  
Acid Leaching ◽  
Ion Exchange Resin ◽  
Exchange Capacity ◽  
High Price ◽  
Strong Base ◽  
Total Exchange Capacity ◽  
Total Exchange ◽  
Uranium Solution

Ion exchange is one of the most popular techniques for recovery and purification of uranium from sulfuric acid leaching solution, especially for recovery of uranium from a low uranium containing solutions. Resins commonly used are strong base or weak base anion resins with amine functional group. The anionic form of resins may be NO3-, Cl- , SO­42- or OH-. The selection of  a resin depends on the uranium total exchange capacity, selectivity and the cost. The previous studies often use Amberlite IRA-420 for concentration and purification of uranium solution from Pa Lua sandstone ores. This is a good and suitable resin but high price. To diversify the resins and reduce the costs, instead of IRA-420, the authors tested two commercial resins Indion GS300 (India) and Purolite A400 (UK) in the processing of uranium solution from sandstone ores. The results showed that the uranium total exchange capacity of  these resins is only about 80 - 85% over  Amberlite IRA-420, but these resins should be able to be used instead of Amberlite IRA-420 due to their low cost and availability in Vietnam.

Adsorption and ion exchange of some groundwater anion contaminants in an amine modified coconut coir

1997 ◽  
Vol 35 (7) ◽  
pp. 89-95 ◽  
Author(s):  
Aloysius U. Baes ◽  
Tetsuji Okuda ◽  
Wataru Nishijima ◽  
Eiji Shoto ◽  
Mitsumasa Okada
Keyword(s):  
Ion Exchange ◽  
Low Cost ◽  
Exchange Capacity ◽  
Batch Adsorption ◽  
Ion Exchange Capacity ◽  
Strong Base ◽  
Chromium Vi ◽  
Freundlich Equation ◽  
Adsorption Data ◽  
Coconut Coir

The adsorption of nitrate, chromium (VI), arsenic (V) and selenium (VI) anions in an amine modified coconut coir (MCC-AE : with secondary and tertiary amine functionality) were studied to determine the capability of this easily prepared and low-cost material in removing typical groundwater anion contaminants. Batch adsorption-ion exchange experiments were conducted using 200 mg MCC-AE, initially containing chloride as the resident anion, and 50 ml of different anion-containing water of varying concentrations. It is presumed, at this low pH, that only SeO42− remained as a divalent anion, while monovalent species H2AsO4− and HCrO4− predominated in their respective exchanging ion solutions. The adsorption data were fitted using the Freundlich equation and maximum adsorption for each anion was estimated using their respective Freundlich equation constants. MCC-AE exhibited preference for divalent Cr (VI) and Se (VI) anions compared with the Cl− resident ion. Maximum As (V) adsorption was 0.086 mmol/g, while maximum adsorption of Cr (VI), NO3− and Se (VI) anions was 0.327 mmol/g, 0.459 mmol/g, and 0.222 mmol/g, respectively. The ion exchange capacity of MCC-AE is estimated, based on its exchange capacity for nitrate, to be within 0.46 mmol of positive charges per gram. Similar adsorption experiments were conducted for comparison using commercial chloride-form Amberlite IRA-900 strong base (quaternary amine functionality) anion exchanger, with an exchange capacity of 4.2 meq/g. Maximum adsorption of the different ions in IRA-900 was about 3 times higher for NO3−, 9 times higher for Se (VI), 10 times higher for As (V) and 9 times higher for Cr (VI), than that in MCC-AE. Differences in the ion exchange behavior of MCC-AE and IRA-900 were probably due to the different amine functionalities in the two exchangers. The results suggest that MCC-AE may be used as a low-cost alternative adsorbent/ion exchanger for treatment of anion contaminants in groundwater.

Preparation of Nanometer MgO by Ion Exchange Resin Method

2009 ◽  
Vol 79-82 ◽  
pp. 509-512 ◽  
Author(s):  
Min Yang ◽  
Hai Jun Guo ◽  
Yan Sheng Li ◽  
Le Zhou
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Low Cost ◽  
Ion Exchange Resin ◽  
Raw Material ◽  
High Yield ◽  
Preparation Methods ◽  
Strong Base ◽  
Average Size ◽  
Resin Method

In this paper, nanometer MgO powder was prepared by using MgCl2•6H2O as the raw material, and environmental benign strong-base anion exchange resin as the induced-precipitation regent. The influence of the concentration of MgCl2 solution, drying method, calcination temperature and time on particle size and physico-chemical features of MgO was studied. The optimal technical conditions were obtained. The XRD and SEM results show that the nanometer MgO prepared under the optimal technical conditions has regular hexagonal lamellar structure, and is composed of nanocrystals with average size between 10 to 25 nm. The existence of dry N2 prevented the sintering of MgO during decomposition processing of Mg(OH)2. Compared with the other nanometer MgO preparation methods, ion exchange resin method has the advantages of low cost, low pollution, high yield and environmental benign; therefore, it appears to be a promising method for the industrial manufacturing of nanometer MgO.

scholarly journals Contribution of ion-exchange transformation of the adsorbed complex of atmospheric aerosols to the formation of seawater salt composition

2019 ◽  
Vol 59 (4) ◽  
pp. 553-557
Author(s):  
V. S. Savenko ◽  
A. V. Savenko
Keyword(s):  
Ion Exchange ◽  
Atmospheric Aerosols ◽  
Exchange Capacity ◽  
Salt Composition ◽  
Exchange Transformation ◽  
The Earth ◽  
Adsorbed Complex ◽  
Total Exchange Capacity ◽  
Arid And Semiarid ◽  
Total Exchange

Data on the total exchange capacity and composition of the adsorbed complex of terrigenous aerosols generated in arid and semiarid regions of the earth were summarized. It was calculated that as a result of change in composition of the adsorbed complex of aerosols occurring during their interaction with seawater, 2.64–4.86 million tons/year of dissolved Ca2+ are additionally enters into the ocean and 2.45–4.51, 0.73–1.34, and 0.08–0.14 million tons/year of dissolved Na+, K+, and Mg2+, respectively, are removed.

scholarly journals Amberlite IRC-718 ion chelating resin extraction of hazardous metal Cr (VI) from aqueous solutions: equilibrium and theoretical modeling

2021 ◽  
Author(s):  
Abdelhamid Addala ◽  
Moussa Boudiaf ◽  
Maria Elektorowicz ◽  
Embarek Bentouhami ◽  
Yacine Bengeurba
Keyword(s):  
Ion Exchange ◽  
Aqueous Solutions ◽  
Exchange Process ◽  
Ion Exchange Resin ◽  
Exchange Capacity ◽  
Chelating Resin ◽  
Exchange Potential ◽  
Chromium Vi ◽  
Ion Exchange Process ◽  
Hazardous Metal

Abstract Under varied conditions, the IRC 718 ion-exchange resin is used to extract chromium (VI) ions from aqueous solutions. On chromium (VI) removal effectiveness, the effects of adsorption dosage, contact time, beginning metal concentration, and pH were examined. The batch ion exchange process reached equilibrium after around 90 minutes of interaction. With an initial chromium (VI) concentration of 0.5 mg/dm3, the pH-dependent ion-exchange mechanism revealed maximal removal in the pH 2.0–10 range . The adsorption mechanism occurs between Cr(VI) determined as the electron acceptor, and IRC 718 determined as the electron donor. The equilibrium ion-exchange potential and ion transfer quantities for Amberlite IRC 718 were calculated using the Langmuir adsorption isotherm model. The overall ion exchange capacity of the resin was determined to be 187.72 mg of chromium (VI)/g of resin at an ideal pH of 6.0.

scholarly journals Using of Clay as Heterogeneous Catalysts for Organic Syntheses; A Review

2021 ◽  
pp. 32-36
Author(s):  
Enas A. Almadani ◽  
Farah Haron ◽  
Dala M Ibrahim
Keyword(s):  
Thermal Stability ◽  
Ion Exchange ◽  
Heterogeneous Catalysts ◽  
Low Cost ◽  
Exchange Capacity ◽  
Cyclization Reactions ◽  
Ion Exchange Capacity ◽  
Environmental Friendly ◽  
Oxidation Of Alcohols ◽  
Esterification Reactions

Clay and clay modified catalysts have been widely used to catalyze various types of organic reactions such as esterification reactions, isomerization reactions, cyclization reactions, oxidation of alcohols, dehydrogenation, epoxidation and several more. Due to its favorable properties such as low cost, thermal stability, selectivity, large surface area, ion exchange capacity, easily separated, as well as environmental friendly. This paper reviewed some recent studies on the using of clay and modified clay as catalyst for the production of esters.

scholarly journals Rapid Preparation of Biosorbents with High Ion Exchange Capacity from Rice Straw and Bagasse for Removal of Heavy Metals

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Supitcha Rungrodnimitchai
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Ion Exchange ◽  
Rice Straw ◽  
Heavy Metal Ions ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Exchange Capacity ◽  
Ion Exchange Capacity ◽  
Removal Of Heavy Metals

This work describes the preparation of the cellulose phosphate with high ion exchange capacity from rice straw and bagasse for removal of heavy metals. In this study, rice straw and bagasse were modified by the reaction with phosphoric acid in the presence of urea. The introduced phosphoric group is an ion exchangeable site for heavy metal ions. The reaction by microwave heating yielded modified rice straw and modified bagasse with greater ion exchange capacities (∼3.62 meq/g) and shorter reaction time (1.5–5.0 min) than the phosphorylation by oil bath heating. Adsorption experiments towards Pb2+, Cd2+, and Cr3+ions of the modified rice straw and the modified bagasse were performed at room temperature (heavy metal concentration 40 ppm, adsorbent 2.0 g/L). The kinetics of adsorption agreed with the pseudo-second-order model. It was shown that the modified rice straw and the modified bagasse could adsorb heavy metal ions faster than the commercial ion exchange resin (Dowax). As a result of Pb2+sorption test, the modified rice straw (RH-NaOH 450W) removed Pb2+much faster in the initial step and reached 92% removal after 20 min, while Dowax (commercial ion exchange resin) took 90 min for the same removal efficiency.

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