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.

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.

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.

DETERMINATION OF CHROMIUM(VI) IN WATER BY PIXE ANALYSIS USING ION EXCHANGE PAPER — LIMIT OF DETECTION AND INTERFERENCE BY COEXISTING ANIONS

2009 ◽  
Vol 19 (01n02) ◽  
pp. 1-8 ◽  
Author(s):  
SUREERAT THOMYASIRIGUL ◽  
HITOSHI FUKUDA ◽  
JUN HASEGAWA ◽  
YOSHIYUKI OGURI
Keyword(s):  
Ion Exchange ◽  
Proton Energy ◽  
Limit Of Detection ◽  
Deae Cellulose ◽  
Exchange Capacity ◽  
Ion Exchange Capacity ◽  
Pixe Analysis ◽  
X Ray ◽  
Chromium Vi

Concerning the PIXE analysis of Cr ( VI ) in water using ion-exchange filters, the limit of detection (LOD) and the influence of matrix anions were investigated. In order to look for the experimental condition for obtaining the minimum LOD, we measured the Cr - K α X-ray counts and background counts under the K α X-ray peak as a function of the incident proton energy and the thickness of the Mylar absorber foil in front of the detector. To investigate the interference by coexisting anions, each of PO 43-, SO 42-, NO 3-, Cl -, and F - ions and Cr ( VI ) ions were mixed in aqueous solutions and adsorbed on DE81-DEAE cellulose paper, a weakly basic anion exchanger with diethylaminoethyl functional groups. Then the filter samples were measured by PIXE using 2.5 MeV proton beams. We obtained a LOD of 0.16 µg or 8 ppb for 20 mL samples at a proton energy of 2.5 MeV and a Mylar film thickness of 50 or 100 µm. The experimental results on the mixed solutions indicated that NO 3-, Cl -, and F - as coexisting ions didn't interfere significantly with determination of a 50 µ g / L Cr ( VI ) concentration for 40 mL total solution volume, despite the total amount of anions was about 90% of ion exchange capacity of a filter. On the other hand, slight interferences by PO 43- ions were observed. However, under the same condition, we found that if the total amount of SO 42- ions was higher than 20% of ion exchange capacity, they induced significant interferences in determining Cr ( VI ).

scholarly journals Investigate the adsorption of cesium ion (Cs+) on Zn2[Fe(CN)6] AND Zn3[Fe(CN)6]2 nanoparticles

2020 ◽  
Vol 3 (4) ◽  
pp. 307-316
Author(s):  
Nguyen Dinh Trung ◽  
Le Thi Ha Lan ◽  
Truong Dong Phuong
Keyword(s):  
Ion Exchange ◽  
Adsorption Capacity ◽  
Exchange Capacity ◽  
Ion Concentration ◽  
Experimental Conditions ◽  
Ion Exchange Capacity ◽  
Freundlich Isotherms ◽  
Ion Absorption ◽  
Adsorption Data ◽  
Ph Range

Adsorption of Cs+ ion from aqueous solution by Zn2[Fe(CN)6] and Zn3[Fe(CN)6]2 nanoparticle, and the effect of experimental conditions on the adsorption were investigated. Preliminary results showed that two materials were very efficient as an absorbent. Zn2[Fe(CN)6] and Zn3[Fe(CN)6]2 nanoparticle adsorbents for removal Cs+ion from solution have been successfully synthesized. Comparison between two materials, the Cs + ion adsorption capacity of Zn2[Fe(CN)6] was higher than Zn3[Fe(CN)6]2 and the reaction time was shorter. The adsorption equilibrium time of Zn3[Fe(CN)6]2 was about 20 hours, and the suitable pH range 3-7 while the Zn2[Fe(CN)6] was 15 minutes. The Cs+ ion absorption by Zn2[Fe(CN)6] nanoparticle follow the ion exchange mechanism, the best exchange capacities of the material were in the pH 3-5 range, ion exchange capacity depended on the pH, the maximum ion exchange capacity of the material at pH = 4 was 1.01 meq (Cs+) / g. After 15 min, about 98% of initial Cs+ ion concentration was removed from the solution; the adsorption data did not accord with Langmuir and Freundlich isotherms. The high adsorption capacity and good performance on other aspects, make the Zn2[Fe(CN)6] nanoparticle a promising adsorbent for the removal of Cs+ ion from water.

Equilibrium Sorptions in Heterogeneous Ion Exchange Membranes

1992 ◽  
Vol 57 (9) ◽  
pp. 1905-1914
Author(s):  
Miroslav Bleha ◽  
Věra Šumberová
Keyword(s):  
Experimental Data ◽  
Ion Exchange ◽  
Total Content ◽  
Distribution Coefficients ◽  
Exchange Capacity ◽  
Ion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Equilibrium Sorption ◽  
Inhomogeneity Factor

The equilibrium sorption of uni-univalent electrolytes (NaCl, KCl) in heterogeneous cation exchange membranes with various contents of the ion exchange component and in ion exchange membranes Ralex was investigated. Using experimental data which express the concentration dependence of equilibrium sorption, validity of the Donnan relation for the systems under investigation was tested and values of the Glueckauf inhomogeneity factor for Ralex membranes were determined. Determination of the equilibrium sorption allows the effect of the total content of internal water and of the ion-exchange capacity on the distribution coefficients of the electrolyte to be determined.

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.

The Synthesis and Ion-Exchange Property of Inorganic Material Mg1.5Mn0.5Ti0.75O4

2012 ◽  
Vol 511 ◽  
pp. 105-108
Author(s):  
Jin He Jiang
Keyword(s):  
Ion Exchange ◽  
Inorganic Material ◽  
Exchange Capacity ◽  
Exchange Property ◽  
Insertion Reaction ◽  
Ion Exchange Capacity ◽  
X Ray ◽  
Thermal Crystallization ◽  
Crystallization Method ◽  
Saturation Capacity

Mg1.5Mn0.5Ti0.75O4 was prepared by a coprecipitation/thermal crystallization method. The extraction/insertion reaction with this material was investigation by X-ray, saturation capacity of exchange, and Kd measurement. The acid treatments of Mg1.5Mn0.5Ti0.75O4 caused Mg2+ extractions of more than 72%, while the dissolutions of Mn4+ and Ti4+ were less than 8.2%. The results showed that the Li+ extraction/insertion be progressed mainly by an ion-exchange mechanism. The acid treated samples had an ion exchange capacity of 10.6mmol/g for Li+.

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