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.

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 Removal of Cu(II) from Aqueous Solution Using a Micaceous Mineral of Kenyan Origin

2003 ◽  
Vol 21 (3) ◽  
pp. 269-283 ◽  
Author(s):  
Stephen Attahiru ◽  
Paul M. Shiundu ◽  
John M. Onyari ◽  
Eliud M. Mathu
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Ion Concentration ◽  
Chemical Pretreatment ◽  
Dose Ratio ◽  
Freundlich Isotherms ◽  
Micaceous Mineral ◽  
Adsorption Data ◽  
Ph Range ◽  
Maximum Removal

A micaceous mineral (MicaM) available locally in Kenya was utilized as an inexpensive and effective adsorbent for the removal of Cu2+ ions from aqueous solution. The effects of contact time, pH, temperature, adsorbate and adsorbent concentrations, and the concentration of electrolyte on the removal of Cu2+ ions were studied. Maximum removal of Cu2+ ions occurred over the pH range 4.0–7.0. The adsorption of Cu2+ ions increased with an increase in the dose ratio of mineral to Cu2+ ion concentration and decreased with adsorbent particle size. Isotherm analysis of the adsorption data obtained at 25°C showed that the adsorption of Cu2+ ions on MicaM followed both the Langmuir and Freundlich isotherms. The uptake of Cu2+ ions increased on increasing the pH of the solution from 1.5 to 7.0 as well as on increasing the temperature from 25°C to 60°C. An adsorption capacity of 0.850 g/g was achieved for MicaM towards the Cu2+ ion. This study has demonstrated that locally abundant micaceous mineral can be used as an effective adsorbent for the treatment of waters containing Cu2+ ions without any prior chemical pretreatment.

scholarly journals Investigating the adsorption of cesiun ion (Cs+) on cobalt hexacyanoferrate coated magnetite nanoparticles

2020 ◽  
Vol 2 (6) ◽  
pp. 192-200
Author(s):  
Nguyen Dinh Trung ◽  
Le Thi Ha Lan ◽  
Nguyen Thi My Ngoc ◽  
Nguyen An Son
Keyword(s):  
Ion Exchange ◽  
Exchange Capacity ◽  
Precipitation Method ◽  
Fe3o4 Nanoparticle ◽  
High Adsorption ◽  
Ion Exchange Capacity ◽  
Freundlich Isotherms ◽  
Cobalt Hexacyanoferrate ◽  
High Adsorption Capacity ◽  
Co Precipitation

Co2[Fe(CN)6]/Fe3O4 nanoparticle adsorbent for ion cesium (Cs+) sorption was prepared by a chemical co-precipitation method. The magnetization of the materials makes them to be separated easyly from an aqueous solution by an external magnetic field. The ion Cs+ absorption by Co2[Fe(CN)6]/Fe3O4 nanoparticle follow the ion exchange mechanism, ion exchange capacity depends on the pH, the maximum ion exchange capacity of the material at pH = 4 is 0.40 meq (Cs+)/ g. After 15 min, about 98% of initial ion Cs+ concentration was removed from the solution, the adsorption could be described by Langmuir and Freundlich isotherms. The high adsorption capacity and good performance on other aspects, make the Co2[Fe(CN)6]/Fe3O4 nanoparticle a promissing adsorbent for the removal of ion Cs+ from water.

scholarly journals RESEARCH ON ION EXCHANGE CAPACITY OF OXIDIZEDACTIVATED CARBON

2018 ◽  
Vol 55 (4C) ◽  
pp. 245
Author(s):  
Pham Thi Hai Thinh
Keyword(s):  
Activated Carbon ◽  
Ion Exchange ◽  
Surface Treatment ◽  
Adsorption Capacity ◽  
Inorganic Compounds ◽  
Exchange Capacity ◽  
Carbon Surface ◽  
Maximum Adsorption Capacity ◽  
Ion Exchange Capacity ◽  
Naoh Solution

Ion exchange capacity of oxidized activated carbon (OAC) by HNO3 and surface treatment by NaOH solution was investigated. The HNO3oxidizedfunctional groups on the activated carbon surface, such as ketone, carboxylic acid and its derivatives, to maximum oxidation state. The OAC surface played the role as cation exchanger for adsorption of inorganic compounds, especially metallic cations. The adsorption capacity of OAC was investigated in batch mode with three representative ions with different valence from +1 to +3 (NH4+, Ca2+, Cr3+). The adsorption process was demonstrated by Langmuir and Freundlich isothermal model, and the maximum adsorption capacity according to Langmuir isothrermal equation was 20.4 mg/g for NH4+, 43.5 mg/g for Ca2+ and 38.5 mg/g for Cr3+. The results showed the OAC modified by HNO3 and surface treatment by NaOH solution improved adsorption capacity of AC for cations in solution to a higher level. 

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.

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+.

scholarly journals Polymer Electrolyte Membranes Based on Nafion and a Superacidic Inorganic Additive for Fuel Cell Applications

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 914 ◽  
Author(s):  
Lucia Mazzapioda ◽  
Stefania Panero ◽  
Maria Assunta Navarra
Keyword(s):  
Fuel Cell ◽  
Ion Exchange ◽  
Proton Exchange Membrane ◽  
Sol Gel ◽  
Composite Membranes ◽  
Exchange Capacity ◽  
Proton Exchange ◽  
Thermal Transitions ◽  
Ion Exchange Capacity ◽  
Electrolyte Membranes

Nafion composite membranes, containing different amounts of mesoporous sulfated titanium oxide (TiO2-SO4) were prepared by solvent-casting and tested in proton exchange membrane fuel cells (PEMFCs), operating at very low humidification levels. The TiO2-SO4 additive was originally synthesized by a sol-gel method and characterized through x-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and ion exchange capacity (IEC). Peculiar properties of the composite membranes, such as the thermal transitions and ion exchange capacity, were investigated and here discussed. When used as an electrolyte in the fuel cell, the composite membrane guaranteed an improvement with respect to bare Nafion systems at 30% relative humidity and 110 °C, exhibiting higher power and current densities.

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