A Study of Lead Sorption by a Cellulose-Based Chelating Ion Exchanger Ostsorb Dtta

1994 ◽  
Vol 59 (1) ◽  
pp. 106-118 ◽  
Author(s):  
Ladislav Svoboda ◽  
Jaroslav Chutný ◽  
Miloslav Tomek
Keyword(s):  
Ion Exchange ◽  
Aqueous Medium ◽  
Mechanical Stability ◽  
High Water ◽  
Exchange Capacity ◽  
Ion Exchanger ◽  
High Water Content ◽  
Experimental Conditions ◽  
Complexing Properties ◽  
Kinetics Of

Complexing properties of the chelating ion exchanger based on spherical cellulose modified by the functional groups of diethylenetriaminetetraacetic acid, Ostsorb DTTA, have been studied in the sorption of lead from aqueous medium at various experimental conditions, such as pH, the dynamic or static arrangement of experiment, the presence of other compounds, the concentration of the ion being sorbed, the form of ion exchanger etc. The results have been compared with the data found with the known selective ion exchanger Dowex A-1. Ostsorb DTTA exhibits good kinetics of the ion exchange at the exchange capacity of 210 mg Pb g-1 for pH 6. For some applications, its lower mechanical stability and high water content in the swollen particles may be unfavourable.

Preparation of Cation Exchanger Using Electrospun Polystyrene Nanofiber

2006 ◽  
Vol 10 (2) ◽  
pp. 196-200 ◽  
Author(s):  
Hyung-Hwan An ◽  
◽  
Changyun Shin ◽  
Keyword(s):  
Ion Exchange ◽  
Glass Fiber ◽  
Water Uptake ◽  
Cation Exchanger ◽  
Fiber Surface ◽  
High Water ◽  
Exchange Capacity ◽  
Experimental Results ◽  
Ion Exchanger ◽  
Ion Exchange Capacity

We studied a new ion exchanger for high ion exchange capacity (IEC) and rapid ion exchange. Polystyrene nanofiber ion exchangers (PSNIEs) were prepared by electrospinning from solutions of dissolved polystyrene followed by sulfonation. Coating and sulfonation were used to modify the glass fiber surface with polystyrene to produce cation exchanger fiber (CEF). We present new experimental results on the performance of PSNIE and CEF related to parameters of IEC, water uptake, and surface morpoholgy. IEC and water uptake of PSNIE depend on sulfonation time. IEC reached 3.74 mmol/g at relatively high water uptake of 0.6 to 0.77g H2O/g-dry-PNIE. IEC and water uptake of CEF reached 3.61mmol/g-CEF and 0.25g H2O/g-dry-CEF.

scholarly journals Microbial-Induced Carbonate Precipitation for Strengthening Soft Clay

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
J. Z. Xiao ◽  
Y. Q. Wei ◽  
H. Cai ◽  
Z. W. Wang ◽  
T. Yang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Water Content ◽  
Unconfined Compressive Strength ◽  
Soft Clay ◽  
High Water ◽  
High Water Content ◽  
Carbonate Precipitation ◽  
Experimental Conditions ◽  
Strength Enhancement ◽  
Complex Chemical Composition

Currently, calcite produced in sediments by microbial-induced carbonate precipitation (MICP) is mainly used as a strengthening binder in sand because sands are porous and have good permeability. Conventional wisdom does not consider MICP to be suitable for use in soft clay because of the clay particles’ small size and its minimal porosity. Because of the clay’s high water content and complex chemical composition, very little research has been done and not much is known about the use of MICP in soft clay for strength enhancement. For this paper, soft clay specimens were prepared by mixing a solution containing Sporosarcina pasteurii bacteria, solutions with different concentrations of nutrient salts, and soft clay. Unconfined compressive strength tests were carried out on these specimens after they had cured for 28 days in a moisture-controlled environment. These laboratory tests were used to study the chemical reactions, the clay’s strength, and other influencing factors. The results are as follows: (1) directly mixing a S. pasteurii solution, nutrient salts, and soft clay considerably improves the uniformity of the spatial distribution of the bacteria and the nutrients in the soft clay. Directly mixing these constituents promotes the formation of calcium carbonate and greatly simplifies soft clay sample preparation. (2) It is feasible to use MICP to increase the strength of soft clay. Compared to control specimens cured under the same conditions but without introduced nutrients and bacteria solution, the unconfined compressive strength of MICP-treated specimens can be increased by as much as 2.42 times to an unconfined compressive strength of 43.31 kPa. The water content in MICP-treated specimens was significantly reduced by the MICP reactions and in one case decreased from 40% to 30.73%. (3) The strength enhancement of microbially solidified soft clay is the result of two processes: urea hydration catalyzed by enzymes consumes water in the clay and the bacterially precipitated calcite forms in the sediment’s pores. (4) The micro-organism-produced calcite in the soft clay increases the calcite abundance from 0% to as much as 3.5%. (5) The MICP-treated strength of soft clay varies with the concentration of the nutrients provided. For the experimental conditions used for this paper, the optimum concentration of the CaCl2·2H2O and CH4N2O nutrients is 0.5 mol/L.

The Synthesis and Ion-Exchange Property of Li0.5Mn1.375O3

2013 ◽  
Vol 842 ◽  
pp. 259-262
Author(s):  
Jin He Jiang ◽  
Wei Yu Dai
Keyword(s):  
Solid State ◽  
Ion Exchange ◽  
Solid State Reaction ◽  
Exchange Capacity ◽  
Ion Exchanger ◽  
Exchange Property ◽  
Spinel Type ◽  
Inorganic Ion Exchanger ◽  
Inorganic Ion ◽  
Crystallization Method

Compound [Li0.5Mn1.375O3] was a spinel-type metal compound and was prepared by a solid state reaction crystallization method. The results showed that the Li+ extraction/insertion be progressed mainly by an ion-exchange mechanism. The characterization results showed that the exchange capacity of Li+ was 2.8mmol/g for Li+. Li0.5Mn1.375O3 is an ion-memory inorganic ion exchanger of Li+. It had a memorial ion-sieve property for Li+.

scholarly journals CHARACTERIZATION OF SULFONATED POLYSULFONE/BENTONITE HYBRID MEMBRANES

2014 ◽  
Vol 13 (1) ◽  
pp. 7
Author(s):  
Bambang Piluharto ◽  
Imam Syafi’i ◽  
R. Indahsari ◽  
Tanti Haryati
Keyword(s):  
Ion Exchange ◽  
Water Uptake ◽  
Mechanical Stability ◽  
Group Analysis ◽  
Exchange Capacity ◽  
Polysulfone Membrane ◽  
Ion Exchange Capacity ◽  
Fuel Cell Application ◽  
Sulfonated Polysulfone ◽  
Functional Group Analysis

Sulfonated polysulfone membrane is one of the alternative membranes as replacing Nafion membrane for the fuel cell application. This membrane was prepared by introducing sulfonic group in the polysulfone structure backbone, so that provides the ionic membrane. However, more ionic groups in the SPSF membrane lead to loss mechanical stability. This study aims to prepare the hybrid membrane from SPSF and bentonite. In here, various of bentonite concentrations were used as variable to study water uptake and ion-exchange capacity properties. As the results, increasing bentonite concentrations lead to increase water uptake and ion-exchange capacity. By the functional group analysis, proved that adding bentonite in SPSF did not change structure of SPSF, means that interaction between SPSF and bentonite were physical interactions.

Synthesis and characterization of a new crystalline tin(IV) arsenophosphate ion exchanger

1990 ◽  
Vol 68 (2) ◽  
pp. 346-349 ◽  
Author(s):  
K. V. Surendra Nath ◽  
S. N. Tandon
Keyword(s):  
Ion Exchange ◽  
Cation Exchanger ◽  
Exchange Capacity ◽  
Ion Exchanger ◽  
Amorphous Precursor ◽  
X Ray ◽  
Inorganic Ion Exchanger ◽  
Inorganic Ion ◽  
Exchange Behaviour

A new crystalline layered inorganic ion exchanger tin(IV) arsenophosphate with the formula Sn(HAsO4)(HPO4)•H2O has been prepared by refluxing the amorphous precursor. This exchanger has been characterized by X-ray powder pattern, chemical analysis, IR spectra, and thermal dehydration. Its ion exchange behaviour towards sodium ions is reported. The exchanger has an exchange capacity of 5.36 mequiv./g for Na+. The performance of tin(IV) arsenophosphate is compared with crystalline tin(IV) phosphate and arsenate. Keywords: cation exchanger, crystalline tin(IV) arsenophosphate, ion exchange, thermal behaviour, X-ray studies.

Study of the Inorganic Ion Exchanger Li3Mn0.25Ti0.5O3

2012 ◽  
Vol 178-181 ◽  
pp. 471-474
Author(s):  
Jin He Jiang
Keyword(s):  
Ion Exchange ◽  
Spinel Structure ◽  
Exchange Capacity ◽  
Ion Exchanger ◽  
Inverse Spinel ◽  
Ion Exchange Capacity ◽  
Inorganic Ion Exchanger ◽  
Inverse Spinel Structure ◽  
Inorganic Ion ◽  
Crystallization Method

Inorganic ion exchanger (Li3Mn0.25Ti0.5O3) with an inverse spinel structure was synthesized by solid state reaction crystallization method. 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 9.2mmol/g for Li+.

scholarly journals Modified Phillipsite as a Novel Ion-Exchanger for Potassium Extraction from Seawater

2019 ◽  
Vol 25 (4) ◽  
pp. 441-445
Author(s):  
Chunxia MENG ◽  
Jin HOU
Keyword(s):  
Hydrothermal Synthesis ◽  
Ion Exchange ◽  
Average Particle Size ◽  
Selectivity Coefficient ◽  
Exchange Capacity ◽  
Ion Exchanger ◽  
Average Particle ◽  
Mixed Solution ◽  
Ion Exchange Capacity ◽  
X Ray

Template-free preparation of phillipsite as a novel K+ ion-exchanger was studied systematically by hydrothermal synthesis. The alkalinity, dosage of water glass, dosage of H2O, aging time, reaction temperature and time of hydrothermal synthesis were discussed in detail. The optimized material obtained about phillipsite through the synthesis and testing methods was performed. The K+ ion-exchange capacity and selectivity coefficient were tested. The molar composition for preparing high performance phillipsite obtained was 2K2O:18SiO2:Al2O3:510H2O by optimizing synthetic conditions. The K+ ion-exchange capacity of phillipsite was 57.3 mg/g in seawater. The K+ selectivity coefficient was 88.6 in an equimolar K+ and Na+ mixed solution. Phillipsite can selectively capture K+ over other ions, and therefore can be used for potassium extraction selectively from seawater. Phillipsite was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The XRD pattern indicated that the synthetic zeolite was phillipsite. The phillipsite particles exhibited cross-like shape and the average particle size was about 2.5 μm. The synthetic phillipsite was mainly consisted of Si, Al, K and O elements.

Synthesis of Li+ Memorized Spinel Li3Mn0.75O3 by a Solid State Reaction Crystallization Method

2012 ◽  
Vol 178-181 ◽  
pp. 475-478
Author(s):  
Jin He Jiang
Keyword(s):  
Solid State ◽  
Ion Exchange ◽  
Solid State Reaction ◽  
Exchange Capacity ◽  
Ion Exchanger ◽  
Exchange Mechanism ◽  
Spinel Type ◽  
Ion Exchange Capacity ◽  
Crystallization Method

The ion-exchanger Li3Mn0.75O3 of spinel type was prepared by a solid state reaction crystallization method. 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 8.3mmol/g for Li+.

Novel chromogenic selective sensors for aqueous cyanide ions under high water content and real sample analysis

2016 ◽  
Vol 8 (7) ◽  
pp. 1705-1710 ◽  
Author(s):  
Gopal Balamurugan ◽  
Sivan Velmathi
Keyword(s):  
Water Content ◽  
Aqueous Medium ◽  
High Water ◽  
Real Sample ◽  
High Water Content ◽  
Sample Analysis ◽  
Real Sample Analysis

Novel chromogenic receptors (R1–R2) containing anthraquinone as the signalling unit and imidazole as the binding unit were designed to enhance the sensing action in an aqueous medium.

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.

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