Papers by Keyword: Ion Exchanger

Abstract: Synthesis and characterization of a new hybrid ion exchange material Zirconiumresorcinol Phosphate (ZrRP) is reported in this study. Synthetic conditions such as reactant concentrations and mixing volume ratio were varied to optimize the ion exchange properties of this material. The material has Na⁺ ion exchange capacity equal to 1.7 meq/g (dry). X-ray diffraction spectra suggest that it is amorphous in nature. This ion-exchanger was also characterization by SEM, IR and TGA-DTG. Various studies such as determination of ion exchange capacity, elution behaviour and pH titration has been performed for different metal ions such as K⁺, Ca²⁺, Sr²⁺, Mg²⁺, Ni²⁺, Cd²⁺. This material has potential application for removal of these ions from the aqueous systems. Effect of anionic (SDS) and nonionic (TX-100) surfactants has also been studied on the adsorption behavior of ZrRP. The material has been found to be selective for Mg²⁺and Cd²⁺. We also found that the material showed remarkable adsorption behavior towards some dyes like malachite green and methylene blue.

Abstract: The powder of Li_1.4Al_0.4Ti_1.6 (PO₄) ₃ has been synthesized by a solid phase reaction between Li₂CO₃, Al₂O₃, TiO₂ and NH₄H₂PO₄. Sodium removal was studied in an extensive series of tests involving different ionic exchange process variables such as time and temperature. The results indicate that the Na/Li ion exchange reaction rate increased obviously with increasing temperature, and the Na/Li ion exchange kinetics process of Li_1.4Al_0.4Ti_1.6 (PO₄) ₃ in lithium chloride solution could be shown approximately by the equation of JMAK. Furthermore, it is concluded that the Na⁺-removed materials obtained from NASICON-type ceramics synthesized can serve as selective Na⁺ absorbent due to its high selectivity and larger ion exchange capacity.

Abstract: Gum tragancanth based organic-inorganic hybrid ion exchanger has been synthesized using a mixture of sodium tungstate, orthophosphoric acid and potassium iodate. The different reaction conditions like reaction temperature, reaction time, pH of reaction medium, solvent volume, monomer concentration and initiator concentration were optimized in order to get the semi-IPN Gt-cl-poly (AA). Onto semi IPN, methylmethacrylate was incorporated using lipase-gluteraldehyde as the initiator-crosslinker system. The IPN finally was converted into ion-exchanger and was studied for its different physico-chemical properties. Ion exchange capacity was studied for Na⁺ and effect of different temperatures on ion exchange capacity was evaluated. Characterization was done using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and EDS techniques.

Abstract: New complex inorganic ion exchanger Mg_2.5Ti(PO₄)₃ is synthesized. Chemical composition, structure and some related properties and complex mechanism of this ion exchanger are investigated by electron microscopic, X-ray diffraction and chemical methods. Results of column test indicated, that the exchange capacity obtained from tests for Li⁺ in 0.1mol /L HNO₃ solution is 9.0mmol/g.

Abstract: In this study, polystyrene nanofiber ion exchangers (PSNIE) were successfully prepared by a new method comprising of electrospinning and the subsequent crosslinking with formaldehyde and sulfonation in sulfuric acid to create the cation exchange functionality on the fibers surfaces. The PS solution at 15% w/v in dimethylacetamide (DMAc) produced the smallest PS nanofibers (399±38 nm) with good performance. The degree of crosslink and ion exchange capacity (IEC) of PSNIE depended upon the crosslinking time. The longer crosslinking time caused the greater crosslinked PS fibers. At the longest crosslinking time of 75 min, the remaining crosslinked PS fibers in dichloromethane were 94.12%; whereas, the starting fibers completely dissolved. This crosslinking agent (e.g. formaldehyde) might introduce methylene bridges in addition to sulfone bridges into the fibers. However, IEC decreased as crosslinking time increased, probably due to the difficulty of sulfonic functional groups to react with crosslinked PS fibers. The PSNIE crosslinked for 10 min showed the maximum IEC of 2.86 meq/g-dry-PSNIE, and the diameter of the PSNIE after sulfonation increased to 450-460 nm. Since cationic drug could be loaded onto this novel PSNIE, this nanofiber ion exchanger may be applied for controlled release delivery.

Abstract: New complex inorganic ion exchanger Al1.25Fe0.75(PO4)2 is synthesized. Chemical composition, structure and some related properties and complex mechanism of this ion exchanger are investigated by electron microscopic, X-ray diffraction and chemical methods. The ion exchange behavior of Al1.25Fe0.75(PO4)2 has been studied in detail. Results of column test indicated, that the exchange capacity obtained from tests for Li+ in 0.1mol /L HNO3 solution is 7.0mmol/g.

Abstract: New complex inorganic ion exchanger AlTi(PO4)2.3333 is synthesized. Chemical composition, structure and some related properties and complex mechanism of this ion exchanger are investigated by electron microscopic, X-ray diffraction and chemical methods. The ion exchange behavior of AlTi(PO4)2.3333 has been studied in detail. Results of column test indicated, that the exchange capacity obtained from tests for Li+ in 0.1mol /L HNO3 solution is 4.9mmol/g.

Abstract: New complex inorganic ion exchanger Al2Ti(PO₄)_3.3333 was synthesized by a solid state reaction crystallization method. using Al₂O₃, TiO₂ and NH₄H₂PO₄ as raw materials. The optimum conditions were obtained by thermal experiment, calcination temperature was at 770°C, calcination time was 4.5h. The ion exchange behavior of Al2Ti(PO₄)_3.3333 has been studied in detail. Results of column test indicated, that the exchange capacity obtained from tests for Li+ in 0.1mol /L HNO3 solution is 7.1mmol/g..

Abstract: New complex inorganic ion exchanger AlFe(PO₄)₂ is synthesized. Chemical composition, structure and some related properties and complex mechanism of this ion exchanger are investigated by electron microscopic, X-ray diffraction and chemical methods. The ion exchange behavior of AlFe(PO₄)₂ has been studied in detail. Results of column test indicated, that the exchange capacity obtained from tests for Li⁺ in 0.1mol /L HNO₃ solution is 5.5mmol/g.

Abstract: New complex inorganic ion exchanger Li₂TiO₃ was synthesized. The ion exchange behavior of Li₂TiO₃ has been studied in detail. Results of column test indicated, that the exchange capacity obtained from tests for Li⁺ in 0.1mol /L HNO₃ solution is 10.1mmol/g.