Journal of Ion Exchange
Online ISSN : 1884-3360
Print ISSN : 0915-860X
ISSN-L : 0915-860X
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Volume 21, Issue 4
Displaying 1-7 of 7 articles from this issue
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  • Separation of Tetramethyl Ammonium Hydroxide in Waste Water with Ion Exchange Using Activated Carbon Prepared by Bamboo
    Ayako YAMAGUCHI, Syouhei NISHIHAMA, Kazuharu YOSHIZUKA
    2010 Volume 21 Issue 4 Pages 375-381
    Published: 2010
    Released on J-STAGE: April 18, 2012
    DOIhttps://doi.org/10.5182/jaie.21.375
    JOURNAL FREE ACCESS
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    Activated carbon is prepared by bamboo for the selective recovery of tetramethyl ammonium hydroxide (TMAH), contained in waste water from semiconductive industry, at the end of pipe of the plant. The adsorption ability of the activated carbon from bamboo (BAC) is comparable to the commercial activated carbons. The adsorption of TMAH with BAC in batchwise system increases with increase in pH value of the aqueous solution, and the effective adsorption and elution yield is also obtained in column system. Quantitative adsorption–elution processing can be achieved with the present BAC, and thus indicating the BAC is effective material as the adsorbent of TMAH at the end of pipe of the plant.
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  • Preparation and Cation Exchange Properties of Zeolitic Adsorbents Using Fused Coal Fly Ash and Seawater
    Takashi HIRAI, Takaaki WAJIMA, Kazuharu YOSHIZUKA
    2010 Volume 21 Issue 4 Pages 382-387
    Published: 2010
    Released on J-STAGE: April 18, 2012
    DOIhttps://doi.org/10.5182/jaie.21.382
    JOURNAL FREE ACCESS
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    For the development of functional material using coal fly ash discharged from thermal power plants, we have prepared zeolitic adsorbents derived from alkaline fused coal fly ash in several aqueous saline media to obtain the optimized preparation condition. The NH4+ exchange capacity of the product prepared at 80°C for 12 hours in diluted seawater using the precursor fused at 500°C was 4.6 mmol⁄g which is equivalent that of product prepared in deionized water. Zeolite-X and zeolite-A were produced in all aqueous media, in addition hydroxysodalite was produced over 12 hours. It was suggested that zeolite-A transform into hydroxysodalite in the products. The zeolitic adsorbents having high ion exchange capacity could be prepared in twice diluted seawater at 6-12 hours in 80°C using a precursor fused at 500°C.
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  • Optimisation of n–Hexyl Acetate Synthesis in a Chromatographic Reactor
    Dipesh PATEL, Basudeb SAHA, Richard WAKEMAN
    2010 Volume 21 Issue 4 Pages 388-391
    Published: 2010
    Released on J-STAGE: April 18, 2012
    DOIhttps://doi.org/10.5182/jaie.21.388
    JOURNAL FREE ACCESS
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    Laboratory scale batch chromatographic reactor experiments were carried for the esterification of acetic acid with n–hexanol to synthesise a value added ester, namely n–hexyl acetate in the presence of an ion exchange resin catalyst, Purolite CT–124. The effect of various parameters such as solvent flow rates in the regeneration step, amount of reactants in the reaction step and reaction step time was studied for optimisation of the reaction condition in a batch chromatographic reactor. This information would be useful for the design, operation and optimisation of n–hexyl acetate synthesis in a continuous chromatographic reactor.
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  • Sorption of Phosphoric Acid by Anion-Exchange Membrane
    Hiroshi TAKAHASHI, Ken-Ichi KIKUCHI
    2010 Volume 21 Issue 4 Pages 392-396
    Published: 2010
    Released on J-STAGE: April 18, 2012
    DOIhttps://doi.org/10.5182/jaie.21.392
    JOURNAL FREE ACCESS
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    Sorption equilibrium of phosphoric acid by strongly basic anion-exchange membrane (SELEMION AMV) was studied to determine the selectivities of ionic species of phosphoric acid. The sorption of phosphoric acid by the membrane increased with increase in the phosphate concentration in the solution and pH. The sorption characteristics were successfully explained by the ion-exchange model considering the dissociation of phosphoric acid in the solution, electro-neutrality in the solution and in the membrane, and material balances of chemical species.
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