FAゼオライト-セピオライト複合吸着材の合成とその特性

概要

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Synthesis of novel composite adsorbent composed of phillipsite-type zeolite (Na_3Al_3Si_5O_<16>・6H_2O) and sepiolite (Mg_8Si_<12>O_<30>(OH)_4・12H_2O) with high adsorbing abilities for ammonium ion and water, respectively, has been attempted from coal fly ash (FA) i.e. one of the major industrial wastes and sepiolite as natural resources. Although three kinds of zeolites i.e. phillipsite, hydroxysodalite and A-type were formed by hydrothermal treatment of fly ash with NaOH solution, only phillipsite was able to be synthesized selectively by judicious control of all the conditions of reaction temperature, and NaOH concentration and amount. Phillipsite-sepiolite composite was successfully synthesized with similar treatment conditions favorable for phillipsite formation. Thus obtained composite not only retained both the original adsorbing abilities of phillipsite for ammonium ion and sepiolite for water but also had a good molding-ability due to sepiolite. This novel composite adsorbent could be useful for effective usage of industrial wastes and/or natural resources as well as for ammonium ion adsorption under wet environments.
社団法人日本セラミックス協会の論文
2001-02-01