Adsorption of Metal Ions and Acid Dyes on Brewer's Refuse and Its Crosslinked Products

Yoshiaki SHIMIZU*, Masahiro KAWAGUCHI†, Yasuko KUBOTA and Toshinobu HIGASHIMURA

Department of Materials Science, School of Engineering, The University of Shiga Prefecture; 2500 Hassaka-cho, Hikone-shi 522-8533 Japan
† Seisui Kogyou Ltd.; 5-2-7 Ebie Fukushima-ku, Osaka-shi 553-0001 Japan

To use brewer's refuse as adsorbent adsorption of metal ions and acid dyes on them and their reaction products with 1,3,5-triacryloylhexahydro-1,3,5- triazine(TAF) were examined. The refuse samples used in the present study are protein rich fraction(Pr) and cellulosics rich fraction (Hr) obtained by sifting brewer's refuse. Adsorptive experiments were conducted by a batchwise method at 303 K.
Pr adsorbed more metal ions such as Cr6+, Ni2+, Co2+, especially Fe3+, Hg2+ and Cu2+ than Hr. But both refuses hardly adsorbed Ca2+. Also Pr adsorbed more acid dyes, especially more hydrophorbic C. I. Acid Red 88 than C. I. Acid Orange7-- than Hr at pH 5. By crosslinking Pr and Hr using TAF adsorption of acid dyes increased markedly, but adsorption of metal ions decreased. Therefore Pr can be used as adsorbent for acid dyes and metal ions as it is. Moreover the crosslinked products are excellent adsorbents for acid dyes.
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