EFFECT OF CHEMICAL MODIFICATION OF HYDROXYAPATITE/ZEOLITE COMPOSITE ON MALODORS ADSORPTION BEHAVIOR

  • NISHIDA Hiroshi
    Graduate School of Science and Engineering, Yamagata University
  • KANNO Ikumi
    Graduate School of Science and Engineering, Yamagata University
  • KIMATA Mitsumasa
    Graduate School of Science and Engineering, Yamagata University
  • OGATA Tateaki
    Graduate School of Science and Engineering, Yamagata University
  • KAWAI Takahiro
    Graduate School of Science and Engineering, Yamagata University

Abstract

Hydroxyapatite (HAp)/zeolite composite (HZc) was prepared by a simple immersion method, and it was then modified with Cu2+ and 3-aminoplopyltriethoxysilane (APES) to produce a novel adsorbent for unpleasant odors such as NH3, H2S and CH3CHO gases. The obtained materials were characterized by SEM-EDS, XRD, FT-IR, TG-DTA and ninhydrin reaction test. Nano-sized order HAp was observed distributed on zeolite for HZc, and modification of HZc with Cu2+ and APES maintained the original framework structure of HZc. Introduced amount of Cu2+ and APES after the modification was 3.6 mol% and 12.6 mg·g-1, respectively. The adsorption ability evaluated via a gas bag-detection tube method showed that Cu2+-modified HZc increased NH3 and H2S adsorption ability, and APES-modified HZc enhanced CH3CHO adsorption ability in comparison to unmodified one, respectively. Sequential modification of HZc with Cu2+ and APES also maintained H2S and NH3 adsorption ability, but decreased CH3CHO adsorption ability. This suggests that adsorption sites for CH3CHO were impeded in case of formation of Cu-N coordinate bond derived from direct interaction between Cu2+ and amino groups of APES. Therefore, use of HZc individually modified with Cu2+ and APES is recommended to capture multiple unpleasant odors.

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