Carbonization of Coffee Grounds Surface by Microwave and Adsorption Behavior of Nitrite Nitrogen

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  • マイクロ波照射によるコーヒー豆かす表面の炭化と亜硝酸性窒素の吸着挙動
  • マイクロハ ショウシャ ニ ヨル コーヒーマメカス ヒョウメン ノ タンカ ト アショウサンセイ チッソ ノ キュウチャク キョドウ

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Abstract

Recently, some harmful compounds and bacteria have been detected from tap water. Particularly, the nitrite nitrogen causes methemoglobinemia and cyanosis for infants. In this study, the surfaces of coffee grounds were carbonized by microwave and carbonaceous materials were produced. The specific surface area of the coffee grounds did not change by carbonization, while the base consumption decreased. Moreover, we estimated the extent of the adsorption of nitrite nitrogen onto the coffee grounds in terms of its removal from tap water. The adsorption mechanism of nitrite nitrogen onto coffee grounds would be monolayer adsorption, because the adsorption isotherms fitted to Freundlich or Langmuir equations. It is suggested that the adsorption of nitrite nitrogen onto coffee grounds is related to the phenolic hydroxyl and carboxyl groups. The coffee grounds thus can be utilized for the removal nitrite nitrogen from tap water.

Journal

  • Hyomen Kagaku

    Hyomen Kagaku 25 (7), 382-386, 2004

    The Surface Science Society of Japan

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