コーヒー殻による水中の銅(II)およびカドミウム(II)の捕集除去

南澤 麿優覽, 中嶋 すぎ子, 友紀 満江, 和江 宮澤, 慶子 上野, 愛 羽鳥, 冴子 宮島, 星野 真希枝, 吉田 章一郎, 信治 高井
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引用次数: 7

Abstract

Adsorption behavior of heavy metals on arabica and robusta roasted coffee beans treated in 5 roasting degrees was investigated. The coffee beans residue after extraction with hot water were suspended in aqueous solutions (pH = ca.6.6) containg Cu(II) or Cd(II) and the amount of heavy metal remaining in the solution was determined on an atomic absorption spectrophotometer. Adsorption ratios of Cu(II) were 60.5 and 79.6% for the light and French roasted coffee beans of Indonesia robusta employed as adsorbent, respectively. However, when the roasted coffee beans were washed with distilled water and then air-dried prior adsorption experiments, the adsorption ratios of Cu were 92.2 and 92.6%, respectively and that of Cd was 95.6 and 97.0%. Thus, the heavy metals were almost removed from aqueous solution by use of the roasted coffee beans with washing and drying treatments.
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咖啡壳捕获水中的铜(II)和镉(II)
研究了5种焙烧温度下阿拉比卡和罗布斯塔咖啡豆对重金属的吸附行为。将热水萃取后的咖啡豆渣悬浮在pH = ca.6.6的含Cu(II)或Cd(II)的水溶液中,用原子吸收分光光度计测定溶液中重金属残留量。以印尼粗煮咖啡豆和法烘咖啡豆为吸附剂,对Cu(II)的吸附率分别为60.5%和79.6%。而焙烧后的咖啡豆经蒸馏水洗涤后风干后进行吸附实验,对Cu的吸附率分别为92.2%和92.6%,对Cd的吸附率分别为95.6%和97.0%。因此,使用经过洗涤和干燥处理的烘焙咖啡豆几乎可以从水溶液中去除重金属。
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