J. Technology and Education, Vol.31, No.2, pp.19-22 (2024)

研究論文

オカラ粉末によるアルラレッド色素の吸着除去

水谷 涼花¹，下古谷 博司^2*

¹鈴鹿工業高等専門学校・総合イノベーション工学専攻（〒510-0294　三重県鈴鹿市白子町官有地）

²鈴鹿工業高等専門学校・材料工学科（〒510-0294　三重県鈴鹿市白子町官有地）

*E-mail: hshimo@mse.suzuka-ct.ac.jp

 

The removal of Allura Red dye by adsorption onto okara

Ryoka MIZUTANI and Hiroshi SHIMOFURUYA

¹Advanced Engineering Course of Science and Technology for Innovation, National Institute of Technology, Suzuka College.

²Department of Materials Science and Engineering, National Institute of Technology, Suzuka College.

Shiroko-cho, Suzuka-shi, Mie 5100294, Japan.

 

(Received August 5, 2024; Accepted September 12, 2024)

 

Abstract

The purpose of this study was to remove Allura Red dye from an aqueous solution by adsorption onto okara. The effects of pH, adsorbent dosage and agitation time were studied in batch experiments.  As a result, the maximum adsorption of Allura Red dye was obtained at pH 2. Moreover, the adsorption of Allura Red dye increased with increasing adsorbent dosage and constant adsorption was observed at dosages of 0.2g and higher. Furthermore, the adsorption of Allura Red dye occurred rapidly in the early period, and 78% of Allura Red dye was adsorbed in the first 10 mins of agitation time. Additionally, Langmuir adsorption and Freundlich adsorption isotherms were also investigated. From the Langmuir adsorption isotherm, it was found that the saturated adsorption capacity of okara was 38.5 mg/g. On the other hand, the Freundlich adsorption isotherm showed that the amount of Allura Red dye adsorbed was only slightly dependent on the concentration of its solution. These results suggested that okara was an effective adsorbent that could be used for the removal of Allura Red dye.

Keywords: Okara, Adsorption, Allura Red