Clay-Cerium Hydroxide Conjugate for the Removal of Dilute Arsenic Dissolving in Water

• Seida Yoshimi

  Nuclear Chemical Engineering Center, Institute of Research and Innovation, Japan

• Masih Dilshad

  Interdisciplinary Graduate School of Science and Technology, Tokyo Institute of Technology, Japan

• Izumi Yasuo

  Interdisciplinary Graduate School of Science and Technology, Tokyo Institute of Technology, Japan

抄録

Insoluble clay-metal hydroxide conjugates with small swelling in water were synthesized. Iron or cerium hydroxides were immobilized electrostatistically in the innerlayer of the Na-montmorillonite with high dispersion. Clay+Mt(OH)_n conjugate (Mt: Fe, Ce) were prepared by intercalating the colloid of metal hydroxide in the innerlayer of the clay. Clay+Mt→OH conjugates were prepared by introducing the metal ions in the clay through ion-exchange followed by hydrolysis of the metal ions in the clay. The intercalation of the metal hydroxides and the chemical state of the metals in the conjugates were evaluated by X-ray diffraction and X-ray absorption fine structure (XAFS) measurements. The conjugates showed mesoporous structure with high specific surface area around 85-150 m²/g. The conjugates adsorbed As^III and As^V from the aqueous solutions of As₂O₃ and KH₂AsO₄. The Langmuir type adsorption isotherms for As^III and As^V with a large value of Langmuir constant, K, were obtained in the Ce-conjugates (Clay+Ce→OH, Clay+Ce(OH)_n), which indicated that the conjugates were effective for the removal of dilute arsenic. The adsorption capacity of the Clay+Ce→OH conjugate was superior to that of the Clay+Ce(OH)₂ conjugate for dilute arsenic solution. The co-existing anions such as chloride, carbonate, sulfate and phosphate ions affected little on the removal of arsenic.

収録刊行物

• アジア・太平洋化学工学会議発表論文要旨集

  アジア・太平洋化学工学会議発表論文要旨集 2004 (0), 996-996, 2004

  公益社団法人 化学工学会

キーワード

• arsenic
• adsorption
• cerium
• clay

詳細情報

• CRID: 1390001205731954944
• NII論文ID: 130005053102
• DOI: 10.11491/apcche.2004.0.996.0
• 本文言語コード: en
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可