Removal mechanisms of arsenite by coprecipitation with ferrihydrite

Yutaro Takaya, Masakazu Kadokura, Tatsuya Kato, Chiharu Tokoro*


研究成果: Article査読

19 被引用数 (Scopus)


Arsenic contamination of groundwater is a serious issue in many countries. We investigated the removal mechanism of arsenite (As(III)) through coprecipitation with ferrihydrite to establish an optimum wastewater treatment method. We conducted adsorption and coprecipitation experiments with different As/Fe molar ratios to identify the differences between the adsorption and coprecipitation processes. Precipitates from these experiments were analyzed by using X-ray diffraction and X-ray absorption fine structure analysis to determine local structural changes of ferrihydrite during coprecipitation. As(III) removal via coprecipitation with ferrihydrite was caused by surface complexation at a lower initial As/Fe molar ratio (< 1.0). Surface complexation and amplification of the octahedral structure of the ferrihydrite were the removal mechanisms at higher initial As/Fe molar ratios (> 1.0). Our results contribute to developing a more efficient wastewater treatment method for As(III) removal.

ジャーナルJournal of Environmental Chemical Engineering
出版ステータスPublished - 2021 10月

ASJC Scopus subject areas

  • 化学工学(その他)
  • 廃棄物管理と処理
  • 汚染
  • プロセス化学およびプロセス工学


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