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<p>A new in situ-formed ferric-aluminum (hydr)oxides adsorbent (in situ Fe-Al) used as a functional adsorbent for arsenic (As(V)) was prepared from red mud (RM). The adsorbent, characterized by XRD, BET, and SEM-EDS, was determined to be amorphous with a large specific surface area and well-developed pore structure. The effects of factors and coexisting anions on the As(V) adsorption were also investigated. Under optimal conditions, the As(V) removal rate exceeded 99%, and the As(V) concentration in the adsorbed liquid was less than 0.1&#xa0;mg/g. Adsorption thermodynamic and kinetics investigation indicated that the As(V) adsorption was dominated by physisorption and controlled by coupled external and internal diffusion from the Weber–Morris model. The adsorption mechanism was dominated by electrostatic interactions caused by positively charged groups, supplemented by hydroxide ion (OH<sup>−</sup>) exchange and inner-sphere complexation. Adsorbent regeneration was achieved using a NaOH-10 % NaCl binary solution (pH = 11), but the regeneration process led to slight and slow damage to the adsorbent.</p>

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A New In Situ-Formed Ferric-Aluminum (Hydr)Oxides Prepared by Red Mud for Arsenic Removal

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Haonan Liu,
  • Xincun Tang,
  • Zanlang Tang,
  • Zeyu Xiao

摘要

A new in situ-formed ferric-aluminum (hydr)oxides adsorbent (in situ Fe-Al) used as a functional adsorbent for arsenic (As(V)) was prepared from red mud (RM). The adsorbent, characterized by XRD, BET, and SEM-EDS, was determined to be amorphous with a large specific surface area and well-developed pore structure. The effects of factors and coexisting anions on the As(V) adsorption were also investigated. Under optimal conditions, the As(V) removal rate exceeded 99%, and the As(V) concentration in the adsorbed liquid was less than 0.1 mg/g. Adsorption thermodynamic and kinetics investigation indicated that the As(V) adsorption was dominated by physisorption and controlled by coupled external and internal diffusion from the Weber–Morris model. The adsorption mechanism was dominated by electrostatic interactions caused by positively charged groups, supplemented by hydroxide ion (OH−) exchange and inner-sphere complexation. Adsorbent regeneration was achieved using a NaOH-10 % NaCl binary solution (pH = 11), but the regeneration process led to slight and slow damage to the adsorbent.