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Separate As(V) from solution by mesoporous Y-Al binary oxide: batch experiments.

Hang Liu1, Caiyun Han1, Liu Yang1

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Water Science and Technology : a Journal of the International Association on Water Pollution Research
|March 1, 2018
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Summary
This summary is machine-generated.

New Y-Al binary oxides effectively remove toxic arsenic(V) from water. The optimal adsorbent, with a Y/Al molar ratio of 0.058, demonstrates a high adsorption capacity of 60.93 mg/g.

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemistry

Background:

  • Arsenic(V) is a high-priority water pollutant requiring efficient removal methods.
  • Mesoporous materials offer promising adsorption properties for water remediation.

Purpose of the Study:

  • To synthesize and evaluate novel Y-Al binary oxides as adsorbents for arsenic(V) removal from water.
  • To optimize the Y/Al molar ratio and investigate adsorption performance under various conditions.

Main Methods:

  • Mesoporous Y-Al binary oxides were prepared using the wet impregnation method.
  • Adsorbent characterization included N2 adsorption-desorption, point of zero charge (PZC), and FT-IR.
  • Batch experiments were conducted to assess the effects of Y/Al ratio, adsorbent dosage, contact time, initial concentration, pH, and temperature.

Main Results:

  • The optimal Y/Al molar ratio for arsenic(V) adsorption was determined to be 0.058.
  • Maximum adsorption capacity reached 60.93 mg/g at pH 6.6 ± 0.1, fitting the Langmuir isotherm model.
  • Adsorption kinetics followed a pseudo-second-order model, indicating endothermic and spontaneous adsorption.

Conclusions:

  • Y-Al binary oxides are effective adsorbents for arsenic(V) removal.
  • Ion-exchange and electrostatic interactions are the primary mechanisms governing arsenic(V) adsorption.
  • The developed materials show potential for practical application in water purification.