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Updated: Jul 7, 2026

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method
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Phosphate removal from wastewater using red mud.

Weiwei Huang1, Shaobin Wang, Zhonghua Zhu

  • 1ARC Centre of Excellence for Functional Nanomaterials and Division of Chemical Engineering, The University of Queensland, St Lucia, QLD 4072, Australia.

Journal of Hazardous Materials
|March 4, 2008
PubMed
Summary
This summary is machine-generated.

Red mud, a waste material, effectively removes phosphate from water after acid treatment. HCl-treated red mud shows the highest phosphate adsorption capacity, especially at lower pH and higher temperatures.

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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Published on: July 22, 2019

Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Red mud is a problematic waste from alumina refining.
  • Phosphate pollution in water bodies is a significant environmental concern.
  • Developing efficient adsorbents from waste materials is crucial for sustainable environmental management.

Purpose of the Study:

  • To investigate the potential of treated red mud as an adsorbent for phosphate removal.
  • To evaluate the impact of different treatment methods, pH, and temperature on adsorption efficiency.
  • To understand the adsorption kinetics and isotherms for phosphate removal by red mud.

Main Methods:

  • Red mud was treated using acid and acid-thermal methods.
  • Batch experiments were conducted to study phosphate adsorption.
  • Adsorption capacity was measured under varying pH and temperature conditions.
  • Kinetic and isotherm analyses (Langmuir, Freundlich) were performed.

Main Results:

  • Acid-treated red mud exhibited enhanced surface area and pore volume.
  • HCl-treated red mud demonstrated the highest phosphate adsorption capacity (0.58 mg P/g at pH 5.5, 40°C).
  • Adsorption capacity decreased significantly with increasing pH (0.8 mg P/g at pH 2 to 0.05 mg P/g at pH 10).
  • Adsorption capacity increased by 25% with a temperature rise from 30°C to 40°C.
  • Phosphate adsorption followed parallel first-order kinetics, indicating the presence of H(2)PO(4)(-) and HPO(4)(2-).
  • The Freundlich isotherm model provided a better fit for the adsorption data than the Langmuir model.

Conclusions:

  • Acid-treated red mud, particularly HCl-treated, is a promising and cost-effective adsorbent for phosphate removal.
  • Optimal phosphate removal is achieved at acidic pH and elevated temperatures.
  • The adsorption mechanism is complex, involving multiple phosphorus species and best described by the Freundlich model.