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Removing Phosphorus from Aqueous Solutions Using Lanthanum Modified Pine Needles.

Xianze Wang1, Zhongmou Liu1, Jiancong Liu1

  • 1School of Environment, Northeast Normal University, Changchun, China.

Plos One
|December 3, 2015
PubMed
Summary
This summary is machine-generated.

Lanthanum hydroxide (LH) modified pine needles effectively remove phosphorus from water, achieving 85% efficiency at pH 3. This sustainable adsorbent also reduces organic compound release, offering a promising solution for water purification.

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Water Treatment

Background:

  • Phosphorus contamination in aqueous solutions poses environmental risks.
  • Developing efficient and sustainable adsorbents is crucial for water remediation.
  • Pine needles represent an underutilized renewable biomass resource.

Purpose of the Study:

  • To evaluate the efficacy of modified pine needles as an adsorbent for phosphorus removal.
  • To investigate the influence of pH, co-existing anions, and temperature on phosphorus adsorption.
  • To assess the impact of chemical modification on the release of soluble organic compounds.

Main Methods:

  • Batch adsorption experiments were conducted using pine needles modified with alkali-isopropanol (AI) and lanthanum hydroxide (LH).
  • Adsorption efficiency was tested across a range of pH values and in the presence of competing anions (sulfate, nitrate, chloride, carbonate).
  • Intraparticle diffusion modeling and thermodynamic analysis were employed to understand the adsorption mechanism. Total organic carbon (TOC) assays were performed.

Main Results:

  • Lanthanum hydroxide (LH) modified pine needles demonstrated high phosphorus removal efficiency (up to 85% at pH 3), outperforming alkali-isopropanol (AI) treated needles.
  • Effective removal was maintained above 65% for 10 mg/L phosphorus solutions across various pH levels.
  • Carbonate ions showed interfering behavior, while sulfate, nitrate, and chloride had minimal impact. Adsorption was thermodynamically unfavorable but enhanced by increased temperature.
  • Chemical modification significantly reduced soluble organic compound release from 135.6 mg/L to 7.76 mg/L.

Conclusions:

  • Lanthanum hydroxide modified pine needles are a promising, sustainable adsorbent for phosphorus removal from aqueous solutions.
  • The adsorption process is primarily governed by intraparticle diffusion and is influenced by pH and temperature.
  • This modification approach not only enhances phosphorus removal but also improves the environmental profile of the adsorbent by reducing organic leaching.