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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Bioavailability Enhancement: Drug Permeability Enhancement

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Body:After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt...
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Related Experiment Video

Updated: Dec 31, 2025

Preparation of Polypentafluorophenyl acrylate Functionalized SiO2 Beads for Protein Purification
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Function integrated chitosan-based beads with throughout sorption sites and inherent diffusion network for efficient

Yumeng Zhao1, Lin Guo1, Wei Shen1

  • 1Faculty of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, PR China.

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|January 1, 2020
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Summary

A novel lanthanum-chitosan composite with polydopamine coating (La-CS@PDA) effectively removes phosphate from wastewater. This cost-effective adsorbent shows high capacity and selectivity, even with competing ions present.

Keywords:
ChitosanLanthanumPhosphate removalPolydopamineSorption

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Phosphate pollution in wastewater poses significant environmental risks.
  • Existing phosphate removal methods often face challenges with cost-effectiveness and efficiency.
  • Development of novel adsorbents is crucial for sustainable wastewater treatment.

Purpose of the Study:

  • To fabricate a novel, cost-effective, and biomass-derived adsorbent for efficient phosphate removal.
  • To investigate the adsorption capacity, selectivity, and mechanism of the developed adsorbent.
  • To evaluate the adsorbent's performance under conditions simulating industrial applications.

Main Methods:

  • Fabrication of lanthanum-chitosan hydrogel coated with polydopamine (La-CS@PDA).
  • Phosphate adsorption experiments using batch and continuous flow systems.
  • Analysis of adsorption isotherms (Langmuir) and kinetics (Thomas model).
  • Evaluation of adsorbent selectivity in the presence of competitive anions.

Main Results:

  • The La-CS@PDA adsorbent demonstrated a maximal adsorption capacity of 195.3 mg/g for phosphate.
  • The material exhibited excellent selectivity for phosphate over common anions like Cl-, SO42-, and NO3-.
  • Adsorption data fitted well with the Langmuir isotherm and Thomas model, indicating favorable adsorption and suitability for continuous processes.
  • The adsorbent possesses good mechanical strength and is easily separable.

Conclusions:

  • The developed La-CS@PDA adsorbent is a highly efficient and selective material for phosphate removal from wastewater.
  • Its cost-effectiveness, biomass origin, and robust performance make it a promising candidate for dephosphorization applications.
  • The study highlights the potential of composite hydrogels for addressing water pollution challenges.