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The Interactions Between Three Typical PPCPs and LDH.

Erwei Li1, Libing Liao1, Guocheng Lv1

  • 1Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, China.

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|March 21, 2018
PubMed
Summary
This summary is machine-generated.

Layered double hydroxide (LDH) effectively removes tetracycline (TC) and diclofenac sodium (DF) from water. Adsorption mechanisms vary, with Cl-LDH showing no interaction with chloramphenicol (CAP).

Keywords:
Cl-LDHPPCPsadsorptionanion exchangeelectrostatic interaction

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemistry

Background:

  • Layered double hydroxides (LDHs) are promising for anionic contaminant remediation.
  • Pharmaceuticals and personal care products (PPCPs) are emerging environmental contaminants.

Purpose of the Study:

  • Investigate the adsorption of tetracycline (TC), diclofenac sodium (DF), and chloramphenicol (CAP) by Cl-type Mg-Al hydrotalcite (Cl-LDH).
  • Elucidate the adsorption mechanisms and capacities of Cl-LDH for selected PPCPs.

Main Methods:

  • Co-precipitation synthesis of Cl-LDH.
  • Batch adsorption experiments.
  • Characterization using XRD, Zeta potential, DLS, BET, FTIR.
  • Molecular dynamics simulations.

Main Results:

  • Cl-LDH achieved adsorption equilibrium for TC and DF within 120 min.
  • Maximum adsorption capacities: 1.85 mmol/g for TC (Freundlich model) and 0.95 mmol/g for DF (Langmuir model).
  • Adsorption kinetics followed a pseudo-second-order model for TC and DF.
  • TC adsorption involved electrostatic interactions; DF adsorption involved anion exchange and electrostatic interactions; CAP was not adsorbed due to lack of electrostatic interaction.

Conclusions:

  • Cl-LDH demonstrates selective adsorption capabilities for PPCPs based on their chemical properties and interactions.
  • Molecular dynamics simulations confirmed the distinct adsorption behaviors of TC, DF, and CAP on Cl-LDH.
  • LDH materials show potential for targeted removal of specific anionic contaminants from water.