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Photodegradation of pharmaceutical persistent pollutants using hydroxyapatite-based materials.

E Márquez Brazón1, C Piccirillo2, I S Moreira2

  • 1Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior Biotecnologia, Porto, Portugal; Departamento de Quimica, Escuela de Ciencias, Universidad de Oriente Nucleo Sucre, Cumaná, Venezuela.

Journal of Environmental Management
|August 16, 2016
PubMed
Summary

Hydroxyapatite-based biomaterials effectively degrade pharmaceutical pollutants like diclofenac and fluoxetine. Marine-derived hydroxyapatite-titania composites show excellent photostability and reusability for water purification.

Keywords:
DiclofenacFluoxetineHydroxyapatitePersistent pollutantsPhotocatalysis

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Area of Science:

  • Environmental Science
  • Materials Science
  • Biotechnology

Background:

  • Pharmaceutical persistent pollutants are an environmental threat.
  • Hydroxyapatite (HAp) is a common biomaterial, a major bone constituent.
  • Sustainable HAp derived from marine sources (cod fish bones) were utilized.

Purpose of the Study:

  • To investigate hydroxyapatite-based biomaterials as photocatalysts for micropollutant degradation.
  • To evaluate the efficacy of HAp and HAp-titania composites in degrading diclofenac and fluoxetine.
  • To assess the material's stability and performance in real treated wastewater.

Main Methods:

  • Utilized single-phase HAp and HAp-titania (1 wt% TiO2) composites as UV light photocatalysts.
  • Tested degradation of diclofenac and fluoxetine at varying concentrations.
  • Evaluated photocatalyst performance, photostability, reusability, and mineralization using TOC analysis.

Main Results:

  • HAp-titania composites demonstrated superior performance compared to single-phase HAp.
  • Maximum degradation rates reached 100% for fluoxetine and 92% for diclofenac.
  • The photocatalyst exhibited good photostability and effectiveness in treated wastewater, with high mineralization rates.

Conclusions:

  • Hydroxyapatite-based biomaterials, particularly HAp-titania composites, are effective photocatalysts for persistent pharmaceutical pollutant degradation.
  • The marine-derived HAp-titania material shows promise for sustainable water treatment due to its stability and reusability.
  • Further research into mineralization efficiency is warranted for complete pollutant removal.