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Related Experiment Video

Updated: Aug 16, 2025

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Efficient NiO/F-TiO2 nanocomposites for 4-chlorophenol photodegradation.

Claudia Castañeda1, Diana Santos1, J Sebastián Hernández1

  • 1Universidad Pedagógica y Tecnológica de Colombia, Escuela de Ciencias Química, Grupo de Catálisis-UPTC, Avenida Central de Norte, Vía Paipa, Boyacá, Tunja, Colombia.

Chemosphere
|December 27, 2022
PubMed
Summary

This study enhanced photocatalytic degradation of 4-chlorophenol using novel NiO/F-TiO2 composites. The optimized 1.0% NiO composite significantly boosted contaminant removal and mineralization efficiency.

Keywords:
4-ChlorophenolDegradationHeterojunctionsNiO/F–TiO(2) semiconductorsPhotocatalysis

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Catalysis

Background:

  • Photocatalytic degradation is crucial for removing persistent organic pollutants like 4-chlorophenol.
  • Titanium dioxide (TiO2) is a widely studied photocatalyst, but its efficiency can be limited by charge carrier recombination.
  • Fluorination and doping are strategies to enhance TiO2 photocatalytic activity.

Purpose of the Study:

  • To synthesize and characterize NiO/F-TiO2 composites for enhanced photocatalytic degradation of 4-chlorophenol.
  • To investigate the effect of NiO content on the photocatalytic performance of F-TiO2.
  • To elucidate the structure-activity relationships governing the enhanced photocatalysis.

Main Methods:

  • F-TiO2 support synthesized via sol-gel in-situ fluorination.
  • NiO/F-TiO2 heterostructures prepared by wet impregnation with varying NiO (0.5-2.0% wt).
  • Extensive characterization using XRF, XRD, N2 physisorption, UV-Vis DRS, FTIR, and XPS.

Main Results:

  • Fluorination of TiO2 generated ≡Ti-F species, reducing charge carrier recombination and increasing photoactivity.
  • NiO/F-TiO2 composites exhibited improved degradation and mineralization of 4-chlorophenol compared to F-TiO2.
  • Optimal photocatalytic performance was achieved with 1.0% wt NiO loading, attributed to larger crystallites, lower band gap, and p-n heterojunctions.

Conclusions:

  • NiO/F-TiO2 composites are effective for the photocatalytic degradation of 4-chlorophenol.
  • Fluorination and NiO doping synergistically enhance TiO2 photocatalytic activity by improving charge separation.
  • 1.0% wt NiO loading represents an optimal composition for efficient photocatalytic treatment.