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A Study of the Degradation of an Organic Acid Induced by a Photocatalytic Cement-TiO2-W Nanocomposite

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Author Affiliations

  • 1Akwa Ibom State University, Department of Chemistry, Physical and Materials Chemistry Unit, P.M.B 1167, Post Code 532111, Ikot Akpaden, Akwa Ibom State, Nigeria
  • 2Akwa Ibom State University, Department of Chemistry, Physical and Materials Chemistry Unit, P.M.B 1167, Post Code 532111, Ikot Akpaden, Akwa Ibom State, Nigeria
  • 3Akwa Ibom State University, Department of Chemistry, Physical and Materials Chemistry Unit, P.M.B 1167, Post Code 532111, Ikot Akpaden, Akwa Ibom State, Nigeria
  • 4Akwa Ibom State University, Department of Chemistry, Physical and Materials Chemistry Unit, P.M.B 1167, Post Code 532111, Ikot Akpaden, Akwa Ibom State, Nigeria
  • 5Akwa Ibom State University, Department of Chemistry, Physical and Materials Chemistry Unit, P.M.B 1167, Post Code 532111, Ikot Akpaden, Akwa Ibom State, Nigeria
  • 6Akwa Ibom State University, Department of Chemistry, Physical and Materials Chemistry Unit, P.M.B 1167, Post Code 532111, Ikot Akpaden, Akwa Ibom State, Nigeria

Res.J.chem.sci., Volume 16, Issue (1), Pages 18-23, February,18 (2026)

Abstract

The preparation of the cement nanocomposites involved the physical dispersion of TiO2 nanoparticles doped with 1-3 wt. % of tungsten (W) within the cement matrix prior to hydration. From the SEM evaluation, the nanoparticles were in the size range of 18 ± 1.25 nm. These cement nanocomposites were used in inducing the photodegradation of stearic acid, on interaction with UV light rated at 8 W, through absorbance and water contact angle measurements. The percent phodegradation efficiency depended on the amount of the nanoparticles incorporated into the cement nanocomposites. In the absorbance studies, the maximum percent photodegradation efficiency of 91 percent was calculated for the cement-6.67wt.% TiO2-W nanocomposite after exposure to UV light for 2 hours. Lower percentages of the photodegradation efficiency, based on the measured water contact angles, were calculated. A maximum of 84.77% was noted after 6 hours of exposure of the coated cement-6.7wt.% TiO2-W nanocomposite and at this instant, the contact angle was 18.29°±3.96°. The Langmuir-Hinshelwood model was used in evaluating the velocity constants of the photodegradation of the stearic acid. The velocity constants from this model ranged from 0.80–1.36hr-1 for the various cement-TiO2-W nanocomposite used in the experimentations.

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