Comparative Evaluation of the Photodegradation of Stearic Acid by TiO<sub>2</sub> - Modified Cement Under UV Irradiation Through Water Contact Angle and Absorbance Studies

Aniedi Nyong; Edet Nsi; Joachim Awaka-Ama; Godwin Udo

doi:doi:10.11648/j.am.20200901.11

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Comparative Evaluation of the Photodegradation of Stearic Acid by TiO₂ - Modified Cement Under UV Irradiation Through Water Contact Angle and Absorbance Studies

Aniedi Nyong, Edet Nsi, Joachim Awaka-Ama, Godwin Udo

Published in Advances in Materials (Volume 9, Issue 1)

Received: 22 November 2019 Accepted: 17 December 2019 Published: 23 March 2020

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Abstract

The photodegradation of stearic acid has been studied through evaluation of changes in the contact angles of water and from absorbance measurements. The photodegradation of 0.02 M stearic acid coatings and solutions were initiated by TiO₂ nanoparticles of average size of 9.80 ± 2.92 nm embedded in cements in 1.66 wt.%, 3.33 wt.%, 5.0 wt.% and 6.67 wt.% to generate modified cement composites with photocatalytic capability. It was noted that the photodegradation efficiencies increased with the increase in the weight-percent of TiO₂ present in the modified cement samples. A modified Cassie-Baxter and the Langmuir-Hinselwood models were used to compute the rate constants, based on changes in the contact angles of water and in the concentration of the stearic acid respectively, on exposure to the UV light source. The modified Cassie-Baxter model successfully provided a route to relate the changes in water contact angle to the rate of photodegradation of a hydrophobic, long-chain stearic acid. The values of the rate constant estimated from both models increased with increase in the amount of TiO₂ present in the modified cement samples. However, the rate constant values obtained from the modified Cassie-Baxter model were lower than those obtained from the Langmuir-Hinselwood model. The values of these rate contants were in the range of 0.11-0.50 hr^-1 and 0.78-1.33 hr^-1 as btained from the modified Cassie-Baxter and Langmuir-Hinselwood models respectively. This disparity in the values was attributed to a higher mobility of the charge carriers and free-radicals that induced the photodegradation in liquid medium as compared to the solid medium.

Published in	Advances in Materials (Volume 9, Issue 1)
DOI	10.11648/j.am.20200901.11
Page(s)	1-7
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2020. Published by Science Publishing Group

Keywords

Photodegradation, UV Irradiation, Stearic Acid, Contact Angle, Absorbance

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APA Style

Aniedi Nyong, Edet Nsi, Joachim Awaka-Ama, Godwin Udo. (2020). Comparative Evaluation of the Photodegradation of Stearic Acid by TiO2 - Modified Cement Under UV Irradiation Through Water Contact Angle and Absorbance Studies. Advances in Materials, 9(1), 1-7. https://doi.org/10.11648/j.am.20200901.11

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ACS Style

Aniedi Nyong; Edet Nsi; Joachim Awaka-Ama; Godwin Udo. Comparative Evaluation of the Photodegradation of Stearic Acid by TiO2 - Modified Cement Under UV Irradiation Through Water Contact Angle and Absorbance Studies. Adv. Mater. 2020, 9(1), 1-7. doi: 10.11648/j.am.20200901.11

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AMA Style

Aniedi Nyong, Edet Nsi, Joachim Awaka-Ama, Godwin Udo. Comparative Evaluation of the Photodegradation of Stearic Acid by TiO2 - Modified Cement Under UV Irradiation Through Water Contact Angle and Absorbance Studies. Adv Mater. 2020;9(1):1-7. doi: 10.11648/j.am.20200901.11

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@article{10.11648/j.am.20200901.11,
  author = {Aniedi Nyong and Edet Nsi and Joachim Awaka-Ama and Godwin Udo},
  title = {Comparative Evaluation of the Photodegradation of Stearic Acid by TiO2 - Modified Cement Under UV Irradiation Through Water Contact Angle and Absorbance Studies},
  journal = {Advances in Materials},
  volume = {9},
  number = {1},
  pages = {1-7},
  doi = {10.11648/j.am.20200901.11},
  url = {https://doi.org/10.11648/j.am.20200901.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.am.20200901.11},
  abstract = {The photodegradation of stearic acid has been studied through evaluation of changes in the contact angles of water and from absorbance measurements. The photodegradation of 0.02 M stearic acid coatings and solutions were initiated by TiO2 nanoparticles of average size of 9.80 ± 2.92 nm embedded in cements in 1.66 wt.%, 3.33 wt.%, 5.0 wt.% and 6.67 wt.% to generate modified cement composites with photocatalytic capability. It was noted that the photodegradation efficiencies increased with the increase in the weight-percent of TiO2 present in the modified cement samples. A modified Cassie-Baxter and the Langmuir-Hinselwood models were used to compute the rate constants, based on changes in the contact angles of water and in the concentration of the stearic acid respectively, on exposure to the UV light source. The modified Cassie-Baxter model successfully provided a route to relate the changes in water contact angle to the rate of photodegradation of a hydrophobic, long-chain stearic acid. The values of the rate constant estimated from both models increased with increase in the amount of TiO2 present in the modified cement samples. However, the rate constant values obtained from the modified Cassie-Baxter model were lower than those obtained from the Langmuir-Hinselwood model. The values of these rate contants were in the range of 0.11-0.50 hr-1 and 0.78-1.33 hr-1 as btained from the modified Cassie-Baxter and Langmuir-Hinselwood models respectively. This disparity in the values was attributed to a higher mobility of the charge carriers and free-radicals that induced the photodegradation in liquid medium as compared to the solid medium.},
 year = {2020}
}

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TY  - JOUR
T1  - Comparative Evaluation of the Photodegradation of Stearic Acid by TiO2 - Modified Cement Under UV Irradiation Through Water Contact Angle and Absorbance Studies
AU  - Aniedi Nyong
AU  - Edet Nsi
AU  - Joachim Awaka-Ama
AU  - Godwin Udo
Y1  - 2020/03/23
PY  - 2020
N1  - https://doi.org/10.11648/j.am.20200901.11
DO  - 10.11648/j.am.20200901.11
T2  - Advances in Materials
JF  - Advances in Materials
JO  - Advances in Materials
SP  - 1
EP  - 7
PB  - Science Publishing Group
SN  - 2327-252X
UR  - https://doi.org/10.11648/j.am.20200901.11
AB  - The photodegradation of stearic acid has been studied through evaluation of changes in the contact angles of water and from absorbance measurements. The photodegradation of 0.02 M stearic acid coatings and solutions were initiated by TiO2 nanoparticles of average size of 9.80 ± 2.92 nm embedded in cements in 1.66 wt.%, 3.33 wt.%, 5.0 wt.% and 6.67 wt.% to generate modified cement composites with photocatalytic capability. It was noted that the photodegradation efficiencies increased with the increase in the weight-percent of TiO2 present in the modified cement samples. A modified Cassie-Baxter and the Langmuir-Hinselwood models were used to compute the rate constants, based on changes in the contact angles of water and in the concentration of the stearic acid respectively, on exposure to the UV light source. The modified Cassie-Baxter model successfully provided a route to relate the changes in water contact angle to the rate of photodegradation of a hydrophobic, long-chain stearic acid. The values of the rate constant estimated from both models increased with increase in the amount of TiO2 present in the modified cement samples. However, the rate constant values obtained from the modified Cassie-Baxter model were lower than those obtained from the Langmuir-Hinselwood model. The values of these rate contants were in the range of 0.11-0.50 hr-1 and 0.78-1.33 hr-1 as btained from the modified Cassie-Baxter and Langmuir-Hinselwood models respectively. This disparity in the values was attributed to a higher mobility of the charge carriers and free-radicals that induced the photodegradation in liquid medium as compared to the solid medium.
VL  - 9
IS  - 1
ER  -

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Author Information

Aniedi Nyong

Materials Chemistry Research Unit, Department of Chemistry, Faculty of Physical Sciences, Akwa Ibom State University, Akwa Ibom State, Nigeria
Edet Nsi

Materials Chemistry Research Unit, Department of Chemistry, Faculty of Physical Sciences, Akwa Ibom State University, Akwa Ibom State, Nigeria
Joachim Awaka-Ama

Materials Chemistry Research Unit, Department of Chemistry, Faculty of Physical Sciences, Akwa Ibom State University, Akwa Ibom State, Nigeria
Godwin Udo

Materials Chemistry Research Unit, Department of Chemistry, Faculty of Physical Sciences, Akwa Ibom State University, Akwa Ibom State, Nigeria

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Aniedi Nyong, Edet Nsi, Joachim Awaka-Ama, Godwin Udo. (2020). Comparative Evaluation of the Photodegradation of Stearic Acid by TiO2 - Modified Cement Under UV Irradiation Through Water Contact Angle and Absorbance Studies. Advances in Materials, 9(1), 1-7. https://doi.org/10.11648/j.am.20200901.11

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ACS Style

Aniedi Nyong; Edet Nsi; Joachim Awaka-Ama; Godwin Udo. Comparative Evaluation of the Photodegradation of Stearic Acid by TiO2 - Modified Cement Under UV Irradiation Through Water Contact Angle and Absorbance Studies. Adv. Mater. 2020, 9(1), 1-7. doi: 10.11648/j.am.20200901.11

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AMA Style

Aniedi Nyong, Edet Nsi, Joachim Awaka-Ama, Godwin Udo. Comparative Evaluation of the Photodegradation of Stearic Acid by TiO2 - Modified Cement Under UV Irradiation Through Water Contact Angle and Absorbance Studies. Adv Mater. 2020;9(1):1-7. doi: 10.11648/j.am.20200901.11

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@article{10.11648/j.am.20200901.11,
  author = {Aniedi Nyong and Edet Nsi and Joachim Awaka-Ama and Godwin Udo},
  title = {Comparative Evaluation of the Photodegradation of Stearic Acid by TiO2 - Modified Cement Under UV Irradiation Through Water Contact Angle and Absorbance Studies},
  journal = {Advances in Materials},
  volume = {9},
  number = {1},
  pages = {1-7},
  doi = {10.11648/j.am.20200901.11},
  url = {https://doi.org/10.11648/j.am.20200901.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.am.20200901.11},
  abstract = {The photodegradation of stearic acid has been studied through evaluation of changes in the contact angles of water and from absorbance measurements. The photodegradation of 0.02 M stearic acid coatings and solutions were initiated by TiO2 nanoparticles of average size of 9.80 ± 2.92 nm embedded in cements in 1.66 wt.%, 3.33 wt.%, 5.0 wt.% and 6.67 wt.% to generate modified cement composites with photocatalytic capability. It was noted that the photodegradation efficiencies increased with the increase in the weight-percent of TiO2 present in the modified cement samples. A modified Cassie-Baxter and the Langmuir-Hinselwood models were used to compute the rate constants, based on changes in the contact angles of water and in the concentration of the stearic acid respectively, on exposure to the UV light source. The modified Cassie-Baxter model successfully provided a route to relate the changes in water contact angle to the rate of photodegradation of a hydrophobic, long-chain stearic acid. The values of the rate constant estimated from both models increased with increase in the amount of TiO2 present in the modified cement samples. However, the rate constant values obtained from the modified Cassie-Baxter model were lower than those obtained from the Langmuir-Hinselwood model. The values of these rate contants were in the range of 0.11-0.50 hr-1 and 0.78-1.33 hr-1 as btained from the modified Cassie-Baxter and Langmuir-Hinselwood models respectively. This disparity in the values was attributed to a higher mobility of the charge carriers and free-radicals that induced the photodegradation in liquid medium as compared to the solid medium.},
 year = {2020}
}

Copy | Download

TY  - JOUR
T1  - Comparative Evaluation of the Photodegradation of Stearic Acid by TiO2 - Modified Cement Under UV Irradiation Through Water Contact Angle and Absorbance Studies
AU  - Aniedi Nyong
AU  - Edet Nsi
AU  - Joachim Awaka-Ama
AU  - Godwin Udo
Y1  - 2020/03/23
PY  - 2020
N1  - https://doi.org/10.11648/j.am.20200901.11
DO  - 10.11648/j.am.20200901.11
T2  - Advances in Materials
JF  - Advances in Materials
JO  - Advances in Materials
SP  - 1
EP  - 7
PB  - Science Publishing Group
SN  - 2327-252X
UR  - https://doi.org/10.11648/j.am.20200901.11
AB  - The photodegradation of stearic acid has been studied through evaluation of changes in the contact angles of water and from absorbance measurements. The photodegradation of 0.02 M stearic acid coatings and solutions were initiated by TiO2 nanoparticles of average size of 9.80 ± 2.92 nm embedded in cements in 1.66 wt.%, 3.33 wt.%, 5.0 wt.% and 6.67 wt.% to generate modified cement composites with photocatalytic capability. It was noted that the photodegradation efficiencies increased with the increase in the weight-percent of TiO2 present in the modified cement samples. A modified Cassie-Baxter and the Langmuir-Hinselwood models were used to compute the rate constants, based on changes in the contact angles of water and in the concentration of the stearic acid respectively, on exposure to the UV light source. The modified Cassie-Baxter model successfully provided a route to relate the changes in water contact angle to the rate of photodegradation of a hydrophobic, long-chain stearic acid. The values of the rate constant estimated from both models increased with increase in the amount of TiO2 present in the modified cement samples. However, the rate constant values obtained from the modified Cassie-Baxter model were lower than those obtained from the Langmuir-Hinselwood model. The values of these rate contants were in the range of 0.11-0.50 hr-1 and 0.78-1.33 hr-1 as btained from the modified Cassie-Baxter and Langmuir-Hinselwood models respectively. This disparity in the values was attributed to a higher mobility of the charge carriers and free-radicals that induced the photodegradation in liquid medium as compared to the solid medium.
VL  - 9
IS  - 1
ER  -

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