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Research Article
Lotfi Khezami
Al Imam Mohammad Ibn Saud University
Corresponding Author
ORCiD: https://orcid.org/0000-0001-5747-3114
License:
This work is licensed under a CC BY 4.0 License. Read Full License
This work aims to investigate the effect of copper doping on the photocatalysis performance of TiO2 nanoparticles for disposal wastewater from organic pollutants. X-ray diffraction analysis manifests the crystallization of a rutile phase for pure and copper-doped TiO2 except for 2% resulting in a rutile-to-anatase phase transformation. The crystallite size is found less affected by Cu doping; i.e. ~30 nm. BET analysis indicates a decrease in the specific surface area as the doping loading increases. Scanning electron microscopy observations reveal spherical particles at the nanometer range for pure TiO2 then larger agglomerates of ultrafine particles with Cu doping. FTIR analysis notifies the existence of hydroxyl groups that will promote the photocatalysis process. The photodegradation of Azucryl Red (AR) has been investigated under different conditions; i.e., Cu-loading, initial concentration of AR, and pH. The kinetics of the photodegradation process is further found to comply with the Lagergren kinetic law, regardless the experimental conditions. Nevertheless, the photodegradation process is not only controlled by the intra-particle diffusion mechanism, but also by mass transfer through a liquid film boundary. The maximum degradation of AR, i.e. 86%, has been achieved at pH = 5.0 during 60 minutes of contact time for the 2% Cu-doping, with effective regeneration. The Freundlich model exhibits a better fitting for AR dye photodegradation equilibrium data, compared to Langmuir, Temkin and Dubinin-Radushkevich.
Keywords
Sol-gel, Cu-doping, Rutile, Anatase, Phase transformation, Photodegradation, Azucryl red
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CURRENT STATUS: Under Review
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Posted 11 Mar, 2021
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Reviews received
Received 08 Mar, 2021
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This preprint is under consideration at Environmental Science and Pollution Research. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Lotfi Khezami
Al Imam Mohammad Ibn Saud University
Corresponding Author
ORCiD: https://orcid.org/0000-0001-5747-3114
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 1
Posted 11 Mar, 2021
No community comments so far
Reviews received
Received 08 Mar, 2021
Reviewers invited
Invitations sent on 08 Mar, 2021
Editor invited
On 02 Mar, 2021
Editor assigned
On 22 Feb, 2021
First submitted
On 17 Feb, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
This work aims to investigate the effect of copper doping on the photocatalysis performance of TiO2 nanoparticles for disposal wastewater from organic pollutants. X-ray diffraction analysis manifests the crystallization of a rutile phase for pure and copper-doped TiO2 except for 2% resulting in a rutile-to-anatase phase transformation. The crystallite size is found less affected by Cu doping; i.e. ~30 nm. BET analysis indicates a decrease in the specific surface area as the doping loading increases. Scanning electron microscopy observations reveal spherical particles at the nanometer range for pure TiO2 then larger agglomerates of ultrafine particles with Cu doping. FTIR analysis notifies the existence of hydroxyl groups that will promote the photocatalysis process. The photodegradation of Azucryl Red (AR) has been investigated under different conditions; i.e., Cu-loading, initial concentration of AR, and pH. The kinetics of the photodegradation process is further found to comply with the Lagergren kinetic law, regardless the experimental conditions. Nevertheless, the photodegradation process is not only controlled by the intra-particle diffusion mechanism, but also by mass transfer through a liquid film boundary. The maximum degradation of AR, i.e. 86%, has been achieved at pH = 5.0 during 60 minutes of contact time for the 2% Cu-doping, with effective regeneration. The Freundlich model exhibits a better fitting for AR dye photodegradation equilibrium data, compared to Langmuir, Temkin and Dubinin-Radushkevich.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
The full text of this article is available to read as a PDF.
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