Photodegradation of phenol using TiO2, ZnO and TiO2/ZnO catalysts in an annular reactor

Thabo J. Brooms, Maurice S. Onyango, Aoyi Ochieng

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In recent years the incorporation of ZnO as a semiconductor into other catalysts, for enhancing photodegradation processes, has gained attention. This paper describes the synthesis of a blend of metal oxide (TiO2/ZnO) photocatalyst and subsequent testing of the catalyst for the degradation of phenol in an annular photoreactor. The concentration of phenol before and after degradation was determined using Ultra-Violet-Spectroscopy (UV-Vis). Calcined TiO2/ZnO composite material with a mass loading ratio of 1: 1 exhibited the highest percentage phenol removal compared to the unblended TiO2 and ZnO systems at pH 7.2 and temperature of 25°C. It was shown that about 98% phenol degradation could be achieved at initial phenol concentration of 10; 20 and 50 ppm, except for 100 ppm which gave less than 50% degradation. Thus, TiO2/ZnO blend as photocatalyst can be used for degradation of phenol in water. The pseudo-first order reaction kinetics fitted well the Langmuir-Hinshelwood model in almost all concentration ranges tested.
Original languageEnglish
Pages (from-to)155-160
Number of pages6
JournalJournal of Water Chemistry and Technology
Volume39
Issue number3
DOIs
Publication statusPublished - 2017

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Photodegradation
photodegradation
Phenol
phenol
catalyst
Catalysts
Degradation
degradation
Photocatalysts
reaction kinetics
Ultraviolet spectroscopy
Reaction kinetics
Oxides
reactor
Metals
spectroscopy
Semiconductor materials
Water
Composite materials
Testing

Cite this

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title = "Photodegradation of phenol using TiO2, ZnO and TiO2/ZnO catalysts in an annular reactor",
abstract = "In recent years the incorporation of ZnO as a semiconductor into other catalysts, for enhancing photodegradation processes, has gained attention. This paper describes the synthesis of a blend of metal oxide (TiO2/ZnO) photocatalyst and subsequent testing of the catalyst for the degradation of phenol in an annular photoreactor. The concentration of phenol before and after degradation was determined using Ultra-Violet-Spectroscopy (UV-Vis). Calcined TiO2/ZnO composite material with a mass loading ratio of 1: 1 exhibited the highest percentage phenol removal compared to the unblended TiO2 and ZnO systems at pH 7.2 and temperature of 25°C. It was shown that about 98{\%} phenol degradation could be achieved at initial phenol concentration of 10; 20 and 50 ppm, except for 100 ppm which gave less than 50{\%} degradation. Thus, TiO2/ZnO blend as photocatalyst can be used for degradation of phenol in water. The pseudo-first order reaction kinetics fitted well the Langmuir-Hinshelwood model in almost all concentration ranges tested.",
author = "Brooms, {Thabo J.} and Onyango, {Maurice S.} and Aoyi Ochieng",
year = "2017",
doi = "10.3103/S1063455X1703006",
language = "English",
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}

Photodegradation of phenol using TiO2, ZnO and TiO2/ZnO catalysts in an annular reactor. / Brooms, Thabo J.; Onyango, Maurice S.; Ochieng, Aoyi.

In: Journal of Water Chemistry and Technology, Vol. 39, No. 3, 2017, p. 155-160.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Photodegradation of phenol using TiO2, ZnO and TiO2/ZnO catalysts in an annular reactor

AU - Brooms, Thabo J.

AU - Onyango, Maurice S.

AU - Ochieng, Aoyi

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N2 - In recent years the incorporation of ZnO as a semiconductor into other catalysts, for enhancing photodegradation processes, has gained attention. This paper describes the synthesis of a blend of metal oxide (TiO2/ZnO) photocatalyst and subsequent testing of the catalyst for the degradation of phenol in an annular photoreactor. The concentration of phenol before and after degradation was determined using Ultra-Violet-Spectroscopy (UV-Vis). Calcined TiO2/ZnO composite material with a mass loading ratio of 1: 1 exhibited the highest percentage phenol removal compared to the unblended TiO2 and ZnO systems at pH 7.2 and temperature of 25°C. It was shown that about 98% phenol degradation could be achieved at initial phenol concentration of 10; 20 and 50 ppm, except for 100 ppm which gave less than 50% degradation. Thus, TiO2/ZnO blend as photocatalyst can be used for degradation of phenol in water. The pseudo-first order reaction kinetics fitted well the Langmuir-Hinshelwood model in almost all concentration ranges tested.

AB - In recent years the incorporation of ZnO as a semiconductor into other catalysts, for enhancing photodegradation processes, has gained attention. This paper describes the synthesis of a blend of metal oxide (TiO2/ZnO) photocatalyst and subsequent testing of the catalyst for the degradation of phenol in an annular photoreactor. The concentration of phenol before and after degradation was determined using Ultra-Violet-Spectroscopy (UV-Vis). Calcined TiO2/ZnO composite material with a mass loading ratio of 1: 1 exhibited the highest percentage phenol removal compared to the unblended TiO2 and ZnO systems at pH 7.2 and temperature of 25°C. It was shown that about 98% phenol degradation could be achieved at initial phenol concentration of 10; 20 and 50 ppm, except for 100 ppm which gave less than 50% degradation. Thus, TiO2/ZnO blend as photocatalyst can be used for degradation of phenol in water. The pseudo-first order reaction kinetics fitted well the Langmuir-Hinshelwood model in almost all concentration ranges tested.

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DO - 10.3103/S1063455X1703006

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