Synergistic effect of UV–vis and solar photocatalytic ozonation on the degradation of phenol in municipal wastewater

A comparative study

Achisa C. Mecha, Maurice S. Onyango, Aoyi Ochieng, Christoffel J. S. Fourie, Maggy N. B. Momba

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Photocatalysis and ozonation processes have tremendous potential in wastewater treatment. However, photocatalysis is a slow process, and ozonation is highly selective. Combining these processes overcomes these drawbacks. In the present study, metal-ion (Ag, Cu, and Fe)-doped titanium dioxide (TiO2) nanoparticles were employed in photocatalytic ozonation of phenol solutions and secondary municipal wastewater. The concentrations of phenol and dissolved organic carbon (DOC), chemical oxygen demand (COD), and UV absorbance (UV254) were monitored and the data modeled using pseudo-first-order kinetics. Synergy index values between 1.03 and 4.31 were obtained between ozonation and photocatalysis, resulting in faster degradation of organic contaminants using UV–vis and solar photocatalytic ozonation, compared with photocatalysis and ozonation alone. The treated water satisfied South African water treatment standards in terms of COD, phenol, and DOC levels. The use of solar radiation makes the process environmentally benign and less costly and therefore of major significance.
Original languageEnglish
Pages (from-to)116-125
JournalJournal of Catalysis
Volume341
DOIs
Publication statusPublished - 2016

Fingerprint

Ozonization
Phenol
phenols
Phenols
Wastewater
Photocatalysis
degradation
Degradation
water treatment
carbon
Chemical oxygen demand
oxygen
solar radiation
Organic carbon
titanium oxides
contaminants
metal ions
nanoparticles
kinetics
Solar radiation

Cite this

Mecha, Achisa C. ; Onyango, Maurice S. ; Ochieng, Aoyi ; Fourie, Christoffel J. S. ; Momba, Maggy N. B. / Synergistic effect of UV–vis and solar photocatalytic ozonation on the degradation of phenol in municipal wastewater : A comparative study. In: Journal of Catalysis. 2016 ; Vol. 341. pp. 116-125.
@article{4242e20492ce48feb6b2ca3a775900f2,
title = "Synergistic effect of UV–vis and solar photocatalytic ozonation on the degradation of phenol in municipal wastewater: A comparative study",
abstract = "Photocatalysis and ozonation processes have tremendous potential in wastewater treatment. However, photocatalysis is a slow process, and ozonation is highly selective. Combining these processes overcomes these drawbacks. In the present study, metal-ion (Ag, Cu, and Fe)-doped titanium dioxide (TiO2) nanoparticles were employed in photocatalytic ozonation of phenol solutions and secondary municipal wastewater. The concentrations of phenol and dissolved organic carbon (DOC), chemical oxygen demand (COD), and UV absorbance (UV254) were monitored and the data modeled using pseudo-first-order kinetics. Synergy index values between 1.03 and 4.31 were obtained between ozonation and photocatalysis, resulting in faster degradation of organic contaminants using UV–vis and solar photocatalytic ozonation, compared with photocatalysis and ozonation alone. The treated water satisfied South African water treatment standards in terms of COD, phenol, and DOC levels. The use of solar radiation makes the process environmentally benign and less costly and therefore of major significance.",
author = "Mecha, {Achisa C.} and Onyango, {Maurice S.} and Aoyi Ochieng and Fourie, {Christoffel J. S.} and Momba, {Maggy N. B.}",
year = "2016",
doi = "10.1016/j.jcat.2016.06.015",
language = "English",
volume = "341",
pages = "116--125",
journal = "Journal of Catalysis",
issn = "0021-9517",
publisher = "Academic Press Inc.",

}

Synergistic effect of UV–vis and solar photocatalytic ozonation on the degradation of phenol in municipal wastewater : A comparative study. / Mecha, Achisa C.; Onyango, Maurice S.; Ochieng, Aoyi; Fourie, Christoffel J. S.; Momba, Maggy N. B.

In: Journal of Catalysis, Vol. 341, 2016, p. 116-125.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Synergistic effect of UV–vis and solar photocatalytic ozonation on the degradation of phenol in municipal wastewater

T2 - A comparative study

AU - Mecha, Achisa C.

AU - Onyango, Maurice S.

AU - Ochieng, Aoyi

AU - Fourie, Christoffel J. S.

AU - Momba, Maggy N. B.

PY - 2016

Y1 - 2016

N2 - Photocatalysis and ozonation processes have tremendous potential in wastewater treatment. However, photocatalysis is a slow process, and ozonation is highly selective. Combining these processes overcomes these drawbacks. In the present study, metal-ion (Ag, Cu, and Fe)-doped titanium dioxide (TiO2) nanoparticles were employed in photocatalytic ozonation of phenol solutions and secondary municipal wastewater. The concentrations of phenol and dissolved organic carbon (DOC), chemical oxygen demand (COD), and UV absorbance (UV254) were monitored and the data modeled using pseudo-first-order kinetics. Synergy index values between 1.03 and 4.31 were obtained between ozonation and photocatalysis, resulting in faster degradation of organic contaminants using UV–vis and solar photocatalytic ozonation, compared with photocatalysis and ozonation alone. The treated water satisfied South African water treatment standards in terms of COD, phenol, and DOC levels. The use of solar radiation makes the process environmentally benign and less costly and therefore of major significance.

AB - Photocatalysis and ozonation processes have tremendous potential in wastewater treatment. However, photocatalysis is a slow process, and ozonation is highly selective. Combining these processes overcomes these drawbacks. In the present study, metal-ion (Ag, Cu, and Fe)-doped titanium dioxide (TiO2) nanoparticles were employed in photocatalytic ozonation of phenol solutions and secondary municipal wastewater. The concentrations of phenol and dissolved organic carbon (DOC), chemical oxygen demand (COD), and UV absorbance (UV254) were monitored and the data modeled using pseudo-first-order kinetics. Synergy index values between 1.03 and 4.31 were obtained between ozonation and photocatalysis, resulting in faster degradation of organic contaminants using UV–vis and solar photocatalytic ozonation, compared with photocatalysis and ozonation alone. The treated water satisfied South African water treatment standards in terms of COD, phenol, and DOC levels. The use of solar radiation makes the process environmentally benign and less costly and therefore of major significance.

U2 - 10.1016/j.jcat.2016.06.015

DO - 10.1016/j.jcat.2016.06.015

M3 - Article

VL - 341

SP - 116

EP - 125

JO - Journal of Catalysis

JF - Journal of Catalysis

SN - 0021-9517

ER -