Photocatalytic removal of an azo dye from solutions using ZnO and modified ZnO: Benzoic acid azo dye as a model

The effects of azo dyes, a severe water pollution source, on the ecosystem and public health have been widely studied, and more studies were made to remove these dyes from water using chemical, biological, electrochemical and physicochemical methods. This study relies on the photocatalytic degradati...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2022-09, Vol.1088 (1), p.12010
Main Authors: Al-Gubury, Hazim Y, Alrazzak, Nour Abd, Saad, Suad T, Haider, Sara
Format: Article
Language:English
Subjects:
Azo dyes
Benzoic acid
Color removal
Dyes
Electrochemistry
Irradiation
Light irradiation
Naphthalene
para-Aminobenzoic acid
Photocatalysis
photocatalytic degradation
Photodegradation
Pollutant removal
Pollutants
Pollution sources
Public health
Turbidity
Water pollution
Zinc oxide
zinc oxide and zinc oxide-polymer
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Summary:The effects of azo dyes, a severe water pollution source, on the ecosystem and public health have been widely studied, and more studies were made to remove these dyes from water using chemical, biological, electrochemical and physicochemical methods. This study relies on the photocatalytic degradation process as a clean method to clean water from azo dyes. The 4-((2-methyl-1-hydroxy naphthalene-1-yl) diazenyl) benzoic acid azo dye was used as a model dye in this study and prepared from a coupling reaction of p-aminobenzoic acid with 2-methylnaphthol. The photocatalytic degradation of this dye has been carried out using ZnO and modified ZnO. The dye removal was tested at various weights of ZnO and modified ZnO, different concentrations of the dye under constant light irradiation by using a 250 watts UV lamp. The results showed the dye removal by the modified (ZnO) was 92.4%, which is higher than the removal efficiency by the unmodified ZnO (87.51%). In conclusion, the results of this study showed that modified ZnO removes a high percentage of the dyes; therefore, it is recommended to use it to remove other common pollutants in the Iraqi rivers, such as phosphate and turbidity.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/1088/1/012010