Ultra-fast Photocatalytic Degradation of the Azo Dyes using Au/ZnO Nanocomposites | [Journal of Pakistan Institute of Chemical Engineers • 2024]

Author(s):

1. S.S. Hassan: US.-Pakistan Center for Advanced Studies in Water (USPCASW), Mehran University of Engineering and Technology, Jamshoro, 76062, Sindh, Pakistan

2. A. Majeed: US.-Pakistan Center for Advanced Studies in Water (USPCASW), Mehran University of Engineering and Technology, Jamshoro, 76062, Sindh, Pakistan

3. M.Y. Talpur: Dr. M. A. Kazi Institute of Chemistry, University of Sindh, Jamshoro, 76080, Sindh, Pakistan

4. A.R. Sidhu: Dr. M. A. Kazi Institute of Chemistry, University of Sindh, Jamshoro, 76080, Sindh, Pakistan

5. F. Durmaz: Department of Chemistry, Selcuk University, Konya 42075, Turkey

Abstract:

Water resource scarcity is increasing day by day, so effective treatment of wastewater is needed to grow water availability and the economy. Many wastewater treatment technologies have been developed, but nanomaterial sciences also play a vital role. So, in this study, a gold chloride zinc oxide (Au/ZnO) nanocomposite catalyst was synthesized using the chemical precipitation method. The degradation studies used methyl orange, eriochrome black tea, and bromocresol green as model dyes and textile industry wastewater. The nanocomposite was also characterized by various techniques such as FTIR, XRD, TEM, and Ultraviolet-visible spectrophotometer. The results represent that the FTIR spectrum of nanocomposites shows six-well peaks at different values, which signifies that N-H stretching primary amine, N-H stretching amine salt, O-H bending carboxylic acid, and C-I stretching are present in the nanocomposites structure. X-ray diffraction results show eight well-defined peaks at 2-theta, indicating the existence of a hexagonal-phase ZnO structure with Au. The transmission electron microscopy results show that Au is highly spread with a small size and uniform morphology over the surface of the ZnO. The UV-visible absorption spectra of nanocomposite samples showed a distinct band center around 350-400 nm. The concentration of 0.5 mL of 1.0 M sodium borohydride, methyl orange, eriochrome black tea, and bromocresolgreen, and five mg of the nanocomposite used in degradation studies, and the result was analyzed with the help of a UV-visible spectrophotometer. The average time of complete degradation was from five minutes to nine minutes. It was noticed that the prepared Au/ZnO nanocomposite is very effective and eco-friendly for the degradation of dyes and wastewater.

Page(s): 1-10

DOI: 10.54693/piche.05221

Published: Journal: Journal of Pakistan Institute of Chemical Engineers, Volume: 52, Issue: 2, Year: 2024

Keywords:

Degradation , methyl orange , Photocatalytic , bromocresol green , AuZnO Nanocomposites , Eriochrome Black T , Organic Azo Dyes

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