Abstract
CuO/ZnO nanocomposites were greenly prepared and tested for the catalytic degradation of methyl orange. The XRD analysis confirmed the existence of CuO and ZnO with crystallite sizes within the range of 15–30 nm. TEM and SEM images showed different morphological properties. The TGA analysis revealed a good thermal stability of the nanocomposite, with a total loss of less than 18% at a temperature of 700 °C. The nanocomposites were tested for the catalytic degradation of methyl orange under mild conditions with a catalyst mass/wastewater volume of 10 g/3 L, an initial dye concentration of 40 ppm, a pH of 4.5, and a degradation time of 3 h. The best efficiency of 49.1% was achieved by CuO nanoparticles (C), followed by 47.6%, which was obtained by 1C1Z. The degradation efficiency of ZnO (Z) was 16.4%, and it was increased by increasing the CuO precursor in the synthesis mixture, while adding ZnO to the CuO, resulting in a decrease in its catalytic performance.
Highlights
With increasing human activities, higher levels of contamination are emerging, especially water contamination
It is very difficult to eliminate them and they tend to accumulate [2]. These dyes are classified as highly toxic, chromatic, and carcinogenic. They are very harmful to aquatic life, since they affect the light absorbance by the water bodies, which in turn affects all of the biological degradation occurring with the aid of light and causes oxygen imbalance in the aquatic system [1,3]
The ANE spectrum contains more than five peaks, indicating that it is not a simple chemical, and it has some common peaks with the nanocomposites
Summary
Higher levels of contamination are emerging, especially water contamination. Organic dyes, such as methyl orange, are considered the main risk factor, due to their complex structure. Most of these dyes are highly water-soluble and non-biodegradable. It is very difficult to eliminate them and they tend to accumulate [2] These dyes are classified as highly toxic, chromatic, and carcinogenic. They are very harmful to aquatic life, since they affect the light absorbance by the water bodies, which in turn affects all of the biological degradation occurring with the aid of light and causes oxygen imbalance in the aquatic system [1,3]
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