Abstract
ABSTRACT Photodegradation of ampicillin (AMP) over illuminated Ag2Te/ZnTe was investigated with the influence of physico-chemical attributes of the nano-catalyst. The Ag2Te content was increased in the hybrid catalyst. The photodegradation performance was enhanced due to decrease in the band gap of the catalyst. This was further enhanced by adding Ag2Te to ZnTe quantum dots (QDs). The prepared catalyst was studied using analytic techniques such as X-ray diffraction, ultraviolet-visible spectroscopy, field emission scanning electron microscope and dynamic light scattering. The crystallite sizes are distinguished to be 8.62, 14.45, 17.28 and 21.44 nm for ZnTe QDs, Ag2Te/ZnTe-0, Ag2Te/ZnTe-1 and Ag2Te/ZnTe-2, respectively. The effect of three factors such as pH, nano-catalyst dose and AMP concentration was studied for photodecomposition of AMP. Study of reaction optimisation was performed by using the response surface methodology with Box–Behnken design. High correlation was found for the actual and the predicted amount (R 2 = 0.9907, Adj. R 2 = 0.9787 and Pred.R 2 = 0.9657). Optimisation outcome indicated that the maximum efficiency of photodegradation was found at neutral pH, with nano-catalyst dose of 1.0 g/L and AMP concentration 10 mg/L.
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