Incorporation CdS with ZnS as Composite and Using in Photo-Decolorization of Congo Red Dye

Abstract

The aim of this manuscript was to modify the ZnS surface by incorporating with CdS photocatalyst. This manner led to depressing the recombination process and increasing the activity. The X-ray Powder Diffraction (XRD) data were proved that the CdS incorporated with ZnS and formed ZnS-CdS nanocomposite by observing new peaks at 26.92, 28.62, 30.52, and 47.26°. Based on the Atomic Force Microscopy (AFM) analysis and Tauc equation, the particle sizes for all samples were raised with decreased the band gap values. The activation energy for decolorization of Congo red with the using ZnS is found to be more than that value for the using prepared ZnS-CdS composite. The percentage of efficiency was found to be increased with modified the ZnS surface.

Preparation, Characterization and Study of the Photodecolorization of Mixed-Ligand Binuclear Co(II) Complex of Schiff Base by ZnO

“…The negative values of ΔS # for the decolorization of the binuclear Co(II) complex species formed is less random than the reactants. These results have similar behavior with other photo reactions observed by several researchers [25,31,34].…”

“…where Ea is activation energy, k is rate constant, R is gas constant, T is the temperature of reaction and A is a frequency constant. ΔH # and ΔS # were calculated based on the Eyring-Polanyi equation [25,[30][31]…”

“…ΔG # of the photo reaction was calculated using the Gibbs equation (Eq. (9)) based on the fitting results of the Eyring-Polanyi equation [29][30][31].…”

Kinetic Study for Reduced the Toxicity of Textile Dyes (Reactive yellow 14 dye and Reactive green dye) Using UV-A light/ZnO System

“…), h is the Plank constant, R is the gas constant, A is the frequency constant, T is the temperature of the reaction and k B is the Boltzmann constant. Table 2 explain the elevated of temperature caused a fast decolorization of the studied dye, that attitude to increase the velocity for generated of hydroxyl radical [33,36] and indicated to the photoreaction of decolorization of both dyes are endothermic (positive ΔH # ). Furthermore, these photoreactions are less random (negative ΔS # ), non-spontaneous (positive ΔG #…”

“…Figures 11 and 12 represents the increased the temperature under UV-light enhances the photo-decolorization of RY 14 and RG dyes at temperature ranged (288.15 -303.15) K. Based on plotted the Arrhenius equation [30][31][32] (in eq.9) in figure 11, the activation energy (E a ) assigned. Besides, the thermodynamics parameters like ΔH # and ΔS # were estimated by plotting Eyring-Polanyi equation [33,34](in eq.10)in figure 12, and used Gibbs equation(ΔG # ) [35,36] (in eq.11 ).…”