Novel ZnS/Carbon Nanofiber Photocatalyst for Degradation of Rhodamine 6G: Kinetics Tracking of Operational Parameters and Development of a Kinetics Model

Photochemistry and Photobiology
Ali Mehrizad, Parvin Gharbani

Abstract

A novel nanocomposite in the role of photocatalyst was prepared by composition of zinc sulfide (ZnS) nanoparticles with carbon nanofibers (CNFs) and was characterized. The XRD, EDX, and FE-SEM analysis revealed that ZnS is successfully embedded in CNFs matrix. The DRS results indicated that supporting of ZnS by CNFs led to a decrease of the band gap energy. The photocatalytic degradation of a hazardous xanthine dye, Rhodamine 6 G (Rh-6G), by the prepared ZnS/CNFs composite was examined from the kinetics point of view. Nonlinear regression analysis was used to develop a mathematical kinetics model based on the Langmuir-Hinshelwood mechanism, and an empirical equation was obtained for the estimation of apparent pseudo-first-order rate constant (kap ) as a function of operational parameters (viz. initial dye concentration, ZnS/CNFs content, pH, and irradiation intensity). Based on the results, kap increased with an increase ZnS/CNFs content, pH, and UV light intensity, whereas it decreased by increasing the initial Rh-6G concentration. Moreover, a new kinetics model was obtained based on proposed elementary steps to determine kap . In the final stage of the work, intermediate materials produced within photocatalytic degradation of...Continue Reading

References

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May 25, 2013·Environmental Science & Technology·Prathik RoyHuan-Tsung Chang
Jul 9, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Ali Mehrizad, Parvin Gharbani

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Citations

Dec 19, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Qi Luo, Hua Li

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