engleski

Photocatalytic degradation of industrial dye with CeO2 nanocatalyst

Eriochrome black T (EBT) is an azo dye that is extensively used in the textile industry for dyeing of silk, nylon and wool. The decomposition of EBT produces carcinogenic products, while its presence in wastewater dramatically affects the aquatic ecosystem. Azo dyes are resistant to biological treatment, oxidizing agents, heat and light, which makes their removal from wastewater very problematic. Therefore, advanced oxidation processes such as photocatalytic decomposition are often utilized. In this paper, the process of photocatalytic degradation of EBT dye under UV radiation was monitored with nanoparticle copper doped cerium (IV) oxide (CuxCe1-xO2, x = 0, 0.1, 0.2 and 0.3) serving as the photocatalyst. CuxCe1-xO2 samples were prepared by hydrothermal method and analyzed by X-ray diffraction analysis, transmission electron microscopy, energy dispersive X-ray spectroscopy and N2 adsorption- desorption isotherms. Nanoparticles of sizes between 6 and 3.8 nm and specific surfaces of about 200 m2 g-1 were obtained. Photocatalytic tests showed that pure EBT does not degrade without the addition of photocatalysts, while all of the tested photocatalysts follow the adsorption kinetics of pseudo-second order and the photodegradation kinetics of pseudo-first order. The maximum reduction of EBT concentration is achieved with the sample Cu0.1Ce0.9O2.

Ceria ; Photocatalysis ; Eriochrome black T

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