Optimization of Oxy Tetracycline Aqueous Solutions Removal by Nano Zero Valent Iron in Oxidation and Photo-oxidation Processes

Document Type : Research Article

Authors

Civil & Environment Engineering Faculty, Tarbiat Modares University, P.O. Box 14115-111 Tehran, I.R. IRAN

Abstract

Antibiotic formulation waste water effluents are well known for their hard elimination by traditional bio-treatment methods and their important contribution to environmental pollution due to their fluctuating and recalcitrant nature. In the present study, interactions effect of oxy tetracycline (OTC) with Nano Zero Valent Iron (NZVI) modified by UV-A radiation were investigated using batch experiments with the parameters such as reactant concentration, pH, UV power, nano-iron concentration and time. In this process the UV power was 200 W and after six and half hours, 155 ppm OTC aqueous solutions by 1000 ppm nano-iron powder at pH of 3 were degraded. The removal efficiency of absorption (290 and 348 nm), TOC and COD were 87, 95, 85 and 89 percent, respectively. In the similar process there was no organic compound after 14 hours. The XRD analysis, has detected FeO and FeOOH, as the layer oxides that have formed on the surface of nano zero valent iron particles. The positive effects of this layer on the photocatalytic removal process were studied by blank experiments. The blank experiments were aerated by UV irradiation, and oxidized by iron nano particles in dark conditions that have been compared separately with the results of hybrid process (Iron nano particles in the presence of UV radiation). These experiments have shown superior results for OTC removal in hybrid process.

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References

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