hrvatski

Removal of acetamiprid over TiO2/perlite photocatalyst

The large-scale use of pesticides in agriculture and veterinary medicine has led to their widespread occurrence in the natural aquatic environment. Since they are difficult to remove from the aquatic medium by conventional treatment techniques, advanced oxidation processes focusing on heterogeneous photocatalysis are preferred [1]. In this work, the photocatalytic degradation of the neonicotinoid insecticide acetamiprid was studied in a batch reactor using TiO2-based "floating" photocatalysts under UVA - LED irradiation. All experiments were performed with the same stirring rate, catalyst mass and solution pH. The effect of irradiation intensity via the change of source voltage (31, 31.5 and 32 V), initial acetamiprid concentration (5, 10 and 15 ppm) and catalyst type on the degradation efficiency was investigated. Before conducting the experiments, an experimental design was prepared using the software package Design-Expert [2]. The degree of acetamiprid photodegradation was determined by measuring the change in its concentration during the reaction using high performance liquid chromatography. The obtained experimental data were also tested with a kinetic model for the pseudo-first order reaction. The experimental results showed that the irradiation intensity has the greatest influence on the reaction rate and efficiency of the photocatalytic degradation of acetamiprid. The reaction rate and conversion increase with increasing irradiance, as does the reaction rate constant.

fotokataliza ; acetamiprid ; TiO2/perlit fotokatalizator

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