AVALIAÇÃO DA LIBERAÇÃO CONTROLADA E DEGRADAÇÃO DA ATRAZINA EM MICROESFERAS DE ALGINATO DE SÓDIO

Abstract

As a result of the population increase, the search for expansion of the cultivated area is immediate, requiring adequate pest management, highlighting weed control. The combat of these weeds is linked to the speed at which the agrochemical acts on plants, standing out among the treatments, the chemical, that use herbicides capable of acting on the central system of the plant inhibiting its photosynthesis. Through technological innovation, controlled release methods have been adopted, so that they can be applied and developed in industrial scale meeting the agricultural production demand, therefore, microspheres of sodium alginate and microcomposite of sodium alginate/atrazine/TiO2 were synthesized for anchoring atrazine and assessing controlled release and its degradation. The release and sorption kinetics were evaluated for a period of seventy-one days, being monitored by ultraviolet–visible spectrophotometry (UV-vis). In the controlled release study, the maximum release occurred in the eighth cycle on the fourth day and in the sorption was noted that the cycle with the best performance was the first cycle with a sorption of 65.5%. The photolysis and photocatalysis process in the presence of TiO2 were effective in pH 7, with emphasis that in the presence of the catalyst, the degradation showed greater performance with removal of 79.1% of the total atrazine.