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Study of the participation of the polymer chitosan presence of the insecticide spinosad in porous media under dynamic and static conditions

Goutouli Georgia-Iro

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Summary

Throughout time, the effects on the environment from human intervention have been a major concern for the scientific community. The use of scientific wisdom combined with modern technology has led to the adoption of new methods of dealing with pollution, particularly in surface and groundwater from urban and industrial waste. However, a new problem, which has become more acute in recent years, is adding to the already accumulated environmental problems. Dehydration. It is therefore imperative that science should focus on the treatment of waste water in order to enable it to enrich the aquifer, with the aim of improving the water balance.Pesticides, with their widespread and often indiscriminate use in agricultural crops, are discharged into surface and groundwater and pollute it. Research and study of the findings in order to address the pollution of the aquifer by pesticides is one of the priorities in addressing water pollution. The method used to clean up water from pesticide pollutants is adsorption.In this paper, the application of the polymer Chitosan and its interaction with the insecticide Spinosad, whose use is widespread in agricultural crops, is studied.The factors that led to the choice of Chitosan are its extended use, its physicochemical characteristics, adsorption capacity, efficacy and affordability. The insecticide Spinosad was chosen because of its extended applications in agriculture, since it is used in the control of many insect pests (fruit fly, flea beetle, green worm, needleworm, etc.). The adsorption process is used to reduce or remove toxic pollutants from the soil and water environment, so that the water is clean, treated and safe for the aquifer.First, the interaction of Chitosan and Spinosad was studied through three series of experiments. In the first two series, the adsorptive capacity of the polymer towards the pesticide was studied by performing intermittent work (batch) experiments in static and dynamic. The difference between the two series is the presence of quartz sand in the second series, which as the most common mineral of the earth's surface was used as a soil simulator. A range of parameters was studied including three Spinosad concentration values (100 mg/L, 50 mg/L, 25 mg/L), three pH values (7, 9, 4) and three ionic strength values (1mM, 50mM, 100mM). All experiments were performed using vials at 25°C while keeping the concentration of Chitosan constant. In the third set of experiments, the transport of Chitosan and Spinosad through a sand column saturated with water and the effect of sand on the adsorption process were studied. The participation of the two compounds together and each of them separately were both studied.The experimental results were processed using the ColloidFit program, where the results were simulated to a large extent by means of pseudo-second order kinetics, which proves that chemical sorption (chemosorption) predominated in the experiments.

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