Estudo da aplicação de pontos quânticos de carbono em cultivos familiares

Abstract

This work proposes a simple way to obtain carbon quantum dots or simply CDs, following a one-step methodology, using a microwave oven, in order to produce carbon nanoparticles with photoluminescence characteristics attributed to their groups functions linked to its structure. The PQCs had sucrose and urea as their main carbon source, for the samples destined as a source of nutrients for plants, and samples added with Sicilian lemon essential oil, with the purpose of offering a pesticidal action to the CDs. The samples were characterized by FT-IR, UV-Vis and Molecular Fluorescence infrared method. The carbon quantum dots added with urea in its composition were tested in a family farm in the region, mainly in the cultivation of crisp lettuce, in addition to germination and growth tests in isolation in different types of crops. The CDs were promising in terms of nutrient delivery and plant development. Carbon quantum dots plus Sicilian lemon essential oil were applied as a biopesticide, benefiting from the presence of one of the main compounds of the oil - limonene, which is attributed to pesticidal action. During the period in which the work was being developed, large volumes of unseasonal rain occurred, making it difficult to study carbon quantum dots in order to repel pests commonly present in the crop, such as the specimen Empoasca Kraemeri, popularly known as “cigarrinha”. However, the methodology applied for the synthesis of CDs, which was microwave-assisted hydrothermal, proved to be efficient in the production of fluorescent particles containing functional groups such as carbonyls, evidenced by molecular fluorescence and spectroscopy in the infrared region.